Annual report 1972

Netherlands Ship Model Basin Wageningen the Netherlands The Netherlands Ship Model Basin is located in Wageningen, Haagsteeg 2 P.O.Box 28, Telephone: (08370) 19140 Telex: 45148 Telegrams: Modeltank Bankers: Algemene Bank Nederland N.V., Wageningen, Account: 53.93.39.156.

The Depressurized Towing Tank is located in Ede, Niels Bohrstraat, Telephone: (08380) 19115 Corïii:Hii;iii:: •

Board of Directors, IVIanagement, Advisory Board, Con= 1 sultants. Representatives

•3 GerK=!i'ail

Industrial Service Deep water towing tank Cavitation tunnels and special projects 5 Strength and vibrations Depressurized towing tank 10 Propulsion hydrodynamics 11 Seakeeping basin Wave and current basin Shallow water basin 16 Manoeuvring simulator 18 Computer centre 18 General 18 Development of service programs 18 Service to industry 20 Research

Instrumentation 21

Cooperation with other organizations 22

23 Personnel

Publications, lectures, meetings 24

32 Prospects

Some important figures 34 Facilities in Wageningen 35 Events in 1972 Organization scheme and principal personnel of the NSMB 36 Amount of orders from the Netherlands, foreign countries and NSMB research 37 Distribution of orders from foreign countries in percentage 38

Board of Directors, Management, Advisory Board, Consultants, Representatives

Board of Directors (Dutch) J. W. Hupkes Chairman Shipbuilder (retd.) Dr H. J. H. Janssen Vice-Chairman Under-Secretary of State for Shipping P. de Josselin de Jong Secretary Shipowner (retd.) Prof. H. E. Jaeger IVIembers Naval Architect (retd.) R. J. H. Fortuyn Floyal Netherlands Shipowners Association P. E. E. Kleyn van Willigen Shipowner 0. J. van der Vorm Central Association of Dutch Shipbuilders 0.W. Vos Ministry of Finance

IVIanagement President Prof, dr J. D. van Manen Vice-Presidents A. H. Pastoor, Registeraccountant (Administration) Dr J. P. Hooft (Ship Dynamics - Offshore Technology) J.J. Muntjewerf (Ship Powering) Dr M. W. C. Oosterveld (/Research and Development)

Advisory Board Members W. C. den Hartog Shipbuilder (Dutch) A. Laredo Shipbuilder (French) J. F. Meijer Royal Netherlands Navy G. Nilsson Shipbuilder (Swedish) H. M. Oudshoorn Ministry of Transport, Hydraulics and Public Works (Dutch) E. M. O. Roren Det norske Veritas (Norwegian) L. P. Ruys Shipowner (Dutch) M. C. van Veen Shipbuilder (Dutch) 1 Prof. W. Vinke University of Tecfinology, Delft (Dutch)

Consultants (Dutch) Prof. J. Gerritsma University of Technology, Delft Prof, dr W. P. A. van Lammeren Netherlands Ship Model Basin, Wageningen (retd.) Prof, dr R. Timman University of Technology, Delft Prof, dr R. Wereldsma University of Technology, Delft

Representatives Antelope Engineering Pty., Ltd., Milson's Point, N.S.W. Australia J. E. Bowker & Associates Inc., Boston U.S.A. and Canada Mr Blakely Smith, Houston U.S.A., Gulf area MacGregor Far East Ltd., Tokyo Japan Nafsi S.A., Piraeus Greece

2 General

On June 9, H. R. H. Prince Glaus of the Netherlands inaugurated the depres­ surized towing tank in Ede.

On March 22, prof, dr W. P. A. van Lammeren retired from his office as president after a period of 42 years of active service. He was succeeded by prof, dr J. D. van Manen, who joined the staff of the NSMB in 1948.

The 40th anniversary of the NSMB was celebrated from August 29 - September 1. A great number of international experts assisted in the organization of the symposium by submitting outstanding technical papers. The papers in the mean­ time have been compiled in a jubilee book.

In November Mr D. Rodenburg, secretary, and dr H. H. Mooij retired from their membership of the Board of Directors after 7, respectively 8 years of active service,

Mr P. de Josselin de Jong accepted an appointment as secretary of the Board.

Mr P. E. E. Kleyn van Willigen, Mr R. J. H. Fortuyn, the latter official represen­ tative of the Royal Netherlands Shipowners Association, and Mr 0. J. van der Vorm, official representative ofthe Central Association of Dutch Shipbuilders were nominated as new members.

