Robust Design Rule with Definite Purpose Character Based on Fuzzy Probability and Study of its Characteristics

The design target with definite purpose character of product quality was described in a real fuzzy number(named fuzzy target for short in this paper),and its membership functions in common use were given.According to the fuzzy probability theory and the robust design principle,the robust design rule based on fuzzy probability(named fuzzy robust design rule for short)was put forward and its va-lidity and practicability were analyzed and tested with a design example.The theoretical analysis and the design examples make clear that,while the fuzzy robust design rule was used,the fine design effect can be obtained and the fuzzy robust design rule can be very suitable for the choice of the membership function of the fuzzy target;so it has a particular advantage.     

案例知识的产品造型设计方法研究

目的为设计出符合消费者感性需求的产品,适应大规模定制的生产模式,缩短产品开发周期并方便企业后期的产品迭代,提出了一种应用已有产品案例进行产品快速设计的方法。方法以对象设计知识分类理论为基础,融入了消费者感性意象这一特征,建立了案例造型知识库模型,并由此模型指导案例各特征知识的获取,由此建立案例造型知识库。结论依据设计需求,应用案例造型知识库进行案例的检索、匹配、推理、变异,完成对四阀饮料机的方案设计,验证方法的可行性与高效性。     

Promoting Consumption Safety Based on Design and Manufacturing——Guide for Manufacturing Safe Consumer Goods Is Being Formulated

High levels of specification,depth of levels,wide range,and high efficiency,were the four fea-tures of the China Standardization Forum held inXi'an,Shaanxi Province on April 6th.This Forum was an important part of the Yearof Quafity and Safety carried out by AQSIQ.It wasattended by Pu Changcheng,vice minister ofAQSIQ,Wu Dengchang,vice Governor of ShaanxiProvince,Zhou Weijian,vice-chairman of theShaanxi Province's Political Consultative Confer-ence,Zhang Jianwei,duty director of the Standard-ization Admi...     

A Study on Turbo—rotor Multi—fault Diagnosis Based on a Neural Network

The multi-fault phenomena are common in the turbo-rotor system of a liquid rocket engine.As it has many excellent qualities,the neural network might be used to solve the problems of multi-fault diagnasis of a turbo-rotor system.First,the feature expression of a common turbo-rotor fault was studied in order to build up the standard fault pattern and satisfy the need of neural network studying and diagnosing.Then.the turbo-rotor fault identification and diagnosis problems were investigated by using a BP(back-propaga-tion)neural network.According to the BP neural network problems,the parallel BP neural network method of multi-fault diagnosis and classification was presented and investigated.The results indicated that the parallel Bp neural network method could solve the turbo-rotor multi-fault diagnosis problems.     

A Novel Design and Fabrication of Magnetic Random Access Memory Based on Nano-ring-type Magnetic Tunnel Junctions

Nano-ring-type magnetic tunnel junctions （NR-MTJs） with the layer structure of Ta（5）/Ir22Mn78（10）/ Co75Fe25（2）/Ru（0.75）/CoooFe20B20（3）/Al（0.6）-oxide/Co60Fe20B20（2.5）/Ta（3）/Ru（5） （thickness unit： nm） were nano-fabricated on the Si（100）/SiO2 substrate using magnetron sputtering deposition combined with the optical lithography, electron beam lithography （EBL） and Ar ion-beam etching techniques. The smaller NR-MTJs with the inner- and outer-diameter of around 50 and 100 nm and also their corresponding NR-MTJ arrays were nano-patterned. The tunnelling magnetoresistance （TMR ＆ R） versus driving current （I） loops for a spin-polarized current switching were measured, and the TMR ratio of around 35% at room temperature were observed. The critical values of switching current for the free Co60Fe20B20 layer relative to the reference Co6oFe2oB2o layer between parallel and anti-parallel magnetization states were between 0.50 and 0.75 mA in such NR-MTJs. It is suggested that the applicable MRAM fabrication with the density and capacity higher than 256 Mbit/inch2 even 6 Gbite/inch2 are possible using both I NR-MTJ＋1 transistor structure and current switching mechanism based on based on our fabricated 4×4 MRAM demo devices.     

