产品设计的相似性模型

首先分析了产品设计过程，将其分为原理设计、结构设计和工艺设计3个阶段。产品的相似性体现在产品原理的相似性、结构的相似性、工艺设计的相似性与设计手段的相似性，在此基础上提出了产品设计的相似性模型，用相似性分析可以丰富产品设计的方法，缩短产品设计周期，拓宽产品设计的思路。     

面向设计的级进模结构装配模型及系统开发

针对级进模结构装配复杂的特点,采用框架/规则复合的知识表示方法来表达模具零(构)件;采用约束关系树和层次模型相结合的策略,建立了基于层次结构的约束装配模型;通过组件概念的引入,准确表达了装配设计模型中的多层次关系,从而建立了基于知识支持的自顶向下的级进模结构装配设计方法.通过VB6.0开发工具,结合Access数据库,基于SolidEdge图形平台二次开发平台,开发了面向设计的级进模结构装配模型设计系统.     

产品设计域数字孪生模型演化过程及方法研究

针对机电产品普遍存在的动态需求适应性差、设计阶段离散、设计周期长等问题，在设计理论与方法论创新的基础上，应用数字孪生技术对机电产品设计阶段进行研究，提出由需求分析、概念模型演化、结构模型演化、参数模型演化、孪生模型验证组成的机电产品设计域数字孪生演化方法，在以上3个演化中分别对相关模型使用了设计-评价-反馈-迭代的优化方法。以曳引式电梯为例，在孪生模型验证过程中,使用电梯的振动数据进行对比与迭代，完成并验证了机电产品设计域数字孪生演化方法的可行性。     

基于ACIS的金刚石砂轮模型设计

本文研究了特殊造型的金刚石砂轮基体的设计方法。首先介绍了ACIS的类结构，利用ACIS提供的三维实体引擎，将ACIS提供的底层类进行继承和封装。然后以螺旋外形金刚石砂轮为例，利用C 语言和API函数进行其基体的造型设计。采用该方法可以灵活方便地设计较为复杂的三维模型。采用数据交换技术，直接提取和转换以上设计的模型数据，再通过CAD／CAM则可以实现金刚石砂轮的自动化加工、整形和焊接等。     

液压泵工程数据库模型研究

本文讨论了液压泵工程数据库的结构特点，建立了液压泵工程数据库的概念模型和逻辑模型，提出了适合于领域的工程数据库的建模方法。     

基于QFD、TRIZ和三次设计的集成化设计方法研究

分析了现行产品设计中存在的问题，提出用QFD，TRIZ和三次设计之间的集成来解决这些问题，分别介绍了这三种设计方法，建立了三者集成的模型。并讨论了三者在产品开发过程中的作用和地位。     

面向TOP—DOWN设计的模具装配模型研究

针对传统的装配模型无法支持ＴＯＰ－ＤＯＷＮ设计流程，以及装配模型在模具结构设计中的关键作用，提出了一种面向ＴＯＰ－ＤＯＷＮ设计流程的模具装置模型，为了使提出的模型尽可能与ＩＳＯ／ＳＴＥＰ一致，符合国际化标准趋势，采秀Ｅｘｐｒｅｓｓ－Ｇ作为此模型的描述工具，基于此模具装配模型，用一例子讨论了实现ＴＯＰ－ＤＯＷＮ设计和并行设计的方法与过程。     

正态与对数正态应力—强度模型下求取可靠度的计算机辅助图解法

可靠度是概率设计的一项定量可靠性指标，本文介绍了一种根据正态与对数正态应力—强度模型求取可靠度值的计算机辅助图解法。通过高级语言与数据库的数据传递，编写与ＡｕｔｏＣＡＤ的接口程序。在ＡｕｔｏＣＡＤ工作环境下，借助Ａｕｔｏｌｉｓｐ功能，实现了图形的自动生成及未知图解参数的自动求解。该方法对机械构件的可靠性设计的全过程ＣＡＤ化，具有一定的应用价值。     