Her Majesty the Queen awarded the Chairman of the Board of Directors, Mr J. W. Hupkes, with the 'De Ruyter'-medal in gold in recognition and ap­ praisal of his activities forthe NSMB in the past 21 years. The medal was handed over on September 27 by the Secretary of State, Ministry of Transport, Hydraulics and Public Works, dr. R. J. H. Kruisinga, who stressed the importance of this mark of honour, which was created in 1907, 300 years after the birth of Admiral Michiel Adriaanszoon de Ruyter and is given to persons who have distinguished themselves by deserving achievements for Netherlands shipping.

On May 9, the Advisory Board was installed by the chairman ofthe Board of Directors, Mr J. W. Hupkes. The Advisory Board will assist the Board of Directors and the Management in appraising new ideas and developments of scientific industrial service in marine technology. For this reason the Advisory Board is composed of authorities from the shipbuilding, shipping and offshore industry, navy and university. The Advisory Board met twice in 1972. The discussions promise a new technical communication between industry and the NSMB management.

A satisfying number of industrial orders was received during the year, main­ taining the 'self-supporting' basis of the institute.

The large number of advanced projects under process at the end of 1972 pro­ mises stable growth and continuity for the near future.

The table on page 33 gives some figures on the distribution of the turnover of the different facilities since 1968, as percentages of the total turnover. The graphs on pages 37 and 38 give an impression of where the orders originated from. Industrial Service

Deep water towing tank

This facility was, as in previous years, fully occupied during the whole of 1972 with industrial orders. The work was carried out in two full shifts.

The tendency already evident in foregoing years for a gradually increasing de­ mand for more complicated electronical measuring devices is continuing partly due to the nature of the tests to be performed, partly due to automation With regard to the latter, a first step has been made by recording the 5-hole Pitot tube wake surveys on magnetic tape. The results are calculated and plotted immediately by a computer. The instru­ mentation for the determination of the wave resistance by means of wave-cut analysis has been completed and the necessary software is ready for routine use.

Besides the large number of normal resistance and propulsion tests some re­ search work, sponsored by the Netherlands Ship Research Centre TNO, has also been carried out. Investigations with regard to the vibration and propulsive performance of a contra-rotating propeller arrangement as an alternative propulsion device for a third generation containership have been completed. Open water tests with two geosim propeller models for an LNG tanker model have been conducted at a series of different Reynolds numbers to investigate the scale effect on propeller characteristics. Laminary flow effects have been observed for Reynolds numbers below 1.5 x IQS. For this project also measurements have been started to study the wake and the boundary layer flow with hot-film anemo­ meters. As could be expected, initial difficulties had to be overcome, which is normal with these advanced measuring devices. Boundary layer thickness measurements can now be conducted satisfactorily. Finally a start has been made to investigate fundamentally the effect of ventilation on the resistance of flat plates.

4 Cavitation tunnels and special projects

As in previous years, the cavitation tunnel with flow regulator has been used mainly for cavitation observation tests with propeller models. In this tunnel the axial wake flow in the propeller plane can be simulated ac­ curately by means of a flow regulator consisting of a multiple of channels with valves system. The amount of orders for this tunnel showed a slight increase with regard to the preceding year.

In the large cavitation tunnel most tests consisted of cavitation tests with pro­ peller models and pressure fluctuation measurements on built-in ship after­ bodies. The wake flow (axial, tangential and radial components) is simulated by the ship afterbody itself. In the beginning a standard forebody made of steel was used for fixing the afterbody model. This way of simulating the wake flow proved to be unsatisfactory. Later on, complete dummy models were built in, which showed a satisfactory simulation of the wake flow.

In the high speed cavitation tunnel a research program was carried out to es­ tablish the effect of polymers on cavitation. Polymer solutions were injected from the nose of a cylindrical body made of stainless steei or Teflon. A definite reduction of both incipient and desinent cavitation was found for the stainless steel body, whereas a slight reduction was found for the Teflon body. The experiments provided valuable information on the origin of cavitation. Strength and vibrations

By means of the finite element computer program DASH, developed at the NSMB, the vibration level at service speed, as generated by the complete pro- peMer excitation system (hull pressure forces and dynamic propeller shaft forces and moments), has been calculated at several locations on a ship (thrustblock foundation, rudder stock, top deck of deckhouse). Good agreement with full scale measurements have been achieved.

For transverse shaft vibrations it has been found that the oilfilm in the bearings plays a very important role (stiffness and damping). The research on this subject TvientT cooperation with the University of Technology,

Measurements of propeller induced pressure fluctuations on a dummy ship model m the large cavitation tunnel have shown to give good qualitative information with regard to the hydrodynamic hull excitation for most ships. For quantitative information the reproduction of the wake field is generally too difficult due to the restricted tunnel dimensions. Measurements in the depressurized towing tank, however, will result in accurate predictions of excitation forces on the full scale

As a result of the fact that the dynamic behaviour of cavitation has shown a large magnification effect on the hull pressure fluctuations, it was assumed that re­ ducing the inhomogeneities of the wake field in the upper part of the propeller disc would lead to a considerable reduction of the pressure fluctuations For various ships a tunnel-like structure, just above the propeller and starting on the hull at some propeller diameters distance in front of the propeller has been successfully recommended resulting in substantial reductions of full scale hull vibrations.

