ASME/BATH 2019 Symposium on Fluid Power and Motion Control最新文献_第5页

A Ceramic Flat Slide Valve for Hydraulic Applications 一种液压用陶瓷平板滑阀

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1640

Stefan Aengenheister, Chao Liu, C. Broeckmann, K. Schmitz

{"title":"A Ceramic Flat Slide Valve for Hydraulic Applications","authors":"Stefan Aengenheister, Chao Liu, C. Broeckmann, K. Schmitz","doi":"10.1115/fpmc2019-1640","DOIUrl":"https://doi.org/10.1115/fpmc2019-1640","url":null,"abstract":"\u0000 With a flat slide valve concept, a reduction in leakage and an increase in service life could be achieved compared to conventional piston spool valves. In order to achieve a reduction in leakage flows and guarantee the adjustability of the valves at the same time, a correct design of the pressure compensation is essential. The level of force depends on the operating point of the valve and the position of the slider. Due to the design of the flat slide valve, it is possible to use ceramic semi-finished products for the main stage, which consists of control plates and a slide plate. The geometries are simple enough to be inexpensively manufactured with sufficient accuracy from a ceramic pre-product using laser cutting technology.\u0000 High-tech ceramics are a promising material, which can contribute to an improvement of the performance of the valves. The higher resistance of ceramic materials to abrasive wear further increases the service life of the valves. Furthermore, ceramic materials show lower friction coefficients compared to metallic materials, which is of great importance for the concept of the flat slide valve due to the sliding of the plates on top of each other. However, at the same time the use of ceramics, which are rarely used in hydraulics at the moment, means that the design must be appropriate to the material and must be taken into account when designing the main valve stage. This article presents the concept of the flat slide valve for a proportional 4/3-way valve. Therefore, the design of the pressure compensation is shown and the current design of the main valve stage is presented. This includes the design of the flow channels, which has to be suitable for ceramic materials. The preliminary design of the flow channels were executed with CFD-simulations. With the shown design the function of a 4/3-way valve, known from piston spool valves, can be implemented with a linear behavior between slide plate deflection and opening cross section.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114355408","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

Improving the Efficiency and Dynamic Properties of a Flow Control Unit in a Self-Locking Compact Electro-Hydraulic Cylinder Drive 提高自锁紧凑型电液缸驱动流量控制单元的效率和动态特性

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1671

Lasse Schmidt, Søren Ketelsen, D. Padovani, K. Mortensen

{"title":"Improving the Efficiency and Dynamic Properties of a Flow Control Unit in a Self-Locking Compact Electro-Hydraulic Cylinder Drive","authors":"Lasse Schmidt, Søren Ketelsen, D. Padovani, K. Mortensen","doi":"10.1115/fpmc2019-1671","DOIUrl":"https://doi.org/10.1115/fpmc2019-1671","url":null,"abstract":"\u0000 The introduction of low cost electric motor and drive solutions provides the possibility to design cost competitive compact speed-variable drives as potentially feasible alternatives to conventional valve-controlled solutions. A main drawback in existing self-contained drive technology is the power consumption in stationary load carrying situations. However, the recent introduction of compact self-locking drive topologies with separate forward and return flow lines allow to significantly minimize the power consumption, but introduces another problem. Dependent on the control of the flow device, a continuous, but lower power consumption compared to non-self-locking drive topologies may be present. Furthermore, the piston motion may exhibit a time delay due to an outlet pressure build-up phase in the flow unit prior to actuation of the cylinder, limiting the application range of such a drive concept. The purpose of the study presented, is to analyze these properties through model-based methods, and to establish control functionalities allowing to minimize these unfortunate features. The resulting flow device control structure allows for a significant reduction in the actuation time delay as well as in the power consumption in stationary load carrying situations. Numerical results demonstrate the properties announced by the theoretical analysis and control design phase, hence broadening the application range of the self-locking drive topology in question.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121339249","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: 11

A Hybrid Hydraulic-Electric Architecture (HHEA) for High Power Off-Road Mobile Machines 大功率越野移动机械的混合液压-电动结构(HHEA

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1628

Perry Y. Li, J. Siefert, D. Bigelow

{"title":"A Hybrid Hydraulic-Electric Architecture (HHEA) for High Power Off-Road Mobile Machines","authors":"Perry Y. Li, J. Siefert, D. Bigelow","doi":"10.1115/fpmc2019-1628","DOIUrl":"https://doi.org/10.1115/fpmc2019-1628","url":null,"abstract":"\u0000 Traditionally, off-road mobile machines such as excavators and wheel loaders are primarily powered by hydraulics and throttling valves are used to control their work circuits. In recent years, two general trends are towards more energy efficient systems and electrification. With electrification, both efficiency and control performance can be improved by the elimination of throttling losses and the use of high-bandwidth inverter control. Electrification is generally accomplished with Electro-hydraulic actuators (EHA) but they are limited to lower powered systems due to the high cost of electric machines capable of high power or high torque. This paper presents preliminary results of a new system architecture for off-road vehicles to improve efficiency and control performance. The architecture combines hydraulic power and electric power in such a way that the majority of power is provided hydraulically while electric drives are used to modulate this power. The hybrid hydraulic-electric architecture (HHEA) and its rationale are described. In addition, a case study is presented to illustrate its operation, its potential for energy saving, and its benefits of component downsizing. The case study indicates that compared to a baseline load sensing system, the HHEA has the potential to reduce energy consumption by more than 50%. Furthermore, the torque capability of the electrical components need only be ∼ 28% of what is required for the direct application of EHA.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976840","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: 14

