线性广义系统的区间观测器设计

本文研究了连续时间线性广义系统的区间观测器设计问题.首先根据正系统的稳定性判据提出了一种基于线性矩阵不等式的广义区间观测器直接设计法,然后通过引入更多的设计自由度进一步放宽了区间观测器的设计条件,扩大了设计方法的适用范围.所提出的设计方法无需坐标变换,是一种直接设计方法.最后,通过两个仿真算例验证了所提出方法的有效性.     

基于FPGA和DSP的自动报靶系统

提出了一种基于DSP和FPGA 的自动报靶系统的设计方法,主要阐述了系统的软硬件设计方法,并提出用模糊聚类分析识别靶心。对比其它设计方法,该方法适应性强、灵活性高,设计调试方便。     

风力机叶片气动外形三维设计方法研究与应用

本文针对风力机叶片气动外形的设计现状,采用Schmitz设计模型,结合小型叶轮设计实例,提出了风力机叶片的三维设计方法。利用图形几何变换原理求解叶片各截面叶素的空间坐标,运用三维设计平台进行叶片三维实体建模,设计过程交叉组合,提出了三种设计方法,并分析了各自的特点。方法具有普适性,有助于提高叶片的设计质量和设计效率,为叶片气动外形的三维快速设计提供了参考。     

SoC设计中虚部件构建与封装方法研究

近年来,软硬件协同设计技术受到了系统级设计语言和基于平台设计方法的深刻影响。本文提出了一种基于层次平台的SoC系统设计方法,将SoC系统设计过程分为系统层、虚部件层和实部件层三个设计层次。分析了在虚部件层中设计虚部件时必须满足的三个方面的需求,提出了一种新的虚部件构建和封装方法。     

PDM环境下基于实例推理的变型设计技术研究

针对建立实例库时存在的问题,对基于实例推理的变型设计进行了研究,提出了在PDM环境下建立实例库的方法.分析了实例推理的一般过程,提出了一种基于实例推理的变型设计求解模型,在此基础上, 以汽车产品为例,提出了一种变型设计的检索方法,为实现汽车产品的变型设计奠定了基础.     

基于装配的柔性化家具CAD设计技术和方法

文章讨论了基于装配的CAD设计技术,提出了基于装配柔性化家具CAD设计思想和方法,并详细地描述了该设计系统具体实现方法。     

基于平台的SOC设计方法研究

论文分析了可重用设计方法和软硬件协同设计方法,提出了一种适合基于平台设计的更细粒度、可更快捷地实现设计重用和软硬件协同设计的结构。     

变型设计中的基因模型与产品优化方法实现

为了进行快速的变型设计,需要一个合理的产品结构设计模型,据此提出一种基于产品基因的新的变型设计方法。建立了支持变型设计的产品基因模型及其操作序列,并由此构建出产品优化模型。运用人工免疫算法得到了产品变型设计的最终优化结果。最后结合一种典型的机电产品验证了文中提出方法的合理性和有效性,为产品变型设计理论提供了另一种结构设计方法和优化方法。     

基于手势和草图的概念设计协同交互的研究

基于手势和草图的交互模式提供了一种自然和谐的方式来支持概念设计协同操作,促进协同工作系统的发展与应用．基于以用户为中心的设计,比较了不同方式的概念设计过程,提出了基于手势和草图的协同设计方法,进一步讨论了以草图为设计过程中的信息载体,分析了草图信息模型;基于手势操作,提出了协同上下文感知的概念和协同设计上下文描述模型;最后分析并给出面向同步编辑的草图交互设计和双向约束求解方法．所提出的协同设计方法自然简便,提高了设计效率,改善了人机交互方式．     

基于INA设计方法的多变量PID控制器设计方法

在查阅总结大量相关文献的基础上,本文提出了一种基于逆Nyquist阵列（INA）设计方法的多变量控制器设计方法。在简要介绍了设计方法的理论基础和相关概念（极限点以及极限增益和极限频率）的基础上,以TITO多变量控制系统为例,简述设计思路,并给出其推导过程及其设计步骤;并借助仿真实验,与文献[8]所提出的设计方法进行了一系列的对比仿真实验,并给出了相关的分析和结论。     

Design of steel frames for specified seismic member ductility via inverse eigenmode formulation

A new direct method of ductility design is presented for planar moment-resisting steel frames such that a set of member stiffnesses and the corresponding member strengths of a frame with realistic cross-sectional proportions are found for a specified distribution of member ductility factors under design major earthquakes. An inverse method of stiffness design is developed such that every predominant member-end strain in a frame under design earthquakes estimated on the basis of lowest eigenvibration would coincide with the specified value. A concept called ‘a set of similar cross-sections’ is introduced to make it possible to obtain a set of members with realistic cross-sectional proportions. It is then shown that this inverse formulation for specified predominant member-end strains is quite useful for developing a direct stiffness design method for specified mean maximum member-end strains under design earthquakes. It is further demonstrated that, if a frame is designed elastically for specified ductility factors based on a new concept of a ‘virtually elastic frame’ even under design major earthquakes, then the so-designed frame exhibits the desired response ductility characteristics specified for inelastic frames. Several design examples are presented to illustrate the usefulness of this design method and time history response analyses are performed to demonstrate the validity and accuracy of this design method.     