Study of Dissolution Behavior of Matrices Tablets Based on Alginate—Gelatin Mixtures as Prolonged Diltiazem Hydrochloride Release Systems

ABSTRACT

The aim of this work was to develop prolonged diltiazem hydrochloride release matrices based on alginate-gelatin mixtures and establish the drug release mechanism. The erosion, swelling, and dissolution behavior of the tablets in different medium were evaluated. The different polyelectrolyte behavior and gel strength between type A Gelatin and type B Gelatin would explain the different swelling, erosion and dissolution behavior in the media with sudden pH change. The similar dissolution behavior in the pH, which simulates the physiological pH through the gastrointestinal tract, should be explained because the same main species for gelatin A and Gelatin B would be present in this media.     

基于实例推理的航空产品机加工工装设计相似性研究

针对航空产品的零件结构特点,将实例推理应用于航空结构零件机械加工工装设计.提出考虑工件信息、工艺信息和装夹信息的工装设计信息表示方法,来表达设计任务信息和以往设计实例信息.将工装设计实例分解为各属性,并按照一定方法对属性间的相似度进行量化,计算实例间的相似度值.结合分层检索的相似性评价算法,得到与设计任务匹配程度高的实例方案,并通过实例修正,达到新设计任务的快速实现.     

采用实例推理的寄生式通用零部件设计系统的研究

提出了一种运用实例推理在SolidWorks 2005环境下开发通用零部件设计系统的方法.通用零部件设计系统是基于SolidWorks 2005最底层API函数,采用寄生式软件开发的方法,利用微软的 Microsoft Visual C 6.0作为开发语言,以提高企业产品开发生命周期的服务系统.阐述了通用零部件设计系统的体系结构和主要功能模块;给出了各模块的实现流程;说明了系统实现的关键技术;用设计实例进行了验证.     

创新式组合夹具结构设计自动化

在广义映射原理指导下,探讨了组合夹具创新设计自动化的潜力及主要的方法和途径,指出广义域分解的粒度空间是决定组合夹具创新设计潜力的关键因素。因此选择零件的夹持表面作为分析的基础,从提取夹具的需求信息出发,建立了组合夹具的功能要求集合,探讨了组合具功－构自动映射的方法,在对组合夹具概念结构实施多方案重构过程中,验证其创新潜力。     

建设工程施工合同争议案例知识管理研究

以建设工程施工合同争议案例分解为基础,提出了建设工程施工合同争议案例知识管理模型架构,分析了架构组成.本文将知识元理论和矩阵模型引入到合同争议中,并运用相似度实现案例检索.依据提出的架构及关键技术,承包商企业可实现施工合同争议案例的知识管理,从而提高知识资源的利用率,降低工程成本.     

案例推理技术在包装设计系统中的应用

鉴于包装设计的复杂性和不确定性,基于案例推理技术及其应用特点,将CBR技术应用到包装设计系统中,提出了一种以CBR为基础的包装设计系统的功能模型。详细探讨了系统的关键技术。对构造更加高效的包装设计系统有一定的实用价值。     

基于汽车售后服务本体模型的汽车服务案例式推理研究

将本体论理论方法应用于汽车售后服务领域,利用本体论构造客户驾驶行为本体、驾驶环境本体和汽车领域本体,并结合这三个本体之间的关联,构建汽车售后服务本体模型,从而厘清了影响汽车售后服务诸因素的内在关联.根据汽车售后服务本体模型提出驾驶行为相似度和驾驶环境相似度的度量方法,基于驾驶行为相似度、道路环境相似度和气候环境相似度,提出了案例相似度的计算方法.     

夹具CAD的相似性分析

依据夹具自身特征信息,以相似性理论为为基础,构造了夹具的相似信息模型．该信息模型提供了夹具概要设计和详细设计所需求的信息,并为夹具定量分析提供了相似分析算法,在该信息模型的基础上,建立了相似夹具零部件数据库,并设计了该数据库的管理程序．     

薄壁筒形件旋压工艺及工装设计

通过对薄壁筒形件加工工艺进行分析,介绍了旋压加工的工艺计算,旋压工艺参数的确定及工装设计,同时分析了生产中出现的问题,提出了解决措施,保证了该零件的顺利成形.