基于Simulink的数模混合电路仿真平台设计与实现

针对数模混合电路仿真精度与性能之间的矛盾问题和仿真工业级复杂数模混合电路时仿真工具存在主流芯片和电路模块不足问题,提出了一种粘合模式的数模混合仿真平台模型架构,基于该架构设计并实现了一种基于Simulink软件,通过嵌入数字电路和模拟电路主流仿真引擎获得充足主流芯片和电路模块支持的数模混合电路仿真平台,设计了一种结合了拓扑排序算法的仿真控制方式,实现了对工业级复杂电路进行流程化、模块化的数模混合仿真;最后通过一个能够时序上可以逻辑拆分的典型数模混合电路仿真验证了仿真平台的有效性。     

一种数模混合SoC设计协同仿真的验证方法

数模混合信号仿真已经成为SoC芯片验证的重要环节。文章以一款固网短信电话专用SoC芯片为例,介绍一种使用Synopsys公司的NanoSim-VCS协同仿真环境进行仿真的验证方法,并给出验证结果。     

基于8051内核SoC的模拟验证与仿真

基于8051核进行系统芯片(SoC）的设计能力得到了很大提高，但同时带来了该类芯片特别是采用数模混合设计时的验证和应用仿真问题。本文利用通用8051仿真器，并根据一款以805l为内核系统芯片的验证和仿真要求，提出一种进行SoC芯片模拟验证和仿真的方案；利用该方案，实现对基于805l内核数模混合SoC芯片的模拟验证和仿真。     

数模混合电路故障字典生成技术的研究

复杂装备中复杂模拟和数模混合电路的应用,在提升装备性能的同时,也对电路故障诊断提出了更高的挑战;通过研究数模混合电路故障仿真和信号处理等关键技术,实现了具有标准文件数量、内容和格式的故障字典自动生成功能;故障字典具有规范性和实用性等特点,可有效解决当前模拟和数模电路故障诊断存在的问题,提高故障诊断效率;试验验证表明,文中所述技术具有很好的实用与推广价值。     

数模混合电路仿真波形的自动比较

针对快闪存储器设计中的数模混合信号的特征,提出一种波形自动比较的方法来解决数模混合电路流片前的自动验证.采用点到点比较实现数字信号的完整性检查和模拟信号波形的自动比较;采用时间偏移匹配比较实现指令的自动检测和偏移时间的自动匹配,并对指令驱动的模拟信号进行自动比较;采用图像模式匹配比较对不同工艺条件、电源电压和温度条件下的仿真波形进行自动比较.该方法用程序实现并将其应用于英特尔技术开发(上海)有限公司快闪存储器上海事业部的设计流程中,减少了流片前验证的疏忽遗漏,提高了工作效率.     

基于CPLD的同步测速发电机信号测量设计

通过分析永磁同步测速发电机的特点和CPLD的功能,提出了基于CPLD来采集同步测速发电机转速信号的数模混合新方法;研究了测速发电机输出信号的模拟和数字两种滤波和电机转向的判断以及正反转信号的处理等,采用了信号延迟采样的滤波方法和双时钟的计数方法;给出了相关硬件设计和程序设计框图并仿真验证了软件,实验证明该测速方法具有精度高、抗干扰能力强及可靠性高的优点。     

一种特高压交直流电网数模混合实时仿真系统

本文设计了一种特高压交直流电网数模混合实时仿真系统,其操作系统采用Linux,仿真软件采用Hypersim,借助信号接口以及功率接口完成了仿真程序和物理装置之间的有效互联,同时借助SGI超级计算机,最终出色完成了实时仿真试验工作。该仿真系统已经服务于若干个实际工程。实践及本试验表明,对特高压交直流大电网的运行进行研究时,数模混合实时仿真系统能够以其强大且全面的功能为其提供良好的技术支持。     

模拟信号的恢复及其误差研究

数模混合仿真中模拟信号的恢复及其误差对整个仿真过程具有重要影响。本文探讨了用零阶保持和一阶保持进行信号恢复的方法，比较了它们的误差及工作特点。特别指出了一阶保持中，由于存在积分器复原时间及数字机操作时间的影响而会带来附加的误差，因此一阶保持方法较难达到其理论的精度。     

边界扫描在数模混合电路板级测试中的设计与应用

针对飞控系统某数模混合电路板测试需求,在不利用外部信号源、信号采集设备的条件下,利用边界扫描技术进行测试系统设计。介绍了PCI-410边界扫描核心套件和ScanWorks测试软件,对边界扫描测试方法进行研究,详细说明了测试系统方案设计、测试流程开发步骤以及测试程序执行方式,并通过实际测试,验证了设计的可行性,为数字电路板和简单的数模混合电路板的测试提供了实用的测试方法和手段,具有很好的应用价值。     

一种从数模混合信号中提取数字信号的时域算法

介绍了一种基于信号幅度特征的时域提取算法,可以准确地从数模混合信号中提取数字信号.此算法的实现简单,不需要太高的处理速度就可实现实时处理,可应用在数模混合信道的数字解码器中,实现数模混合信道的数字通信.     

