自由曲面上喷涂机器人喷枪轨迹规划方法研究

提出了一种自由曲面上的涂层生长模型及喷涂机器人喷枪轨迹规划方法,选取时间和涂层厚度作为优化目标,寻找喷枪沿指定路径的最优时间序列,通过求解带约束条件的多目标优化问题,找到了一条能使工件表面上涂层厚度方差最小且喷涂时间最短的喷枪轨迹。本文的优化方法将最优变量个数从一般喷枪轨迹规划问题中的6个(代表喷枪的位姿)减少为1个,从而大大简化了问题的复杂性。     

车削循环加工编程技巧

为了提高数控编程效率,克服循环加工编程难点,针对积累循环车削加工,如锥体、球体等编程技巧进行了介绍,给出了相应的编程实例。     

土工合成材料不同位置加筋效果的对比分析

运用所编制的计算程序分析了堤坝下土工合成材料的加筋效果，揭示了土工合成材料不同位置的加筋效果，对比探讨了软基路堤与密实地基路堤的加筋效果，并且采用动态规划法搜索的临界滑动面对不同位置的加筋效果进行分析。     

开放经济市场体系中宏观产出最大化的数学模型

通过研究论述开放国民经济市场体系与宏观产出问题，建立了一个宏观产出的最 大化优化模型．并通过对这一数学模型分析最后探讨对其求解的各种可行的有效方法．     

A multi-objective train scheduling model and solution

This paper develops a multi-objective optimization model for the passenger train-scheduling problem on a railroad network which includes single and multiple tracks, as well as multiple platforms with different train capacities. In this study, lowering the fuel consumption cost is the measure of satisfaction of the railway company and shortening the total passenger-time is being regarded as the passenger satisfaction criterion. The solution of the problem consists of two steps. First the Pareto frontier is determined using the -constraint method, and second, based on the obtained Pareto frontier detailed multi-objective optimization is performed using the distance-based method with three types of distances. Numerical examples are given to illustrate the model and solution methodology.     

模糊环境下土石方调配模型与算法研究

主要研究模糊环境下土石方调配问题。通过对模糊环境下土石方调配系统组成、土石方调配关系的系统分析,以系统费用最低为目标,建立了模糊规划模型。基于可信性理论和不同的决策准则,建立模糊期望值模型、机会约束规划模型及相关机会规划模型,并设计了求解模糊规划模型的自适应遗传算法。算例证明了模型与算法的可行性。     

Pro-active optimal control for semi-active vehicle suspension based on sensitivity updates

This article suggests a strategy to control semi-active suspensions of vehicles in a pro-active way to adapt to future road profiles. The control strategy aims to maximise comfort while maintaining good handling properties. It employs suitably defined optimal control problems in combination with a parametric sensitivity analysis. The optimal control techniques are used to optimise the time-dependent damper coefficients in an electro-rheological damper for given nominal road profiles. The parametric sensitivity analysis is used to adapt the computed nominal optimal controls to perturbed road profiles in real time. The method is particularly useful for events with a low excitation frequency such as ramps, bumps, or potholes. For high-frequency excitations standard controllers are preferable; so we propose a switched open–closed-loop controller design. Various examples demonstrate the performance of the approach.     

含装卸工调配的物流车辆配送路径问题的研究

考虑到物流配送车辆路径问题中要涉及货物的装卸作业,将装卸工调配问题和车辆路径问题相结合提出了含装卸工调配的物流车辆配送路径问题,给出了以总运输费用最小、总装卸工人数最少为目标函数的双目标0-1混合整数规划问题的数学模型.按目标函数的主次分2个阶段对该问题进行求解;最后,将装卸工人数最少转化为装卸费用最小将该模型进行了推广。     

数控加工技术浅析

数控加工技术已广泛应用于制造业中,努力发展数控加工技术,并向更高层次的自动化、柔性化、敏捷化、网络化和数字化制造方向推进,是当前机械制造业发展的方向.