极小化总完工时间批调度问题的两种蚁群算法

针对考虑工件尺寸不同,求解目标为极小化总完工时间的批调度问题,考虑不同的编码方式,提出了基于工件序列的蚁群算法和基于批序列的蚁群算法.基于工件序列的蚁群算法算法采用传统的工件序列编码,需要启发式规则进行分批;基于批序列的蚁群算法算法利用蚁群算法构建性编码的特点,不需要启发式规则,而采取直接分批的方式编码,充分发挥蚁群算法自身的搜索能力.针对总完工时间的优化目标,基于批序列的蚁群算法算法引入批权重构建启发式信息;针对批调度特有性质,基于批序列的蚁群算法算法加入新的信息素更新变量,设置不同的信息素初始值,并采用局部优化技术等改进措施,以克服传统蚁群算法收敛速度慢,易陷入局部最优的缺点,通过对比实验验证了所提算法的有效性.     

用于玻璃幕墙清洗作业的爬壁机器人系统

爬壁机器人是一种极限环境作业机器人 ,它有着极为广泛的应用前景。主要介绍了一种新型用于高楼玻璃幕墙清洗的壁面爬行机器人的本体结构、控制系统以及它的清洗作业系统。     

基于ANSYS的桁架结构有限元分析

有限元极限分析法兼有数值分析法与经典极限分析法两者的优点,特别适用于岩土工程的分析与设计。有限元定义:把连续体分拆成有限的部分,进而求解离散的集合体。有限元技术的特点:缩短产品开发周期、分析产品破坏原因、发展与建立材料模型等。有限元是门很深的计算科学,ANSYS软件是有限元计算的软件工具之一。     

一种多吸盘爬壁机器人原型的研制

介绍了一种仿坦克的爬壁机器人原型设计，该机器人新颖之处在于采用多个吸盘组成的吸附机构和单链条爬行及转向机构，它可以在玻璃幕墙和船壳等墙面上连续爬行，并有一定的越障能力。主要阐述了爬壁机器人关键结构的设计、安全性分析、转弯技术和越障实现的设计思想，并简要对其控制系统进行了介绍。     

加强除杂、除尘和梳理,提高气流纱质量

由于气流纺纱不但具有高速高产、节省劳力、简化工序,而且具有纺出的纱条干均匀、棉结杂质少、耐磨、易染等优点,因此,气流纺纱正在得到飞速的发展。84年我厂从捷克引进的十台BD—200—RCE气流纺纱机1属于第二代水平的机器。这种气流纺纱机虽然带有排杂装置,但由于前道设     

Approximate Relativistic Solutions for One-Dimensional Cylindrical Coaxial Diode

Two approximate analytical relativistic solutions for one-dimensional,space-chargelimited cylindrical coaxial diode are derived and utilized to compose best-fitting approximate solutions.Comparison of the best-fitting solutions with the nuerical one demonstrates an error of about 11% for cathode-inside arrangement and 12% in the cathode-outside case for ratios of larger to smaller electrode radius from 1.2 to 10 and a voltage above 0.5MV up to 5MV,With these solutions the diode lengths for critical self-magnetic bending and for the condition under which the parapotential model validates are calculated to be longer than 1 cm up to more than 100cm depending on voltage,radial dimensions and electrode arrangement.The influence of ion flow from the anode on the relativistic electron-only solution is numerically computed,indicating an enhancement factor of total diode current of 1.85 to 4.19 related to voltage,radial dimension and electrode arrangement.     

Characteristics of Coaxial Vircator in Three Specific Configurations

As a novel vircator device, the coaxial vircator can attain much higher efficiency than the common virtual cathode oscillator. In this paper, coaxial vircators in three specific configurations are studied to describe the efficiency and frequency characteristics and their dependence on geometric parameters. The PIC (Particle in Cell) simulation results show that a power efficiency over 11% can be obtained from the coaxial vircator with a finite inner anode conductor, and a narrow-band output can be achieved. A direct-coupled coaxial vircator has a slightly lower efficiency of about 8%, but in this configuration the efficiency is not strongly dependent on the geometry parameters. The introduction of a reflecting cavity can effectively improve the efficiency under certain parameters. Meanwhile, the research results also indicate that improper cavity parameters will countervail some inherent advantages of the configuration with a finite inner conductor, leading to lower efficiency than that of the direct-coupled one. Meanwhile, an experiment was also carried out to testify the simulation results, and a power efficiency over 3% was obtained from the direct-coupled coaxial vircator.     

陶瓷写意花鸟创作随感

写意花鸟画是传统中国花鸟画的一种表现形式,与国画工笔花鸟画相对而言,凡兼工带写、大小写意均属＂写意＂或＂意笔＂,通称写意花鸟画或意笔花鸟。而花卉、禽鸟作为自然的象征,无论在绘画领域,还是在工艺美术领域,都是长盛不衰的题材。唐代书法高度成熟,书画合一的理论为人们所重视     

定风量阀、变风量阀在空调系统中的应用

介绍定风量阀、变风量阀在空调系统中的应用,并说明在工程中适当运用定风量阀,变风量阀可优化系统设计,有利于空调系统送、回风的平衡,减少系统调试工作量.     

快递纸箱包装机合页机构设计

针对目前快递纸箱普遍依赖人工包装导致效率低的问题,设计了新型快递纸箱合页机构。采用阶梯轴结构和步进电机,实现合页机构的驱动功能;采用凸轮和连杆机构,设计了合页机构的传动和执行部分;利用Solid Works2014软件1:1建立合页机构的三维模型,解决了机构的干涉问题,并结合ANSYS软件实现合页机构的稳定运行;采用机器人正逆运动学理论分析合页机构中各关节之间的位置和姿态。应用结果表明合页机构具有安全、省力及能耗低等优点,能提高快递纸箱的包装效率,并可有效降低工人的劳动强度。