Nonlinear Model-Based Control Design for a Hydraulically Actuated Spherical Wrist 基于非线性模型的液压驱动球腕控制设计

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1663

P. Mustalahti, J. Mattila

{"title":"Nonlinear Model-Based Control Design for a Hydraulically Actuated Spherical Wrist","authors":"P. Mustalahti, J. Mattila","doi":"10.1115/fpmc2019-1663","DOIUrl":"https://doi.org/10.1115/fpmc2019-1663","url":null,"abstract":"\u0000 Anthropomorphic hydraulic manipulator arms are extensively utilized for moving heavy loads in many industrial domains, e.g., in off-shore, construction and mining. By equipping these manipulator arms with an additional 3 degrees-of-freedom (DOF) spherical wrist mechanism, the dexterity and working envelope of the manipulator can be increased. For versatile operations, the motion range for the hydraulic wrist actuators should be close to 360 degrees with high torque output, with a compact volumetric size. Although the wrist can provide a high power-to-weight ratio, the actuators also introduce significant non-linearities in their dynamic behaviors. The complex dynamic behavior combined with high loads yield significant challenges in closed-loop control design. In this paper, we design a novel subsystem-dynamics-based controller for a hydraulically actuated spherical wrist mechanism utilizing the virtual decomposition control (VDC) approach. The proposed 3-DOF wrist controller is designed to be modular; thus, it can be connected as an plug-and-play subsystem into our previously designed state-of-the-art controller for a 3-DOF hydraulic manipulator arm. Stability proof of the overall 6-DOF system is provided. Experiments with a full-scale commercial hydraulic manipulator arm equipped with the 3-DOF spherical wrist demonstrate the effectiveness of the proposed method.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128809265","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: 3

Designing an Improved Controller for a Pump Direct Driven Electro-Hydraulic System Using a Nonlinear Flow Mapping 基于非线性流量映射的泵直驱电液系统改进控制器设计

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1699

Bobo Helian, Zheng Chen, B. Yao, Can-jun Yang

{"title":"Designing an Improved Controller for a Pump Direct Driven Electro-Hydraulic System Using a Nonlinear Flow Mapping","authors":"Bobo Helian, Zheng Chen, B. Yao, Can-jun Yang","doi":"10.1115/fpmc2019-1699","DOIUrl":"https://doi.org/10.1115/fpmc2019-1699","url":null,"abstract":"\u0000 Pump control systems are widely used, because of their energy saving properties and their high efficiency. Nevertheless, pump control systems generally have a low accuracy, because of the nonlinear pump flow and other nonlinearities of hydraulic systems. Furthermore, due to the underlaying high order dynamics, pump control systems have low response times, which is one of the main drawbacks. Servo motor-pump direct driven systems are commonly used in today’s industry. The application of servo motor pumps allow a reliable performance with quick response times. For low speeds, however, servo motor pumps do not achieve a high accuracy due to the pump flow deviation. The goal of this paper is to present a controller for a servo motor-pump direct driven system, which improves the accuracy especially at low pump speeds. For that purpose, the controller uses a nonlinear flow mapping, which maps the desired pump flow and pump pressure to the voltage input for the motor-pump. Additionally, the controller uses a backstepping method, which tracks the position as a first step and regulates the pressure as a second step. Comparison experiments to a controller without nonlinear flow mapping show that the controller designed in this paper has improved performances and tracking accuracy.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129683405","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

Switch-Mode Power Transformer in a Wave-Powered, Reverse Osmosis Desalination Plant 波浪动力反渗透海水淡化厂的开关式电源变压器

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-12-10 DOI: 10.1115/fpmc2019-1647

