液压

The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求，提出了基于VXI总线的液压测试系统的整体设计方案，完成了测试系统的硬件设计与软件设计，包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容；以伺服阀动态特性测试为例设计了测试模块，该模块体现了VXI总线仪器软件开发所倡导的"虚拟仪器"的思想，以软件的灵活应用满足了不同的测试需求；结合自动测试系统的发展，研究了VXI测试系统与网络技术结合，实现各种软硬件资源共享，进一步提高设备及数据的利用率和系统的扩展性，使自动测试向综合化、网络化方向发展；研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题，讨论了伪随机信号的产生机理，从频域和时域分析了伪随机信号的性质及其应用，提出了用逆重复伪随机信号弥补了普通伪随机信号的不足，并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化，可以更合理而不是凭经验产生需要的逆重复伪随机信号。

Currently most domestic break-test-plateform adopt the liquid-pressure-servo technique, which possesses the advantages of higher frequency-response and higher controlling exactness, but in the same time , the disadvantages of higher cost, variation of function with the change of oil viscousness produced by the fluctuation of temperature.

目前，国内的制动器试验台大多采用的是液压伺服控制，这种控制具有响应频率高、控制精度高等优点，主要缺点是系统成本高、油液粘度随温度变化引起工作性能的变化、且液压系统对油液的污染比较敏感，必须要有良好的保护和过滤措施。

The paper introduces the state of hydraulic cylinder voidance ,by contrast adoptting bore enlarge repair cylinder.

介绍了液压缸体的失效状况，通过对比采用扩镗方法修复缸体，并介绍了液压缸体扩镗的工艺过程，对其进行强度验算。

The article produces the situation of the market according to real work circumstance and domestic weather strip, the hydraulic pressure crock of system of hydraulic pressure of product line of diagonally steel numerical control is sealed undertook optimizing designing, logical choice weather strip, reached weather strip service life long, reduce the maintenance rate, result that improves efficiency of whole platform equipment and performance thereby.

文章根据实际工作情况和国内密封件生产市场的情况，对角钢数控生产线液压系统的液压缸密封进行了优化设计，合理选择密封件，达到了密封件使用寿命长、降低维修率、从而提高整台设备效率和性能的效果。

The four-bar linkage model of hydraulic support using virtual prototype technnique is established with the help of ADAMAS software.

介绍虚拟样机技术特点，利用ADAMS软件建立了液压支架的虚拟样机模型；对其四连杆机构进行动力学仿真分析，并将机构模型作参数化处理；进行优化设计，实现了液压支架四连杆机构设计参数的优化。

The design of domestic hydraulic bending roller system usually adopts analogism and this has lacked theoretical supports and has some demerits. Under the circumstance, China National Erzhong Group Co.

对弯辊液压系统的设计，一般采用与国外同类弯辊液压系统相类比的方法进行设计，类比设计方法由于缺乏设计的理论依据，有很多缺陷，实际应用中存在许多问题。

TheHydraulic Metal Shear machine be pressed by machine system, hydraulic the system( fuel tank, pump stand, valve stand),electricity system ( electricity control cabinet, press buttonstand) waits to constitute, having electricity circuit andhydraulic press to take care of the road its conjunction anorganism the whole and complete every kind of related workfunction.

金属剪断机由机械系统、液压系统、电气系统等组成，有电气线路及液压管路将其连接成一有机整体并完成各种相关工作功能。

The application of ashless anti-rusting additive in HM hydraulic oil is introduced,with the result that it has so good anti-rusting ability that it can meet the anti-rusting requirements of the HM hydraulic oil.

介绍了研制的无灰防锈剂在HM液压油中的应用情况，评定结果表明：该剂具有良好的防锈能力，可满足液压油的防锈性要

With comC technique''s dependent we have engaged more than ten skilled graduaters in forming machines, advanced test equipmentsso on,and make my factory be a most speciality for hydraulic hoses hose clipsfittings hydr aulic adapters welding fittings.used in heavy engine vehicles、railway、metaiiurgy、chemical industry etc way in China.

随着数控技术的发展，我厂高薪聘请十余名专业化从事液压件开发、设计、制造的高技术人才，是国内最具有规模的液压胶管、管夹、接头、过滤接头、焊接式接头的生产企业，产品广泛用于国内重型机械车辆、铁路、冶金、化工等行业。

The SED styled of turning with hydraulic pressure produced by Nicolas are easily to be controlled.It uses hydraulic pressure hanging frame and goose necked drive with autoturning unit in it.There are many kinds of flat roof,such as low flat roof,narrow or broad or flexable flat roof..

法国尼古拉斯的带液压全轮转向的SFD形式，操纵性好，使用液压悬架，动力鹅颈内安有自动转向单元，有多种形式的平台，如低平板，窄或宽的或者是可伸缩的平台。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。