Energy Efficiency Comparison of Hydraulic Accumulators And
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Accumulator Technology. E 3.000.14/03.16 1
Accumulator Technology. E 3.000.14/03.16 1. HYDAC ACCUMULATOR TECHNOLOGY FLUID ENGINEERING EFFICIENCY VIA ENERGY MANAGEMENT. HYDAC Accumulator Technology has over 50 years' experience in research & development, design and production of Hydac accumulators. Bladder, piston, diaphragm and metal bellows accumulators from HYDAC together form an unbeatable range and as components or units, support hydraulic systems in almost all sectors. The main applications of our accumulators are: z Energy storage, z Emergency and safety functions, z Damping of vibrations, fluctuations, pulsations (pulsation damper), shocks (shock absorber) and noise (silencer), z Suction flow stabilisation, z Media separation, z Volume and leakage oil adjustment, z Weight equalization, z Energy recovery. Using accumulators improves the performance of the whole system and in detail this has the following benefits: z Improvement in the functions z Increase in service life z Reduction in operating and maintenance costs z Reduction in pulsations and noise On the one hand, this means greater safety and comfort for operator and machine. On the other hand, HYDAC accumulators enable efficient working in all applications. 2. QUALITY In conjunction with the customer service department at HYDAC's headquarters, Basic criteria, such as: Quality, safety and reliability are paramount service is possible worldwide. z for all HYDAC accumulator components. Design pressure, HYDAC's worldwide distributor network z Design temperature, They comply with the current regulations means that trained staff are close at hand (or standards) for pressure vessels in the to help our customers. z Fluid displacement volume, individual countries of installation. z Discharge / Charging velocity, In taking delivery of a HYDAC hydraulic z Fluid, accumulator therefore, the customer is This ensures that HYDAC customers have the support of an experienced workforce z Acceptance specifications and also assured of a high-quality accumulator product which can be used in every both before and after sale. -
780 Solid Waste Maintenance Technician
780 Solid Waste Maintenance Technician Nature of Work This is skilled mechanical and maintenance work performing a variety of activities associated with the repair and routine maintenance of a variety of solid waste trucks and machinery used for solid waste operations. Activities associated with the job include performing routine preventive maintenance, safety inspections and repair work on all trucks, machinery and equipment, changing and repairing large truck tires, and assisting with building maintenance and repair activities. Additional activities include diagnosing vehicle components and/or equipment malfunctions, performing minor body work and welding and fabricating parts when required, repairing hydraulic equipment located at convenience centers and assisting with transfer station and landfill operations when necessary. Job duties require considerable knowledge and experience in vehicle repair and maintenance, hydraulics, welding, air conditioning repair and metal fabrication, considerable knowledge of building maintenance and repair activities, good organizational, interpersonal and decision making skills and sufficient strength and agility to perform the physically demanding aspects of the job in a variety of weather conditions. Job performance is evaluated by the Solid Waste Director through review of daily repair work and preventive maintenance activities on trucks and machinery, level of support provided for building maintenance activities, accuracy of job related information related to the procurement and purchase of parts and equipment, diagnostic capabilities and quality of the repair work performed. Illustrative Examples of Work -Performs minor repair work and preventive maintenance activities on solid waste trucks, vehicles, machinery and equipment. -Troubleshoots and diagnoses equipment malfunctions to determine needed repairs. -Rebuilds and/or repairs electrical, cooling, suspension, and braking components and systems. -
Modelling, Testing and Analysis of a Regenerative Hydraulic Shock Absorber System
