产品研发过程管理信息集成建模方法研究*

为了实现制造企业产品研发过程多目标全局集成管理和综合优化,提出了基于活动及其实现过程(ProA)的信息集成建模方法。建模过程中详细讨论了产品研发ProA数学模型、ProA信息模型设计策略、ProA信息存储方案和ProA基础信息模型。基于MVC提出了ProA的信息系统设计结构,为ProA信息系统设计奠定了基础。     

基于WEB工作流的动态绑定建模技术研究

工作流技术是实现业务流程建模、仿真、优化、集成的有效手段之一。尤其是基于WEB的工作流动态建模技术,是增强信息系统业务流程互联互通、实现业务流程动态可配置、流程优化重组的有力措施。文章首先分析了工作流控制模型,然后构建了基于WEB的多流程工作流协同控制体系。采用基于XML的技术方案给出了流程初始化定义的配置框架,通过工作流引擎调用WEB服务描述语言WSDL,实现了面向web服务的多流程动态绑定。达到了实际业务流程逻辑与流程组织逻辑分离的目的。     

基于ProA的产品开发过程建模

为了有效对制造企业产品开发过程管理,在应用IDEF0模型、分层Petri网和面向对象设计方法并在分析活动和过程关系的基础上,提出了基于活动及其实现过程(ProA)建模单元的过程模型的建立方法.详细对ProA数学建模,定义了ProA、ProA的输入/输出展开、ProA建模单元的典型运作、产品开发过程建模步骤.通过基于ProA的机电产品开发过程建模实例研究说明了其实用性.     

面向产品研发的过程模型建立

为了有效对制造企业产品研发过程进行管理,提出了基于活动及其实现过程(ProA)建模单元的过程模型的建立方法。建模过程中详细讨论了产品研发过程集成管理、ProA的信息化和研发过程建立步骤。通过机电产品研发过程建模实例研究说明了其实用性。     

ERP系统中查询子系统的柔性化设计

介绍了ERP系统中实现柔性动态查询的一种解决方案.在该方案的设计与实现过程中,用到了逐层分解、标准化、数据控制流程等柔性化设计思想.系统能动态地根据用户的配置调整查询界面的生成,并且当用户需求在一定范围内发生变化时,只需做简单配置即能自动调整界面,而无需对代码做任何调整.这不仅方便了用户使用,同时也大大提高了软件的可重用性.     

基于特征匹配的自定义审批模型

为适应企业的业务审批流程变更,提高信息系统柔性,提出一种自定义审批模型及其实现方案。审批流程被分解为对象、自定义审批过程和角色等特征的集合,特征被定义为类型、属性、状态的元组,通过特征映射匹配实现审批过程的动态配置和实时变更。在某企业集团化进程中,该模型的应用节省近90%因审批流程变更引起的系统调整时间,表明了该方案的有效性和实用性。     

微粒群算法在传感器优化配置中的应用

为了将动态测试中的传感器配置在合理的自由度,以便充分反映结构的动力特性,需对传感器进行优化配置.分别以MAC矩阵、Fisher信息阵,及其组合为优化准则,采用微粒群算法,对传感器优化配置问题进行了研究,探讨了优化准则和优化算法对传感器优化配置结果的影响.通过与模态动能法、有效独立法及基于QR分解的逐步累积法比较,传感器优化配置的结果表明微粒群算法优于上述方法.     

DSP在线升级与资源优化再配置

基于TI TMS320C5410,提出数字信号处理器(DSP)内的一种动态程序加载技术,研究并实现DSP的在线升级与资源优化再配置。利用该技术解决DSP中原有bootloader程序的局限性,使DSP在启动时可选择性地加载应用程序,实现DSP内资源的优化配置和程序运行过程中的动态程序加载与释放,对DSP内的资源进行优化再配置。通过开发设计在线程序写入,实现DSP内程序的在线升级与在线 调试。     

基于模板流程配置的Web信息抽取

针对Web信息抽取中存在的包装器构造复杂及抽取精度等问题,提出并实现了一种基于模板流程配置的Web信息抽取框架。将用户请求、访问和获取Web页面的动作进行分解,抽取其中的动作模式,并映射到流程配置模板中的节点。通过流程解析器对用户创建的流程配置XML描述文档进行解析,抽取感兴趣的信息。试验结果表明,系统可快速、准确地实现抽取。     

雷达故障测试路径动态优化方法研究与实现

为了优化自动测试流程以及将故障诊断算法动态插入到雷达故障诊断循环中,提出了一种新的测试软件框架.该软件框架将雷达故障状态测试流程与故障诊断算法流程分离,使得测试流程与算法流程可以成为计算机中不同的线程或进程.基于该软件框架,定义了一种测试流程优化目标函数.利用此函数,讨论了一种基于预定义测试流程的动态优化方法.实现了在测试人员自主修改测试路径后,默认测试流程自动优化.     

