In order to achieve this object , this text mainly study lectotype design of spreader leveling hydraulic control system . on the basis of reference and analysis massive existing products parameter 为了达到这一目标,本文在参考和分析大量现有产品参数的基础上进行摊铺机调平液压控制系统的选型设计。
Carlos eduardo jeronymo , hironao yamada , takayoshi muto . adaptive predictive controller for hydraulic system driven by fast - switching on / off solenoid valves [ j ] . jsme international journal , series c , 1996 , 39 ( 3 ) 刘忠,杨襄璧,赵宏强.基于高速开关阀的液压控制系统及其控制方式的应用研究[ j ] .凿岩机械气动工具, 1998 ( 4 )
This paper is focused on the mathematical description of hydraulic control system , in which the hydraulic power comes from variable pump , the actuators are two valve - controlled motors , and the load is purely inertial 摘要探讨了由变数泵为液压源、 2个阀控马达为执行元件以及惯性负载组成的液压控制系统的数学描述，并给出了其线性化模型。
In the last part of the chapter , the research method of the overall thesis is proposed . in chapter 2 , the overall design scheme of electro - hydraulic proportional control system of material testing machine is introduced 第二章介绍了材料试验机负载适应控制系统的总体设计方案，详细介绍了本课题研究开发的主机系统、液压控制系统及电控系统。
As the demand for their high quality and good outline is increasing , the hydraulic control system of molding machine must be able to offer accurate pressure and flow control at the same time to its injection system 集压力、流量比例调节于一体的电液比例压力流量复合控制阀(简称pq阀)以其复合程度高、控制性能好、节能等特点在注塑机液压控制系统中得到了日益广泛的应用。
Secondly , based on the account of hydraulic dynamic factor ( hydro - capacitance and hydro - inductance ) and the analysis of each component ' s math model , the system ' s math models of three situations are established 其次，在充分考虑液压系统的动态因素(液容和液感) ，并对各液压元器件建模分析的基础上，分别建立了速闭闸液压控制系统在泵或蓄能器作用下开启、关闭闸门过程的数学模型。
In addition to military products , criaa designed & manufactured many kinds of industrial products such as ff series servovalves , lpg recovery plant , airport hydrant refuelling equipments , hydraulic pump stations , hydraulic control system and testing equipments , low temperature box with natural air cooling , and air refrigerators used for mines etc 产品除军用外，开发的民品有： ff系列伺服阀、油田气轻烃回收装置、机场栓式加油设备、液压控制系统产品及试验设备、空气制冷低温箱、矿用空气制冷机等。
The products of the joint venture company mainly include : to make full use of the advanced technical stage provided by both parent companies to design for its clients and manufacture air - conditioning systems of all kinds of railway vehicles , such as the air - conditioning systems , hydraulic pressure systems and other accessory products of locomotive , railway passenger , subway , lrv and high - speed train 合资公司的主要产品是：利用双方母公司提供的先进技术为平台，为客户设计、制造各类铁路的车用车辆空调系统，如：机车、铁路客车、地铁、轻轨、高速列车的车用空调系统、液压控制系统和其它附属产品。
According to the present problems and developing tendency of hydraulic turbine governor , four main issues of this field are studied in this paper . the content include hydraulic control system , frequency measurement unit , stability of the discrete control system , optimization of control parameters and self - adjusting pid control strategy based on fuzzy logic . several main achievement and results are obtained and shown as follows : the electric - hydraulic pilot valve driven by step - motor is firstly proposed , which solves the problem that the electric - hydraulic converter of hydraulic turbine governor hydraulic servo is prone to be stuck and blocked and improves the systemic stability greatly 本文根据水轮机调节领域存在的问题和发展趋势，对水轮机调速器的液压控制系统、频率测量环节、离散调节系统稳定性与调节参数最优整定以及适应式参数自调整pid控制策略进行了研究，得到以下主要成果和结论：首次提出了采用步进电机驱动的步进式电液引导阀，从根本上解决了水轮机调速器电液随动系统中存在的电液转换元件发卡、堵塞问题，使电液随动系统的可靠性大大提高。
With the development of the ac servo system , there is a new electro - hydraulic servo system which is called direct drive electro - hydraulic servo system . this new system has many advantages such as better controlled ability , higher efficiency , smaller bulk , simpler construction and energy saving . so it is widely considered to be one of the most important developing directions of the hydraulic control system 随着交流伺服技术的发展,出现了一种新型的电液伺服系统? ?直驱式电液伺服系统,它具有电动机控制的灵活性和液压系统出力大的双重优点,具有高效节能、体积小、可靠性高等显著优点,被认为是液压控制系统的重要发展方向之一。
