可靠度分配的模糊综合评判法

本文提出可靠度分配的模糊综合评判法。用此法研究串联、并联系统的可靠度分配。     

一种基于模糊综合评判的设计方法

提出了一种新的公差分配方法。首先利用模糊综合评判的方法确定特定制造环境下装配体中各零件公差的加工难易程度ζ,然后结合零件公差对装配功能要求的敏感度因子ξ,建立了公差分配的数学模型,最后利用遗传算法求解最优的公差值。     

用二级模糊综合评判成本加权系数法反求装配零件的尺寸公差

本文提出了一种确定反求装配零件尺寸公差的二级模糊综合评判成本加权系数法。这种方法,先找出影响成本权系数的主要因素,再把各个因素分解为影响它们的若干子因素,按其性质细分为若干等级,并按各个等级进行一级模糊综合评判,按所有子因素进行二级评判,取得各子因素合理的成本权系数,然后求得各因素的成本权系数。文中给出了用这种方法反求装配零件尺寸公差的步骤与具体实例。这种方法,采用编制的通用微机程序,计算简便,分析问题灵活,便于生产的实际应用。     

机床夹具公差的模糊优化设计

应用模糊数学理论，建立模糊综合评判模型，对影响夹具公差选择的诸多因素进行了数据处理，为定量确定平具公差提供了有效方法。     

基于模糊综合评判法的齿轮齿形加工方案设计

运用模糊综合评判法,建立起齿轮齿形加工方案的模糊综合评判体系,并用此方法对煤矿SGW-620/44A型刮板输送机减速器直齿圆柱齿轮的四种加工工艺方案进行评价,从而找出最佳齿形加工方案.     

绿色制造风险的群层次模糊综合评判

分析了绿色制造中综合风险的层次结构模型；建立了群层次模糊综合评判的数学模型：建立了综合风险层次模型，给出了群层次模糊综合评判的方法。实例研究表明，该方法是有效的，层次模型和群层次模糊综合评判反映了实施绿色制造中的风险特点，实际应用是可行的。     

基于模糊积分的绿色工艺规划综合评判

实施绿色制造的基础是确定绿色工艺规律。文中运用模糊积分建立了绿色工艺规划综合评判模型,采用两级评判方法解决了工艺规划中多影响因素的评判及工艺规划方案选择问题,并以实例说明了其可行性。     

模糊综合评判及计算机软件

本文分析了模糊综合评判与现代设计法的关系,论述了建立机械设计评判论域体系的方法,步骤及一些问题。介绍了笔者编制的计算机软件原理,并给出了实例。     

技改项目可行性评审的模糊综合评判

本文应用模糊数学方法对技术改造项目可行性进行综合评判，从而得到合理的评审结果。     

可加工陶瓷材料可加工性的模糊综合评判

以陶瓷材料的物理、力学性能为依据,应用模糊数学中的模糊综合评判原理,建立了陶瓷材料可加工性的模糊综合评判模型,提出了一种对陶瓷材料可加工性进行综合评判的新方法。根据提出的评判方法,对几种可加工陶瓷材料的可加工性进行评价,结果表明,该方法是可行的,而且易于运用计算机来处理,具有较高的效率和准确性。     

机械零件加工工艺规程的模糊评判

采用 1— 9比率标度法构造判断比率矩阵 ,通过特征向量求解功能模糊向量 ,并进行思维一致性检查 ,根据各模糊子集的贴近度进行模糊决策 ,确定零件最佳的工艺规程。     

Concurrent multi-objective tolerance allocation of mechanical assemblies considering alternative manufacturing process selection

Concurrent design of tolerances by considering both the manufacturing cost and quality loss of each component by alternate processes of the assemblies may ensure the manufacturability, reduce the manufacturing costs, decrease the number of fraction nonconforming (or defective rate), and shorten the production lead time. Most of the current tolerance design research does not consider the quality loss. In this paper, a novel multi-objective optimization method is proposed to enhance the operations of the non-traditional algorithms (Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II) and Multi-Objective Particle Swarm Optimization (MOPSO)) and systematically distribute the tolerances among various the components of mechanical assemblies. The problem has a multi-criterion character in which three objective functions, one constraint, and three variables are considered. The average fitness factor method and normalized weighted objective function method are used to select the best optimal solution from Pareto-optimal fronts. Two multi-objective performance measures namely solution spread measure and ratio of non-dominated individuals are used to evaluate the strength of Pareto-optimal fronts. Two more multi-objective performance measures namely optimizer overhead and algorithm effort are used to find the computational effort of NSGA-II and MOPSO algorithms. The Pareto-optimal fronts and results obtained from various techniques are compared and analysed. Both NSGA-II and MOPSO algorithms are best for this problem.     

