壳式管道管壁振动能量流的测量方法

本文通过推导壳体型管道管壁振强,求得用表面振动量描述的管壁能量表达式,借助差分法化解偏导数,采用时域内测量频域内等效计算的方法实现了管壁能量流的测量.

Measurement Method of Vibrational Energy Flow in Wall of Shell-type Pipe

In the light of structural intensity theory and the shell equations, the vibrational energy flow e- quations in wall of shell-type pipe are established in terms of surface vibration displacement, and are simplified through time and space averaging. To make energy flow measurement feasible and realizable, the following three transformations in the equations are carried out. Firstly, the energy flow expressed by the middle surface vibration should be transformed into the one expressed by outer surface vibration. Secondly, the governing differential eqations of the energy flow should be expressed by the difference equations. And finally, the three factors of the energy flow expressed by both displacment variable and velocity variable are transformed into the those expressed by acceleration only. The measurement theory and method on the energy flow in wall of the pipe are presented in this paper. The correctness and feasibility of the measurement theory and the method on vibrational energy flow have been verified by the experiments given by authors.