International Journal of Fluid Power最新文献_第7页

Neural Network Identification and Direct Adaptive Fuzzy Neural Network (DAFNN) Controller for Unknown Nonlinear Non-affine Pneumatic Servo System 未知非线性非仿射气动伺服系统的神经网络辨识与直接自适应模糊神经网络(DAFNN)控制器

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International Journal of Fluid Power Pub Date : 2021-05-01 DOI: 10.13052/IJFP1439-9776.2211

Peyman Mawlani, M. Arbabtafti

{"title":"Neural Network Identification and Direct Adaptive Fuzzy Neural Network (DAFNN) Controller for Unknown Nonlinear Non-affine Pneumatic Servo System","authors":"Peyman Mawlani, M. Arbabtafti","doi":"10.13052/IJFP1439-9776.2211","DOIUrl":"https://doi.org/10.13052/IJFP1439-9776.2211","url":null,"abstract":"In this paper, a direct adaptive fuzzy neural network (DAFNN) controller for trajectory tracking control of the non-linear non-affine pneumatic servo system is presented. First, using a neural network identifier, the non-linear dynamics of a real pneumatic servo system is simulated. By comparing the output of the neural network and the output of the experimental setup, it is observed that the non-linear pneumatic actuator system is well-identified using neural networks. By incorporating the Lyapunov stability theorem, the adaptive laws for the parameters of the controller are obtained, parameter boundedness and stability of the closed-loop system are guaranteed. Finally, practical results are successfully implemented for trajectory tracking control of the pneumatic servo system, in which the effect of the simultaneous updating of the antecedent and consequent’s parameters of the fuzzy neural network controller has been investigated. The tracking error ±1.3mm and ±1 mm for proposed updating method compared to ±2.5mm and ±3.5mm, for a case that the weigh parameters are merely adjusted, are obtained. The results indicate the proposed adjustment method improves the performance of the controller in the presence of unknown nonlinearities and dynamics uncertainty.","PeriodicalId":13977,"journal":{"name":"International Journal of Fluid Power","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48159547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Digital Displacement Hydrostatic Wind-turbine Transmission 一种数字位移静压风力发电机传动系统

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International Journal of Fluid Power Pub Date : 2021-05-01 DOI: 10.13052/IJFP1439-9776.2213

W. Rampen, D. Dumnov, Jamie Taylor, Henry Dodson, J. Hutcheson, N. Caldwell

{"title":"A Digital Displacement Hydrostatic Wind-turbine Transmission","authors":"W. Rampen, D. Dumnov, Jamie Taylor, Henry Dodson, J. Hutcheson, N. Caldwell","doi":"10.13052/IJFP1439-9776.2213","DOIUrl":"https://doi.org/10.13052/IJFP1439-9776.2213","url":null,"abstract":"In 1984 a hydrostatic wind-turbine transmission with ‘secondary control’ was proposed by Stephen Salter using the, then only conceptual, Digital Displacement® (DD) principle for controlling the flow of the primary, rotor-driven, ring-cam pump. This transmission ‘could achieve the correct ratio of tip-speed to wind-speed in conjunction with true synchronous generation’. \u0000In the following years DD machines were progressively developed. To start with they were relatively small in capacity but the power ratings were systematically increased, until it seemed that a high-power hydrostatic wind-turbine transmission might indeed be feasible. In 2006, Artemis Intelligent Power (Artemis), a company that had been formed from Salter's original university team, began working on a megawatt-scale, hydrostatic, wind-turbine transmission based on new pump and motor designs. In 2011 Artemis completed a 1.5 MW transmission and dynamometer test-rig. This was one of the largest hydraulic transmissions ever made and, with a shaft-to-shaft efficiency of 93%, one of the most efficient. Using secondary control to respond rapidly to gusting wind and to instantaneous grid faults, it was also the most controllable. This paper discusses the design of the transmission and test-rig and presents the results of steady-state efficiency tests. Subsequent papers will describe systematic experimental work to account for the various energy losses and to develop a comprehensive simulation model of the DD wind-transmission.","PeriodicalId":13977,"journal":{"name":"International Journal of Fluid Power","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44429836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Model-based Simulation of a Hydraulic Closed-loop Rotary Transmission with Automatic Control 液压闭环自动控制回转传动的模型仿真

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International Journal of Fluid Power Pub Date : 2021-05-01 DOI: 10.13052/IJFP1439-9776.2212

G. Grossschmidt, M. Harf

引用次数: 0

Internal Leakages in a Water Hydraulic Pump with Gears From Plastic 塑料齿轮液压泵的内部泄漏

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International Journal of Fluid Power Pub Date : 2021-02-06 DOI: 10.13052/IJFP1439-9776.2133

Michael D. Banas

引用次数: 1

Control of the Test Rig for Spring Stiffness Measurement with Hydraulic Integrated Actuator and Computer Vision 液压集成作动器与计算机视觉对弹簧刚度测量试验台的控制

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International Journal of Fluid Power Pub Date : 2021-02-06 DOI: 10.13052/IJFP1439-9776.2131

