液压

Through analyzing the problem of the coal wall support, top-coal caving and the design of powered support,the author explains the method to control the coal slabbing and the measure of powered support design and the collocation of the rear transport pan.

通过对仰采放顶煤工作面煤壁支护、放顶煤问题、液压支架设计等方面的分析，说明在仰采工况下控制煤壁片帮方法以及液压支架设计、后部输送机布置应采取的措施。

This article will analyse dynamic performance of hydraulic system through establishing mathematical model to the roadheader slewing hydraulic loop system.

本文将通过对掘进机液压回路系统建立数学模型，分析液压系统的动态性能。

And the hydraulic system cushioning attachment has a great effect on kinematics characteristic and dynamics characteristic of the slewing system.

本文将通过对挖掘装载机挖掘装置回转液压系统静、动态特性的仿真分析，对挖掘装载机挖掘装置回转液压系统的设计提供一些理论依据。

We have incorporated a hydraulically actuated lashing device that either lashes the inner of the lifter to the outer body or detaches the body from the internals of the lifter,thereby not translating the motion from the cam onto the pushrod,"said Nandu Srinivasan,Manager of Advanced Engineering for Engine Air Management Operations at Eaton Corp."

我们已经合并了这种液压驱动装置，即可以使挺柱内部零件和外体紧固，也可以使外体和内部零件分开，当松开时就不会将运动从凸轮传递给出推杆，Nandu Srinivasan，伊顿公司的发动机进气管理工程部门的经理说：&当推杆上受到液压时，它会分开外体，由于没有互相锁定，推杆基本上是在凸轮上，上升下降，就像伸缩望远镜杆一样。&

The thesis is right to draw in machinery , push away and depend on , clamp, three devices of structure and function have made a throughgoing and painstaking analysis, has calculated and checked relevant structure; Have chosen some components in hydraulic pressure, has drawn the principle picture of the hydraulic pressure, and has made brief illustration to its movement course; Go up and down with the programming realization of PLC in the electric respect, draw , push away and depend on, clamp movement circulation.

论文在机械结构方面对拉伸，推靠，夹紧三装置的结构和功能作了深入细致的分析，计算并校核了有关结构；液压方面选择了部分元件，绘制了液压原理图，并对其动作过程作了简要说明；电气方面用PLC编程实现了升降，拉伸，推靠，夹紧动作循环。

First of all, design goal and design basis Serviceability And so on The key point is the work survey and the performance parameter design calculation and designs the request and how to choose the major components according to the parameters If the hydraulic cylinder, sells the axis and so Secondly, the article presents the working principle of every part in the design how the bucket, the arm and the boom斗Throwout lever respectively works.

文章主要介绍平整装置的液压系统主动臂、副动臂、伸缩臂、铲斗的尺寸参数设计和有关计算。首先介绍平整装置设计目的和设计依据，适用性等。重点是工作概况及性能参数的设计计算和设计要求，并根据性能参数来选择主要的工作元件如液压缸，销轴等。

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。

At present, the valveless hydraulic drill is wildly used in many fields. Comparing with the development of the abroad and analyzing the native practice, we take the valveless hydraulic drill that hasn't formed mature theories as the object and make the study with the technology of computer imitation. The main contents of the study are as follows. 1.The accumulators of the hydraulic drill have been carefully analyzed and studied.

目前，液压冲击机械在各个行业中得到迅速推广应用，本文在研究国内外现状的基础上，选择在国内仍处于开发阶段，设计理论还不是很成熟的无阀液压凿岩机为研究对象，运用计算机仿真技术对其进行了研究，主要内容如下：1。

By regression of experimental data, therules of the linkage between these factors, which will provide a theoretical basis for designing BBP with different scales.3 Using thermal analysis technology and dynamic thermogravimetry, the paper studies combustion kinetic characteristics of 3 types of agricultural crops at different rate of temperature rise, and thus, achieved dynamic parameters of these fuels at different rate of temperature, established dynamic model of straw combustion, which reflects the dynamic process in the fast combustion area.4 Characteristics of straw briquette combustion was experimented, focusing on the impact of straw type, temperature, air supply, and density, diameter, and weight of briquette on the combustion speed, and the following conclusions were drawn:(1) combustion of straw briquette fuel is static permeation diffusion combustion;(2) temperature has a larger impact on the speed of straw briquette combustion than air supply; the higher the combustion temperature is, the faster volatilizable component separates out, and the less steady the combustion is;(3) density of briquette fuel has impact on the speed of volatilizable component separation and therefore the combustion speed;(4) increase of diameter and weight of briquette fuel increases the average combustion speed in the initial stage, and that in the later stages is comparatively steady;(5) the proportion of volatilizable component in straw briquette fuel is high, therefore, the temperature control during combustion under the rational ventilation condition is essential to ensure its safe combustion.5 Using the above-mentioned results of experiments and theoretical analysis, and based on thought of hydraulic driven and bi-direction compression, the hydraulic system and compression parts of the HBP BBP are re-designed in terms of industrialization.

利用热分析技术，采用动态热重实验法，对我国的三大农作物秸秆在不同升温速率下的燃烧动力学特性进行了较系统的研究。得到了各原料在不同升温速率下的动力学参数；建立了秸秆燃烧的动力学模型，该模型反映了秸秆迅速燃烧区的动力学过程。 4 对秸秆成型燃料的燃烧特性进行了试验研究。着重研究了秸秆河南农业大学博士学位论文巫的种类、温度、空气供给量、成型燃料密度、直径、质量对成型燃料燃烧速度的影响并得出如下主要结论：①秸秆成型燃料的燃烧方式属于静态渗透式扩散燃烧。②秸秆成型燃料燃烧速度受温度的影响大于通风量燃烧速度的影响：燃烧温度越高，挥发分析出速度越快，燃烧平稳性愈差。③成型燃料密度影响成型燃料挥发分的析出速度，影响燃烧速度。④成型燃料直径和质量的增加，使得燃烧初期的平均燃烧速度增大，中后期的平均燃烧速度相对平稳。⑤秸秆成型燃料含挥发分比例高，因此合理配风下的控温燃烧是保证其完全燃烧的关键。 5运用已取得的试验和理论分析结果，以液压驱动、双向成型为基础，从产业化的角度对HBP型成型机进行了液压系统和成型部件的改进设计；同时采用了二级预压机构，使该成型机的生产率达到 500kg.hd；单位能耗 60kwh。上'左右，磨损件修复周期 300小时左右，基本解决了影响生物质固化技术在国内推广的技术难题。

From the last century 80's hydraulic wrench in the system and the North China Huaneng Power Plant OFTA all started, after two decades of hard work, my company sold products to several dozens of categories, such as controllable torque tools , valve grinding machine, portable hole processing equipment, pipe beveling machine, high-energy welding equipment, processing equipment flange, heat exchanger tube repair, hydraulic tool equipment, such as ultra-high, with more than thirty foreign professional firms in China the exclusive authorized sales and after-sales service.

从上世纪80年代液压扳手在华能系统及华北电管局各电厂的应用开始，经过二十年的艰苦努力，我公司所销售产品发展到几大类数十种，如可控力矩工具、阀门研磨机、便携式孔加工设备、管道坡口机、高能焊接设备、法兰加工设备、换热器管修复、超高液压工具设备等，拥有三十余家国外专业公司在中国的独家销售及售后服务授权。

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。