高速卷绕头关重件建模及其工作过程仿真

高速卷绕头是化纤长丝纺丝设备单元机,其运动机构组成和工作性能直接影响着高速纺丝质量和技术本身。运用虚拟样机技术,通过实体建模软件Solidworks和系统动力学仿真分析软件ADAMS建立了包括兔子头、锭轴及压丝辊等关重件的运动学、动力学分析模型,对其动态特性进行了仿真计算和曲线分析。这不仅为机电一体化系统整机模型的建立打下了基础,同时,为实际物理样机关键部件的结构设计和参数优化设计提供了依据。

Abstract：

The high speed winder is an important spinning equipment, whose assemblies and their performances influence the spinning property and the spinning technology itself. The kinematics and dynamic model of its key parts were built in Solidworks, and based those models, the motion processes were simulated in ADAMS using virtual prototype technology. The kinematic curves of rabbit head, spindle and surface roller were obtained and analyzed. These play a foundation for the whole system simulation based on mechanical-electronic model, and provide evidences for the structure parameter optimization design of the physical equipment.     

基于虚拟集成技术的ESP硬件在环仿真

针对汽车电子稳定性控制系统的开发,提出了集成ADAMS/Car的整车虚拟样机、MATLAB/Simulink的虚拟控制器和LabVIEW的测控平台的汽车电子稳定性控制的硬件在环仿真方法（VCHIL）,阐述了该方法的实现原理,讨论了基于虚拟集成技术的硬件在环仿真系统的组成及其相互关系,并以此为向导,研制了汽车电子稳定程序（ESP）的硬件在环仿真实验平台,并进行了实验验证。

Abstract：

Aiming at the development of ESP system,hardware-in-loop simulation method based on virtual cross technology （VCHIL）,which combined virtual modal by ADAMS/CAR,virtual controller by MATLAB/Simulink and LabVIEW platform,was addressed.The realization principle of the method was introduced.The structure and relation between parts of hardware-in-loop simulation system based on virtual cross technology were discussed,and according to these,the hardware-in-loop simulation testing platform was developed.Test on this platform was performed and the results were analyzed and compared.     

Design and application of single-antenna GPS/accelerometers attitude determination system

In view of the problem that the current single-antenna GPS attitude determination system can only determine the body attitude when the sideslip angle is zero and the multiantenna GPS/SINS integrated navigation system is of large volume, high cost, and complex structure, this approach is presented to determine the attitude based on vector space with single-antenna GPS and accelerometers in the micro inertial measurement unit （MIMU）. It can provide real-time and accurate attitude information. Subsequently, the single-antenna GPS/SINS integrated navigation system is designed based on the combination of position, velocity, and attitude. Finally the semi- physical simulations of single-antenna GPS attitude determination system and single-antenna GPS/SINS integrated navigation system are carried out. The simulation results, based on measured data, show that the single-antenna GPS/SINS system can provide more accurate navigation information compared to the GPS/SINS system, based on the combination of position and velocity. Furthermore, the single-antenna GPS/SINS system is characteristic of lower cost and simpler structure. It provides the basis for the application of a single-antenna GPS/SINS integrated navigation system in a micro aerial vehicle （MAV）.     

采摘机械手虚拟设计与仿真系统的研究

在产品虚拟设计与仿真系统的开发中,为了实现智能设计,虚拟设计与企业产品设计的协同性、同一性和可重用性,实体建模属性的统一规范和标准定义十分必要。第一,首次提出和制定了可以用于虚拟产品建模与仿真的命名规则标准,为虚拟机械产品的设计提供参考。第二,构建水果采摘机械手虚拟设计与仿真系统的体系结构,建立了机械手机构设计模块,它包括机构的参数化设计和知识重用;第三,构建了机械手设计知识库和三维仿真模块;第四,已知机械手视觉获取目标的三维坐标,用软件实现反求机械手运动及其算法,并实现虚拟环境下的机械手对目标定位和采摘的三维仿真;第五,开发了水果采摘机械手虚拟设计与仿真系统。最后,通过三维仿真和实验样机对关键技术进行了验证。

Abstract：

In the development of product virtual design and simulation system, in order to achieve the cooperativity, identity and reusability of intelligent design, virtual design and enterprise product design, the unified standard and standard definition about solid modeling properties were necessary. First, the virtual product naming standards used for modeling and simulation as a reference for the virtual mechanical product design were firstly proposed. Second, the structure of the fruit picking manipulator virtual design and simulation system was constructed, and a manipulator mechanism design module was developed, including the parametric design and knowledge reuse. Third, the knowledge base and 3-D simulation module were constructed. Fourth, through the known 3-D coordinates of objects obtained by manipulator visual, the inverse about manipulator movement and algorithm were realized by software, and the 3-D simulation about the object positioning and picking was realized in virtual environment. Fifth, the fruit picking manipulator virtual design and simulation system was developed. Finally, 3-D simulation and experimental prototype were used to validate the critical technologies.     

