点力和线力作用下的结构振动响应研究

STUDIES ON RESPONSES OF STRUCTURE EXCITED BY POINT FORCE LOAD AND CIRCLE FORCE LOAD

建立了平板结构在点力载荷和线力载荷作用下振动响应的理论模型 ,应用该模型计算出简支平板在两种载荷作用下的振动响应 ,然后进行比较分析。通过实验研究了点力载荷与实际惯性激振器产生的线力载荷作用下简支平板振动频响函数的差别。研究表明 ,点力载荷和线力载荷作用下的振动响应有一定差别 ,线力作用的圆环直径越大 ,这种差别越大 ,且高频段较低频段表现更为明显。

A panel excited by either point force load or circle force load is modeled to study its vibration responses. Based on the theoretical model, the responses of a simply supported flat panel under two types of excitations are predicted and analyzed. The response differences between point force load produced by an exciter and circle force load produced by an inertial shaker are measured. And the vibration responses of panel excited by the two types of loads are different: The bigger the circle diameter, the more the difference is and the differences at high frequency ranges are more obvious than that at low frequency ranges.