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For this reason, an optimal automatic timing control algorithm is proposed, that can restrain the switching frequency in a certain range to achieve the purpose of high efficiency and energy conservation. Taking such factors as inductive reactance at AC side, switching frequency, harmonic distortion rate and switching loss as well as the interaction among them into consideration, the formulas for inductive reactance and switching frequency are given; then by use of digital signal processor TMS320F2812, a prototype based on the proposed algorithm is implemented, and using this prototype the effectiveness and practicality of the proposed method are verified by experimental research and simulation.

文章提出了自动定时控制的优化算法，将开关频率限定在一定范围内，以达到高效节能的目的；综合考虑交流侧感抗、开关频率、谐波畸变率和开关损耗等指标，提出了主电路电感参数和开关频率的选择公式，并采用TMS320F2812数字信号处理器构造了试验样机，进行仿真和试验研究，其结果证明了该方法的有效性和实用性。

This paper bases on the technique of virtual prototype and utilizes software platform of UG, ADAMS and ANSYS to establish three-dimensional digitized virtual prototype of double link jib system of portal crane and systematically do its analysis of dynamics emulation of multi-body system.

本文基于虚拟样机技术，利用UG、ADAMS、ANSYS软件平台，建立了门座起重机四连杆组合臂架系统的三维数字化虚拟样机，并对其进行了较为系统的多体系统动力学仿真分析，实现了计算机对组合臂架系统在各种工况下随载荷变化的运行状态及随时间变化过程的仿真，得到的相关仿真分析数据对于门座起重机组合臂架系统动态设计提供了有效的手段。

In the paper, the process and procedure of rapid prototype based on the LOM technology is introduced simply, and the problems to be noticed in the manufacturing process of prototype are given.

简单介绍了基于LOM技术快速原型的制作过程及原型制作过程中应注意的问题，研究了LOM原型在硅橡胶模具、金属喷涂模具、树脂型复合模具等快速模具制造工艺中的应用，并介绍了各种快速模具工艺流程。

The technology scheme is chosen middle frequency DBD to develop large-scale ozonizer. And based on above mention, the test prototype is realized successfully, when fed gas is oxygen, the test prototype can output 300g/h ozone gas, and the ozone concentration is about 50g/m〓, the energy efficiency is 150g/kWh.

选择确定中频介质阻挡放电作为研制大产额臭氧发生器的技术方案，并在放电等离子体合成臭氧的试验研究基础上，研制成功300g／h的臭氧发生器试验样机，原料气体为氧气时，样机产生臭氧的浓度为50g／m〓，并达到150g/kWh的臭氧产率。

After the \4ear resist alloy with high melting point is sprayed on the prototype , the spray formed layer is backupped, the prototype is separated from the spray layer , the post processing is completed, and a high precision perdurable metal tool is finally produced.

在该原型表面熔射高熔点耐磨合金后，通过对熔射层背衬补强、并将原型与熔射层分离以及后处理，即可制得高精度耐久金属模具。

After the \4ear resistant alloy with high melting point is sprayed on the prototype, the spray formed layer is backupped, the prototype is separated from the spray layer, the post processing is completed, and a high precision perdurable metal tool is finally produced.

在该原型表面熔射高熔点耐磨合金后，通过对熔射层背衬补强、并将原型与熔射层分离以及后处理，即可制得高精度耐久金属模具。

In the case of transient fault, the difference is minute because the fault model is consistent with the prototype, but for the permanent fault, the difference is notable, the fault model does not coincide with the prototype. Moreover, the developed algorithm is simple and only uses one-terminal data.

瞬时性故障情况下，故障模型与求解模型一致，电感求解值与实际值差异很小；永久性故障情况下，故障模型与求解模型不一致，电感求解值与实际值差异明显。

When the geometric similitude ratio of the model to the prototype was determined and the loading similitude condition was satisfied by using similitude theory in structure modeling and experimental techniques, the prototype soil parameters were derived according to the model test result. The vibrating wheel compelled by harmonic exciting force was treated as a lumped mass vibrating system by equation equity method. By using this mechanical model in vibrating compaction, soil parameters were identified according to the equivalence of vibrating differential equation. The curve fitting method of amplitude versus frequency response was used for dynamic simulation based on the systematic dynamic equation of vibrating roller-soil system.

用相似理论与模型试验法在确定了模型与原型之间的几何相似比并满足载荷相似条件后，根据模型试验结果推导出了原型土体参数；用方程对等法把受简谐激振力作用的振动轮等效为集中质量振动系统，以此作为振动压实过程的力学模型，根据振动微分方程的等效条件进行识别；用幅频特性曲线拟合法以振动压路机－土壤系统动力学方程为基础，用计算机进行动态仿真。

The prototype of SGT is successfully developed for the demand of high accuracy and high speed of Attitude and Orbit Control System of the SST. The prototype images by a refracting telescope with optical aperture, focal length and field of view 60mm, 810mm and 1°×1°, respectively.

针对SST姿态控制系统高速高精度的导行要求成功研制了太阳导行镜样机，该样机采用折射望远镜成像，光学口径60mm，焦距810mm，视场1°×1°。

Aiming at solving the difficulties of prototype manufacturing of conical ring for the steam generator shell of 600MW Nuclear Reactor,this paper developed a new techniques for the prototype manu-facturing of the great conical ring utilizing ring rolling technology based on RAW200/160-5 ring rolling.

1引言600MW蒸汽发生器壳体是核电站的关键设备，由封头、锥形环件和筒体组焊而成。以往制造这种锥形环件所采用的办法是，先锻制环形筒件再采用机械加工方法成形或者采用自由锻造方法直接在水压机上锻制出大型锥形环件，但这些工艺既费工时又大量浪费材料，而且产品精度不高[1]。

The production moved off-Broadway to New York City, where she won the Joseph E. Calloway award for her performance, and was profiled in American Theater Magazine as one of ten young theater artists to watch.

生产提出过百老汇的新的纽约市，在那里她赢得了约瑟夫calloway奖，她的表现，并于异型在美国的战区杂志之一， 10战区的青年艺术家观赏。

It's a risk tradeoff, and I believe that adding test support code usually wins.

这是一个风险的权衡，我相信添加测试代码通常会占上风。