在设计工业产品时,通常是作系列设计,同一系列不同型号、不同规格产品之间的主要区别是尺寸不同,式样却相类似。在这种情况下,如何鉴定所设计产品的相似性就显得十分重要了。鉴定机械零件是否相似,最好的方法就是考察其挠度,而不是应力。许多设计之所以失败,一究其原因,不是因为应力超过了材料的极限强度,而是由于过量的变形和振动引起的。采用传统的设计方法来确定机械零件的最佳尺寸,常常会失效。现有的强度理论认 In the design of industrial products, usually for a series of design, the same series of different models, different specifications of the main difference between products is different size, the style is similar. In this case, how to identify the similarity of the designed product is very important. Identification of mechanical parts are similar, the best way is to examine the deflection, rather than stress. The reason why many designs fail is not the reason that the stress exceeds the ultimate strength of the material but rather due to excessive deformation and vibration. Using the traditional design method to determine the best size of mechanical parts, often fail. Existing strength theory admits