从系统发热说顺序阀和平衡阀的区别

从一起系统发热说起,分析发热的原因,找到解决问题的办法,说明顺序阀和平衡阀的区别。     

逻辑阀在阀门液压驱动装置中的应用

介绍逻辑阀在阀门液压驱动装置中的应用及选型注意事项。     

起重机电比例泵控液压系统性能研究

阐述了一种大吨位汽车起重机电比例泵控液压系统,介绍了其液压原理,并从节能、高效、可靠、微动性好、动作平稳、复合动作质量高等作业性能方面进行了分析,现已批量投入生产。     

电液伺服控制装置的研发探讨

针对电液伺服控制装置在常规运行中电液伺服阀的堵、卡、零偏、断线等容易产生的误动作问题,对电液伺服控制装置的开发、改进做了一些相关的探讨,以期提高机组的控制水平,优化机组流程配置,降低机组运行成本,提高机组运行的安全可靠性。     

基于波形分析的大众汽车网络系统故障诊断

针对汽车网络系统故障诊断相对复杂的问题,对大众帕萨特车型网络传输系统动力CAN线和舒适CAN线的断路、短路、线路交叉等故障波形进行了研究,对网络系统CAN线的故障诊断方法和思路进行了归纳,对故障波形产生机理作了详细解释,提出了示波仪配合诊断仪选取合适测量点检测网络系统故障的思路,利用VAS6356示波仪与VAS6150诊断仪对大众帕萨特车型的CAN线上传输信号进行了测试。研究结果表明,检测位置对动力CAN线的断路故障、线路带电阻故障和舒适CAN线的断路故障波形捕捉会产生一定影响,通过正确选择检测位置能够迅速捕捉到故障波形并及时找到故障点,对网络传输系统的故障诊断具有重要意义。     

CO2固定式灭火系统遥控阀组的设计

阐述了CO2固定式灭火系统遥控阀组的组成、技术参数和设计。     

Nonlinear modeling and identification of the electro-hydraulic control system of an excavator arm using BONL model

Electro-hydraulic control systems are nonlinear in nature and their mathematic models have unknown parameters. Existing research of modeling and identification of the electro-hydraulic control system is mainly based on theoretical state space model, and the parameters identification is hard due to its demand on internal states measurement. Moreover, there are also some hard-to-model nonlinearities in theoretical model, which needs to be overcome. Modeling and identification of the electro-hydraulic control system of an excavator arm based on block-oriented nonlinear（BONL） models is investigated. The nonlinear state space model of the system is built first, and field tests are carried out to reveal the nonlinear characteristics of the system. Based on the physic insight into the system, three BONL models are adopted to describe the highly nonlinear system. The Hammerstein model is composed of a two-segment polynomial nonlinearity followed by a linear dynamic subsystem. The Hammerstein-Wiener（H-W） model is represented by the Hammerstein model in cascade with another single polynomial nonlinearity. A novel Pseudo-Hammerstein-Wiener（P-H-W） model is developed by replacing the single polynomial of the H-W model by a non-smooth backlash function. The key term separation principle is applied to simplify the BONL models into linear-in-parameters struc~tres. Then, a modified recursive least square algorithm（MRLSA） with iterative estimation of internal variables is developed to identify the all the parameters simultaneously. The identification results demonstrate that the BONL models with two-segment polynomial nonlinearities are able to capture the system behavior, and the P-H-W model has the best prediction accuracy. Comparison experiments show that the velocity prediction error of the P-H-W model is reduced by 14%, 30% and 75% to the H-W model, Hammerstein model, and extended auto-regressive （ARX） model, respectively. This research is helpful in controller design, system monitoring and diagnosis.     

2D阀控单出杆激振缸低频特性研究

针对传统电液激振器振动频率难以提高的现状,提出了一种基于差动连接的2D阀控单出杆液压缸的新型电液激振器。阐述了激振器的工作原理,建立了数学模型并进行了仿真分析,设计了电液激振器并进行了实验研究。理论和实验结果表明:振动频率在5Hz以下工作时,激振器输出的振动波形容易出现饱和现象;随着频率的提高,饱和现象就不容易出现。激振器输出力的大小与2D阀的轴向开口成正比关系,轴向开口越大,输出的力越大。     

Research on the dynamic characteristics of water hydraulic servo valves considering the influence of steady flow force

The International Thermonuclear Experimental Reactor remote-handling (ITER-RH) system powered by water hydraulics is a vision of the future. The 2D servo valve is a new type of servo valve, maybe suitable for the ITER-RH system. It has many advantages, including its fast response and strong anti-pollution ability. However, steady flow force is currently considered to be one factor that impacts the dynamic characteristics of servo valves. In this study, the influence of steady flow force on the dynamic characteristics was analyzed, and the structure was optimized accordingly. A mathematical model of the servo valve was built using theoretical analysis and numerical simulation. Results indicated that the amplitude bandwidth of the 2D water hydraulic servo valve was 169 Hz without considering the steady flow force, and it decreased to 162 Hz when the steady flow force was considered. Furthermore, a newly designed valve sleeve, to compensate for the axial steady flow force, was proposed by changing the angle of the inlet port designed in the valve sleeve to the spool axis. The maximum compensation capacity of the axial steady flow force was 35%, and the best angle of the inclined holes was approximately 120°. The optimized amplitude bandwidth of the 2D servo valve was 167 Hz. The results demonstrate that the optimized valve sleeve improved the dynamic response of the 2D servo valve.     

