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Annual Report 1972 Netherlands Ship Model Basin Wageningen The 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
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