动力系统

Chapter 4 firstly analyses the generation mechanics, calculating method and interference effect of flow force in the outflowing large-capacity proportional valve. Then it not only presents a structural design to compensate the flow force according to the performance characteristic of the cone valve, but also calculates and simulates the flow field at the valve port through CFD software Fluent6.0. At last it studies the influence of compensation structure parameters and obtains better projected dimensions.

第四章主要阐述了电液大流量控制阀的液动力产生机理，计算及其对系统的干扰作用，在此基础上针对该阀的结构和工作特点提出阀芯所受液动力的补偿方法和结构，然后对阀口处的流场进行了有限元仿真计算，探索了液动力大小与补偿结构的各参数之间的关系，最后得出能实现液动力补偿的合理结构。

I clearly remember one warm 28 degree day in LA when I was driving my Mustang Fastback that didn't have power windows, power steering, power brakes, GPRS satellite navigation, air conditioning, cup holders, xenon lights, or bluetooth in-car telephone systems, etc… Yes, the brakes and steering were hard to operate and my face and back were wet with sweat but the sensation and indescribable high I got from driving the car down the highway was something you'd never experience from driving a modern sedan or sports car.

我清楚记得一个在洛城的日子，户外温度大约摄氏28度，我开著一辆揭背式野马。那辆车没有电动窗，没有动力方向盘，没有动力辅助煞车，没有GPRS卫星导航系统，没有冷气空调，没有杯座，没有氙气车灯，没有内装蓝牙电话系统…等等。煞车跟方向盘都很难控制，我的脸和背布满了汗珠，但是当我开上快速道路时，我内心兴高采烈的程度是你在现代的轿车或跑车身上完全无法体验得到的。

First, we made a model of exhaustive exercise in rats, and used sucessfully the model in this study. We studied the effects of exhaustive exercise on adhesive behaviour of leukocytes in mesenteric venules by using an intravital microscope video system Its results indicated that the adhesiveness of circulating leukocytes to mesenteric venules enhanced after exhaustive exercise in rats.

首先，本文以游泳方法建立了大鼠模拟运动力竭模型，并成功地将此模型运用到本研究中；设计制作了肠系膜固定有机玻璃板，组成了一套活体显微观察实验系统；研究了大鼠运动力竭前后肠系膜微循环中白细胞粘附行为，结果表明：大鼠运动力竭后肠系膜微循环血流流态发生了明显的改变，大鼠运动力竭后肠系膜微循环中白细胞粘附性增强、白细胞滚动速率降低、在体白细胞变形性减小，将影响微循环正常的灌注，是导致微循环障碍发生发展的一个重要原因，进而最终表现为机体运动能力和运动质量下降。

System, motive is necessary. Certainly it is particularly important of the power transmission system.

传动系统设计，作为一个动作执行系统，动力是必不可少的，当然对动力的传递系统也就显得尤其重要了。

To match the load characteristic of shoe tree CNC machine tool's transmissionsystem more reasonably ,minimize the moment of inertia and react to the change ofvelocity and acceleration in every axis quickly ,this paper introduces a method ofbuilding the mathematics model based on motor′s load to optimize the transmissionsystems ,distribute the total speed rate and analyse the transmission systems to chosethe best transmissionscheme.

为了实现鞋楦机床数控进给传动系统负载特性的更好匹配，使各轴能够快速地响应速度和加速度的变化，建立了基于电机负载的传动系统数学模型，分析了各个相关动力参数对电机负载的影响，进行了传动系统速比的优化、进行了载荷的匹配、确定了最佳的传动方案和动力参数以实现电机的负载最小。

Sponsored by the National Natural Science Foundation under the National Key Project"The modern method and system for remote pseudo dynamic testing of structures under earthquake simulation"(50338020), some studies on the method for remotely collaborative hybrid dynamic testing of substructures and structural elements have been carried out in this thesis. The main research achievements are summarized as followings: Based on the network communication platform NetSLab (Networked Structural laboratories) developed by the research group, the rational framework of a platform for remote pseudo dynamic testing applications of substructures and structural elements is proposed and a robust standardized platform entitled NetSLab-SDOF has been developed for remotely collaborative hybrid dynamic testing of single story structures with Visual Basic program language. It is composed of four modules, named as control center, physical tester, virtual tester, and remote observer.

本文结合国家自然科学重点资助课题&现代结构拟动力地震模拟协同试验方法与系统&(50338020)，对结构远程协同拟动力试验方法进行了研究，主要成果如下：基于课题组开发的网络平台NetSLab，搭建了结构远程协同拟动力试验平台的构架，采用Visual Basic语言开发了一个标准化的开放式单层结构远程协同拟动力试验平台NetSLab-SDOF，它由控制中心、真实试验机、虚拟试验机和远程观察器四个模块组成。

Modern vessel power technology advance with vessel axle department a main research object, study structure characteristic, main technology, economy and performance index of its motive equipment; Advance axle department stable state and trends of device cooperate with the characteristic; Economy and improving

课程简介：现代舰船动力技术以舰船推进轴系为主要研究对象，研究其动力装置的结构特点、主要技术、经济及性能指标；推进轴系装置的稳态和动态配合特性；热力系统的经济性和提高装置经济性的有关措施；推进轴系振动的原理及减振措施；舰船动力装置的可靠性分析等各方面内容，以增加对现代舰船动力技术知识的了解。

Using this model, the optimization of the powertrain rubber mounting components parameters and vehicle riding quality could be acquired. A large number of vibration response experiences and spectrum analyses of full vehicle on road and idling are measured.

可进行动力总成悬置系统的隔振性能计算分析和该系统隔振性能对整车振动影响的计算分析，也可用于优化动力总成悬置系统参数，达到提高整车平顺性和舒适性的目的。

In this paper,the basic control requirements of Switched Reluctance Starter/Generator applies to Hybrid Electric Vehicle Integrated Starter Generator system to realize starting and generating are discussed.

本文将开关磁阻电机起动、助力、发电一体化应用于混合动力汽车ISG系统中，实现混合动力汽车ISG系统的起动、助力、发电等基本功能，同时设计了系统的整体控制策略，构造了基于TMS320F240和EPM7128S为核心的DSP+CPLD型数字控制器，完成了六相12/10结构开关磁阻起动/发电机样机的起动和发电实验，给出了实验波形和分析结论，表明了本方案控制器和控制策略的可行性和有效性。

Based on the elastic theory of large deflection and by taking into account the variation of the axial force and its effects on bending deformation of the drillstring in vertical section ,the vibration of the drillstring induced by fluctuating weight on bit is described by a parametrically excited system.

基于弹性大变形理论，考虑到轴力沿钻柱轴线的变化及其对钻柱弯曲变形的影响等因素，将受自重作用的铅垂井段钻柱在波动钻压激励下的振动转化为一个参数激励系统，用 Galerkin方法首次得到了描述此系统的 Mathieu方程，并通过将方程的解展成富里叶级数的方法，得到了该振动系统的动力分岔值曲线及其所包围的动力不稳定区。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。