Important progress has been made in developing an instrument for measuring the total propeller induced fluctuating force on the afterbody. Some orientating tests led to promising results.

6 7 Depressurized towing tank

The very first trials of this totally new facility proved that the conception, design and technology have been correct. The pressure control of the tank and speed control of the carriage created no problems of significance. The vacuum can be maintained at less than 33 mm Hg, using only a fraction of the available pumping power. This means that models up to a scale of 1 :30 can be tested under realistic cavitation conditions. The speed of the carriage, which is computer controlled, can be kept within a tolerance of 1/000 of the required speed in the range of 0.8 to 4 m/sec. The force between the carriage and model can therefore be measured very accurate­ ly, even with an 18 tons model.

Some problems conceming the reliability of the equipment under depressurized conditions were successfully solved.

The completely computerized measuring system is operational. The results can be reproduced within very narrow limits and indicate an interesting influence of cavitation on the interaction between ship and propeller.

The cavitation phenomena on the propeller can be clearly observed through both periscopes. Special light beams have been fitted to obtain an acceptable light distribution over the propeller.

There is a world wide interest in the results of tests under cavitating conditions. Reliable measurements were obtained towards the end of the year. It is therefore possible that a better analysis of propeller behaviour and its effects on the hull will be achieved.

A new equipment for the measurement of pressure fluctuations on the hull will become operational during 1973 together with equipment for measuring un­ steady forces and moments on the shaft. The measuring equipment has a capa­ city of up to 32,000 samples per second.

8 Cavitation on propeller blades of ship model in depressurized towing tank.j Propulsion hydrodynamics

This recently formed department takes care of guiding and developing major theoretical work in the field of propulsion hydrodynamics. It is located in the offices of the depressurized towing tank in Ede.

In the past year analytical work has mainly been concentrated on the hydro- dynamical phenomena which influence the action of the propeller. This work has resulted in the further development of the linearized unsteady lifting surface theory and in the development of a quasi-steady theory for the calculation of cavitation on propellers. In addition, the cross-fairing of the Wageningen B- screw series was continued and a start was made in the preparation of a revised set of open-water and 'Bp-delta' diagrams.

The numerical unsteady lifting surface program can now, with success, be ap­ plied to the determination of unsteady propeller loads and vibratory hydro- dynamical propeller characteristics. The quasi-steady cavitation analysis program IS primarily used for the analysis of propeller performance and propeller design. The results of a large number of experimental projects were analysed and inter­ preted by means of these theories.

Attention is now being focussed on the influence of the Reynolds number on nominal wake, on propeller - wake induction effects and on propeller - hull mteraction phenomena inclusive of the influence of cavitation. In connection With the latter subject, work has recently been started on the development of a theory for the calculation of the vibratory hull pressures and forces induced by cavitating propellers.

Finally, together with other departments, an experimental program has been started to assess the various devices available for measuring wake field velocities, The devices under consideration are the 5-hole and Prandtl Pitot-tube, the hot- film anemometer and the laser-doppler velocity meter.

10 Seakeeping basin

The large amount of industrial orders again made it necessary to carry out the experiments in this facility in double work-shifts.

More than 50 per cent of the work consisted of rendering service to the offshore- industry, characterized by a large diversity of the problems to be solved, parti­ cularly in connection with the exploration and exploitation of minerals in unpro­ tected waters of increasing depths.

Existing theories and computer programs proved indispensable to estimate in first instance the phenomena that can be expected. A remarkable tendency to substitute the traditional seakeeping experiments by model studies into local phenomena for maritime structures, platforms as well as surface ships became evident.

Apart from the investigations in the industrial sector, also some general research programs were completed, for example an investigation into the behaviour and the sustained sea speed in the scope of the development of a fourth generation container carrier.

11 Wave and current basin

Compared with 1971, the wave and current basin was well provided with orders during the year under review. Of the available time, 90 per cent was used for industrial orders. Studies to deter­ mine the behaviour of moored or anchored vessels accounted for 50 per cent of the work. For 75 per cent of these studies emphasis was laid on the design of the mooring systems and the dimensioning of the mooring equipment. For the remaining 25 per cent of these studies, the dynamic motion behaviour and the forces in the construction constituted the most important aspects of the tests. These tests were carried out with such vessels as pipe-laying barges and dredgers.

