HYDRAULIC ACTIVE GUIDE ROLLER SYSTEM FOR HIGH-SPEED ELEVATOR BASED ON FUZZY CONTROLLER

Increase of elevator speed brings about amplified vibrations of high-speed elevator. In order to reduce the horizontal vibrations of high-speed elevator, a new type of hydraulic active guide roller system based on fuzzy logic controller is developed. First the working principle of the hydraulic guide system is introduced, then the dynamic model of the horizontal vibrations for elevator cage with active guide roller system and the mathematical model of the hydraulic system are given. A fuzzy logic controller for the hydraulic system is designed to control the hydraulic actuator. To improve the control performance, preview compensation for the controller is provided. Finally, simulation and experiments are executed to verify the hydraulic active guide roller system and the control strategy. Both the simulation and experimental results indicate that the hydraulic active guide roller system can reduce the horizontal vibrations of the elevator effectively and has better effects than the passive one, and the fuzzy logic controller with preview compensation can give superior control performance.

Analysis and Optimization of Inside-Cushion Structure in High-Speed Hydraulic Cylinders

An inside-cushion structure with sidestep and taper-shaped plungers is studied to address the problems of high impact and vibration in high-speed hydraulic cylinders.First,the three stages of cushion processes are discussed according to the varying flow area as the piston moves.Then,to establish a precise mathematical model,the states of the flow field are estimated in terms of the Reynolds number.Accordingly,the simulation model parameterized against measured data is developed and verified by experiment.Last,the average velocity,peak cushion pressure,and terminal velocity are defined to evaluate cushion performance.According to these optimized objectives,the non-linear programming by quadratic Lagrange(NLPQL)algorithm is applied to optimize the structure parameters.The optimization results indicate that the peak cushion pressure is reduced by 28%and terminal velocity is reduced by 21%without reduction of average velocity.

Position Control Optimization of Aerodynamic Brake Device for High-speed Trains

The aerodynamic braking is a clean and non-adhesion braking, and can be used to provide extra braking force during high-speed emergency braking. The research of aerodynamic braking has attracted more and more attentions in recent years. However, most researchers in this field focus on aerodynamic effects and seldom on issues of position control of the aerodynamic braking board. The purpose of this paper is to explore position control optimization of the braking board in an aerodynamic braking prototype. The mathematical models of the hydraulic drive unit in the aerodynamic braking system are analyzed in detail, and the simulation models are established. Three control functions--constant, linear, and quadratic--are explored. Two kinds of criteria, including the position steady-state error and the acceleration of the piston rod, are used to evaluate system performance. Simulation results show that the position steady state-error is reduced from around 12-2 mm by applying a linear instead of a constant function, while the acceleration is reduced from 25,71-3.70 m/s2 with a quadratic control function. Use of the quadratic control function is shown to improve system performance. Experimental results obtained by measuring the position response of the piston rod on a test-bench also suggest a reduced position error and smooth movement of the piston rod. This implies that the acceleration is smaller when using the quadratic function, thus verifying the effectiveness of control schemes to improve to system performance. This paper proposes an effective and easily implemented control scheme that improves the position response of hydraulic cylinders during position control.

Development of High-Speed On-Of Valves and Their Applications

With the widespread application of the computer and microelectronic technology in the industry,digitization becomes the inevitable developing trend of the hydraulic technology.Digitization of the hydraulic components is critical in the digital hydraulic technology.High-speed on-of valves(HSVs)which convert a train of input pulses into the fast and accurate switching between the on and of states belong to widely used basic digital hydraulic elements.In some ways,the characteristics of the HSVs determine the performance of the digital hydraulic systems.This paper discusses the development of HSVs and their applications.First,the HSVs with innovative structures which is classifed into direct drive valves and pilot operated valves are discussed,with the emphasis on their performance.Then,an overview of HSVs with intelligent materials is presented with considering of the switching frequency and fow capacity.Finally,the applications of the HSVs are reviewed,including digital hydraulic components with the integration of the HSVs and digital hydraulic systems controlled by the HSVs.

