机械工程

INTERMAT French International Construction Machinery Exhibition in April 2009 20-25 day north of Paris Villepinte Exhibition Center

INTERMAT 法国国际工程机械展 2009年4月20-25日巴黎北维勒班展览中心

At first, the thesis illustrated in detail and commented on the various theories of China's engineering machinery industry and industry cluster competitiveness, paving the way to research on the ChangZhuTan engineering machin

接着，论文采用主成份分析法完成了对长株潭工程机械产业集群竞争力的定量分析。

Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Fishery Machiner and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China

农业部渔业装备与工程重点开放实验室，中国水产科学研究院渔业机械仪器研究所，上海 200092

CAD technique is a composing of advanced manufacture technique. It is the most high-class and new application technique in the field of engineering project and machinofacture, and so on.

CAD技术是先进制造技术的重要组成部分，是计算机技术在工程设计、机械制造等领域中最有影响的一项高新应用技术。

Guangdong Province, Guangdong Province Magnetoelectric company, founded in 1986, the company construction area of 45,000 square meters, existing staff 1300 people, engineering and management staff of 150 people, mechanical equipment and 400 sets of tooling, fixed assets of RMB 2.5 billion, approved by the National Foreign Trade and Economic Cooperation, to obtain the right to self-import and export business.

广东省粤东磁电公司，创建于一九八六年，公司建筑面积达45000平方米，现有职工1300人，工程技术及管理人员150人，机械设备及模具400台套，固定资产人民币2.5亿元，经国家外经贸部批准，取得自营进出口业务权。

Bachelor degree in Mechanical/Metallurgic/Manufacturing Engineering.

机械/冶金/制造工程专业，本科及以上学历

MICO is the sole specialty supplier for hydraulic and electrohydraulic brake components and systems in the world of wide.

MICO公司是世界上唯一一家专业制作液压和电液制动产品的跨国公司，设计，制造和销售高品质的液压和电液制动产品及系统，其产品主要用于工程车辆等非路面机械和设备。

The high rise operation mechanism mainly is the fluid cylinder that the control points a top and bottom arm to luffe, and the hydranlic moter to control top and bottom arm turns around.

本次设计以徐州海伦哲工程机械有限公司研制开发的&GKZ14型高空作业车&为研究对象，对该车上的液压系统进行设计。

The application of BP nerval network to failure diagnosis of hydraulic systems in construction machinery is studied. Through collection of the system data, derivation of eigenvectors and structure of classifiers, a learning algorithm is established on the basis of network training. Tests show that satisfactory results can be obtained by the nerval network.

将BP神经网络理论应用于工程机械液压系统故障诊断中进行研究，通过系统数据的采集、特征向量的提取和分类器的构造，在对网络进行训练的基础上，建立了学习算法，通过试验可以看出神经网络能给出的满意结果。

The larger subharmonic component will be introduced into the system after the instability of system periodic motions, the motion of systems will be nonsynchronous precession and the amplitude of alternate stress in the rotor shaft is high. The long-term existence of instability will directly threaten the safe running of the rotor systems. Research on the influence of the change of system parameters on the system dynamical behaviors, the stability of system periodic solutions with the change of system rotational speed and the system motion after instability will have the theoretical and engineering-oriented significance for the long-term safe running of large-scale rotating machinery.

转子系统失稳后会产生较大的低频振动分量，系统运动出现非协调进动，系统转轴中会产生幅值很大的交变应力，转子失稳状态的存在直接影响系统的安全运行，因此研究转子系统自身参数的变化对系统动力稳定性的影响，研究系统周期解随工作转速的变化情况及其失稳后的运动规律，对大型旋转机械的安全稳定运行具有重要的理论意义和工程实用价值。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。