Determination of the manoeuvring characteristics of ships, partly in order to be able to judge new ship designs, partly in order to obtain information to be used for the design of new waterways represented about 20 per cent of the orders.

The reversed spiral technique was successfully introduced as a standard proce­ dure to evaluate the dynamical course stability of ships.

Of the remaining orders the introductory investigation into the stability of the piers of the Hook of Holland harbour should be especially mentioned. This order was carried out for the Ministry of Transport, Hydraulics and Public Works under supervision of the Delft Hydraulics Laboratory.

As a result of the satisfactory number of orders in hand at the end of the year, the prospects for the coming year seem to be promising.

12

Shallow water basin

The less favourable order situation during 1971 continued for the first half of the year. This period of slackness created a possibility for fundamental research by our institute. The following research programs were carried out: - captive model tests to determine the hydrodynamic coefficients of a 200 000 TDW tanker in loaded and ballast condition in deep water, in behalf of the ma­ noeuvring simulator; - oscillator tests to determine the influence of the water depth on the hydro- dynamic coefficients of a tanker for motions in the horizontal plane • - measurements of wave forces on two neighbouring cylinders and on a pyra­ mid to check the results of the computer program for the calculation of the wave forces on bodies of arbitrary shape, the completion of which was reported in the preceding annual report; - a start was made with systematic open water tests with controllable pitch propellers in nozzles.

During the second half year the tank was fully occupied again with commercial work. The turnover was composed as follows: percentage manoeuvring tests 15 tests in waves and oscillator tests 50 resistance and launching tests 25 theoretical calculations io

The prospects for the next year are good.

14 Propulsion test with sternwheel riverboat model shallow water basin. Manoeuvring simulator

The number and variety of activities on the manoeuvring simulator showed a sharp mcrease during the year. In the beginning of the year training courses in manoeuvring large tankers were conducted successfully for companies, which became regular clients for such courses. During the second half of the year various research projects were carried out besides the manoeuvring courses These projects included a program to establish the width and shape of an ap­ proach channel to a proposed harbour, a program to evaluate different steering systems for large tankers and several programs for the evaluation of navigational aids. During one of the latter an attempt was made to measure the stresses ex­ perienced by persons navigating with these aids under various conditions. To carry out all these programs the simulator had to be operated in two shifts.

The development of software for the simulation of new types of ships, different, tankers on shallow and deep water, and a container ship, required considerable effort and time for which the staff had to be extended.

The analysis of the results of the research programs contributed to the under­ standing of how similar programs could be optimized and in which way further analysis can be refined.

The projection system of the simulator was improved to enable simulation of manoeuvres close to coasts and in harbour entrances. A radar simulator from Redifon, having all advantages of ship borne radar (true motion, anti-collision etc.) will be installed in the beginning of 1973.

It is believed that the experience and knowledge gained during this year con­ stituted a solid base for work to be carried out in the future.

16 Manoeuvring simulator- Measurement of physical reactions of ship officer navigating under difficult conditions.

ANALYSIS

COWIPUTER

REGISTRATION

Manoeuvring simulator - In­ vestigation into observational behaviour of officer on the bridge of a VLCC

17 Computer centre

General

Since tfie CDC 3300 configuration has reached its full capacity during 1972 it was decided to purchase a PDP 11/45 computer system, equipped with, among other thmgs, a visual display. This system will be especially devoted to the pro- cessmg of laboratory recordings and will be used as a batch terminal on a CDC 6600 computer.

The drawing capabilities of the computer centre were considerably increased by the mstallation of the KV 1890 drawing system, officially put into production on September 27. The drawing table has a net drawing area of 9.00 x i.80 m. The new system has shown increased speed, reliability and drawing possibilities.

Important was the streamlining of the software management. The different soft­ ware groups were brought under one management. This will facilitate the diffi­ cult task of integrating the software activities, which, by nature, are spread over many departments of the NSMB.

Development of service programs

Design programs New ideas and principles for a software package of design programs useful for different demands from clients were studied this year and some parametric stu­ dies were carried out with the already existing tanker design program.

Shipyard production programs Much effort was put into streamlining and further development of the NALS- programs used for the computer assisted preparation of papertapes for numeri­ cally controlled flamecutting and drawing machines. New programs for section supports and for templates for the bending process of shell plates have been developed. Specifications for these programs were ob­ tained from an inquiry among the Dutch shipyards. The development of a new program for the fairing of ships lines, necessary to be able to handle almost every possible ship form, has been started and will be ready for production at the end of 1973. Constant upgrading of the existing computer programs is necessary to cope with the ever increasing complexity of shipforms on one hand and the extremely short delivery times asked for on the other hand.

