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Water Hydraulic 2/2 Directional Valve with Plane Piston Structure

Chinese Journal of Mechanical Engineering 2009年第1期22卷 109-115页

作者： GONG Yongjun YANG Huayong wang zuwen Laboratory of Fluid Power Transmission and Control Dalian Maritime University DaLian 116026 China The State Key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

Due to the fire resistance and environmental compatibility, using water as the working fluid in hydraulic circuits is receiving an increasing attention by both manufactures and users. This hydraulic directional valve is developed. When new water hydraulic directional valve is designed and manufactured, this paper introduces a water hydraulic 2/2 directional valve and its principle. The valve is composed of a hydraulically operated seat valve and a magnetic 3/2 direction valve. Aimed at the serious leakage and impact generating easily in reversing suddenly, an improved structure of water space seal is changed to direct seal, compaction force between main valve spool and main valve pocket was logically designed and damper in pilot valve port is matched with sensitive cavity in main valve. From the view of flow control, the methods of cavitation resistanee of the directional water hydraulic valve are investigated. The computational fluid dynamics approaches are applied to obtain static pressure distributions and cavitation images in the channel of the main stage of the valve with two kinds of structure. The results show that the method of optimized spout can effectively restrain cavitation. The work provides some useful reference for developing water hydraulic control valve with the lower noise and lower vibration. Meantime, the structural parameters are optimized on the basis of information obtained from simulation. Static test, dynamic test and life test are accomplished, and the results show that the water hydraulic directional valve possesses good property, its pressure loss is 1.1 MPa lower, switching time is shorter than 0.025 s, and its strike crest is 0.8 MPa lower. The valve possess fine dynamic performance with the characteristic rapidly action and lower implusion.

关键词： water hydraulic directional valve structure optimization flow field analysis

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FORCE FEEDBACK DATAGLOVE BASED ON PNEUMATIC ARTIFICIAL MUSCLES

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 588-593页

作者： BAO Gang SUN Zhongsheng wang zuwen Pneumatic Center Harbin institute of Technology Harbin 150001 China

An exoskeleton force feedback dataglove is developed, which uses the pneumatic artificial muscles as actuators. On the basis of the simplified hand model, the motion equation is deduced according to the theory of Denavit-Hartenberg. The model of the equivalent contact forces exerted by the object on the finger is proposed. By the principle of virtual work, the static equilibrium of finger is established. The force Jacobian matrix of finger is calculated, and then the joint torques of the finger when grasping objects are obtained. The theory and structure of the force feedback datagolve are introduced. Based on the theory of motion stabilization of four-bar linkage, the flexion angles of joints are measured. The torques on finger joints caused by the output forces of pneumatic artificial muscles are calculated. The output forces of pneumatic artificial muscle, whose values are controlled by its inner pressure, can be calculated by the joint torques of the finger when grasping objects. The arms of force, driving torques and the needed output forces of pneumatic muscle are calculated for each joint of the index finger. The criterion of output force of pneumatic muscle is given.

关键词： Force feedback dataglove Pneumatic artificial muscles Principle of virtual work Force Jacobian matrix

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DOUBLE LOOP ACTIVE VIBRATION CONTROL OF PNEUMATIC ISOLATOR WITH TWO SEPARATE CHAMBERS

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 610-613页

作者： YANG Qingjun LI Jun wang zuwen Department of Fluid Control and Automation Harbin Institute of Technology Harbin 150001 China College of Electromechanics and Materials Engineering Dalian Mantime University Dalian 116026 China

A newly designed pneumatic spring with two separate chambers is promoted and double-loop active control is introduced to overcome the following drawbacks of passive pneumatic isolation： ① The low frequency resonances introduced into the system; ② Conflict between lower isolation frequency and stiffness high enough to limit quasi-static stroke;③ Inconsistent isolation level with different force load. The design of two separate chambers is for the purpose of tuning support frequency and force independently and each chamber is controlled by a different valve. The inner one of double-loop structure is pressure control, and in order to obtain good performance, nonlinearities compensation and motion flow rate compensation （MFRC） are added besides the basic cascade compensation, and the influence of tube length is studied. The outer loop has two functions： one is to eliminate the resonance caused by isolation support and to broaden the isolation frequency band by payload velocity feedback and base velocity feed forward, and the other is to tune support force and support stiffness simultaneously and independently, which means the support force will have no effect on support stiffness. Theoretical analysis and experiment results show that the three drawbacks are overcome simultaneously.