绿色制造中机床设备选择的模糊评价

绿色制造已成为最近几年先进制造技术领域的研究热点之一。通过机床设备绿色决策的评价体系和数学模型的建立,采用二级模糊综合评价对模型求解,解决了机床设备的绿色配置问题。     

网络制造环境下面向复杂零件的协同制造链研究

为了实现网络制造环境下制造资源的共享与优化配置，提出了面向复杂零件的协同制造链的概念，分析了协同制造链的特点。通过对某航空发动机关键零件制造过程的分析，详细论述了协同制造链的生成与演化过程，提出了一种基于蚂蚁算法的组合优化求解策略，有效地解决了协同制造链优化配置问题。最后，基于网络协同制造平台实现了协同制造链的构建与运行。     

模糊优化最优水平值的灰色模糊综合评判

在求解模糊优化问题的最优水平截集法中,最优水平值λ的确定是整个问题的关键,本文综合了模糊评判和类色评判的优点,全面考虑影响λ取值的灰色因素和模糊因素,提出了基于层次分析的最优水平值灰色模糊综合评判方法,进而更加圆满地解决模糊优化问题。     

Economics of additive manufacturing for end-usable metal parts

Additive manufacturing (AM) of metal parts combined with part redesign has a positive repercussion on cost saving. In fact, a remarkable cost reduction can be obtained if the component shape is modified to exploit AM potentialities. This paper deals with the evaluation of the production volume for which AM techniques result competitive with respect to conventional processes for the production of end-usable metal parts. For this purpose, a comparison between two different technologies for metal part fabrication, the traditional high-pressure die-casting and the direct metal laser sintering additive technique, is done with consideration of both the geometric possibilities of AM and the economic point of view. A design for additive manufacturing approach is adopted. Costs models of both processes are identified and then applied to an aeronautical component selected as case study. This research evidences that currently additive techniques can be economically convenient and competitive to traditional processes for small to medium batch production of metal parts.     

Design for automating the inspection of manufacturing parts

The integration of quality into management of advanced manufacturing systems has not typically included automated approaches. With the advent of automated inspection and quality tools such as coordinate measuring machines and other dimensional measuring equipment, the linkage with integrated manufacturing systems seems natural. This paper shows the functional relationship of computer aided process planning to automated inspection process planning. The series of functional activities within each of these frameworks are mapped in this paper. The operational environment to include computer aided quality control in an integrated manufacturing system is also defined.     

集团制造多主体外协订单任务制造资源配置

集团制造企业的外协订单任务制造资源配置过程具有多主体、多任务、多资源、多工序以及协同性的特点,增加了订单制造资源配置过程的复杂性和不确定性。针对这一问题,提出两阶段多主体外协订单任务制造资源配置方法;设计了基于成本—工期—收益的订单任务排序算法和基于PageRank的订单任务制造资源排序算法,并建立了多主体外协订单任务制造资源配置模型;运用遗传算法求解多目标下多主体外协订单任务制造资源配置模型的Pareto最优解。以某建材装备制造集团的外协订单任务制造资源配置为例,验证了所提理论方法的合理性和有效性。     

复杂零件网络协同制造平台研究

为了实现网络制造环境下制造资源共享与优化配置，提出了面向复杂零件的协同制造链的概念，分析了协同制造链的组织与运行模式；创建了一个基于语义Web的网络协同制造平台，对其主要功能、体系结构、工作流程进行了研究，指出网络协同制造平台在协同制造链构建与运行过程中居于核心地位。     

Roundness modeling of machined parts for tolerance analysis

Out-of-roundness of circular and cylindrical parts can greatly affect assembly accuracy. At present, the ASME Y14.5M-1994 specifies circularity tolerance based on two extreme circular boundaries to confine the highest peak and the lowest valley of a roundness profile; however, the profile variations within the two extreme boundaries are not accounted for. In this paper, we propose a harmonic roundness model using Fourier series expansion. In addition, a cutting profile model has been developed to illustrate the relationship between the radial error motion of a spindle and the resultant part profile. This relationship is then used to provide physical meanings to the harmonics generated by the proposed roundness model for a part profile, in particular those caused by fractional frequency spindle error motions. The proposed harmonic model has been verified statistically by a large number of real profiles produced by both turning and cylindrical grinding processes. The proposed roundness model is expected to provide insights into the advanced tolerance analysis of circular and cylindrical parts.