Service to industry

The three categories of NSMB computer programs available to the shipping and shipbuilding industry, viz.: 1 preliminary design programs; 2 programs supporting ship production at the yards, and 3 those making calculations not necessarily needed during the actual steel- erection process, 18 were intensively used during this year.

The decision, early in 1972, of Centraalstaal (Conoship group) to use the NALS- system (Numerical control Adapted Language for Shipbuilding) for the N/C equipment installed in their centralized steel preparation-shop has been followed by quite a few Dutch shipyards that make use of the large papertape controlled KV 1890 drawing machine of our institute.

The quality of the templates for shell plates produced by the drawing machine was so promising that several ship-yards decided to use the NALS geometry- describing language also for the internal plates of the ship structure.

As an obvious extension of our services to the industry the possibilities of terminal connections to the NSMB-computer are being studied. A market- analysis has been initiated for that purpose.

Coding courses were given for the part programmers of the shipyards as well as introductory courses for their staffs.

Computer centre - KV 1890 numerical controlled drawing table with net drawing area of 9 X 1,8 m.

19 Research

Research was continued on the recently found effects of cavitation on the vibra­ tory forces acting at the stern of the ship. Therefore, as already mentioned under different headings in the previous chapter, much effort has been devoted in the past year for the development of : - means for the determination of the wake field and the analysis of wake fields • - a propeller design method which includes the peripheral inequality of the wake in the design process; - unsteady lifting surface theory for the determination of the propeller induced shaft forces. This theory will be extended to determine also the unsteady hull forces and to include the effect of cavitation in this theory; - finite element methods including the effect of shear stresses and hydrody­ namic mass, damping and coupling in hull vibration analysis.

The means and methods mentioned above were components in the research projects carried out for the Cooperative Research Program, the Netherlands Ship Research Centre TNO and the Royal Netherlands Navy.

At this moment 2 Dutch companies and 13 foreign companies, including 3 clas­ sification societies, participate together with our institute in the Cooperative Research and Development of Large Tankers. The investigations concentrate on performance and cavitation, sealoads, propeller generated hull and shaft vibra­ tions and manoeuvring of large tankers.

Much attention has also been given in the past year to the hydrodynamic aspects of semi-submersible platforms and underwater storage tanks. The theoretical methods for the calculation of the wave-excited forces on these constructions have been improved. A finite element method has been developed in combina­ tion with the sealoads program which enables strength calculations for semi- submersible platforms, underwater storage tanks and other constructions used for the exploration and exploitation of the seabottom.

Extensive model tests have been carried out during the past year to determine the hydrodynamic characteristics of large tankers sailing in shallow waters. These data are of utmost importance for studies to be performed at the manoeuvring simulator.

20 Instrumentation

The instrumentation for the depressurized towing tank was designed and in­ stalled by this department. Quite some time was used to adjust the several systems. An active filter was installed to reduce the relative accelerations between model and carriage. This filter also serves as a protection of the resistance pick-up in the model against the very large starting and stopping forces.

Much time was also spent throughout the year to improve the quality, the quantity and the variety of the measuring equipment of the facilities in Wage­ ningen.

In 1 972 a study was carried out to find a solution for the improvement of the recording of the data and the data reduction. The study, carried out with other departments, resulted in a new concept with the following advantages: great accuracy, more channels and the possibility of a faster data reduction. The new set-up makes use of small PDP 11 /10 computer configurations on the carriages and a large PDP 11 /45 system for the data reduction. The first con­ figuration will be installed at the beginning of 1974.

Considerable time was spent on the design of a radar installation for the ma­ noeuvring simulator. Cooperation with other organizations

A regular communication with national and foreign institutions and organiza­ tions in the field of marine technology was maintained.

A great number of authorities visited the new facilities of NSMB and dis­ cussed problems of mutual interest.

Four members of NSMB have been selected in committees ofthe International Towing Tank Conference: Prof. dr. J. D. van Manen Advisory council Dr. M. W. C. Oosterveld Propeller committee J. J. Muntjewerf Performance committee M. F. van Sluijs Seakeeping committee P. van Oossanen Cavitation committee

f ^';'''°P^^".Conference on Marine Technology is planned in The Hague tor May 1974. This conference is a joint activity of the Royal Institution of Naval Architects, Institute of Marine Engineers, Association Technique Maritime et Aeronautique, Schiffbautechnische Gesellschaft and Koninklijk Instituut van Ingenieurs (Section Marine Technology). Prof. dr. J. D. van Manen has been elected as chairman of the executive committee.

Dr. J. P. Hooft became a member of Panel H-10 (ship controllability) of the Society of Naval Architects and Marine Engineers.

The cooperation with the Delft Hydraulics Laboratory, consisting of exchange of management information has developed fruitfully.