关键词： Pneumatic isolator Active vibration control Double-loop control Two separate chambers Mass flow rate compensation (MFRC)

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Effect of Manufacturing Errors on Static Characteristics of Externally Pressurized Spherical Air Bearings

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Chinese Journal of Mechanical Engineering 2009年第6期22卷 896-902页

作者： REN Di wang zuwen YANG Qingjun BAO Gang School of Mechanical and Electrical Engineering Harbin Institute of Technology Harbin 150001 China Transportation and Logistics Engineering College Dalian Maritime University Dalian 116026 China

Externally pressurized spherical air bearings are the key component of the three-axis air bearing table, and the manufacturing errors of the bearing affects the performance of the air bearing table. However, the manufacturing errors are unavoidable, and the pursuit to enhance the manufacturing accuracy will increase the cost greatly. In order to provide some theoretical guideline for the tolerance choice in the design of the externally pressurized spherical air bearings with inherent compensation, the effects of several manufacturing errors on the static characteristics of the air bearing are studied. Due to the complex geometry of the computational domain, an unstructured meshing technology is used for mesh generation. A finite-volume method is adopted to discretize the three-dimensional steady-state compressible Navier-Stokes equations. A modified SIMPLE algorithm which is suitable for compressible flows is applied to solve the discretized governing equations. The effects of the dimension error and the roundness error of the ball head and the ball socket on the static characteristics are investigated. The investigation result shows that the positive dimension error and the oblate spheroid-type roundness error of the ball head as well as the negative dimension error and the prolate spheroid-type roundness error of the ball socket can improve the bearing capacity and static stiffness of the air bearings by reducing the mass flow. The calculation method proposed in this paper fits well for the general principle, which can be extended to the characteristics analysis of other air bearings.

关键词： externally pressurized spherical air bearings manufacturing errors bearing capacity static stiffness mass flow

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ANALYTICAL SOLUTION OF FILLING AND EXHAUSTING PROCESS IN PNEUMATIC SYSTEM

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Chinese Journal of Mechanical Engineering 2006年第1期19卷 50-54页

作者： JIN Yingzi YANG Qingjun wang zuwen ZHANG Jianci Zhejiang Province Key Laboratory of Textile Machinery Zhejiang SCI-TECH University Hangzhou 310018 China Department of Mechanical Engineering Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering Dalian Maritime University Dalian 116026 China Quzhou College Quzhou 324000 China

The filling and exhausting processes in a pneumatic system are involved with many factors, and numerical solutions of many partial differential equations are always adapted in the study of those processes, which have been proved to be troublesome and less intuitive. Analytical solutions based on loss-less tube model and average friction tube model are found respectively by using fluid net theory, and they fit the experimental results well. The research work shows that： Fluid net theory can be used to solve the analytical solution of filling and exhausting processes of pneumatic system, and the result of loss-less tube model is close to that of average friction model, so loss-less tube model is recommended since it is simpler, and the difference between filling time and exhausting time is determined by initial and final pressures, the volume of container and the section area of tube, and has nothing to do with the length of the tube.

关键词： Pneumatic system Filling and exhausting processes Fluid net theory Analytica 1 solution Loss-less tube model Filling time and exhausting time

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救助打捞装备现状与发展

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机械工程学报 2013年第20期49卷 91-100页

作者：王祖温大连海事大学大连116026

救助打捞是国家应急保障体系的重要组成部分,承担着我国海上人命、财产、环境救助、沉船沉物打捞及其他对海上运输和海上资源开发提供安全保障等多项任务。加强救助打捞装备技术研究,是提高救助打捞综合能力的根本,是国家发展战略的重... 详细信息

救助打捞是国家应急保障体系的重要组成部分,承担着我国海上人命、财产、环境救助、沉船沉物打捞及其他对海上运输和海上资源开发提供安全保障等多项任务。加强救助打捞装备技术研究,是提高救助打捞综合能力的根本,是国家发展战略的重要构成。救助打捞装备专业性强,具有在高海况和大深度条件下工作可靠的适应性特点,同时又是诸多陆上装备向海上和水下发展的延伸,存在相通之处。救助打捞装备交叉机械、电气、流体、微电子、材料等多学科,其关键共性技术又不仅仅局限于救助打捞领域,在海上运输、海洋油气开发、海洋勘探、军事等领域均有应用。以救助船舶、救助飞机、海上搜寻装备、溢油处置装备等代表性的救助装备和打捞工程船、攻千斤装备、水下作业装备、饱和潜水装备、起浮装备等代表性的打捞装备为对象,分析该领域国内外发展现状和趋势,提出救助打捞装备面临的关键技术问题,为我国救助打捞装备的发展战略研究提供参考。

关键词：救捞打捞研究与进展

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Research on Pressure Characteristics of a Vehicle Shift Hydraulic System Based on AMESim

Research on Pressure Characteristics of a Vehicle Shift Hydr...