CMM离线检测在逆向设计模型改进中的应用

目前逆向工程主要采用逆向设计软件和CAD系统（如Geomagic，UG等）对点云进行拟合，并以此来评估几何型面拟合误差，而对设计模型的配合型面位置约束检测方法的研究则相对缺乏。为了在设计早期就能提前发现逆向设计模型的缺陷并进行改进，提出用精密三坐标测量软件离线检测逆向设计模型配合型面间空间约束的方法，讨论了逆向设计B-Rep模型的几何封闭性问题和制造工艺性（特别是装配要求）问题场景，给出装配约束型面间位置约束检测与缺陷改进的方法，最后用实例进行了说明，为现有的逆向设计模型质量检验和改进方法提供了一种有益补充。     

一种铸造工艺设计新方法

通过CAE软件与自主构建的数据库有效集成,完成了风电轮毂铸造成形工艺设计,构建了大型复杂铸件成形工艺设计新方法.工艺设计是以数据库为基础,以CAE热分析软件为平台,逐步完成工艺的加载,最终设计出该产品的成型工艺.新的工艺方法是以科学的方法解决了新产品材料成型难题,同时颠覆了以往CAE软件用来校验已设计工艺的优劣或优化工艺的思路,创建了与数据库集成的CAE独立设计材料成形工艺的新模式.     

基于三维实体设计下的FMC全型面加工

介绍了通过建立参数化三维实体标准件库及模架,提高了模具三维实体设计效率,促进了FMC实型全型面加工的全面实施,为模具行业设计、开发提供方便、有效的途径,同时,大大提高了铸件的精度,缩短了模具制造周期。     

基于关系模型的电火花加工工艺数据库的研究

运用关系型数据库模型，构建了基于Linux操作系统下的电火花加工工艺数据库系统，运用MySQL Server对数据进行组织、管理，实现了用简单的查询代替复杂的推理过程。有效地解决了电火花加工中工艺参数的选择问题，在工艺数据库开发方面具有良好的发展前景。     

基于RBF神经网络的电火花线切割加工工艺建模方法研究

根据电火花线切割加工过程的复杂性和随机性，在样本数据的基础上采用径向基函数(RBF)神经网络建立，实现在指定加工条件下的工艺效果预测，并进一步建立电火花线切割加工的优化模型和工艺效果仿真系统。     

板坯连铸动态轻压下工艺模型论述

板坯连铸动态轻压下工艺模型是保证连铸机在生产过程中能够正常实施轻压下的前提条件,与设计和生产操作直接相关.本文就工艺模型进行了综合论述,内容涉及到连铸机运转模式,扇形段控制方式,辊缝理论零点标定,轻压下总量设定,连铸机的负荷与参数设定,拉坯力(拉坯阻力)的监测,扇形段夹紧液压缸夹紧力及压下速度的设定,所浇钢种的高温物性参数数据库等.     

二十辊轧机轧制力动态预设定模型研究

针对某厂二十辊森吉米尔轧机生产不锈钢时存在非稳态过程轧制力设定偏差较大,带钢厚度超差段较长的问题,建立了摩擦因数数据库,采用迭代反算方式计算摩擦因数并存于数据库,在轧制力计算时提供摩擦因数;然后在机组原有ALSTOM轧制模型及Bland-ford公式的基础上,考虑了弹性区和温度变化的影响,建立了轧制力动态预设定模型,可在AGC投入前进行动态计算,时间间隔为1.5s;设定结果与实测数据比较表明,相对误差基本在±3%以内,厚度偏差2%以上的长度控制在5m以内,实现了森吉米尔轧机生产不锈钢时轧制力的精确设定。     

改进的Malkmus带模式晴空大气透射率计算方法(英文)

Malkmus带模式在气候研究以及遥感应用中具有较高的应用价值,然而其计算精度不高。针对该问题,引入修正量对Malkmus模型进行改进。实验采用HITRAN2008谱线数据和美国空军地球物理实验室(AFGL)提供的6种大气模式计算垂直路径大气分子的透射率数据。在不同的大气模式下,以MODTRAN计算结果为参考标准,利用最小二乘拟合得到修正量并将其用于大气透射率补偿。相对于传统Malkmus模型,改进模型的透射率精度提高了1~2个数量级。结果表明,本方法不仅能有效地提高模型计算精度,而且适用于不同的大气模式和大气分子。     