Investigating a domain-key scheme of a relational database

A new approach to the synthesis of the domain-key normal form (DK/NF) for an arbitrary domain is used to analyze some criticized publications. A detailed comparison between various anomalies in database schemas, between different approaches to the design of schemas, and between the framework design method and classical and new design methods is made. The coincidence with the results of other studies is shown to be a subsequence of the strict soundness of the method proposed.     

Robust output regulation by observer-based feedforward control

In this paper, a new method for the design of disturbance and reference feedforward controllers with disturbance observers is presented for systems, where the disturbance input location is unknown. The resulting controller achieves asymptotic tracking in the presence of the disturbances despite plant parameter variations and changing disturbance input locations, and is therefore robust. It is shown that the new controller design method is dual to Davison's approach for the application of the internal model principle. However, different from the latter one, the new design procedure allows a simple and complete prevention of controller windup by driving the disturbance observer with the saturated input. Furthermore, a straightforward separate reference channel design is possible in order to improve the tracking behaviour if the types of the reference and the disturbance signals differ. A simple example demonstrates the advantages of the new design method.     

A hybrid surrogate and pattern search optimization method and application to microelectronics

A hybrid method for robust and efficient optimization process is developed by integrating a new response surface method and pattern search algorithm. The method is based on: (1) multipoint approximations of the objective and constraint functions, (2) a multiquadric radial basis function (RBF) for the zeroth-order function approximation and a new RBF plus polynomial-based moving least-squares approximation for the first-order enhanced function approximation, and (3) a pattern search algorithm to impose a descent condition and applied adaptive subregion management strategy. Several numerical examples are presented to illustrate accuracy and computational efficiency of the proposed method for both function approximation and design optimization. To demonstrate the effectiveness of the proposed hybrid method, it is applied to obtain optimum designs of a microelectronic packaging system. A two-stage optimization approach is proposed for the design optimization. The material properties of microelectronic packaging system and the shape parameters of solder ball are selected as design variables. Through design optimization, significant improvements of durability performances are obtained using the proposed hybrid optimization method.     

一个实用的调优技术

文中介绍了一种实用的调优技术，提出了调优过程中一种新颖的试验模型，以三因子新设计试验与正交旋转回归设计试验为例作了分析比较，并介绍了寻找参数最佳工作区域的数学分析方法．     

信号分析系统中的极窄带滤波器的设计与实现

本文描述了一种滤波器设计方法,称为内插级联FIR滤波器,可以实现过渡带极窄的陡峭低通滤波器,在宽带中频采样的信号分析系统中,可以解决分离一个极窄带信号时的低通滤波器设计问题。在采用FPGA硬件实现时,与直接实现的方法相比,该方法可以节约75%-80%的乘法器资源,且结构简单。     

Green product design through product modularization using atomic theory

With increasing environmental consciousness and the establishment of environmental protection regulations, green product design not only plays a crucial role in a modern industry but is also becoming the main focus of the future market. In this paper, an innovative method is presented that uses the concepts of atomic theory to solve design modularization problems for green product design. With the developed method, products can be modularized based upon given green constraints, e.g., material compatibility, part recyclability, and part disassemblability. The developed method can help engineers effectively create green designs in the initial design stage, based on product lifecycle requirements. With green considerations incorporated into new modules, a new design can be created that improves upon an original design, with respect to environmental impacts. Product designers can use our method to compare differences between their original designs and the new green modules and then perform necessary design modifications. A table lamp and a motor are used as case study examples to show the effectiveness of the atomic-theory-based green product design method.     

色彩配置方案的抽取与设计重用CAD方法研究

设计实例中的色彩配置方案往往代表某一类型的设计风格、惯例或趋势,这对新的设计有重要的参考价值和指导意义。论文基于遗传算法研究了从参考设计实例中抽取色彩配置方案、并将其运用于新设计的方法,同时建立了色彩方案的量化评价方法,应用VC++开发了色彩配置方案设计的原型系统。     

Local nonlinear unknown input observer

This paper proposes a new nonlinear unknown input observer. The observer design approach utilizes the first order Taylor expansion. The observer gains are then obtained by a systematic method. In this paper, we added some improvements to this method. The developed approach also can enable observer design for a large class of differentiable nonlinear systems. The necessary and sufficient conditions for the existence of the observer are given. A numerical example is given to illustrate the attractiveness and the simplicity of the new design procedure.