引用

第36届中国控制会议

作者： Qihui Zhang Wei Xiong Haitao wang Guangfeng Guan zuwen wang Qinghui Xiong Ship Electromechanical Equipment Institute DaLian Maritime University Vehicle Transmission Key Laboratory China North Vehicle Research Institute

ISBN: (纸本)9781538629185

Hydraulic system of vehicle shift is an important part of the vehicle automatic shift control *** affects the quality of the *** order to research the characteristics of the hydraulic system of vehicle shift,a model was established based on *** correctness of the simulation model is verified by building a single hydraulic circuit test *** and experiment show that the system can shift in 1,03 s,and the shift process is stable and has good shift quality.

关键词： AMESim Pressure Characteristics Vehicle Shift Hydraulic System

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静压气体轴承超声速现象的研究与发展

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机械工程学报 2006年第1期42卷 6-10页

作者：王祖温孙昂大连海事大学机电与材料工程学院大连116026

简述了静压气体轴承的类型及发展,回顾了静压气体润滑轴承中超声速流动现象的理论与试验研究,比较分析了它们的特点与不足,指出供气压力低、承载能力小是传统气体轴承不可克服的缺点。根据气体动力学理论和已进行的相关试验。详细分析... 详细信息

简述了静压气体轴承的类型及发展,回顾了静压气体润滑轴承中超声速流动现象的理论与试验研究,比较分析了它们的特点与不足,指出供气压力低、承载能力小是传统气体轴承不可克服的缺点。根据气体动力学理论和已进行的相关试验。详细分析了超声速静压气体润滑轴承的性能优势,即没有供气压力的限制,承载能力可以随供气压力的提高成比例提高。计算流体力学的发展为超声速气体轴承的研究提供了有力的技术工具,根据气体轴承内各段不同的流动特点,采用分场计算的方法可以得到精确的气体润滑模型,最后指出了超声速静压气体轴承将成为气体轴承的一个新的发展方向。

关键词：气体润滑轴承超声速

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高速气缸自适应缓冲原理研究

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机械工程学报 2005年第7期41卷 221-224,230页

作者：李哲王祖温包钢哈尔滨工业大学气动技术中心哈尔滨150001

对高速气缸缓冲腔系统能量进行了深入的理论分析,提出了“两个线性关系的假设”和基于“两个假设”的自适应缓冲原理。针对活塞基准速度为3m/s,速度波动10%的高速气缸,通过对基于此原理的自适应缓冲系统的仿真研究和试验研究,证明“两... 详细信息

对高速气缸缓冲腔系统能量进行了深入的理论分析,提出了“两个线性关系的假设”和基于“两个假设”的自适应缓冲原理。针对活塞基准速度为3m/s,速度波动10%的高速气缸,通过对基于此原理的自适应缓冲系统的仿真研究和试验研究,证明“两个线性关系的假设”是成立的,自适应缓冲原理是正确的,为解决工况条件变化的高速气缸的缓冲问题奠定了坚实的理论基础。

关键词：高速气缸系统能量缓冲原理压力反馈

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静压气体轴承静刚度的动态测试新方法

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机械工程学报 2007年第4期43卷 21-26页

作者：郭良斌王祖温武汉科技大学城市建设学院武汉430070 大连海事大学机电与材料工程学院大连116026

以环面节流静压气体球轴承为例,建立轴承动静态刚度与气膜位移-动态力频响函数的数学模型;借助数学分析和数值试验,从理论上揭示了轴承气膜位移-动态力频响函数与气膜静刚度、动刚度之间的联系,指出静压气体轴承静刚度的测量可以通过测... 详细信息

以环面节流静压气体球轴承为例,建立轴承动静态刚度与气膜位移-动态力频响函数的数学模型;借助数学分析和数值试验,从理论上揭示了轴承气膜位移-动态力频响函数与气膜静刚度、动刚度之间的联系,指出静压气体轴承静刚度的测量可以通过测量低频下气膜频响函数的幅频特性来代替。介绍球轴承气膜幅频特性测试装置的工作原理及测试系统固有模态对测试结果的影响。实测结果表明,静压气体轴承静刚度的动态测试新方法是正确可行的,气膜与承载质量构成的本质非线性二阶振动系统,其低频段的动态刚度数值仍然等于该工作点处的静刚度。新的测试方法,能够实现轴承静态刚度的在线自动测试,提高静刚度的测试精度和效率;将激振频率扩展到机械系统通常涉及的频段后,可以同时得到轴承的动静态刚度和气膜位移-动态力的幅频特性,这对于气体轴承稳定性及精密轴系动态性能的研究具有重要的意义,是轴承的静态测试所无法实现的。

关键词：静压气体轴承静态刚度动态刚度幅频特性

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