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我国《动力机器基础设计规范》(GBJ-79)规定对于工作转速≤1000rpm的框架式电机基础只作横向水平振幅计算。横向水平振幅包括水平摇摆振幅和绕竖轴的扭转振幅。关于水平摇摆振幅计算已在文献[2]中进行了较详细讨论,这里只讨论扭转振幅的计算方法。《动规》中的扭转振幅计算采用单质点模型,假定(1)地基的抗扭刚度为无穷大,不考虑地基的弹性而只考虑上部结构的弹性;(2)
China’s “Code for Basic Design of Power Machines” (GBJ-79) stipulates that horizontal frame amplitude calculation is only performed for frame-type motor bases with a working speed of ≤1000 rpm. Horizontal horizontal amplitude includes horizontal swing amplitude and torsional amplitude around the vertical axis. The calculation of horizontal swing amplitude has been discussed in detail in [2], and only the calculation method of torsional amplitude is discussed here. The torsional amplitude calculation in the “mobility regulations” uses a single-mass model, assuming that (1) the torsional stiffness of the foundation is infinite, regardless of the elasticity of the foundation and only the elasticity of the superstructure is considered; (2)