基于Pro／Engineer的绕包传动部分参数化设计

CAD技术在产品设计中具有重要地位,Pro／E作为具有CAD／CAM／CAE综合功能的软件得到广泛应用。本文主要介绍了参数化设计在机械设计中的应用,特别针对某些特征相似而造型复杂的零件的设计,参数化设计提供了便利快捷的解决方案。     

旋转体侧面积与体积的计算

本文利用换元积分法和坐标变换,分别讨论了直角坐标方程、参数方程和极坐标方程表示的光滑曲线,绕任一直线旋转一周时所产生的旋转体的侧面积和体积的计算方法．     

Auto-structuring fuzzy neural system for intelligent control

An auto-structuring fuzzy neural network-based control system (ASFNS), which includes the auto-structuring fuzzy neural network (ASFNN) controller and the supervisory controller, is proposed in this paper. The ASFNN is used as the main controller to approximate the ideal controller and the supervisory controller is incorporated with the ASFNN for coping with the chattering phenomenon of the traditional sliding-mode control. In the ASFNS, an automatic structure learning mechanism is proposed for network structure optimization, where two criteria of node-adding and node-pruning are introduced. It enables the ASFNN to determine the nodes autonomously while ensures the control performance. In the ASFNS, all the parameters are evolved by the means of the Lyapunov theorem and back-propagation to ensure the system stability. Thus, an intelligent control approach for adaptive control is presented, where the structure and parameter can be evolved simultaneously. The proposed ASFNS features the following salient properties: (1) on-line and model-free control, (2) relax design in controller structure, (3) overall system stability. To investigate the capabilities, the ASFNS is applied to a kind of nonlinear system control. Through the simulation results the advantages of the proposed ASFNS can be validated.     

Control systems approach to the sample inverse covariance matrix

A new method is proposed for finding the inverse of the covariance (or correlation) matrix. The technique is based on a previous method known as automatic variance control. The technique naturally gives rise to the inverse due to the properties of negative feedback itself rather than by traditional invertion methods. The method can be applied to the non-stationary problem and can form part of a recursive parameter estimation scheme.     

NM电算模式的研究与应用

依据NM(Nonlinear Mapping)理论,建立了电算模型,采用C语言和汇编语言有机结合编制了相应的程序软件及其应用界面,并在汽车高能干式点火线圈的测试装置中进行了成功的应用。     

远程过程调用的体系结构以及相关参数

本文简要介绍了远程过程调用(RPC)的本质和体系结构,以及码桩(stub)和RPC在用户可移动性上做出的改进.文章将具体讨论有关参数消息的建立、参数在消息中的表达形式和参数传递(parameter passing).     

虹鳟鱼集约化养殖主要技术及参数

１９８９年,青海省在联合国开发计划署／联合国粮农组织共同援助了,引进冷水名贵鱼类－－虹鳟鱼（Ｓａｌｍｏ ａｉｒｄｎｍｅｒｉｉ ｇａｉｄｎｅｒｉｉ）,经四年的试验,鱼卵孵化率达到９２．５％,平均２．５ｇ鱼苗成活率为８６．７％,网箱养殖商品鱼平均１１３６．７０吨／公顷,效益达７４０．８５万元／公顷,为虹鳟鱼在青海省形成产业化养殖打下了基础。     

地方高校广播电视新闻学专业实验室技术参数设计与选型

近年来,高校广电新闻专业快速发展,为社会培养了大量专业人才,同时也给高校的实验室建设提出了更高要求。但是,在高校广电新闻专业实验室建设方面,相关教育部门尚未出台明确的设计标准,各高校广电新闻专业实验室建设也参差不齐。文章尝试对地方高校广播电视新闻学专业实验室建设的技术参数进行设计,并给出相关设备选型,以期给地方高校广电新闻专业实验室建设提供参考。     

经验法在自动调节系统参数整定中的应用

在自动调节系统的参数整定中，经验法是一种凑试折方法。它将需调节的各种参数按不同的对象照表中的经验数值适当的选取，再将系统闭合起来，一边施加人为的干扰（例如改变给定值），一边看调节曲线的形状，如曲线不够理想，则按某种程序将参数反复调整，并施加相同的干扰观察调节过程曲线，将这些调节过程曲线相互比较，“择优录取”，并确定最佳参数值。最后对复杂的系统经验法作了改进。     

相序指示器演示电路实用参数的仿真设计

介绍了利用电路仿真软件PSpice设计相序指示器电路实用参数的方法。