P. Noskievič, Melvin Alexis Lara de León

{"title":"Control of the Test Rig for Spring Stiffness Measurement with Hydraulic Integrated Actuator and Computer Vision","authors":"P. Noskievič, Melvin Alexis Lara de León","doi":"10.13052/IJFP1439-9776.2131","DOIUrl":"https://doi.org/10.13052/IJFP1439-9776.2131","url":null,"abstract":"The paper deals with the control of the test rig for measurement of the stiffness of the spring. The test rig is equipped with integrated hydraulic actuator and multilayer control system with computer vision to automate the testing process and to increase the safety of the operating staff during the testing. The integrated hydraulic actuator allows to control the piston velocity and position and to produce the force needed for the spring compression and stiffness measurement. It has an integrated manifold with four proportional flow control valves connected as the full hydraulic resistance bridge. Each control valve is controlled separately using the input signal. That makes it possible to realize different connections and control strategies of the hydraulic cylinder using the different control algorithms. The hydraulic circuit was modelled and simulated, and the achieved simulation results are presented in the paper. The test rig is controlled using the microprocessor control system and is it equipped by different transducers – position transducer, pressure transducers and force transducer to be able to collect data important for the stiffness characteristic evaluation. The upper level of the control system is created by the vision control system. The goal of the implementation of the machine vision is to decrease the number of the manual operations done by the technician by the spring testing and to extend the automatic testing cycle of the automatic computer vision-controlled movement of the actuator at the beginning of the testing cycle and finally to increase the safety of the operating staff. The structure and functionality of the designed control system, experimentally obtained results and evaluated stiffness characteristic of the tested spring are presented in the following chapters.","PeriodicalId":13977,"journal":{"name":"International Journal of Fluid Power","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44076111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving Gerotor Pump Performance Trough Design, Modeling and Simulation 通过设计、建模和仿真提高转子泵的性能

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International Journal of Fluid Power Pub Date : 2021-02-06 DOI: 10.13052/IJFP1439-9776.2132

L. Ivanović, M. Matejic

引用次数: 2

Influence of Boundary Conditions on the Accuracy of Pulsation Dampers Characteristics in Analytical Models 边界条件对解析模型中脉动阻尼器特性精度的影响

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International Journal of Fluid Power Pub Date : 2021-02-06 DOI: 10.13052/IJFP1439-9776.2134

U. Warzyńska, T. Siwulski

引用次数: 1

Stability Analysis of Spools with Imperfect Sealing Gap Geometries 密封间隙几何形状不完美的线轴稳定性分析

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International Journal of Fluid Power Pub Date : 2021-02-06 DOI: 10.13052/IJFP1439-9776.2135

R. Rituraj, R. Scheidl

{"title":"Stability Analysis of Spools with Imperfect Sealing Gap Geometries","authors":"R. Rituraj, R. Scheidl","doi":"10.13052/IJFP1439-9776.2135","DOIUrl":"https://doi.org/10.13052/IJFP1439-9776.2135","url":null,"abstract":"Spools in hydraulic valves are prone to sticking caused by unbalanced lateral forces due to geometric imperfections of their sealing lands. This sticking problem can be related to the stability of the coaxial spool position. Numerical methods are commonly used to study this behaviour. However, since several parameters can influence the spool stability, parametric studies become significantly computationally expensive and graphical analysis of the numerical results in multidimensional parameter space becomes difficult. \u0000To overcome this difficulty, in this work, an analytical approach for studying the stability characteristics of the spool valve is presented. A Rayleigh-Ritz method is used for solving the Reynolds equation in an approximate way in order to determine an analytical expression for the lateral force on the sealing lands. This analytical expression allows stability analysis of the spool via analytical means which finally results in the expression of critical axial velocity which demarcates the regions of stable behaviour. Simplicity of the expression allows an immediate insight into the role of design parameters in the stability of the spool. To verify the analytical model, a numerical model for spool dynamics is developed in this work and the numerical results are found to match the analytical model in terms of the stability behaviour of the spool.","PeriodicalId":13977,"journal":{"name":"International Journal of Fluid Power","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48567313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Influence of Air Dissolved in Hydraulic Oil on Cavitation Erosion 液压油中溶解空气对气蚀的影响

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International Journal of Fluid Power Pub Date : 2021-01-01 DOI: 10.13052/ijfp1439-9776.2234

Sven Osterland, L. Müller, J. Weber

{"title":"Influence of Air Dissolved in Hydraulic Oil on Cavitation Erosion","authors":"Sven Osterland, L. Müller, J. Weber","doi":"10.13052/ijfp1439-9776.2234","DOIUrl":"https://doi.org/10.13052/ijfp1439-9776.2234","url":null,"abstract":"This article gives experimentally evidence that cavitation erosion in hydraulic components like valves and pumps is caused by vapour cavitation not gas or pseudo cavitation. In fact, the free air content which is released by vapour and gas cavitation reduces the erosion significantly. In order to clearly separate the different cavitation types, a test rig with a specially designed reservoir with integrated degassing capability is presented. As flow geometry a valve model with realistic dimensions and under realistic operating conditions was used, which ensures very high transferability of the results to the reality of hydraulic components in practical applications and typical operating conditions. A total of 4 five-hour long tests are performed and analysed. The quantification of the cavitation erosion is determined by the mass loss of the copper samples. The experimental results show a 4.4–5.1 times higher mass loss in tests with air-free oil compared to tests with air-saturated or oversaturated hydraulic oil. The experimental fact that air-free hydraulic oil causes significantly more cavitation erosion than normal (saturated) hydraulic oil, and its implications are discussed. The conclusion can be drawn, that further developments of hydraulic components and systems towards the use of air-free oil or increasing power densities will be disproportionately challenged by cavitation erosion.","PeriodicalId":13977,"journal":{"name":"International Journal of Fluid Power","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66116676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Digital Hydraulic Technology for Linear Actuation: A State of the Art Review 线性驱动的数字液压技术：最新进展

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International Journal of Fluid Power Pub Date : 2020-12-04 DOI: 10.13052/IJFP1439-9776.2125

V. Donkov, T. Andersen, M. Linjama, M. Ebbesen

引用次数: 4