energies Article Modelling, Testing and Analysis of a Regenerative Hydraulic Shock Absorber System Ruichen Wang *, Fengshou Gu, Robert Cattley and Andrew D. Ball School of Computing and Engineering, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK; [email protected] (F.G.); [email protected] (R.C.); [email protected] (A.D.B.) * Correspondence: [email protected]; Tel.: +44-01484-473640 Academic Editor: Paul Stewart Received: 31 March 2016; Accepted: 12 May 2016; Published: 19 May 2016 Abstract: To improve vehicle fuel economy whilst enhancing road handling and ride comfort, power generating suspension systems have recently attracted increased attention in automotive engineering. This paper presents our study of a regenerative hydraulic shock absorber system which converts the oscillatory motion of a vehicle suspension into unidirectional rotary motion of a generator. Firstly a model which takes into account the influences of the dynamics of hydraulic flow, rotational motion and power regeneration is developed. Thereafter the model parameters of fluid bulk modulus, motor efficiencies, viscous friction torque, and voltage and torque constant coefficients are determined based on modelling and experimental studies of a prototype system. The model is then validated under different input excitations and load resistances, obtaining results which show good agreement between prediction and measurement. In particular, the system using piston-rod dimensions of 50–30 mm achieves recoverable power of 260 W with an efficiency of around 40% under sinusoidal excitation of 1 Hz frequency and 25 mm amplitude when the accumulator capacity is set to 0.32 L with the load resistance 20 W. -
Final Report MO-2017-203: Burst Nitrogen Cylinder Causing Fatality, Passenger Cruise Ship Emerald Princess, 9 February 2017
Final report MO-2017-203: Burst nitrogen cylinder causing fatality, passenger cruise ship Emerald Princess, 9 February 2017 The Transport Accident Investigation Commission is an independent Crown entity established to determine the circumstances and causes of accidents and incidents with a view to avoiding similar occurrences in the future. Accordingly it is inappropriate that reports should be used to assign fault or blame or determine liability, since neither the investigation nor the reporting process has been undertaken for that purpose. The Commission may make recommendations to improve transport safety. The cost of implementing any recommendation must always be balanced against its benefits. Such analysis is a matter for the regulator and the industry. These reports may be reprinted in whole or in part without charge, providing acknowledgement is made to the Transport Accident Investigation Commission. Final Report Marine inquiry MO-2017-203 Burst nitrogen cylinder causing fatality, passenger cruise ship Emerald Princess, 9 February 2017 Approved for publication: November 2018 Transport Accident Investigation Commission About the Transport Accident Investigation Commission The Transport Accident Investigation Commission (Commission) is a standing commission of inquiry and an independent Crown entity responsible for inquiring into maritime, aviation and rail accidents and incidents for New Zealand, and co-ordinating and co-operating with other accident investigation organisations overseas. The principal purpose of its inquiries is to determine the circumstances and causes of occurrences with a view to avoiding similar occurrences in the future. Its purpose is not to ascribe blame to any person or agency or to pursue (or to assist an agency to pursue) criminal, civil or regulatory action against a person or agency. -
Handheld Hydraulic Equipment Your Business Is in Good Hands
HANDHELD HYDRAULIC EQUIPMENT YOUR BUSINESS IS IN GOOD HANDS Hydraulics lets you do more in less time. It allows tools to hit harder with less vibration and noise. Hydraulics is simply better. The first time you see a hydraulic horsepower power pack delivers the small enough to fit on a shelf or in breaker you might think it’s nothing same power at the tool tip as a 20 a service van saving you fuel. Two special. It’s compact, quiet and horsepower diesel compressor engine. people can carry the power pack with appears to vibrate less than electric ease. and pneumatic tools. But there’s more In fact, for the price of one compressor to it than meets the eye. and breaker you can buy two If you already use hydraulic tools, you complete hydraulic power pack/ know what you get. If you’re new to When you press the trigger you’ll be breaker packages. And hydraulics hydraulics, you and your business are in for a surprise. Hydraulic oil is a pays even when it’s turned off. The in good hands. powerful energy transmitter. A nine energy efficient power packs are 2 KNOW YOUR HYDRAULICS Here are the essentials on why and when hydraulics is the best choice to get the work done on time and on budget. With just one or two moving parts, Association) standards. That means tools can be connected to a range there’s minimal wear and very few easy, fast and safe connections of different power sources such as parts to replace. -
