ARMAX模型参数估计的智能搜索辨识方法

基于基因搜索技术,建立了ARMAX模型参数的智能搜索辨识方法.提出了一种通过ARMAX模型零极点变换确定模型系数取值范围的间接方法及非可行域内染色体的修复方法.在遗传算法实现中,通过设计自适应适值函数来调整选择压力,设计自适应交叉概率,对传统的交叉和变异操作进行改进,嵌入基于Metropolis准则的"灾变"操作,采用精因保护策略,改善了遗传算法的全局搜索和局部寻优能力,加速了寻优过程.有关算例证明了本文方法的有效性.     

Thermal contact conductance at continuous roll-casting interface

The effects of surface roughness, strain rate, friction coefficient and pressure on real contact area were analyzed based on the research of Stupkiewicz. The real contact area model taking account of the effect of friction and deformation of material was obtained. The model of contact conductance at the rolling interface was obtained by integrating the specific feature of heat transfer through the interface of continuous roll-casting. The results indicate that the real contact area increases obviously when the material is under yield, and the real contact area varies inversely with surface roughness, whereas it varies exponentially with friction coefficient, strain rate and pressure, and the power factor depends on strain rate.     

1600高速铝带轧机扭振研究(续完)

四、稳态轧制扭振形态及其振源辨识 4—1:稳态扭转的基本形态——时域曲线功率谱分析 稳态轧制过程的扭振时域曲线是正弦波加宽带随机噪声的平稳随机过程。其统计规律不依赖时域曲线中时间的选取,而具有重复性。对其所做功率谱分析结果(图16)说明     

O／W乳液对金属表面润湿性的探讨

分析了润滑剂的润湿性与润滑性的关系，通过实验探讨了不同因素（油相组成及其浓度、乳化剂组成及其浓度、金属材料与表面粗糙度）影响下，Ｏ／Ｗ乳液对金属表面的润湿性能，分析了各种因素影响下润湿性变化的内在机理。     

模态分析的一种新方法--键合图法

键合图理论与方法一直被认为是一种物理系统建模与仿真的有效工具，通过分析与推导，本文提出了一种将键合图用于获得机械系统模态(振型)参数的新方法，传统方法只能直接得到一种模态参数，而基于键合图的模态分析方法则能一次得到两类模态(互为对偶)，且便于处理存在大量零频率模态的系统，由于键合图是一种基于能量守恒和信号因果分析的动力学建模方法，借助该方法，模态方法和概念可向非机械系统拓展，所提供的算例证明了本文提出的方法的正确性。     

Research on theory and method in parallel designing environment based on coupling

Understanding the relation between multiple agents is very important in developing a multi-agent system. Two concepts, multi-agent system architecture and multi-agent system architecture prototype are brought forward, and the method of descrbing the relation between agents using the concepts is explored. The structure and components are designed. Based on the fact that cooperation between distributed agents is erratic, a controlled natural language communication function is designed and realized. Applying the offered interfaces, the user‘s workload consumed in agent communication and management is reduced, and at the same time, robustness of the multi-agent system is improved.     

300t摆式飞剪同步机构的新设计

本文主要介绍了300t摆式飞剪新型同步机构设计方案的基本工作原理,以及新型同步机构与原斜块同步机构对比的优点,可供参考。     

巨型水压机立柱螺纹力学行为弹塑性有限元分析

巨型水压机立柱螺纹连接是构成水压机受力框架的关键传力件,为认识和发挥水压机的潜能,螺纹连接的负荷与应力是需要首先查明的问题。本文应用弹塑性接触问题有限元法,提出了一种进行巨型螺纹连接力学分析的新计算方法和程序,计算结果揭示了3万吨水压机立柱螺纹的真实应力应变状态和论证了工作负荷增大的可能性。