机械结构相似度评价及可靠性预计研究

发布时间：2018-05-17 19:09

本文选题：相似度评价 + 可靠性预计　；参考：《工程设计学报》2017年03期

【摘要】：在用传统的相似产品法进行可靠性预计时,所选取的相似产品与评价对象之间差异较大,会造成预计结果的偏差较大。为解决这一问题,提出了一种基于"功能—运动—动作"结构化分解的可靠性预计新方法。通过明确产品的各大运动功能建立功能层,分析完成各功能的机械部件运动建立运动层,确定实现各机械部件运动的元动作运动单元建立元动作层,建立了可靠性预计的"功能—运动—元动作运动单元"层次模型。引入区间层次分析法,确定了"功能—运动—元动作运动单元"层次模型中各子代运动单元对父代运动单元的可靠性影响权重,并构建了由子代运动单元预计父代运动单元可靠性的数学模型。确定影响评价机械结构相似度的因素,构建了区间数综合评判云模型并选取与元动作运动单元相似的参考结构,以区间数综合评价云模型得出的相似度值修正参考结构的可靠性数据来预计元动作运动单元的可靠性。将元动作运动单元的可靠性预计值代入数学模型,层层预计父代运动单元的可靠性,从而得出整个产品的可靠性水平。最后以数控转台为例进行了分析,得出了可靠性预计值,并将该方法与传统方法进行了比较。结果表明,新的可靠性预计方法具有较好的可行性和较高的准确性。
[Abstract]:When using the traditional similar product method to predict the reliability, the difference between the selected similar product and the evaluation object is great, which will result in a large deviation of the predicted result. In order to solve this problem, a new reliability prediction method based on structured decomposition of "function-motion-action" is proposed. By defining the functional layer of each major moving function of the product, analyzing the movement of each functional mechanical part to establish the motion layer, determining the meta-action unit to realize the movement of each mechanical component to establish the meta-action layer, A hierarchical model of function-motion-meta-motion unit for reliability prediction is established. By introducing the interval Analytic hierarchy process (AHP), the influence weight of each generation motion unit on the reliability of the parent motion unit in the "Function-Movement-Meta-Action Motion Unit" hierarchical model is determined. A mathematical model for predicting the reliability of parent kinematic units is constructed. The factors affecting the similarity of mechanical structures are determined, and the interval number comprehensive evaluation cloud model is constructed, and the reference structure similar to the meta-action motion unit is selected. The reliability of the meta-action motion unit is predicted by modifying the reliability data of the reference structure with the interval number synthetically evaluating the similarity value obtained from the cloud model. The reliability prediction value of the meta-action motion unit is substituted into the mathematical model, and the reliability of the parent motion unit is predicted layer by layer, thus the reliability level of the whole product is obtained. Finally, the numerical control turntable is analyzed as an example, the reliability prediction value is obtained, and the method is compared with the traditional method. The results show that the new reliability prediction method is feasible and accurate.
【作者单位】：重庆大学机械工程学院;重庆大学机械传动国家重点实验室;
【基金】：国家自然科学基金资助项目(51575070,51305418) 国家科技重大专项(2014ZX04001-031,2015ZX04003003-07,2015ZX04003003)
【分类号】：TB114.3

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