Connected word recognition using a cascaded neuro-computational model

We propose a novel framework for processing a continuous speech stream that contains a varying number of words, as well as non-speech periods. Speech samples are segmented into word-tokens and non-speech periods. An augmented version of an earlier-proposed, cascaded neuro-computational model is used for recognising individual words within the stream. Simulation studies using both a multi-speaker-dependent and speaker-independent digit string database show that the proposed method yields a recognition performance comparable to that obtained by a benchmark approach using hidden Markov models with embedded training.     

Functional model for the development of an inspection integration framework

Product dimensional inspection is set as one of the essential parts of the production process, where not only product quality test is checked but also its interaction with other development stages in a minimal time. This enables a feedback to make quicker production and design decisions, provides updated information about the inspection processes to be shared and used in the new development processes, and permits the simultaneous work in the preparation of the inspection processes themselves. For this aim, it is necessary, as it occurs in the STEP framework, to develop an application context that includes all dimensional inspection aspects, from the geometrical and measurement aspects to those related to administration and configuration product data. This paper proposes a solution to integrate the dimensional inspection process with coordinate measuring machines with the design and manufacturing processes. Integration is achieved through a common product information model. A functional information model, a reference information model and an interpreted information model have been defined. The interaction with other information models associated to other activities of the production cycle is possible. Tests have been made of the possibility of making the inspection information interchange at the operation level instead of making it at the CMM trajectory level, as it is the case of the current DMIS format. This level of information definition is easier to put into effect, easier to interpret, and it is more productive.

In order to test the validity of the information model, a real work environment which has been called IFCIA (Inspection Framework for Concurrent Information Access) has been developed. The IFCIA architecture is composed of a product modelling system, an object-oriented central database and a tri-dimensional coordinate measuring machine. The model has been implemented on an object-oriented product central database which is accessible by all the applications, so that the access to data is achieved in a concurrent way and in real time for the different agents involved in the development cycle, in a heterogeneous framework of platforms and applications. The generation and transference of the information among these systems are carried out exclusively according to data structures defined in the information model.     

A phase-field model coupled with a thermodynamic database

A phase-field model for the solidification of multi-component alloys, capable of being integrated with thermodynamic databases, has been developed. The solid–liquid interface is modelled as a mixture of solid and liquid phases. The solute concentration of the solid phase depends only on the local temperature while the solute concentration of the liquid phase is affected by solute rejection (or absorption) from the solid being formed together with the extent of any chemical diffusion in the liquid. The governing equations for the phase-field model have been derived in a thermodynamically consistent way such that the parameters in these equations are fully determined. By linking directly with the thermodynamic database MTDATA, the model is capable of simulating the microstructural evolution of real alloys. Numerical calculations for aluminium–silicon alloys show that the phase-field driving force changes in a similar manner to the thermodynamic driving force, although the phase-field driving force changes more quickly than the thermodynamic driving force when the system approaches equilibrium. The phase-field mobility is shown not to be a trivial function of constitutional undercooling. With the new phase-field model, the width of the liquid–solid interface region is allowed a much large value with the continuity of all parameters in the phase-field model and properties of interface maintained, and hence the model is suitable for simulating large-scale systems.     

A predicted milling force model for high-speed end milling operation

In this study, a predicted milling force model for the end milling operation is proposed. The speed of spindle rotation, feed per tooth, and axial and radial depth of cut are considered as the affecting factors. An orthogonal rotatable central composite design and the response surface methodology are used to construct this model. The milling force per spindle revolution period obtained from each treatment is equally divided into suitable sections. The extreme value of the milling force in each section is selected to build the predicted model so as to predict the extreme force in each section for any cutting conditions within the specified range of the design database, including the speed of spindle rotation, feed per tooth, and axial and radial depth of cut. Moreover, the predicted extreme force in each section is applied to reconstruct the milling force waveform by means of the expansion of the Fourier series. The predicted model presented in this paper is adequate for a 95% confidence interval, and shows good correlation between experimental and predicted results.