摘要
本文把多自由度线性动力系统的传递函数(TF)及脉冲响应函数(IRF)[1]*之间的关系简化为公式(3)、(4)*形式.对于由基础(其传递函数Ho已知)和两个质量块(其中一个与基础刚性连接,另外一个弹性连接,见图1及公式6)组成的系统,本文推导了系统的设计公式.为了展示这种方法的应用,本文利用了不同的传递函数Ho值分析了在脉冲载作用下若干种结构支力分析问题,这些结构包括具有及不具有基础隔震的系统(图1;公式(3);(6)*)、位于地基上的具有隔震装置的板.利用这种方法不需要振型展开,从而不需要求固有振型及不需要进行标准化.
The dependencies between the transfer function (TF) and impulse responce function (IRF) in the linear dynamic systems with finite degrees of freedom are reduced to form (formula 3, 4) The article shows the derivation of the formula for design of a system consisting of a support structure, which transfer function (Ho) value is known, and of two additional weights one of which is connected to the support structure by a firm coupling and the other-by elastic coupling (drawing 1 ; formula 6). To illustrate the method we use various values for Ho to derive solutions for a number of structural analysis problems for structures under impulse force: vibration-isolated and non-vibration-isolated foundations ( drawing 1 ; (3) ; (6) ; floorings and slabs rested on the ground (4) with installed vibration-isolated and non-eigenmode expansion thus making the building of eigenforms and normalization thereof unnecessary.
出处
《北京建筑工程学院学报》
2010年第1期32-37,共6页
Journal of Beijing Institute of Civil Engineering and Architecture