步进式加热炉电液比例泵缸系统仿真与应用

非对称泵缸系统多用于变速场合，这种泵缸系统多为本质非线性、时变、强干扰系统。本文用PID控制实现电液斜盘位置和流量的控制，使系统的不确定性和非线性等得到补偿。仿真和实验表明，所开发的PID控制器能够较好地实现模型跟踪控制，跟踪性能有较大改善。     

基于CMAC与PID复合控制算法的液压缸装配专用设备电液伺服系统的研究

构建了液压缸装配专用设备电液伺服系统的数学模型,提出基于CMAC与PID复合控制算法的控制策略,克服传统PID控制存在的参数很难自整定、系统超调量过大、动态响应速度过慢等问题。仿真分析表明,采用CMAC与PID复合控制算法具有很好的控制效果,可以提高系统的动态特性,减小系统的超调量,增强系统的稳定性。     

ASME&RCC-M核电阀门疲劳分析的探讨

论述了核电阀门设计规范ASME和RCC-M在疲劳分析上的差异。     

大吨位电液锤的液压控制系统及其动态性能分析

针对太原科技大学开发的0.5t悬臂式电液锤新型液压系统存在供油量无法满足大吨位电液锤流量要求的问题,采用了一个具有高压、大流量、响应快、液阻小的二通插装阀,实现了大吨位电液锤液压控制系统供油量的改进,解决了系统中的流量瓶颈问题,实现了用小尺寸的主控手动换向阀就可控制大吨位电液锤的目的。仿真结果表明,新型液压控制系统能满足大吨位电液锤的供油量。     

Global dynamic modeling of electro-hydraulic 3-UPS/S parallel stabilized platform by bond graph

Dynamic modeling of a parallel manipulator(PM) is an important issue. A complete PM system is actually composed of multiple physical domains. As PMs are widely used in various fields, the importance of modeling the global dynamic model of the PM system becomes increasingly prominent. Currently there lacks further research in global dynamic modeling. A unified modeling approach for the multi-energy domains PM system is proposed based on bond graph and a global dynamic model of the 3-UPS/S parallel stabilized platform involving mechanical and electrical-hydraulic elements is built. Firstly, the screw bond graph theory is improved based on the screw theory, the modular joint model is modeled and the normalized dynamic model of the mechanism is established. Secondly, combined with the electro-hydraulic servo system model built by traditional bond graph, the global dynamic model of the system is obtained, and then the motion, force and power of any element can be obtained directly. Lastly, the experiments and simulations of the driving forces, pressure and flow are performed, and the results show that, the theoretical calculation results of the driving forces are in accord with the experimental ones, and the pressure and flow of the first limb and the third limb are symmetry with each other. The results are reasonable and verify the correctness and effectiveness of the model and the method. The proposed dynamic modeling method provides a reference for modeling of other multi-energy domains system which contains complex PM.     

2D阀控电液激振器的优化设计和实验研究

为了进一步提高电液激振器的激振频率和控制精度,并降低其加工和安装难度,提出了2D高频激振阀的新结构和控制方法。通过增加2D阀阀芯沟槽与阀套窗口的沟通次数,改进与无刷直流伺服电机连接的高速齿轮箱传动机构,设计混合式直线步进电机与堵头连接以控制阀芯轴向位移,实现了对2D高频激振阀的结构优化。经理论以及实验研究表明：新型2D高频激振阀的结构简单,控制精度高,激振频率最高可达3000Hz。     

液压柔性机械臂等效模型的鲁棒控制

针对液压柔性机械臂的等效动力学模型——柔性负载电液位置伺服系统,提出了滑模控制和自适应反演控制相结合的鲁棒控制器设计方法。基于Lyapunov稳定性理论的系统稳定性分析,证明系统跟踪误差将收敛至零,同时控制了柔性负载的振动。仿真实例表明了设计方法的正确性。     

YZC18型振动压路机液压系统的设计与分析

针对YZC18型振动压路机采用的全液压传动进行了较为全面的分析研究.论述了YZC18型振动压路机全液压系统的方案选择、行走液压系统和振动液压系统工作原理及不同点.对于当前全液压系统在工程机械中的应用进行了尝试和探索,对于同类型产品的设计具有一定的指导作用.     

对称四通阀控非对称液压缸动态分析

转向系统是大型平板车行驶的核心部件。对由对称阀控非对称液压缸组成的转向系统的动态特性进行研究,应用Matlab所提供的Simulink进行建模、仿真,为转向系统设计提供参考。     

超大断面矩形盾构电液控制集成技术研究

由超大断面矩形盾构的工况提出了相应的液压控制系统原理图,根据控制原理建立了系统的数学模型、控制系统方框图,并给出了控制系统传递函数;利用AMESim仿真软件对该系统进行了仿真分析和得出了相应结论。     

基于虚拟仪器的微小型二维液压泵测试系统的开发

微小型液压元件是航空航天、机器人等高端装备中的关键零部件,其研制与开发是目前流体传动与控制领域的重点研究方向之一。为检测新型微小型二维液压泵的性能指标,以微小型二维活塞泵作为测试对象,采用并行式能量回收和多机同步测试方法,设计了基于LabVIEW平台的微小型二维液压泵的性能试验系统。该测试系统以数据采集卡作为信号中端,进行高精度数据采集和控制信号输出;引入模块化设计方法,可缩短测试软件开发周期,方便扩展功能;实现实时监控及测试参数远程调节,可完成排量验证、效率和密封检查等各项性能试验,并且具备自动生成特性曲线,试验完成后保存试验数据和图表信息,制作试验报告等功能。