Continuous contacts were maintained with the Dutch Universities of Techno- ^^I'Z Netherlands Navy, The Netherlands Ship Research Centre TNO and The Maritime Research Centre.

22 No. Title Author Published in

393a Wetenschappelijke dienst­ J. D. van Manen Schip en Werf, 1972, verlening aan scheeps­ p. 368 Catalogus voor bouw en scheepvaart de Scheepvaart, 4de editie 1972-1973, p. 106 Polytechnisch Tijd­ schrift, editie Werk­ tuigbouw, 1972, p. 802 and 834 393a Toegepast wetenschappe­ J. D. van Manen Nautisch Technisch Tijdschrift De Zee, lijk onderzoek ten dienste 1972, p. 158 and 190 van scheepsbouw en scheepvaart 397* The effect of cavitation on J. D. van Manen ISP, 1972, p. 3 the interaction between propeller and ship's hull 398* Cavitation on hemispheri­ J. H. J. van der ISP, 1972, p. 333 cal nosed teflon bodies Meulen 399 Incipient and desinent J. H. J. van der ISP, 1972, p. 21 cavitation on hemispheri­ Meulen cal nosed bodies 400 Hydrodynamic aspects of J. P. Hooft NSMB, Wageningen, semi-submersible plat­ 1972 (Doctor's thesis) forms 405* The effect of cargo hand­ A. Koops Europort '71 Congress ling on ship operation Amsterdam, 'Nether­ economics lands Day' (1972) 406* Influence of N/C produc­ A. W. Ruys Europort '71 Congress tion on shipyard organiza­ Amsterdam, 'Nether­ tion lands Day' (1972) 407* Note on mutual influence Tan Seng Gie Europort '71 Congress between transverse stabil­ Amsterdam, 'Nether­ ity and roll motion lands Day' (1972) 408* Motion minimization of M. F. van Sluijs Europort '71 Congress semi-submersible barges Amsterdam, 'Nether- 'lands Day (1972) 409 Ship research activities in M. W. C. Oosterveld ISP, 1972, p. 213 the Netherlands and P. van Oossanen 410 Netherlands Ship Model NSMB, Wageningen, Basin 1972 411 * Thruster systems for im­ M. W. C. Oosterveld Fourth Annual Off­ proving the maneuverabil­ and G.van shore Technology ity and positionkeeping Oortmerssen Conference, Houston, capability of floating ob­ Texas, 1972, Vol. II, jects p. 87

25 No. Title Author Published in

412* Motion optimization of H. L. Minkenberg Fourth Annual Off­ semi-submersibles and shore Technology M. F. van Sluijs Conference, Houston, Texas, 1972, vol. II, p. 131 413 Het berekenen en tekenen H. Konijnenberg Schip en Werf, 1972, van huidplaatuitslagen met p. 349 het computerprogramma 'SHELL', ontwikkeld door het Rekencentrum van het Nederlands Scheepsbouwkundig Proefstation 414* The ship as an integrated J. D. van Manen Symp. 'Development system in Merchant Ship­ building', Design - Production - Manage­ ment, Delft, 1972, Paper No. 1 415* Application of network A. W. Ruys Symp. 'Development analysis to the allocation in Merchant Ship­ of capacity and to project building', Design - cost control Production - Manage­ ment, Delft, 1972, Paper No. 14 418* Cavitation testing of P. van Oossanen Schip en Werf, 1972, marine propellers p. 286 and 309 420* Het Nederlandsch J. J. Muntjewerf De Ingenieur, 1972, Scheepsbouwkundig p. A574 Proefstation te Wageningen 421 On the use of a ma­ I. Oldenkamp and Schiff und Hafen, noeuvring simulator J. P. Hooft 1972, p. 561 422* Hydrodynamics of the re­ M. W. C. Oosterveld Symp. on 'The Devel­ stricted draught tanker and J. P. Hooft opment of a 425,000 TDW Tanker with Re­ stricted Draught', Wageningen, 1971, p. 17 (1972) 423* The drifting force on J. H. G. Verhagen Eighth Symp. on Naval a floating body in Hydrodynamics, Pasa­ irregular waves dena, California, 1970, p. 955 (1972) 424* Application of the ramjet W. van Gent Proc. Symp. on Jet principle to hydrodynamic Pumps and Ejectors, propulsion London, 1972, p. 65

26 Audience Date Subject Author

August 30 - Recent develop­ M. W. C. Oosterveld September 1 ments in marine and propeller hydrody­ P. van Oossanen namics

Cavitation and its J. H. J. van der detrimental Meulen effects

Retrospection on M. F. van Sluijs 15 years NSMB and seakeeping activi­ Tan Seng Gie ties

