A new parking control method is proposed to guide the parking of auto-guided vehicle(AGV) which has two working patterns:normal pattern and parking pattern,and is used for tran-sporting containers in port.An optimal path from current place to ready-to-parking place is planned first;then FLC is used to guide AGV to follow the planned path;the control parameters within membership function are optimized by using genetic algorithm(GA) to reduce the tracking error between real running path and the planned path.Numerical results show that this method is feasible and effective.

针对集装箱起重机复杂的动力学模型,使用ANSYS软件对其有限元模型进行结构动力修改.首先通过模态分析确定结构的振动特性,确定优化目标;以关键部位的板厚为设计变量进行优化,并对优化结果作了灵敏度分析以判断离散设计变量的取值方向.优化结果较大地提高了集装箱起重机的动力性能,表明了ANSYS软件能处理复杂模型动力学优化问题的可行性和有效性.

Parameter optimization is considered in this paper to improve stability of automatic guided vehicle(AGV),and the restriction of parameters is relaxed in order to make AGV system more stable.Three conclusions can be drawn from simulation: stablilization control parameters have great influence on the stability of AGV;the optimal parameters are different if original position of AGV is changed;the stability of AGV can be greatly improved by optimizing control parameters.

Tracking precision of automatic guided vehicle(AGV) is greatly influenced by the parameters in control law.To deal with this problem,control variables are switched to wheels at first to allow the control strategy being carried out in real control system,then,parameter optimization using Genetic Algorithm is carried out in this paper to reduce tracking errors.Three viewpoints can be drawn from simulation: 1.tracking control parameters have great influence on tracking precision;2.the same parameters have different influence on tracking precision if original position of AGV is changed;3.tracking precision can be greatly improved by optimizing control parameters.

目前我国所建造的体育场均采取露天形式,在建的南通体育场大胆采用了开闭屋盖结构,造型类似"飞碟",屋盖可开闭自如,这在国内尚无先例.

According to stress minimization and material utility,which are two major aspects of structural optimization in a wide range of engineering designs,a stress estimate parameter is introduced and derived in this paper.Then a new stress criterion is presented for the problems of minimizing the maximum stress while low-stressed elements are removed.On the basis of finite element analyses stresses and stress estimate parameters,a new evolutionary structure optimization method and its procedure are proposed.During structural topology optimization,it can deal with the effect of both local von Mises stress level and structural intrinsic cross property.Comparison between two different methods on a cantilever optimization is made.The numerical example demonstrates that the proposed method is of great capability in reducing maximum von Mises stress,and is more valid and effective than the conventional evolutionary structural optimization(ESO) method based on stresses.

This paper focuses on path planning and fuzzy logic controlling of an automatic guided vehicle (AGV)in partially known environment.A method combined of global path planning and local fuzzy logic con- trolling is proposed.This method can not only effectively utilize the known environment information,but also offer a short path that is free of obstacles.Simulation results show that the method proposed by this paper is of effectiveness and is suitable for application.

In order to deal with the complexity and the design variables disunity of dynamics shape optimization for truss structure, a real encoding technique is employed in this paper and, an optimization method for truss considering dynamics requirement, based on adaptive genetic algorithm, is proposed. A numerical example shows that the method proposed in this paper is of good engineering application.

基于遗传算法和梯度算法,文章提出了一种结构优化的混合方法.算例表明该方法兼具遗传算法的优良全局搜索能力和梯度算法的强大局部搜索的特点,且具有很好的工程适应性.

本文提出了一种基于遗传算法和梯度算法的桁架动力学形状优化方法,该方法综合了梯度算法的快速收敛与遗传算法的全局搜索能力.算例表明了本文方法的有效性和工程适应性.

Considering the requirement of bridge loading feature and its material property, a Bi-directional Evolutionary Structural Optimization method is proposed based on the principal stress optimization criterion. This method is of two functions of removing and restoring elements, on the basis of sufficiently considering the material tension and compression property. Numerical examples show that the proposed method can give more optimal structural topology.

该文以悬臂梁为研究对象,对不同位置的裂纹所引起的动态响应进行数字仿真,并对所获取的信号利用小波包网络进行信号分解,提取能量特征和非线性建模,从而实现了裂纹位置的识别,仿真结果令人满意.

从工程应用的观点,提出了一种结构损伤估计方法.首先,构造一种能建立测量模态参数与损伤子结构之间关系的子结构综合法.对于完好子结构,在用广义坐标进行测量模态振型的扩阶过程中,这种子结构综合步骤能减少未知参数个数.基于上述思路,导出一套损伤辨识方程.然后,引进两步损伤辨识近似法:第一步采用损伤定位算法的改进形式,辨识结构损伤的一般区域;第二步是用一种结合灵敏度法和矩阵修正法的混合方法确定结构损伤的程度.仿真算例显示,即使在大的噪声环境下,该方法亦具有好的损伤辨识精度和好的工程应用适应性.