A NEW METHOD OF RESEARCHINE THE SITE DUPLE FACE DYNAMIC BALANCE OF MACHINE RIGID ROTATOR BASE DON AMPLITUDE MEASUREMENT

In this paper, a new method of researching; the site dupleface dynamic balance of machine rigid rotator, namely duple test weightmethod is presented. Weight the new method against the existing method,namely single test weight method [1], both the efficiency increasing and theenergy-consumming dicreasing would be forty percent and over, with thebasic points of vibration theory, the formula of calculating weight andposition of the duple face dynamic unbalance of a rotator by means ofapplying the duple test weight is developed in detail. The method in handll-ing distinct bearing form is also discussed. Rightness of the new method isproved out by the living example of the simulant contrast testing carried outn the dynamic balance test machine and the site balance for a rotatorsystem of motor.     

TRUST REGION METHOD FOR UNCONSTRAINED OPTIMIZATION

A new trust region algorithm is proposed for solving unconstrained optimization problems. According to the quadratic approximate model of the original optimization problem,the trust region algorithm uses directions,a convex combination of the quasi-newton direction and the steepest descent direction. This algorithm with new strategy is analyzed and the global and local quadratic convergent theorems are proved. At last,the implementation and computational results of the algorithm are demonstrated.     

A Study on the Practical Algorithm for One Dimensional Equal Stock Cutting Problem

Based on alalysing the mathematical models for one dimensional equal stock cutting problem,a knapsack column generation algorithm has been constructed,which is a successive approximate algorithm for the practical engineering.In the end of this paper,some computational examples have been presented,which show that the convergence and optimum results of the algorithm are quite good.     

面向大规模定制的产品族模糊层次优化研究

基于对目前产品平台设计的研究综述，分析并指出了研究中的不足。介绍了产品平台的概念和特征，探讨了基于公共平台的产品族设计方法。提出了基于主从关联结构的层次优化设计理念，以及实现这一理念的方法和模型框架：并对模型的数学形式、模糊层次优化做了阐述。     

An evaluation of the Porac River irrigation system

An irrigation water management research programme was implemented by Hydraulics Research in collaboration with the National Irrigation Administration of the Philippines on the Porac Area of Porac Gumain Rivers Irrigation System. The objectives of the study are to monitor the response of the main canal network to changes in water availability and assess its capability to deliver crop water requirements to sub-areas jointly managed by National Irrigation Administration staff and existing Irrigator Associations. This paper presents an analysis of the response of the main system to the varying irrigation demands, and assesses the conjunctive use of groundwater with surface water and the potential of computer models to assist management with the preparation of the annual irrigation schedules.     

工况对发动机排气门失效的影响

发动机排气门在高温冲击环境下工作，恶劣的工况环境是使排气失效的重要原因之一。虽然在这种工况下，环境介质、气门机构的动力学特性都可使气门早期失效，但大量的研究表明：在正常情况下，影响气门失效的主要工况参数是温度及冲击次数。为此，讨论了汽车发动机工况对排气门失效的影响；探讨了进一步提高其使用寿命的有效途径。     

用振动挤淤法处理标准海堤的软土地基

以淤泥类软土的动力特性为基础发展起来的振动挤淤法，在标准海堤软土地基处理中有其独特的实用性。根据海堤的工程特点，分析了振动挤淤法在处理海堤软土地基的必要性和可行性。并着重阐述了振动挤淤法中3个关键施工参数的理论分析和工程实践，这3个参数包括：基础埋深，最小垫层厚度，施工机械作业参数。     

联合收获机前进速度模糊控制系统多目标遗传优化

针对联合收获机前进速度模糊控制系统参数设计具有主观性,导致作业性能不理想的问题,以切纵流联合收获机样机为研究对象,构建联合收获机前进速度模糊控制系统仿真模型,并建立控制性能和收获性能的优化目标函数来衡量联合收获机的作业性能,利用多目标遗传算法对模糊控制系统的隶属函数和输送槽、割台螺旋输送器和切流滚筒对前进速度的影响因子进行优化。通过对优化前后模型仿真对比和两组田间试验数据分析,表明优化后的控制系统在受外界干扰情况下控制性能得到了较好的保持,收获性能在喂入量变化不大情况下,单位平均损失率分别由1.45%和1.26%降至1.12%和1.14%,联合收获机的总体作业性能得到改善。     

峰谷电价下的梯级水电站短期优化

依据发电企业既要服从电网调度又要追求自身效益的特点，建立了两个考虑峰谷分时电价因子的梯级短期调度模型，并选用逐次优化和逐步逼近的混合算法(POA－DPSA)求解。该模型简单，算法易于实现。将该理论应用于电站实际演算中，结果表明这两个优化模型对促进电网的安全、提高企业发电效益具有较高的应用价值。     

锦屏拱坝基础变形模量多目标非线

基础变形模量对坝体的安全运行和受力有着十分重要的意义，特别是高拱坝，需要良好的基础变形模量，但是在一定的荷载运行工况下，并不是意味着基础变形模量越高坝体应力、稳定、变形状况就越好。基于上述观点，利用多目标非线性规划方法对锦屏拱坝最优基础变形模量进行了研究，给出了拱坝在最优基础变形模量条件下坝体应力、稳定、变形及基础处理费用等特征值。研究表明：经过基础变形模量的优化，能有效改善坝体应力、位移、稳定等多项指标。