孔面积变化对孔盘式水力测功器影响的数值分析

为了探究静转子孔面积变化对孔盘式水力测功器性能的影响,利用数值计算的方法,对现有孔盘式水力测功器在不同孔面积条件下的内部流动过程进行分析,得到水力测功器腔室内部的流场和温度场,对比水力测功器进出口温差、流量、扭矩以及吸收功率等参数的变化。结果显示:静转子孔面积的增加会导致水力测功器进出口温差的增大,且大致呈线性关系,而流量的变化幅度较小,维持在20%以内。扭矩与吸收功率随孔面积增加而增大,且增大幅度逐渐减小,孔面积变化的影响不断减弱。

基于改进GAN的水力测功器轴承故障在线诊断方法

基于数据驱动的轴承故障诊断方法已成为轴承故障诊断领域研究的重点,但由于水力测功器轴承故障情况极少,导致基于数据驱动的轴承故障诊断准确率低。针对上述问题,提出了一种基于改进生成对抗神经网络(generative adversarial networks,GAN)的水力测功器轴承故障在线诊断方法,首先对生GAN训练方法进行改进,用改进的GAN交替训练判别器和生成器学习原始数据的分布特性,建立了水力测功器轴承故障数据增强模型得到合成数据。然后结合原始数据和合成数据训练得到基于SVM的轴承故障诊断模型。最后采用该轴承故障诊断模型实现水力测功器轴承故障在线诊断。仿真结果表明,所提出的故障在线诊断方法通过改进GAN增强训练极大提升了轴承故障诊断的实时准确率,并具有抗噪声干扰性强的特点。

采煤机摇臂加载装置发展现状与趋势

分析了现有摇臂加载装置的工作原理和技术特点,针对摇臂加载装置绿色节能、加载功率覆盖范围广和自动化程度高的发展要求,设计了新型摇臂加载装置。采用电反馈式、双电机布置的加载方案,加载功率范围广,具有数据自动采集、设备健康监测和安全防护监控功能,提高了摇臂加载测试能力与检验水平,有助于提升产品品质。

HS-X型水力测功机装用的飞轮装置维修探索

HS-X型水力测功机装用的飞轮装置在发动机试车时,出现飞轮装置轴承温度报警故障,进行了飞轮装置的分解、故障检查及检测、修理、装配、调试。发现轴承损伤、尺寸不合格是飞轮装置轴承超温的主要原因。通过采取更换轴承、重新调整飞轮装置轴承配合、调整转子组件跳动量、动平衡等方式,完成了飞轮装置的国内自主维修保障。

基于转速跟踪预处理和CNN的水力测功器轴承故障诊断方法

高速、重载的复杂环境中,易导致水力测功器轴承故障多发,为准确诊断其轴承故障状态的问题,提出了一种基于转速跟踪处理和卷积神经网络(CNN)的水力测功器轴承故障诊断方法。首先,对振动数据进行转速跟踪预处理,以解决变转速情况下的特征提取问题;然后,对预处理后的信号进行快速傅里叶变化提取故障频谱特征,以频域信号生成汉克矩阵,并将其作为模型的原始特征输入训练卷积神经网络故障诊断模型;最后,采用训练好的轴承故障诊断模型实现水力测功器轴承故障在线诊断。仿真结果表明,所提出的基于转速跟踪处理和卷积神经网络的水力测功器模型是可行和有效的,并具有较好的泛化能力,能够准确、有效地诊断轴承的故障状态。

高速水力测功机修理研究

高速水力测功机是涡轴发动机试车台的重要设备,因长期处于超负荷运转状态,近年来该设备故障频发。文章主要研究高速水力测功机装配技术和零件修复技术,如轴承与轴承座和轴的配合研究,轴承座和轴的修复;在测功机水腔密封环(密封衬套)损磨严重的情况下,密封衬套的修复;轴承润滑密封结构(篦齿和前、后密封衬套)和对应的损坏件修复;测功机装配工艺。本研究旨在通过深入分析,为高速水力测功机的维护提供有益的参考和指导。

交流变频技术在液黏测功机控制系统中的应用

把交流变频调速技术应用于液黏测功机的液压系统,通过控制电机频率调节泵的输出转速,从而改变泵的流量,根据实验测出液黏测功机润滑油压和控制油压的频率-油压(f-p)关系曲线,找出测功机加载的最佳润滑油压和控制油压的频率范围。解决了传统电液比例调节容易发生卡滞和跳跃性输出的问题;实现平稳可控加载;提高了系统的使用寿命和可靠性,还达到了节能的目的。

微型燃气轮机向心透平性能试验装置与测量系统

为开发100 kW微型燃气轮机,自主设计建造了高速高精度向心透平性能试验装置。对其主体部分的关键问题,如转子支撑、动平衡等,进行了深入分析与探讨。试验台功率吸收装置采用高速水力测功器,最高转速为50 000 r/min,最大吸收功率150 kW。针对水力测功器标定系统的不足,给出了一种简单实用的解决方案,并对水力测功器力传感器进行了标定。对该试验台向心透平总静效率的测量误差及其影响因子进行了分析。结果表明:效率极限误差为±0.011 4,流量对效率误差的影响因子要较其它物理量大,因而应尽可能提高流量的测量精度。