Ocean technology J. P. Hooft

Design and opera­ J. Holtrop and tions A. Koops U.S. Coast Guard October 28 Manoeuvring large J. P. Hooft ships in shallow Academy at New water London, Connecticut November 1 5 Recent develop­ J. D. Manen U.S. Coast Guard ments of scientific Academy at New industrial services London, at the NSMB Connecticut November 21 The choice of pro­ P. van Oossanen Hydromechanics peller design para­ Colloquium at meters with respect Bethesda, Mary­ to cavitation con­ land, organized by trol Naval Ship Re­ search and Devel­ opment Center

29 The following meetings were attended in 1972

larch 13 ITTC Propeller Committee at Feltham J. D. van Manen larch 15 Symposium 'Modern ship structural J. D. van Manen, design philosophy' at Delft, orga­ A. W. Ruys and nized by 'Sectie voor Scheepstech­ Tan Seng Gie niek van het Koninklijk Instituut van Ingenieurs' April 11-13 ITTC Performance Committee in J. J. Muntjewerf London April 12-14 Spring Meetings of the Royal Institu­ J. J. Muntjewerf, tion of Naval Architects in London J. van der Kooy, and Haslar P. van Oossanen and M. F. van Sluijs May 1-3 Fourth Annual Offshore Technology G. van Oortmerssen Conference at Houston, Texas, spon­ and M. F. van Sluijs sored by the American Institute of Mining, Metallurgical, and Petrole­ um Engineers et al. May 16-18 SPE - European Spring Meeting in M. F. van Sluijs Amsterdam, organized by the Nether­ lands Section of the Society of Pe­ troleum Engineers (SPE) ofthe American Institute of Mining, Metal­ lurgical, and Petroleum Engineers (AIME) May 26 North Sea Towing Tank Conference J. D. van Manen at St. Albans May 30-June 2 Symposium 'Development in Merchant J. D. van Manen and Shipbuilding', Design - Production - A.W. Ruys Management at Delft, organized by the Sub-department of Naval Archi­ tecture of the Delft University of Technology August 20-25 Ninth Symposium on Naval Hydro­ J. D. van Manen, dynamics in Paris, under the joint M. W. C. Oosterveld sponsorship of Office of Naval Re­ and search, Direction Technique des G. van Oortmerssen Constructions Navales, Direction des Recherches et Moyen d'Essais, and Association Technique Maritime et Aéronautique

3Q August 29- International Jubilee Meeting on the J. D. van Manen, September 1 Occasion of the 40th Anniversary of J. P. Hooft, the Netherlands Ship Model Basin J. J. Muntjewerf, in The Hague and Delft M. W. C. Oosterveld, J. Holtrop, A. Koops J. H.J.van der Meulen, P. van Oossanen, M. F. van Sluijs and Tan Seng Gie September 4-14 13th International Towing Tank Con­ J. D. van Manen and ference in Berlin and Hamburg J. J. Muntjewerf G. D. Draaijer and September 22 Symposium 'Ontwerpen met de computer' at Eindhoven, underthe J. Holtrop auspices of 'Afdeling voor Technisch Wetenschappelijk Onderzoek van het Koninklijk Instituut van Ingenieurs en het Nederlands Rekenmachine Genootschap' September 26-28 Third Ship Control Systems Sympo­ J. P. Hooft sium at Bath, organized by the Ship Department of the United Kingdom Ministry of Defence November 1 Symposium on Jet Pumps and Ejec­ W. van Gent tors in London, sponsored and or­ ganized by BHRA Fluid Engineering (The British Hydromechanics Re­ search Association) in conjunction with the Institution of Chemical Engineers November 16-17 Eightienth Annual Meeting of the So­ J. D. van Manen ciety of Naval Architects and Marine M. W. C. Oosterveld Engineers in New York and P. van Oossanen G. van Oortmerssen, November 17 Europort '72 Congress, 'Offshore Day' in Amsterdam, under the aus­ G. F. M. Remery and pices of the Division for Underwater M. F. van Sluijs Technology of the Royal Institution of Engineers in the Netherlands December 7-8 ITTC Performance Committee in J. J. Muntjewerf Paris

31 Prospects

The prospects for 1973 can be considered promising. The increase of work since the middle of 1972 and the good distribution of orders over the various departments has continued in the first quarter of 1973.

A limited extension of the staff will be necessary in view of the amount of work In hand and the further prospects for 1973. Much attention, however, will also be given to a further mechanization or auto­ mation of activities.