Estimating Reversible Pump-Turbine Characteristics
A WATER RESOURCES TECHNICAL PUBLICATION ENGINEERING MONOGRAPH NO. 39 Estimating Reversible Pump-TurbineCharacteristics UNtTED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATlON MS-230 (l-76) Bureau of Reclamation TECHNICAL REiPORT STANDARD TITLE PAG 3. RECIPIENT’S CATALOG NO. 4. TITLE AND SUBTITLE 5. REPORT DATE Estimating Reversible Pump-Turbine December 1977 Characteristics 6. PERFORMING ORGANIZATION CODE 7. AUTHOR(S) 6. PERFORMING ORGANIZATION REPORT NO. R. S. Stelzer and R. N. Walters Engineering Monograph 39 9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. Engineering and Research Center Bureau of Reclamation 11. CONTRACT OR GRANT NO. Denver, CO 80225 13. TYPE OF REPORT AND PERIOD COVERED 2. SPONSORING AGENCY NAME AND ADDRESS Same 14. SPONSORING AGENCY CODE 5. SUPPLEMENTARY NOTES 6. ABSTRACT The monograph presents guidelines for designers who plan or maintain pump-turbine installations. Data are presented on recent installations of pump-turbines which include figures showing operating characteristics, hydraulic performance, and sizing of the unit. Specific speed, impeller/ runner diameter, and the best efficiency head and discharge were aelectei as the criteria that characterize the unit performance. 7. KEY WORDS AND DOCUMENT ANALYSIS I. DESCRIPTORS-- / pumped storage/ *pump turbines/ powerplants/ reversible turbines/ Francis turbines/ pumps/ power head/ turbine efficiency/ specific speed/ cavitation index/ hydraulic machinery/ design criteria ). IDENTIFIERS-- / Flatiron Powerplant, CO/ Mt. Elbert Pumped-Storage Power- plant, CO/ Grand Coulee Pumping Plant, WA/ San Luis Pumping-Generating/ Senator Wash Dam, CA/ :. COSATI Field/Group 13G COWRR: 1307.1 6. DISTRIBUTION STATEMENT 19. SECURITY CLASS pt. NO. OF PAGI ITHIS REPORT) \voiloble from the National Technical Information Service, Operations UNCLASSIFIED division, Springfield. -
Electro-Hydraulic Components and Systems
Hydraulic Systems Volume 2 Electro-Hydraulic Components and Systems Dr. Medhat Kamel Bahr Khalil, Ph.D, CFPHS, CFPAI. Director of Professional Education and Research Development, Applied Technology Center, Milwaukee School of Engineering, Milwaukee, WI, USA. Compu Draulic LLC www.CompuDraulic.com Compu Draulic LLC Hydraulic System Volume 2 Electro-Hydraulic Components and Systems ISBN: 978-0-9977634-2-3 Printed in the United States of America First Published by 2017 Revised by January 2019 All rights reserved for CompuDraulic LLC. 3850 Scenic Way, Franksville, WI, 53126 USA. www.compudraulic.com No part of this book may be reproduced or utilized in any form or by any means, electronic or physical, including photocopying and microfilming, without written permission from CompuDraulic LLC at the address above. Disclaimer It is always advisable to review the relevant standards and the recommendations from the system manufacturer. However, the content of this book provides guidelines based on the author's experience. Any portion of information presented in this book could be not applicable for some applications due to various reasons. Since errors can occur in circuits, tables, and text, the author/publisher assumes no liability for the safe and/or satisfactory operation of any system designed based on the information in this book. The author/publisher does not endorse or recommend any brand name product by including such brand name products in this book. Conversely the author/publisher does not disapprove any brand name product by not including such brand name in this book. The publisher obtained data from catalogs, literatures, and material from hydraulic components and systems manufacturers based on their permissions. -
Offshore Availability for Wind Turbines with a Hydraulic Drive Train