车用涡轮增压器涡轮测功方法的发展

根据测功原理的不同,对车用涡轮增压器涡轮测功方法进行了分类,介绍了各种测功方法的工作原理,结构特点和发展概况。

水力测功器模拟螺旋桨高海情负载的神经网络预测控制仿真研究

为解决用水力测功器实现螺旋桨高海情下动态负载模拟的难题,首先给出了问题的数学描述并从工程应用角度做了适当简化,完成了开环辨识试验和神经网络建模;然后基于模型预测控制的基本原理进行了水力测功器模拟螺旋桨高海情负载的神经网络预测控制研究;仿真研究结果证明,文中所提方法确实有效,可用于水力测功器建模及动态加载控制。

水力测功器转矩控制器的设计与试验研究

从理论上对发动机水力测功器试验台架中负载转矩的有效控制问题进行了深入研究,基于P87LPC769完成了转矩控制器的硬件设计,在借助工控机及Matlab/RTW实时仿真控制平台进行控制策略调试的基础上,完成了控制器软件设计,配机试验结果表明了转矩控制器及其控制策略的有效性。

高速燃驱一拖二机组动力学特性分析

某型高速燃驱一拖二机组(高速动力涡轮-1#水力测功机-2#水力测功机)轴系支撑系统结构复杂,由结构钢架和基座组成,支撑系统刚度与轴承刚度接近,弹性不能忽略。本文基于传递矩阵法建立了复杂转子-轴承-基座系统转子动力学模型,分析了复杂耦合支撑系统三种结构的动力特性,并根据API617标准对三种支撑下的转子稳定性进行了动力学评价,为该类机组的现场动平衡提供参考和依据。

水力测功器转子装配过程仿真分析

用ANSYS分析软件对水力测功器转子的装配过程进行了仿真研究 ,探讨了空间复杂几何体的建模方案。根据转子的装配过盈量 ,分析了转子装配时需要的加热温度以及转子装配好以后在转子中所产生的应力 ,同时还考虑到转子内圆键槽的不同设计方案 ,又分多种工况进行了分析计算 。

基于CFD技术汽车用热交换器流场特性建模分析

换热器是最常用的车辆液压油液冷却机构,其是保证齿轮传动机构正常运转的重要结构单元。针对车辆液压油常用的间壁式换热器进行分析,对热交换原理进行分析,获取传热方程和热平衡方程;基于此对热交换过程的固流耦合进行分析,获得热交换器的数学模型;根据数学模型和使用需求,对热交换器的参数进行设计;基于热交换器参数建立三维模型,采用CFD建立流场分析模型,对热交换器内油液和冷却液的速度场、温度场等进行分析;基于水力测功机试验台,对实际热交换器的冷却效果进行分析,验证设计和流场分析结果的准确性。结果可知:流过热交换器后,冷却液的速度流量变化较大,5.2m^(3)/s降低至2.3m^(3)/s,而油液的速度流量基本无变化,基本保持在2.0m^(3)/s,这与热交换器内部结构密切相关;仿真经过29s达到平衡状态,冷却液温度稳定在88.5℃,而油液温度稳定在95.5℃;试验测试温度变化趋势与仿真分析结果基本一致,冷却液温度逐渐升高,30s后达到平衡,达到83.3℃,而油液温度逐渐降低,31s后也达到平衡,为90.5℃;试验测试与仿真分析参数对比,油液与冷却液的出口温差基本一致,误差控制在7%以内,且达到平衡状态时的所经历的时间基本一致,在30s左右;且温度符合设计要求,表明设计方案的可靠性与准确性,为此类分析提供参考。

柴油机综合性能动态测试系统研制

介绍了柴油机综合性能测试系统的结构、原理和性能参数。为了能在1个试验平台上安装不同型号的柴油机,设计了三维可调多用平台,能在x、y、z3个方向无级调节安装尺寸。针对多种型号柴油机的转矩和油耗测量范围宽、测量精度不易保证的问题,采用现场标定的方法,使仪表精度符合技术要求。该系统可用于测试油田大修的多种型号柴油机的性能。

截割部减速器水力测功试验加载系统研究

本文介绍了一种截割部水力测功试验加载系统,分析了系统主参数确定的依据。设计得到实用验证。