结构优化设计的KFD方法及其在电除尘器本体结构优化中的应用

电除尘器本体结构优化设计是一个规模大,设计变量数多而具有相当难度的几何可调和拓扑可调优化设计问题。对这样一个大型复杂的结构优化问题,本文在文[1]的工作基础上,充分利用结构的力学特性,应用有效设计变量的概念,建立了不用求偏导数且不必解线性规划的可行方向法—KFD方法。该方法具有收敛速度快、占用内存少的优点,比通常ε有效约束可行方向法提高速度数十倍。实际应用的结果表明文中的方法是很有效的。     

Selection of the optimum parameters for sandwich construction with honeycomb core

The minimum weight of sandwich construction which is regarded as objective function has been discussed. Under given constraint condition of the strength or the stiffness, the four optimum parameters of sandwich construction with honeycomb core (thickness of the face t_f, thickness of the honeycomb core h_c, thickness of the honeycomb wall t_s, side length of the honeycomb cell c) are evaluated. By using constraint condition of the strength, a equation of high degree is finally solved. In the constraint condition of the stiffness, the constraint optimization problem is treated as inconstraint optimization problem with the method of obtaining extreme value solution by undetermined parameter multiplication. Also, the results are discussed.     

OPTIMUM DESIGN BASED ON RELIABILITY IN STOCHASTIC STRUCTURE SYSTEMS

IntroductionIn traditional optimum structural math model,the target function and the constraintfunction are all considered as the certain value.But it does not accord to the actual forcedenvironment condition and structural status.Thus the optimum results…     

地震作用下高层钢结构MTMD控制参数取值及优化设计研究

本文对地震作用下结构－MTMD系统的动力特性及优化设计进行了探讨,通过数值分析研究了MTMD系统各设计参数间的关系,给出了MTMD系统最优参数取建设,提出了MTMD系统优化设计及结构－MTMD系统优化设计方法,最后,算例说明了本文方法的应用及MTMD对结构地震反应控制的有效性。     

薄板结构的边界元优化设计

完成了一种用边界元法对弹性薄板结构进行优化设计的计算机分析及彩色绘图系统.本文论述了平板弯曲问题的边界元法及其优化设计.系统采用本文作者提出的三方程协调方案,并精确计算分布荷载的域内积分.本文完成了多个平板弯曲问题的边界元分析算例及板结构边界元优化设计的工程算例.结果表明,本系统方法先进、结果精确可靠,具有十分明显的工程实用价值.     

OPTIMUM DESIGN OF ADHESIVE BONDING OFRESIN-BASE COMPOSITES

I.IntroductionThemajorityofproductsofthefiberreinforcedcompositemateria1sareinthin-walIstructure.Themeritsofcompositesmaybefullyplayedbytheadhesivebonding.Theadhesivebondinghasfollowingadvantages:a.thejointofthesameordifferentkindsofmaterialsmayberealized…     

Epsilon-continuation approach for truss topology optimization

In the present paper, a so-called epsilon-continuation approach is proposed for the solution of singular optimum in truss topology optimization problems. This approach is an improved version of the epsilon-relaxed approach developed by the authors previously. In the proposed approach, we start the optimization process from a relaxation parameter with a relatively large value and obtain a solution by applying the epsilon-relaxed approach. Then we decrease the value of the relaxation parameter by a small amount and choose the optimal solution found from the previous optimization process as the initial design for the next optimization. This continuation process is continued until a small termination value of the relaxation parameter is reached. Convergence analysis of the proposed approach is also presented. Numerical examples show that this approach can alleviate the dependence of the final solution on the initial choice of the design variable and enhance the probability of finding the singular optimum from rather arbitrary initial designs. The project supported by the National Natural Science Foundation of China (10102003, 10032010 and 10032030)     

遗传算法及其应用

本文简要介绍了遗传算法的主要思想，算法基本步骤以及它的主要特点和应用领域，并以几个桁架结构的优化设计为例，说明了遗传算法的全过程。     

双盘悬臂柔性转子--同心型挤压油膜阻尼器系统关于稳态圆响应的参数优选

获得了双盘悬臂柔性转子－同心型挤压油膜阻尼器（ＳＦＤ）系统在ＳＦＤ轴承处的稳态响应的频响特性曲线、盘的频响曲线及传递率曲线。通过求解各方程和分析响应曲线图优选出可以避免出现双稳态和不稳态的参数组合。在给定的参数范围内分析了参数对于各项系统特性的影响,保证了所选能较好地满足各项性能要求,使系统具有优良的稳定性和动态特性。     

管网系统抗震优化设计的正交枚举法

在管网系统总投资限额条件下,以系统抗震可靠度最大为优化目标,进行管网系统的抗震优化设计。根据管网系统的功能要求,设计特点及单元重要性分析,将系统优化变量转化为较少的离散变量,并利用正交枚举法进行简化计算,从而避免了大规模非线性规划求解的困难。     