Product Family Hierarchical Associated Design and Its Hierarchical Optimization

After reviewing the literature and methodology-related issues within the field of product family design, a deficiency in the current design and development of product family is pointed out. The concept of hierarchical associated design is proposed in this article, according to the deficiency~ and the methods and models for realizing the notion above are described. A two-dimensional analytical model is constructed based on the composing levels and developing processes of product family. The optimization models to hierarchical associated design problems are grouped into two categories： overall-local and key-subordinate. The algorithms of the models are discussed in this paper     

A High Speed Detection Scheme for Point Targets in a Multitarget Environment

The purpose of this paper is to develop a high speed detection scheme for moving and / or stationary point targets in a multitarget environment as registered in an IR image sequence. An iterative approximate 3-D line searching algorithm based upon the geometric representation of lines (for non-maneuvering targets in space) in a 3-D space is derived. The convergency of the algorithm is proved. An analysis is performed of the theoretical detection performance of the algorithm. The statistical experiment results show high effectiveness and computational efficiency of the algorithm in the case of low SNR. The idea may be employed to satisfy the real-time processing requirement of an IR system.     

Generation method for five-axis NC spiral tool path based on parametric surface mapping

A new spiral tool path generation algorithm for 5-axis high speed machining is proposed in this paper. Firstly, the voltage contours are calculated to satisfy the machining parameters in the mapping parametric domain by means of the electrostatic field model of partial differential equations. Secondly, the mapping rules are constructed and the machining trajectory is planned out in the standard parametric domain in order to map and generate the spiral trajectory in the corresponding parametric domain. Finally, this trajectory is mapped onto the parametric surface for the obtainment of the spiral tool path. This spiral tool path can realize the machining of complicated parametric surface and trimmed surface without tool retractions. The above-mentioned algorithm has been implemented in several simulations and validated successfully through the actual machining of a complicated cavity. The results indicate that this method is superior to the existing machining methods to realize the high speed machining of the complicate-shaped cavity based on parametric surface and trimmed surface.     

Flow Control Strategy for the High Speed Network Based on Control Theory

Design of an effective congestion control scheme is a hot topic in the development of computer network. The flow control scheme can adjust the packet sending rate in source host, thus effectively avoiding the network congestion. This paper proposes a new flow control scheme based on discrete control theory. The simulation results show that this method can adjust the sending rate and queue level in buffer rapidly and effectively. The method is easy to implement and applicable to high speed networks.     

Evaluation matrix with the speed feature based on double inspiriting control lines

Methods of the comprehensive evaluation have been studied for many years. However, the change speed of evaluated objects was rarely considered by the existing evaluation methods. An evaluation matrix is proposed to remedy this deficiency. Firstly, the change speed state （CSS） of the evaluated objects is analyzed based on double inspiriting control lines （DICLs）, and a matrix of the CSS is constructed. Then, 72 elements in the matrix are analyzed, and formulas describing each CSS are given. The efficiency of the proposed evaluation matrix is proved when the CSS merges with the change speed trend （CST） in the dynamic comprehensive evaluation. Finally, a computing example shows that the proposed evaluation matrix is feasible in the dynamic comprehensive evaluation with the speed feature.     

FORECASTING AUTOMOBILE WARRANTY PERFORMANCE IN PRESENCE OF ‘MATURING DATA’ PHENOMENA USING MULTILAYER PERCEPTRON NEURAL NETWORK

1. Introduction An automobile with over 7000 parts is a highly complex product. In spite of employing the best quality and reliability practices during product development, manufacturing, and assembly, unexpected failures during warranty period do occur and cost automobile companies billions of dollars annually in warranty alone. Warranty cost reduction programs in these companies thus receive a high priority. Various teams work together to achieve objectively defined targets for warranty cost…     

基于组件的多体系统虚拟原型的分析模型研究

并行工程角度出发的机械虚拟原型是集成了产品的设计、分析，不断迭代、优化的过程，模型的协调一致性是保证设计过程完整的关键，如产品模型在CAD模型与机械多体动力学模型中的一致性表达。在这种观点下，提出在建立基于组件的机械系统虚拟原型时。从CAD中抽取多体动力学模型构件的物理属性，研究了国产三维实体设计软件CAXCA环境下，基于多刚体系统动力学笛卡尔方法，从CAD模型映射多刚体动力学分析模型语义的实现方案。分析了多刚体系统动力学模型语义下，万向节装配体的惯量张量、滑移铰约束模型坐标基变换关系的抽取，实验结果表明，从CAD中抽取多体动力学模型的物理属性的方案是可行的，可以用于建立基于组件的多体系统虚拟原型的分析模型，实现自主开发设计、分析集成的机械虚拟原型。     

基于HLA的一体化协同设计、仿真、优化平台

复杂产品的机理、功能、结构、开发过程复杂,协同设计、协同仿真、协同优化分别已经成为复杂产品开发的强有力的支撑技术.从复杂产品开发的需要出发,提出并研究了协同设计、仿真与优化的集成.介绍了基于HLA的一体化协同设计、仿真、优化平台的体系结构以及相关实现技术.最后介绍了基于该平台实现高速列车开发的实际应用.     