布帛在礼品包装设计中的造型和应用方法探析

在礼品包装设计中,不同的礼品,包装造型方法和装潢形式各异,本文提出使用传统的布帛包装材料,结合新的设计理念和工艺技术进行创作,总结出三种较典型的布帛包装造型和应用方法。本文还探寻了在具体设计中,灵活融入布帛工艺和文化内涵、结合其他装饰元素,用传统而又时尚的手法,创造出具有复用价值和文化气息的礼品包装设计。     

A function combined baby stroller design method developed by fusing Kano,QFD and FAST methodologies

This paper proposes a user requirements-oriented baby stroller design method centered on finding the best combination of functions. First, user requirements are gathered, analyzed using KJ method for hierarchical analysis and clustered according to the Kano model, and the importance of each group is determined. Then, the function of the baby stroller body is decomposed using FAST method to obtain the function structure. Finally, the function structure of the baby stroller is imported into the “requirement-function” of the quality house model to establish the correlation between user requirements and stroller functions, and a function system diagram is created. The outcome of our experimental design study shows that the proposed function-combining design method allows the designer to effectively grasp real user requirements and design a stroller using a streamlined design process, thus resulting in better designs that meet user expectations.Relevance to industryThe proposed function-combining design method allows the designer to effectively grasp real user requirements and design a stroller using a streamlined design process.     

Inverse system design for LPV systems using parameter-dependent Lyapunov functions

This paper addresses the design problem of gain-scheduled inverse systems (GSISs) for linear parameter-varying (LPV) systems, whose state-space matrices are represented as parametrically affine matrices, using parameter-dependent Lyapunov functions (PDLFs), and proposes a method for them via parametrically affine linear matrix inequalities (LMIs). Our method includes robust inverse system (RIS) design as a special case. For RIS design, our method theoretically encompasses the method using constant Lyapunov functions. A design example is included to illustrate our conclusions.     

A CAD-based design parameterization for shape optimization of elastic solids

In this paper a CAD-based design sensitivity analysis (DSA) and optimization method using Pro/ENGINEER for shape design of structural components is presented. The CAD-based design model is critically important for multidisciplinary shape design optimization. Only when each discipline can compute the design sensitivity coefficients of the CAD-based design model, can a true multidisciplinary what-if study, trade-off analysis, and design optimization be carried out. The proposed method will allow the design engineer to compute design sensitivity coefficients of structural performance measures such. as stress and displacement, evaluated using existing finite element analysis (FEA) tools, both h- and p-versions, with respect to design variables defined in the parameterized CAD model. The proposed method consists of (i) a CAD-based design parameterization technique that ties the structural DSA and optimization to a CAD tool; (ii) a design velocity field computation that defines material point movement due to design change in CAD geometry, satisfies linearity and regularity requirements, and supports both hand p-version FEA meshed using existing mesh generators; and (iii) a design optimization method that supports structural geometric and finite element model updates in Pro/ENGINEER during the optimization process.     

Design candidate identification using neural network-based fuzzy reasoning

Conceptual design has profound impact on success of a product design. Identification of the best conceptual design candidate is a crucial step as design information is not complete and design knowledge is minimal at conceptual design stage. This paper presents a method for design candidate evaluation and identification using neural network-based fuzzy reasoning. The method consists of the following steps: (1) acquisition of customer needs and ranking of their importance, (2) establishment of measurable metrics and their relations with customer needs, (3) development of design specifications and initial evaluation of design candidates, and (4) evaluation and identification of design candidates based on design specifications and customer needs using neural network-based fuzzy reasoning. A case study is given to show the effectiveness of the proposed method and associated algorithms.     

基于数据库技术的模具参数化设计

结合实例详细介绍了在AutoCAD2000环境下。利用内嵌的面向对象编程语言VBA认作为开发工具。以变量驱动图形的参数化设计的过程和方法。同时还介绍了运用数据库技术进行参数化设计的方法。     

A study of solution algorithms for shape design sensitivity analysis on a supermini computer with an attached array processor

This paper presents a study and comparison of shape design sensitivity analysis algorithms that are based on the continuum adjoint variable method, the continuum direct differentiation method, and the finite difference method, implemented on a supermini computer with an attached array processor. The basic algorithms and their differences in evaluating shape design sensitivity coefficients are outlined. A solution method for solving a system of equations, using a general sparse storage technique, is used for numerical implementation of shape design sensitivity analysis. It is found that computing shape design sensitivity coefficients using the direct differentiation method is significantly more efficient than using the adjoint variable method or the finite difference method. A detailed performance evaluation of the methods, using an attached array processor, is presented. The performance of the attached array processor, compared to a supermini computer is shown to depend strongly on the type of computations to be carried out. When only parts of a program are running on an attached array processor, the CPU time distribution among the different subroutines of the program can change significantly, compared to using the host processor only.     

单级低压涡轮气动设计方法研究

研究一套单级轴流式涡轮气动设计仿真程序。在通流设计阶段,融入了先进的可控涡和可变涡轮功设计思想,有着AMDC、Soderberg、Carter三种模型可供选择。仿真程序采用一种新的涡轮平面叶栅反设计方法,相比传统反设计算法,更加简单实用;在原有理论基础上,引入非均匀有理B样条曲线,改进了前、后倒圆生成方法,消除了低能阻塞区;为验证设计程序,给出了单级涡轮设计实例进行仿真,结果表明程序稳定,可以实现涡轮叶片设计,叶片通道收敛效果良好。     

An inverse analysis method for design optimization with both statistical and fuzzy uncertainties

If the statistical data for the input uncertainties are sufficient to construct the distribution function, the input uncertainties can be treated as random variables to use the reliability-based design optimization (RBDO) method; otherwise, the input uncertainties can be treated as fuzzy variables to use the possibility-based design optimization (PBDO) method. However, many structural design problems include both input uncertainties with sufficient and insufficient data. This paper proposes a new mixed-variable design optimization (MVDO) method using the performance measure approach (PMA) for such design problems. For the inverse analysis, this paper proposes a new most probable/possible point (MPPP) search method called maximal failure search (MFS), which is an integration of the enhanced hybrid mean value method (HMV+) and maximal possibility search (MPS) method. This paper also improves the HMV+ method using an angle-based interpolation. Mathematical and physical examples are used to demonstrate the proposed inverse analysis method and MVDO method.