摘要：Factors for determining the spindle size are the shaft diameter,positions of bearing and motor,and entire length of the ***,it is important to find the assembling of the optimal design variables,which satisfy the stiffness and rotational speed required to the spindle.A general full factorial design method was used to verify some factors that affect the natural frequency of a *** is verified that the shorter shaft length and bearing span length represent the higher natural frequency,and there are some effects according to the change in the levels of *** detailed spindle dimension is determined by applying an EVD method,which can define the optimal bearing position through considering the limiting *** on the estimated regression model,the optimal spindle size and bearing distance that can improve the primary natural frequency are obtained,and the influence of design factors on the natural frequency is also analyzed.

摘要：The wear rate between the rotors of a hypotrochoidal gear pump is *** the knowledge of shape design on the rotors,the contact stresses without hydrodynamic effect between the rotor teeth were evaluated through the calculation of the Hertzian contact *** on the above results and the sliding velocity between the rotors,a genetic algorithm (GA) was used as an optimization technique forminimizing the wear rate proportional factor (WRPF).The result shows that the wear rate or the WRPF can be reduced considerably,*** 12.8%,throughout the optimization using GA.

摘要：由于在高效率和精确性之间的好平衡，元模型基于优化算法是一个重要全球优化范畴并且广泛地被使用了。更好解决高度非线性并且集中的工程优化问题，一个提高的混血儿和适应元模型基于的计算全球优化(电子火腿) 首先在这个工作被建议。重要区域更改方法(IRU ) 和不同采样尺寸策略在优化方法被建议提高表演。由使用自动、可伸缩的策略，重要区域将根据搜索结果适应地被更新改进产生精确和集中率。不平的采样策略和集中的采样策略在优化的不同阶段被使用高效地改进搜索并且避免过早地在一个小设计空格聚在一起的结果。新优化算法的有效性被与不同变量凳子标记优化问题作比较到六个优化方法验证。电子火腿优化方法然后被使用优化实际否定泊松比率(NPR ) 的设计参数在这个工作的碰撞盒子。结果显示建议电子火腿在优化计算有高精确性和效率集中的问题和罐头广泛地在设计工业被使用。

摘要：Thermal performance was the most important factor in the development of borehole heat exchanger utilizing geothermal *** thermal performance was affected by many different design parameters,such as configuration type and borehole size of geothermal heat *** eventually determined the operation and cost efficiency of the geothermal heat exchanger *** main purpose of this work was to assess the thermal performance of geothermal heat exchanger with variation of borehole sizes and numbers of U-tubes inside a *** this,a thermal response test rig was established with line-source *** thermal response test was performed with in-line variable input heat *** thermal conductivity and thermal resistance were obtained from the measured *** the measurement,the effective thermal conductivity is found to have similar values for twopair type(4 U-tubes)and three-pair type(6 U-tubes)borehole heat exchanger systems indicating similar heat transfer ***,the thermal resistance shows lower value for the three-pair type compared to the two-pair *** data based resistance have lower value compared to computed result from design *** comparison finds better thermal performance for the three-pair type,however,fluctuating temperature variation indicates complex flow behavior inside the borehole and requires further study on flow characteristics.