基于组件的分布式虚拟仿真平台的研究与实现

分布式环境下虚拟仿真技术是在虚拟的逼真环境下,对产品设计及其周边环境进行协同仿真验证的有效手段.本文首先提出了分布式虚拟仿真系统设计的一些概念和原理,接着提出了基于组件对象模型的虚拟仿真系统建模与仿真方法,并重点阐述了支持分布式虚拟仿真的集成框架及其关键实现技术,该平台在一具体的仿真实验系统—飞机模拟仿真飞行系统的的设计中得到具体应用。     

CAE工程及其与单片集成和混合集成电路的关系

本文针对当前关系一个企业竞争力和科研水平的CAE工程,结合雷达系统、部件、器件的应用,论述了声表面波器件CAD技术、集成电路中反应离子刻蚀(RIE)薄膜刻蚀深度的神经网络建模预测、混合集成电路(MCM)的并行工程设计和可靠性分析,最终构造了一个集成化的具有数据库、仿真器、实体建模、工具接口和统一的图形用户界面(GUI)的软件系统.     

面向高效能计算的虚拟化技术研究综述

首先介绍了未来高效能计算的需求来源—大型复杂CAE的研究现状,指出高效能计算作为大型复杂CAE问题求解的重要工具和实现途径,对工业制造领域产品创新的研究和设计水平的提高具有重要意义;其次,阐述了高效能计算的研究现状、存在问题和发展趋势,指出了在高效能计算中应用虚拟化技术的必要性;再次,对虚拟化技术及面向高效能计算的虚拟化技术的研究现状进行了分析,指出了虚拟化技术在面向大型复杂CAE的高效能计算、特别是在虚拟制造领域中的应用框架和应用前景。最后,提出了本领域研究的不足及未来的研究工作。     

基于仿真的虚拟产品设计若干关键要素研究

虚拟产品设计需要从管理、方法论、实现技术和数学工具层面同时展开研究。分析了基于仿真的虚拟产品设计应该实现的核心功能,提出“三核心四层次”的虚拟产品设计框架。总结了框架中建模技术、仿真技术、优化技术和集成技术等关键要素面临的挑战,并给出了对应的研究方法和目前取得的初步研究成果,主要包括:全息产品建模方法;基于仿真试验的统计回归与优化技术和稳健优化决策技术。最后指出了进一步研究的方向。     

飞行器的多学科分析与计算机仿真

综合运用计算机软件对飞行器进行结构设计和多学科仿真分析，用来预测飞行器的结构力学，热力学，空气动力学，飞行控制等诸方面的特性及其相互之间的关系，文中介绍了编制的有关人机界面，数据转换程序，以及飞行器建模和仿真过程，并通过对某超音速飞行器的仿真计算给出了建模和多学科仿真分析的实例，利用多学科计算机仿真分析可以对飞行器进行优化设计。     

微小型航天器寿命周期内的虚拟航天器技术

提出了一种基于虚拟航天器进行微小型航天器设计与研制的新手段和新模式.虚拟航天器是航天器多学科主要关键特性的集成化数学模型,利用虚拟航天器能够实现航天器设计方案优选,虚拟环模试验及在轨飞行任务仿真和评估等操作,为微小型航天器数字化设计与并行研制提供了必要的技术手段.总结分析了虚拟航天器设计与仿真的关键技术,并建立了虚拟航天器原型系统,对本文研究内容进行验证.创新性研究成果对于我国微小型航天器技术的进步和跨越式发展具有积极的推动作用.     

复杂产品虚拟样机协同仿真建模技术研究

复杂产品虚拟样机技术是复杂产品开发设计的重要技术之一。复杂产品虚拟样机建模和优化是用户需求和仿真支撑平台之间的关键环节,并且贯穿于设计、开发和测试的各个环节。主要讨论了对复杂产品虚拟样机设计分布式协同高层建模的四个方面:复杂产品虚拟样机开发过程中的建模规范;协同仿真平台中的高层建模技术;介绍了如何使用模型驱动体系结构(MDA)来快速开发复杂产品虚拟样机的概念原型, 如何实现基于Web Service的复杂产品虚拟样机的分布式协同建模。