Jeremy Simmons, J. Ven

{"title":"Switch-Mode Power Transformer in a Wave-Powered, Reverse Osmosis Desalination Plant","authors":"Jeremy Simmons, J. Ven","doi":"10.1115/fpmc2019-1647","DOIUrl":"https://doi.org/10.1115/fpmc2019-1647","url":null,"abstract":"\u0000 In the reverse osmosis (RO) desalination process, a salt water solution is pressurized to overcome the osmotic pressure across a semi-permeable membrane. A few groups have proposed that a wave energy converter (WEC) having a seawater based, hydraulic power take-off can could be used to pressurize the feedwater for an RO system. However, coupling the wave energy harvesting process and the RO desalination process imposes unique design constraints on the fluid power system, such as pressure limits of conventional RO system components. In this study, a fluid power circuit with a switch-mode power transformer is used to transfer power while keeping the pressure of the power take-off and RO processes relatively decoupled. The switch-mode power transformer studied herein adds fewer costly components and less significant loss mechanisms to the system than a conventional hydraulic transformer performing the same function. The switch-mode power transformer uses the inertia of a hydraulic motor driven electric generator and switching of the hydraulic motor inlet between high and low-pressure sources to decrease the pressure at which power is being transmitted to the RO process. This process is analogous to DC-DC switching power transformers in the electrical domain. This study seeks to demonstrate this unique switch-mode system as a potential solution for coupling the wave-energy harvesting process with the reverse osmosis process. The system is modeled and studied in the context that the transformer and RO system are onshore, 500 meters from the WEC. Power captured from the WEC is transmitted through a long pipeline to shore. A distributed parameter model is used to model the pipeline dynamics, simultaneously revealing the significance of these dynamics and the robustness with which the switch-mode transformer decouples the pressure dynamics at the RO feed from the pipeline dynamics. The switch-mode power transformer is estimated to be 76% efficient while the system, as a whole, is estimated to be 45% efficient.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129938232","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 More Accurate Definition of Mechanical and Volumetric Efficiencies for Digital Displacement® Pumps 更准确地定义数字位移泵的机械和容积效率

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-10-07 DOI: 10.1115/fpmc2019-1668

C. Williamson, N. Manring

{"title":"A More Accurate Definition of Mechanical and Volumetric Efficiencies for Digital Displacement® Pumps","authors":"C. Williamson, N. Manring","doi":"10.1115/fpmc2019-1668","DOIUrl":"https://doi.org/10.1115/fpmc2019-1668","url":null,"abstract":"\u0000 The apparent volumetric displacement of digital displacement pumps and motors is reduced with increasing fluid pressure. So-called pump shrinkage has been documented in previous publications, where fluid compressibility effects were assumed to affect input and output power equally. In this paper, the authors derive the torque and flow rate of an ideal digital displacement pump. It is shown that the output power shrinks slightly more than the input. The difference between input and output shrinkage is counted as a power loss according to the accepted definition of total efficiency. New equations are presented for calculating mechanical and volumetric efficiencies which are up to 2% more accurate than the previous method (which assumes equal shrinkage) and up to 5% more accurate than conventional equations (which assume no shrinkage). Compressibility effects may be even more significant depending on pump design parameters, fluid properties, flow control algorithms and operating conditions. Calculations of partial pump efficiencies require a derived displacement volume to be known. The derived displacement volume of digital displacement pumps is considered for the first time in this paper. The contributions of this work are instructive for understanding the unique characteristics of digital displacement pumps as well as check-valve type pumps in general.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131087090","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: 8

Stirling Thermocompressor: Lumped Parameter Modeling and Experimental Impact of Displacer Motion Profile on Work Output 斯特林热压缩机:集总参数建模和实验影响的位移运动轮廓对功输出

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-10-07 DOI: 10.1115/fpmc2019-1683

Seth Thomas, E. Barth

{"title":"Stirling Thermocompressor: Lumped Parameter Modeling and Experimental Impact of Displacer Motion Profile on Work Output","authors":"Seth Thomas, E. Barth","doi":"10.1115/fpmc2019-1683","DOIUrl":"https://doi.org/10.1115/fpmc2019-1683","url":null,"abstract":"\u0000 The thermocompressor, a little-known class of Stirling devices that efficiently compresses gas, presents new challenges for modeling and experimental validation. In modeling, traditional analytic assumptions about displacer motion are limiting. In experimental verification, few devices have actually been built and tested. In this paper, the authors test the feasibility of a lumped-parameter approach for predicting the performance of Stirling thermocompressors subject to different displacer motion profiles. Since the displacer of a thermocompressor can be controlled independently, unlike kinematic Stirling engines or dynamic Stirling engines, and has a large influence on output power and efficiency of the device, it is crucial that this is well captured by a system dynamics model for control. Key model parameters are simulated and results are experimentally verified on one of the few, if only, experimental thermocompressor platforms in the world. Conclusions are drawn regarding simplified modeling of the regenerator’s effectiveness and the effects on device work output by varying the displacer piston’s motion profile using different waveforms.","PeriodicalId":262589,"journal":{"name":"ASME/BATH 2019 Symposium on Fluid Power and Motion Control","volume":"608 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123266243","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: 3

Definition of Performance Requirements and Test Cases for Offshore/Subsea Winch Drive Systems With Digital Hydraulic Motors 采用数字液压马达的海上/海底绞车驱动系统的性能要求和测试案例的定义

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-10-07 DOI: 10.1115/fpmc2019-1670

Sondre Nordås, M. Ebbesen, T. Andersen

引用次数: 1

Efficiency Optimized Pneumatic Pressure Booster 效率优化气动增压

ASME/BATH 2019 Symposium on Fluid Power and Motion Control Pub Date : 2019-10-07 DOI: 10.1115/fpmc2019-1675

O. Reinertz, K. Schmitz

引用次数: 0