容错控制系统动态稳定的控制率重构

针对反馈系统中的传感器故障,基于非线性优化提出两种动态稳定的容错控制律重构设计方法。算例表明本文方法的有效性。     

调速泵结构配置协调分解优化算法及实现

建立多级调速泵结构配置连续非线性规划和整数非线性规划二阶段模型.非线性整数规划子问题采用外逼近算法求解.针对连续非线性规划主问题,提出基于割角法的可行域协调分解优化算法,证明割角法陷阱问题并建立判断准则排除已知的陷阱区域,在此基础上构建系列松弛问题得到原优化问题渐进收紧的下界估计,并最终收敛到原优化问题全局最优解.三级调速泵结构配置实例验证了算法的有效性,并给出与其他算法的比较结果.     

Selection and impact of different topologies in multi-layered hierarchical fuzzy systems

An evolutionary algorithm based approach for selection of topologies in hierarchical fuzzy systems (HFS) is presented. Coupling fuzzy system with evolutionary algorithm provides a solution to the automated acquisition of the fuzzy rule base. It is difficult to study the problem of hierarchical decomposition for a large class of fuzzy systems but it is possible to analyse such architectures on the example of a particular fuzzy system, such as inverted pendulum. Topology of the HFS must be selected according to the physical properties of the dynamical system under consideration. Different HFS topologies for an inverted pendulum system are investigated and analysed to address the problem of how input configuration in multi-layered structure affects the controller performance. The experiments are conducted to test controller performance for different topologies of the hierarchical fuzzy system. The impact of different topologies on control process is discussed. The results from the case study of inverted pendulum can be extended to other dynamical systems.     

Crashworthiness optimization of helicopter subfloor based on decomposition and global approximation

This work deals with the development of an optimization procedure under crashworthiness requirements applied to a typical helicopter subfloor. The difficulties due to the nonlinear design space and structural behaviour are overcome by developing an optimization procedure based on decomposition, where the structure to be optimized is converted into a set of smaller and linked substructures. To evaluate the response of each substructure, global approximation strategies, based on neural networks, are used. Size variables (dimensions, thickness) and geometrical variables (element number and position) are considered in order to maximize the global crashworthiness performance. The energy absorbed per unit mass by the subfloor is chosen as objective function and acceleration constraints are considered. Genetic algorithms are used to find the optimal configuration. The optimization allowed an increase in the crush force efficiency of 12% and a decrease in the subfloor mass of 4%. A significant CPU time saving was also obtained.     

动态高斯变异和随机变异融合的自适应细菌觅食优化算法

针对细菌觅食优化(Bacterial Foraging Optimization,BFO)算法在高维函数优化上性能较差和普适性不强的问题,提出一种动态高斯变异和随机变异融合的自适应细菌觅食优化算法.首先,将原随机迁徙方案修改为动态高斯变异与随机变异融合的迁徙方法,即搜索前期利用随机迁徙有利于增加解的多样性,获得全局最优解,搜索后期改用动态的高斯变异来提高算法的收敛速度;然后,对趋化操作中的步长参数使用动态调整和自适应调整来增强算法的普适性;最后,构建全局极值感应机制使优化更有效,从而获得了一种高性能的自适应BFO算法,以便能够高效解决高维函数的优化问题.14个高维函数优化的仿真结果表明,提出的算法不仅优化效果好、普适性强,而且能以更快的速度找到全局最优解,性能优于SBFO、POLBBO、BFAVP和RABC算法.     

SVD algorithms to approximate spectra of dynamical systems

In this work we consider algorithms based on the singular value decomposition (SVD) to approximate Lyapunov and exponential dichotomy spectra of dynamical systems. We review existing contributions, and propose new algorithms of the continuous SVD method. We present implementation details for the continuous SVD method, and illustrate on several examples the behavior of continuous (and also discrete) SVD method. This paper is the companion paper of [L. Dieci, C. Elia, The singular value decomposition to approximate spectra of dynamical systems. Theoretical aspects, J. Diff. Equat., in press].     

Spincopter Wing Design and Flight Control

This paper presents dynamical properties of an unmanned aerial vehicle (UAV), called spincopter. The vehicle structure is based on two wings that are forced in rotation (spinning) by propulsion system formed of two propellers. Based on devised dynamical model, that reveals inherent stability of the vehicle, composition of control algorithms for vertical and horizontal movement is proposed. Due to the specific configuration of the propulsion system, movement in horizontal direction is produced by pulsations in rotational speed of propulsion motors. An analysis of influence that such a configuration has on the vehicle dynamics is given. Finally, design recommendations for rotational wings are elaborated, based on extensive simulations of spincopter by using X-Plane® software package.