Fuzzy Reliability Analysis Of Parts Under Multiple Loadings

In this paper, we study the following two aspects about the fuzzy reliability of partsunder multiple loadings:(1) For the case of the load and strength which are fuzzy variables, and considering thenumber of loadings, we use the load-strength interference model theory and fuzzy theory, andthen we set up the fuzzy reliability calculation model for parts. In a state under the hypothesis,we give the digital simulation method and analytic method of the fuzzy reliability, and takinguniform distribution for example, when the density function of the corresponding probabilitydistribution are evenly distribution, linear distribution and tail normal distribution in thecorresponding cut sets level. In fuzzy state, we give the calculation of components reliabilityand numerical examples.(2) Based on the impact theory, on one hand, we give the calculation of componentsreliability and numerical examples, when the process of load acting is described with theshock process for the repeated impact load, which the accumulative damage is blurry. On theother hand, using the model data fitting method, we set up the reliability and failure ratecalculation model for parts, taking impact times as life measures. Based on the above, we givethe change rule of reliability and failure rate of parts in the different forms of membershipfunction, when the cumulative damage is fuzzy.