Offshore availability for wind turbines with a hydraulic drive train James Carroll*, Alasdair McDonald †, David McMillan ‡, Julian Feuchtwang • *University of Strathclyde, Scotland. [email protected], †University of Strathclyde, Scotland. [email protected]. ‡University of Strathclyde, Scotland. [email protected]. • University of Strathclyde, Scotland. [email protected] Keywords: Reliability, Availability, Hydraulic, Drive train. a hydraulic drive train using a number of different data sources. Failure rates and repair times will be estimated Abstract through past publications [1] and the use of offshore reliability data from the oil and gas industry [2]. Recent Hydraulic drive trains for wind turbines are under papers [3, 4] that estimate offshore availability include a development by a number of different companies; at least one number of different offshore drive train types but due to the hydraulic drive train is in the final stages of development by a non-availability of data the hydraulic drive train was leading wind turbine manufacturer. Hydraulic drive trains excluded. have a number of advantages such as redundancy, modularity, compactness and track record in other industries. Currently Reference [3] uses a model based on a probabilistic-statistical there are few or no installed wind turbines with hydraulic approach to calculate the turbine access delays caused due to drive trains onshore or offshore. As no data exists on poor sea conditions. Along with estimated failure rates and reliability or failure rates for wind turbines with hydraulic repair times for the hydraulic drive train, this model will be drive trains, this paper estimates failure rates, repair time and used to work out the overall availability for the different drive availability for said turbines. -
Hydraulic Machinery • Turbine Is a Device That Extracts Energy from a Fluid (Converts the Energy Held by the Fluid to Mechanical Energy)
Hydraulic Machines power point presentation Slides has been adapted from Hydraulic Machines, K. Subramanya 2016-2017 Prepared by Dr. Assim Al-Daraje 1 Chapter (1 Part 1) Prepared by Dr. Assim Al-Daraje INTRODUCTION 2 Hydraulic machinery • Turbine is a device that extracts energy from a fluid (converts the energy held by the fluid to mechanical energy) • Pumps are devices that add energy to the fluid (e.g. pumps, fans, blowers and compressors). 3 INTRODUCTION Fluid-flow machines are very broadly classified as turbo-machines and positive displacement machines. A turbo-machine is a device that adds energy to a fluid or extracts energy from the fluid by virtue of a rotating system of blades. These machines require a rotating element called rotor and relative motion between the fluid and the rotor. 4 If the machine adds energy it is called a pump; if it extracts energy it is called a turbine. The fluid to be pumped can be in incompressible mode throughout its passage in the machine or compressibility effects may come in to picture at different phases of its interaction in the machine. If the fluid is water, the pump device is labeled as water pump. 5 Turbines • J.V. Poncelet first introduced the idea of the development of mechanical energy through hydraulic energy • Modern hydraulic turbines have been developed by L.A. Pelton (impulse), G. Coriolis and J.B. Francis (reaction) and V Kaplan (propeller) 6 A-Pelton Wheel, B-Francis, Turbine, C-Kaplan Turbine 7 Pelton (impulse) 8 9 Kaplan (propeller) 10 11 Turbines • Hydro electric power is the most remarkable development pertaining to the exploitation of water resources throughout the world • Hydroelectric power is developed by hydraulic turbines which are hydraulic machines. -
Modeling and Analysis of Hydraulic Energy Storage System for Hybrid Locomotives
A Thesis entitled Modeling and Analysis of Hydraulic Energy Storage System for Hybrid Locomotives by Boya Zhang Submitted to the Graduate Faculty as partial fulfillment of the requirements for the Master of Science Degree in Mechanical Engineering Dr. Walter W. Olson, Committee Chair Dr. Hongyan Zhang, Committee Member Dr. Yong Gan, Committee Member Dr. Patricia R. Komuniecki, Dean College of Graduate Studies The University of Toledo Dec 2010 Copyright 2010, Boya Zhang This document is copyrighted material. Under copyright law, no parts of this document may be reproduced without the expressed permission of the author. An Abstract of Modeling and Analysis of Hydraulic Energy Storage System for Hybrid Locomotives by Boya Zhang Submitted to the Graduate Faculty as partial fulfillment of the requirement for the Master of Science in Mechanical Engineering The University of Toledo Dec 2010 Hybrid locomotive have more than one power source to provide driving power. The prime power source of a hybrid locomotive can be a diesel engine or fuel cell, and the