考虑翘曲时任意截面梁的优化设计

首先以考虑翘曲的位移模式出发，导出了关于变位的控制微分方程和有限元刚度方程；然后通过引入新的坐标变换阵，得出了一般坐标系下关于梁两端任意点Ｐ．Ｑ的刚度矩阵；进而通过引入三种不同层次的变量，给出了数学模型与敏度分析方法。最后采用内切球法解之。将本文方法应用于某汽车主梁的优化设计，取得了合理的结果。     

一种考虑拉弯耦合的复合材料层板的优化设计方法

提出了以层压板分层为基本单位，用满应变设计层板厚度，以应变能原理调整分层比例的二级优化策略，给出了复合材料板壳结构铺层设计的方法，并将其编入COMPASS3．0版本中。工程应用表明，该方法实用可靠，设计效率高，优化设计软件COMPASS为工程技术人员提供了有效的设计手段。     

巧解铅球最佳出手角

利用运动叠加原理通过对铅球运动的恰当分解, 提出了一种计算最佳出 手角的新方法, 并与传统方法就两种不同情形进行了对比, 说明了新方法的物理思想.     

A combinatorial algorithm for the discrete optimization of structures

The definition of local optimum solution of the discrete optimization is first given, and then a comprehensive combinatorial algorithm is proposed in this paper. Two-level optimum method is used in the algorithm. In the first level optimization, an approximate local optimum solution is found by using the heuristic algorithm, relative difference quotient algorithm, with high computational efficiency and high performance demonstrated by the performance test of random samples. In the second level, a mathematical model of (-1, 0, 1) programming is established first, and then it is changed into (0, 1) programming model. The local optimum solution X^* will be from the (0, 1) programming by using the delimitative and combinatorial algorithm or the relative difference quotient algorithm. By this algorithm, the local optimum solution can be obtained certainly, and a method is provided to judge whether or not the approximate optimum solution obtained by heuristic algorithm is an optimum solution. The above comprehensive combinatorial algorithm has higher computational efficiency.Project supported by Natural Science Foundation of Shandong Province     

汽车车架结构参数的优化设计

本文采用有限元和优化设计相结合的方法，恰当地解决了通用约束的非线性规划问题。通过对汽车车架结构特点的分析，提出了车架结构参数优化的数学模型，讨论了车架的各种约束条件，并采用混合罚函数法对实例进行了优化设计。     

钢筋砼圆形贮液池的优化设计

本文研究了钢筋砼圆形贮液池池壁的优化设计问题,文中用插值矩阵法作内力分析,以池壁造价为目标函数,依照设计规范要求,用复合形法求出使目标函数最小时的池壁厚度变化和配筋量。并编制了专用程序。与已有实例比较,本文结果的效益显著。     

天线结构多目标模糊优化设计

本文在结构模糊优化设计理论的最新成果——普遍型模糊优化的基础上研究解决了包括重量、精度、动力基频和安全度等目标在内的天线结构多目标模糊优化设计问题,使得天线结构优化更令面、更合理、更实际。这是在计算机上对多变量、多工况、多约束、多目标大型结构进行模糊优化设计的成功应用的实践。     

结构稳健性设计与考虑不确定因素的优化设计的比较

用典型的三杆桁架结构设计问题，进行了结构稳健性设计与考虑不确定因素的优化设计的比较，通过用蒙特卡罗模拟法对设计结果的结构可靠性计算，表明两种设计在提高结构可靠性上是一致的，但结构稳健性设计更具有有效控制结构特性散布的优点。     

随机神经网络优化方法及其计算机仿真

研究了结构优化问题求解的随机神经网络方法,可较好地克服Hopfield网络方法容量陷入局部解的缺点,针对实例,对随机神经网络和Hopfield网络进行了动态仿真,直观地给出了两种网络的动态并行运行,能量函数的动态变化过程及两种网络的全局性的差异,同时也仿真出了网络并行运行至稳定优化解的时间。     

A micromechanics analysis for the microstructure design of a two-phase pseudoelastic composite

A micromechanics analysis on the possibility of designing a two-phase pseudoelastic composite is made for the case where ductile transformable shape memory alloy plastic particles are imbedded coherently in an elastic matrix. It is demonstrated that a pseudoelastic stress-strain loop in a macroscopic loading-unloading cycle can be obtained by microscopically stress induced forward and reverse martensitic transformations in the SMA particles. The relation between the macroscopic stress-strain response and the material parameters of the constituents of this composite is quantified through the micromechanics calculations, which reveals that the best ductility and thus the greatest energy absorption capacity of this novel microstructure can be obtained by the optimum material design.