液压系统CAT应用研究

液压系统的传统测试方法存在许多缺点 ,不能适应液压技术发展的需要。为此提出在节流调速系统中采用计算机辅助测试 ( CAT)的方案。设计了系统硬件与软件。实际测试表明 :该CAT系统具有测试精度高、速度快、测试准确等优点 ,提高了液压系统的测试水平。     

基于LabVIEW的液压系统监测系统

本设计选用道砟清筛机的液压系统为研究对象,道砟清筛机是铁道线路养护的主要机械且道砟清筛机的主要工作部件工作形式主要是液压传动。本设计应用Lab VIEW编程软件编程开发液压系统的监测系统,该监测系统实现对液压系统中能反映液压系统工作状态的有效信号进行实时采集、显示、保存、读取、分析与处理,若液压系统出现异常,及时发出故障报警信号。     

变频液压技术在泵测试系统中的应用

本文介绍了变频液压技术的原理及其在泵测试系统中的运用,解决了泵测试系统中转速调节存在的问题,提高了调速精度和系统稳定性,达到了节能的要求。     

液压动力转向系统性能分析与优化设计

液压动力转向系统其转向的轻便型和高速行车时的稳定性是一对矛盾,传统的液压动力转向系统无法实现随车速变化而作出必要的精确调节,因此无法兼顾低速时的加力效果和高速时车辆行驶的稳定性,故有必要对传统的机械液压动力转向系统进行优化设计以改善其使用性能。     

液压动力转向系统性能分析与优化设计

液压动力转向系统其转向的轻便型和高速行车时的稳定性是一对矛盾,传统的液压动力转向系统无法实现随车速变化而作出必要的精确调节,因此无法兼顾低速时的加力效果和高速时车辆行驶的稳定性,故有必要对传统的机械液压动力转向系统进行优化设计以改善其使用性能。     

微机控制液压制动器试验系统

微机控制液压制动器试验系统是为液压制动器产品开发提供设计参数，介绍了系统的工作原理和系统功能。     

基于多传感器信息融合的焦煤机械液压系统故障诊断研究

为提高焦煤机械液压系统的使用效率和可靠性,文章在分析焦煤机械液压系统故障特征的基础上,提出了一种基于多传感器信息融合的故障诊断系统,大大提高了故障诊断的效率与准确度.     

数字图象处理技术在液压系统故障诊断中的应用

经对液压系统污染磨损理论的研究，通过实验验证，介绍一种新的液压系统故障诊断的方法。     

基于多系统联合仿真技术的液压系统研究

液压泵是液压系统关键的动力元件,液压泵是否与液压控制元件与执行元件相匹配将直接影响到液压系统的效率。运用基于软件接口的方法对液压机构虚拟样机模型进行仿真计算。仿真结果显示,液压缸运行平稳,液压马达的转速在PID控制器的作用下获得良好的工作状态,液压泵的可以在正常工作压力下运行。     

浅析工程机械液压系统的常见问题及维护保养

工程机械工作环境差、使用频率高,液压系统复杂,是最容易出现故障的系统之一,本文重点讲述工程机械液压系统常见故障的分析及维护保养的方法。     

液压系统故障分析及处理

现如今液压系统已经被广泛地应用在生产的各个方面,可以说在人们的生产和生活当中,液压系统已经开始起着十分关键的作用,液压系统有其独特的优点,所以在这种生产环境当中才会越来越受到人们的重视.因为液压技术相对来说发展较晚,因此很多人对于液压元件和液压原理并不熟悉,导致液压系统出现故障便无从下手,本研究基于此主要分析液压系统的故障分析和处理情况,希望所得结果可以为相关领域提供有价值的参考.     

Alternating pressure control system for hydraulic robots

Hydraulics is a promising technology for robots. However, traditional hydraulic infrastructures are often large and power-inefficient, with large power sources that hinder mobility. In contrast, electro-hydrostatic actuators are relatively power efficient, but their cost and weight can be excessive in systems with a higher number of degrees of freedom. In this paper, we propose a new alternating pressure control system for hydraulic systems with a higher number of degrees of freedom based on an alternating pressure source system. In this system, the valves open and close in synchronization with a pump with sensor feedback, allowing either pressure or position in each actuator to be controlled independently. With the proposed system, a centralized pump can be used with simplified tubing and simple on–off valves. Moreover, we developed a dynamic duty ratio system that improves performance and reduces pump utilization time. The experimental results confirmed that both the position and pressure of each actuator can be controlled in parallel on a multi-degree-of-freedom system.     