on-board energy storage system can provide a secondary power. The rechargeable energy storage system (RESS) of hybrid locomotives can temporarily store energy which is captured from braking action or redundant energy produced by the diesel engine to reduce fuel consumption and pollution. The Electro-mechanical Battery (EMB) which is a energy storage system for hybrid locomotives, consisting of the accumulator, pump/motor, reservoir and an electric motor/generator is introduced in this thesis. The hydraulic energy storage system has the advantages of high power density and low cost compared to the other vehicle‟s energy storage systems and has the potential to be an energy storage system for hybrid locomotives. -
Theoretical Simulation of Static and Dynamic Behavior of Electro-Hydraulic Servo Valves
Scientific Bulletin of the The 6th International Conference on Politehnica University of Timisoara Hydraulic Machinery and Hydrodynamics Transactions on Mechanics Special issue Timisoara, Romania, October 21 - 22, 2004 THEORETICAL SIMULATION OF STATIC AND DYNAMIC BEHAVIOR OF ELECTRO-HYDRAULIC SERVO VALVES Victor BALASOIU, Prof.* Mircea Octavian POPOVICIU, Prof. Department of Hydraulic Machinery Department of Hydraulic Machinery “Politehnica” University of Timisoara “Politehnica” University of Timisoara Ilare BORDEASU, Assoc. Prof. Department of Hydraulic Machinery “Politehnica” University of Timisoara *: Bv Mihai Viteazu 1, 300222, Timisoara, Romania, Tel.: (+40) 256 403681, Fax: (+40) 256 403700, (+) 256 4030682, Email: [email protected], [email protected] ABSTRACT The electro-hydraulic servo-valves (EHSV) as in- range Yoi and the clearance J over the linearity degree terface in automatic hydraulic systems are in essence and the magnitude of the adjusted flow. hydroelectric directional control valves with cylindrical The model of the dynamic equilibrium of the spool spool, with integral reaction. The output quantity valve is defined starting with the computation of forces (flow rate, pressure) is modified proportional with acting on the spool. Introducing the concept of interac- the control signal (voltage, current) together link tion between the aggregate components nozzle-spool- (electrical, hydraulic or mechanical). Both the manner distributor it was defined the mathematical model for in which the reaction signal is produced and the the directional spool valve as a whole. position of the information circuit where it is applied, After defining the transfer function, both analyze characterises the type but also static and dynamic and syntheses of performances were possible for the behavior of the servo valve. -
The Influence of Gear Micropump Body Asymmetry on Stress Distribution
POLISH MARITIME RESEARCH 1 (93) 2017 Vol. 24; pp. 60-65 10.1515/pomr-2017-0007 THE INFLUENCE OF GEAR MICROPUMP BODY ASYMMETRY ON STRESS DISTRIBUTION Wacław Kollek, Prof. Piotr Osiński Urszula Warzyńska Wrocław University of Science and Technology, Poland ABSTRACT The paper presents the results of numerical calculations of stress distributions in the gear micropump body for applications in hydraulic systems, especially in the marine sector. The scope of the study was to determine the most favorable position of bushings and pumping unit in the gear pump body in terms of stress and displacement distribution in the pump housing. Fourteen cases of gear pump bushings and pumping unit locations were analyzed: starting from the symmetrical position relative to the central axis of the pump, up to a position shifted by 2.6 mm towards the suction channel of the pump. The analysis of the obtained calculation results has shown that the most favorable conditions for pump operation are met when the bushings are shifted by 2.2 mm towards the suction channel. In this case the maximal stress was equal to 109 MPa, while the highest displacement was about 15µm. Strength and stiffness criteria in the modernized pump body were satisfied. Keywords: gear micropump, microhydraulics, finite element method 17, 19, 20, 21, 22]. The development of modern gear units is INTRODUCTION associated with the following trends: increasing operating pressure [6, 18], improving total efficiency [4, 10, 15, 18, 23], Gear pumps are the most common group of positive reducing pressure pulsations [3, 18, 25], minimizing weight displacement pumps used in hydrostatic drive systems as [15] and noise [11, 14, 16], and reducing dynamic loads [7, 12, power generators, as well as in lubrication systems in various 13, 19].