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采用常规方法进行活塞式压缩机零部件的强度设计时,把各种参数,如材料的强度指标、零部件的尺寸、所受的载荷等看作是确定量,忽略了由于各种变化条件使这些参数发生变化的随机因素。使所设计的零部件结构尺寸不能准确适应实际工作的需求。此外,由于对设计参数的统计规律缺乏了解,在确定安全系数时,往往取得偏大,而使设计的零件结构尺寸也偏大,导致了材料的浪费和成本的提高。因此,只有在设计中考虑到各种随机因素的影响,将全部或部分设计参数作为随机变量处理,对其进行统计并建立统计模型,运用概率统计方法进行设计计算,才能全面地描述设计对象,使所得的结果符合实际情况。我们把这种用概率统计方法进行的设计称为可靠性设计。可靠性设计方法既可用于压缩机零部件的静强度计算,也可以用于疲劳强度计算。仅就静强度的可靠性设计作一简要介绍。
The conventional method of piston compressor strength design, the various parameters, such as material strength indicators, the size of components, the load suffered as a certain amount, ignoring the various conditions of change Random factors that change in these parameters. So that the design of the structural dimensions of parts can not accurately meet the needs of the actual work. In addition, due to the lack of understanding of the statistical laws of the design parameters, the design of the safety factor often get too large, leaving the design of the parts size is too large, resulting in material waste and cost increases. Therefore, only considering the effects of various random factors in the design, all or part of the design parameters as a random variable to deal with its statistical and statistical models to establish the use of statistical methods to design and calculate the probability to fully describe the design object, The results obtained in line with the actual situation. We refer to this design of probability and statistics as reliability design. The reliability design method can be used both for static strength calculation of compressor components and for fatigue strength calculation. Only a brief introduction to the reliability of static strength design.