液压平台控制系统的改造设计与实施

"未来驾驶"展品以6自由度液压平台为运动平台,应用虚拟仿真、虚拟现实技术,让游客体验未来交通工具海陆空三栖驾驶功能.为了提升系统的稳定性和安全性,设计改造了液压油缸的比例伺服阀、急停与保护控制电路、回油管路单向阀等,改造实践后,提升了展品的运行效果.     

某无人机液压起落架系统建模与仿真

某无人机液压系统主要为起落架的收放提供动力源,对其进行建模仿真能够实现参数和方案的优化,以便获得最佳的设计。基于节点法的集中参数数学建模思想,针对液压系统的动态特性仿真问题,研究了在MATLAB／SIMULINK下面向液压元件的液压系统动态特性仿真模型库的建立问题,建立各液压子系统模型。进行无人机液压起落架仿真,得到起落架收放时间短,达到某无人机起落架对响应时间的要求。     

液压系统的绿色设计与制造分析

文章从液压系统的全生命周期出发,以液压系统的五大组成部分为基础进行液压系统的绿色设计与制造,并延伸至液压系统维护维修及报废后的回收与再利用阶段,为液压系统的绿色设计与制造的研究提供有力的理论基础。     

A straight-line motion tracking control of hydraulic excavator system

The Cartesian control of automated excavators has been noted for its difficulty, especially due to severe nonlinearities in hydraulic actuators, which are hardly observed in electric motors. The nonlinearities tend to become even more severe as the size of an excavator increases and the speed of end-effector becomes faster, and conventional controls have been unable to adequately handle nonlinearities to this degree. In a conviction that modern robust controls can resolve this problem, we approached this problem by adopting Time-delay control (TDC) as the baseline control, and by enhancing it with compensators on the basis of insights obtained from the plant dynamics. The resulting control law has been applied to straight-line motions of a 13 ton hydraulic excavator with a bucket (end-effector) speed of 0.5 m/s, a speed level at which skilful operators work. The accuracy achieved was mostly within 3 cm for surfaces with various inclinations and over broad ranges of joint motions, which is far better than that of an expert operator. These promising results not only justify our approach to this problem, but also convince us that we now have an effective means for the control of automated excavator systems.     

基于AMESim的液压锚杆钻机回转系统的建模与仿真

对液压锚杆钻机动力头回转机构的工作原理进行分析,针对回转系统设计过程中液压马达串并联两种工作方式,采用AMESim液压仿真软件对其进行仿真研究。通过分析回转机构的工作原理建立模型,并对串并联方式下的参数进行设置,分析了液压马达串并联状态下马达的转速、压力和输出转矩的动态变化。通过仿真研究发现,液压马达串联状态适合用于载荷较小,转速较大的场合,并联状态比较适用于负载比较大的场合,为液压锚杆钻机回转机构的优化设计和冲击器新产品研发提供了理论基础。     

基于AMESim的工程机械液压系统建模与仿真技术研究

本文在研究了液压系统发展的实际之后,提出了通过AMESim软件对工程机械液压系统进行仿真建模的方式,通过这种方式能够准确、便捷的对液压系统的性能进行预测,并能够对其进行整体的分析与评估。     

基于AMESim的工程机械液压系统建模与仿真技术研究

本文在研究了液压系统发展的实际之后,提出了通过AMESim软件对工程机械液压系统进行仿真建模的方式,通过这种方式能够准确、便捷的对液压系统的性能进行预测,并能够对其进行整体的分析与评估。     

Virtual access hydraulic experiment for system dynamics and controls education

A Virtual Access Laboratory (VAL) for undergraduates is currently being built at Georgia Tech. This laboratory will house a three-degree of freedom, hydraulically actuated device resembling a fork lift truck. Experiments with the hydraulic equipment can be run remotely via the Internet. Such an experimental apparatus will give students exposure to hydraulics, technology that is used expansively in industry, yet lightly treated in most US undergraduate engineering curricula. The software responsible for providing the user interface and controlling the manipulator is comprised of both client and server programs that communicate via the Internet. The client code is written in Java and features a Graphical User Interface to provide a user-friendly environment for students. Code for the server is written in C++ to run on Windows NT with Hyperkernel for deterministic real-time control. This code will offer the students the ability to run experiments such as system identification, PID control, and trajectory planning. A camera monitors the system and provides students with visual data.