双凸极无刷直流发电机空载特性的分析

首先用变网络等效磁路法计算了12/8结构的某双凸极交流发电机的空载相电压，给出了实验结果的对比。然后，在此基础上给出了凸极无刷直流发电机的空载特性的求法，计算的结果和实验的结果进行了比较，说明该方法具有较高的计算精度。该无刷直流发电机空载特性的求出为双凸极无刷直流发电机的磁路设计提供了重要的理论依据。     

用最大增量法解线性规划问题

在无第一可行基的情况下,用最大增量法进行生基迭代,使目标函数在每次迭代中获得的增量最大,从而加快了最优化进程。     

连续型随机变量函数分布密度的一种简单求法

求随机变量函数的分布是概率论中的一个重要课题,无论是在理论还是在应用上都有着十分重要的意义.对于连续型随机变量ξ来说,可由分布函数的定义先求出随机变量ξ和它的函数η=f(ξ)这个新的随机变量的分布函数之间的联系,然后通过求导,得到密度函数之间的联系,从而求得η的分布密度.该方法严谨直观,计算简单、实用性强.     

Variable universe adaptive fuzzy control on the quadruple inverted pendulum

This paper focuses on the control problem of the quadruple inverted pendulum by variable universe adaptive fuzzy control. First, the mathematical model on the quadruple inverted pendulum is described and its controllability is versified. Then, an efficient controller on the quadruple inverted pendulum is designed by using variable universe adaptive fuzzy control theory. Finally the simulation of the quadruple inverted pendulum is shown in detail. Besides, the experimental results on the hardware systems, i.e. real object systems, on a single inverted pendulum, a double inverted pendulum and a triple inverted pendulum are briefly introduced.     

Using Cpk index with fuzzy numbers to evaluate service quality

Service quality is measured by customers' satisfaction. Traditionally, the degree of satisfaction is calculated from the data obtained from questionnaires that have been filled by customers directly. The percentile of each different level of a customer's satisfaction is employed to summarize and compare the quality of service provided by different enterprises. This approach does not consider the consistency of the customers' perceptions, thus making comparison difficult. This paper introduces the concept of a process capability index that considers both the average and the consistency of the data simultaneously. Evaluations of service quality are usually vague and linguistic. We use the fuzzy numbers of linguistic variables developed in fuzzy set theory to modify the process capability index, and then apply it to evaluate the quality of a service. The average and consistency of the data obtained from a service quality evaluation are thus considered simultaneously, making the comparison of the performance of service quality easier. Moreover, the value of the index can be applied to help to point out the direction for improving the performance of service quality whenever it is lower than some default value.     

原始随机空间内结构可靠度的分析方法

本文研究了原始空间内的结构可靠度分析方法，这种方法不需要将非正态随机变量映射或当量正态化为正态随机变量，因而特别适合于当随机变量的概率分布函数不存在显式时结构的可靠度分析．本文分别给出了原始空间内结构失效概率的一次和二次计算公式，通过３个算例证明了本文方法的可行性．     

简析如何进一步提高小型轧机的经济效益

针对目前我国一些小型连轧机生产效益不高等问题,提出应提高开发经济产品的能力,采用切分轧制、控轧控冷等先进成熟的实用技术,完善配套工艺,实现导卫装置的标准化、系列化,以使我国小型轧机结构优化和技术进步成为有经济效益的科技进步。     

关于“停走"生成器输出序列的大数定律

本文先建立了"停走"生成器输出序列的概率模型,讨论了由这类序列构成的随机变量序列的概率分布、独立性、数学期望和方差等概率性质,证明了此类随机变量序列服从大数定律.     

位置随动系统变结构李雅普诺夫双模控制

采用李雅普诺夫(Lyapunov)理论对变结构控制系统(Vscs)进行综合,针对位置随动系统提出了变结构Lyapunov双模控制。大偏差范围采用变结构Bang-Bang控制(BBC)以保证系统的鲁棒性与快速性,小偏差则采用线性控制,以提高系统的控制精度。仿真表明,它具有鲁棒性强、精度高与通用性强的特点。     

组合旋转壳体的安定上限分析

对一般组合壳体的各个子区的位移场进行双三次Ｂ样条插值，同时对子区交界处的广义向量以单三次Ｂ样条展开，推导出以广义力向量表示的组合壳体的平衡方程，然后从Ｂｅｔｔｉ互换定理和虚功原理出发推导出离散的壳体结构中可能的塑性应变率循环，从而给出了组合壳体安定上限分析的有限元列式，把组合壳体的安定上限分析归结为求解一个数学规划问题，文末给出了算例。