前言 我厂设计制造的各类试验机,历史上在试车中曾发生过多起由于零件强度不够而损坏断裂的现象,如机械振动台激振器壳体台面被振断,凸轮跌落式碰撞台凸轮滚子轴被冲断,等等。这是一种状况。至于那些没有发生过破坏现象的大多数重要零件,毫无疑问其强度是足够的,然而并不能说明其设计是合理的。因为有些重要零件其强度储备富余太大,以致笨重之极,既增加了机器的体积重量和成本,同时又浪费了国家大量高级合金钢。例如1979年设计一新产品电液振动台时,对同类型老产品 Preface I design and manufacture of various types of testing machine factory, in the history of the test had occurred in the test too many parts due to insufficient strength and damage the phenomenon of fracture, such as mechanical vibration table exciter shell mesa is broken, the cam-drop collision Taiwan Cam roller shaft is punched, and so on. This is a condition. As for most of the most important parts that have not been damaged, there is no doubt that their strength is sufficient, but this does not mean that their design is reasonable. Because some of the important parts of its strength reserve surplus too large, so cumbersome, both to increase the machine’s weight and cost, while wasting a lot of the country’s high-grade alloy steel. For example 1979 when designing a new product electro-hydraulic shaker, the same type of old products