Hydraulic exciting vibration is a kind of liner one . the vibration direction is arbitrarily adjustable and the exciting force not only has a large value but can vary adapting to the load 激波器可产生一种直线线性振动并且具有:激振力大,振动方向任意可调,振动频率和振幅能够实现单独无级调整等优点。
At last the results obtained are compared with those of t - beams , which shows : 1 ) the base frequency of t - beam and box girder bridge is different not only in the value but also in vibration direction 通过与此无关t型梁自振特性的结果进行比较,得出了一些重要结论:从t型梁到整体箱梁,梁的基频发生了改变。
Finally , the improved method is utilized to identify data acquired by vibration test of a honeycomb sandwich structure with different magnitudes , locations or vibration directions , and the identification results are used to analyze the characteristic of the structure in order to guide the further study of satellite structure ’ s design 最后利用改进后的dbm方法对几组在不同量级、不同振动方向、不同测点的蜂窝板夹层结构的振动数据进行辨识,并利用辨识的结果对于结构的动力学特性进行分析,从而为实现对卫星结构的设计提供依据。