多实例信息交换的演化方法

对实例结构中所蕴含的信息进行了系统的探讨 ,揭示了实例的内涵。更重要的是实例中蕴含的客观物理规律和一般设计规则 ,在新设计时同样有用 ,进行实例结构的信息交换时应该考虑并满足。然后对基于实例的演化设计系统中的演化操作进行了阐述 ,从而提供了一条系统设计的新思路。     

Thermoelastoplastic Deformation Analysis of Electromechanical Equipments under Electrocaloric Shock

A coupled thermomechanical model is presented to investigate the thermoelastoplastic deformation mechanism of electromechanical equipments under the condition of electrocaloric shock. In the coupling model, differentiating from the previous analyzing viewpoint that looked upon deformation work as additional heat source, temperature- field equation is established by considering the weakening role of deformation work on the intensity of internal heat source; in the process of setting up displacement-field equation, G-derivative of nonlinear functional is introduced into the traditional theory of elastoplastic finite deformation to simplify the expression of structural stiffness; stress-field equation is constructed by using the least square method to improve the stress solution obtained by constitutive equation. The presented model is converted into finite element program to simulate deforming process of 3-D structures with temperature-dependent material properties. As an example, thermal deformation analysis of Shanghai metro cars＇ brake resistor is performed and compared with experimental results for illustrating the validity of the presented model.     

Application of Automated Guided Vehicle (AGV) Based on Inductive Guidance for Newsprint Rolls Transportation System

Introduction AutomatedGuidedVehicles(AGVs)findapplication inindustrialindoorandoutdoorenvironmentstransporting rawmaterialsfromthewarehousetotheshopfloor, componentsfrommachinetomachineandthefinished productsbacktothewarehouse[1,2].Owingtothegreat applicationofAGVs,theywillplayanimportantroleinthefuture.Thistendencyhasattractedattentionofmany researchersintheareaofengineering,computerscience, locomotion,andsoon[2,3,4].Inthispaper,aneffective approachtoapplyAGVstotransportnewsprintrollsi…     

波纹管抗扭刚度的计算

在钱伟长教授对旋转壳抗扭刚度的薄膜解的基础上,推导出U型和C型波纹管抗扭刚度的积分计算公式,指出相应EJMA标准计算公式的不足之处,给出相应的修正公式．选用波纹管试件,采用上述计算方法分别计算,并用有限元分析进行了验证．结果表明,采用积分法得到的抗扭刚度,与有限元分析结果几乎完全一致;采用EJMA标准计算的结果比前两者低很多;而其修正公式得到的结果与前两者较接近。     

混合变量多目标优化设计的Pareto遗传算法实现

提出了一种用Ｐａｒｅｔｏ遗传算法来实施的带约束的多目标混合变量的优化方法。得到Ｐａｒｅｔｏ最优解集,决策者从中可选出满足设计需要的解。该算法包括６个基本算子：选择、变异、交叉、离散变量圆整算子、小生境、Ｐａｒｅｔｏ集合过滤器。建立了用于多目标优化的适应度函数,使用模糊罚函数法法将带约束的多目标优化问题转换为无约束优化问题,同时提出了处理混合变量多目标优化问题中离散变量的方法。最后用算例说明了该方法     

基于估计参数辨识递推算法用于输出间断采样条件下的线性系统参数辨识

最小二乘法是用于连续采样条件下线性系统参数辨识的常用算法,但在间断采样条件下,最小二乘法存在很多不足.提出一种基于估计的参数辨识递推(EBRLS)算法,并从理论上分析了其收敛性.仿真研究表明,对于普通辨识算法无法处理的间断采样情况.EBRLS可以给出令人满意的参数辨识结果,甚至在可用数据极其稀疏的情况下仍然有效.