基于自适应支配准则的高维多目标进化算法

基于松弛支配的高维多目标进化算法（Many-objective Evolutionary Algorithms,MaOEAs）由于能够有效地提高区分解的能力,受到广泛关注,但该类大多数算法处理不同目标的优化问题时普适性较差.针对这个问题,本文提出一种基于自适应支配准则的高维多目标进化算法（Adaptive Dominance Criterion Based Evolutionary Algorithm for Many-objective Optimization,ADCEA）.首先,自适应准则（Adaptive Dominance Criterion,ADC）根据目标空间中相邻解间的角度信息和目标数目,设计一种自适应小生境方法,并结合收敛性指标信息,实现对候选解的非支配排序.然后,为了进一步增强种群的多样性,在环境选择中引入参考向量分割种群技术;最后,构建合理的适应度函数,并根据适应度值大小选取收敛性和多样性较好的非支配解集.实验证明,本文所提的方法在处理不同目标的优化问题时普适性提高,并在平衡种群的收敛性和多样性上取得显著效果.     

A decentralized control scheme for orchestrating versatile arm movements in ophiuroid omnidirectional locomotion

Autonomous decentralized control is a key concept for understanding the mechanism underlying the adaptive and versatile behaviour of animals. Although the design methodology of decentralized control based on a dynamical system approach that can impart adaptability by using coupled oscillators has been proposed in previous studies, it cannot reproduce the versatility of animal behaviours comprehensively. Therefore, our objective is to understand behavioural versatility from the perspective of well-coordinated rhythmic and non-rhythmic movements. To this end, we focus on ophiuroids as a simple good model of living organisms that exhibit spontaneous role assignment of rhythmic and non-rhythmic arm movements, and we model such arm movements by using an active rotator model that can describe both oscillatory and excitatory properties. Simulation results show that the spontaneous role assignment of arm movements is successfully realized by using the proposed model, and the simulated locomotion is qualitatively equivalent to the locomotion of real ophiuroids. This fact can potentially facilitate a better understanding of the control mechanism responsible for the orchestration of versatile arm movements in ophiuroid omnidirectional locomotion.     

三相电压型SVPWM整流器高速实时仿真系统

针对三相电压型空间电压矢量脉宽调制(SVPWM)整流器实现复杂、实时控制要求高和需要高速CPU的特点,提出了基于FPGA的VHS-ADC高速信号处理系统构建三相电压型SVPWM整流器的高速实时仿真系统.论述了VHS-ADC高速仿真平台与主电路的通用接口板电路以及过电流保护电路.设计了高速仿真系统实验装置,通过接口板实验...     

基于某型投放装置的通用性测试软件设计

以某型投放装置测试软件的设计为背景,考虑到多种测试仪的测试任务的共性与特点,提出了软硬件相结合的的通用化设计方法;描述了其流程化、自动化、层次化的测试方式;对其各部分功能和通用性进行详细介绍;经过测试和使用,该软件平台通用性能好,操作简单,其通用性对各类测试系统的设计和发展有着重要的意义。     

纸基复合包装材料的应用现状及发展趋势

本文论述了纸基复合包装材料的主要性能,分析了其主要的应用领域。通过阅读文献,研究其现存的主要问题和需要改进的方面,归纳出了纸基复合包装材料的现状及其今后的发展方向。     

筒形件多功能水平切边模

针对目前对无凸缘筒形件在车床上车削进行水平切边的高成本、低生产率的状况,设计了对不同尺寸的旋转体、非旋转体筒形件水平切边模。介绍了模具的结构、特点及工作过程。模具采用了凸轮槽导板、双弹顶装置,经生产实践证实,模具结构合理、通用性好、切边质量稳定、生产效率高、成本低,有很好的技术经济效益。     

制浆材近红外光谱在线检测系统设计

针对制浆木材原料主要理化指标现场快速检测的需要,以微型近红外光纤光谱仪为基础,设计了一套制浆材在线检测系统。该系统由制浆材光谱采集平台、光谱仪测控软件和光谱数据分析及管理软件三个部分组成。其中测控软件独立编译,光谱仪的通信接口函数模块化封装,以提高对不同型号近红外光谱仪的通用性,便于在实际生产中推广应用。通过实验模拟制浆生产过程检测表明,系统运行稳定、快速,检测结果达到工业质量控制要求,为制浆材在线快速检测提供了一种可行的解决方案。     

Flexibility and types of changes in FMSs: A timed petri-nets assessment of machine flexibility

This paper discusses the flexibility concept in the light of the production-systems capabilities needed to cope with changes occurring at different time horizons. Two basic flexibility components emerge: set-up (in time units) and variety (operations and transfer). The paper further describes a timed Petri-nets approach to machine-flexibility evaluation (set-up and operations variety). A timed Petrinets decomposition technique is used to derive measures of flexible machines' performance under changes that a flexible system has to cope with, such as failures, changeover interruptions, fluctuations in demand, and re-routing.     

六缸气缸体砂型铸造下芯夹具的通用性优化设计

运用美学、绩效理论以及黄金分割原理的设计理念,优化设计制作了气缸体多品种铸造通用下芯夹具典例.对其底框、浮动框、砂芯夹板、砂芯钩块等主要零部件结构的优化及通用性进行了评述.其优化设计理念,也可适用于其他铸造工装的优化设计.