Wageningen, April 1973

32 Some important figures

Turnover of different facilities in per cent of 1968 1969 1970 1971 1972 total turnover:

Deep water towing tank 34 30 27 32 30 Propulsion hydrodynamics - cavitation 13 6 9 10 8

Total, Ship Propulsion 47 36 36 42 38

Wave and current basin 22 32 29 13 21 Seakeeping basin 16 20 •| 1 25 19 Shallow water basin 9 6 12 8 7 Manoeuvring simulator 1 5 11

Total, Ship hydrodynamics - Offshore technology 47 58 59 51 58

Computer centre 6 6 5 7 4

Total turnover NSMB, per cent 100 100 100 100 100

Orders from foreign countries in per cent of 58 50 53 64 58 total turnover

NSMB research in percent of total turnover 12 16 10 24 19

Total income (turnover and other income) in per cent related to 1968 (Dfl. 9,191,000,-) = 100 100 110 122 115 131 Index of cost of living related to 1968 = 100 100 107.5 112.2 120.7 130.2

Personnel 311 311 339 337 323*

* Of which 40 are in Ede

33 34 Events in 1972

March 22 Prof, dr W. P. A. van Lammeren retired as President of the NSMB. Prof, dr J. D. van Manen appointed President of the NSMB.

April 28 Prof, dr J. D. van Manen awarded with the Gold Medal of the Royal Institution of Engineers in the Netherlands, Section Mechanical Engineering and Naval Architecture.

May 9 40th Anniversary of the NSMB. Installation of the Advisory Board of the NSMB.

May 24 Assignment of the depressurized towing tank by designers and building team to the NSMB.

June 9 Official start of the experimental phase of the depressurized towing tank by H. R. H. Prince Glaus of the Netherlands.

June 14 The NATO Information Exchange Group 6 'on ship design' of the NATO Naval Armaments Group visited the NSMB.

August 18 First propulsion test under vacuum carried out successfully. August 29- International jubilee meeting on the occasion of the 40th September 1 anniversary of the NSMB.

September 27 Mr J. W. Hupkes, chairman of the Board of Directors of the NSMB, awarded with the 'De Ruyter'-medal in gold. The numerically controlled drawing machine (scale 1 :1) was put in operation by His Excellency dr R. J. H. Kruisinga, Secretary of State of the Ministry of Transport, Hydraulics and Public Works.

November 29 The Ambassador of the United States of America, Mr J. W. Middendorf II, visited the NSMB.

35 Organization scheme and principal personnel of the IMSMB Management

President Prof. dr. J. D. van Manen

Vice-presidents A. H. Pastoor, Reg. Acc. Dr. J. P. Hooft J. J. IVluntjewerf Dr M. W. C. Oosterveld

Administration Ship powering Research and development Ship Dynamics-Offshore technology A. H. Pastoor, Reg. Acc. J. J. IVluntjewerf Dr M. W. C. Oosterveld Dr J. P. Hooft

Finance and personnel Deep water towing tank Depressurized towing tank Wave and current basin J. F. Meijer A. Jonk G. Kuiper G. F. M. Remery M. P. van der Veen W. van den Berg J. A. Pinkster S. van den Brand E. G. Kruithof General secretariate F. W. J. van Bochoven Industrial service connected with J. Kools powering and cavitation in Computer centre Seakeeping basin and high speed towing Depressurized towing tank tank Maintenance section Cavitation tunnels Hardware control M. F. van Sluijs Shallow water basin W. Verschuur S. G. Tan High speed towing tank Domestic section A. de Jong H. L. Minkenberg H. Rijken Software control C. Flokstra Planning and information Ship trials A. Koops W. Verschuur H. J. de Jonc J. Holtrop J. Esveldt G. D. Draaijer Shallo w water basin A. C. J. W. Oomen G. van Oortmerssen Drawing office and data processing of L. J. Boreel Instrumentation steady phenomena Industrial service E. R. Dolfin J. Kamps A. W. Ruys C. M. J. Gommers W. H. auf m Keller Manoeuvring simulator P. Kiers J. auf m Keller I. Oldenkamp H. Konijnenberg Mechanical section G. van der Werf G. Mak G. M. van der Bend K. Meurs Electronic section Reproduction Propulsion hydrodynamics P. C. Borstlap and structural mechanics P. J. Paymans Electrotechnical section Cavitation tunnels and special projects Modelshop Drawing office and data processing of J. H. J. van der Meulen dynamic phenomena Propeller shop R. J. Dommershuijzen Strength and vibrations H. van de Beek Photography S. Hylarides J. van der Kooy T. A. Oei

Propulsion hydrodynamics P. van Oossanen W. van Gent

Library Million Dutcii Guilders • 1971 131972

Tiie Netherlands Foreign countries NSiVlB Research

Amount of orders from the Netherlands, foreign countries and NSMB research in million guilders

37 %

55 < co 3 • 1971 E31972

50

45

40

35

30

25

20

15

3

10

O (D O inQ i ir 0) Distribution of orders from foreign countries in percentage

38