摘要
本文对振动结构中功率流进行了理论上和实验上的研究,并用计算机进行了模拟计算。研究表明如果近场的影响搞清楚,可以仅用两只加速度计来测量弯曲波的功率,与空气中声功率测量很相似。本文计算了这方法引起的误差,在薄棒中弯曲波功率的测量值与理论值相比在2dB以内。低频误差主要来自近场的影响,高频则主要是换能器之间的间距,换能器的质量,以及相位差等的影响。
The evaluation of power flow in vibrational structure is treated theoretically, experimentally and by computer simulation. It is shown that the bending wave power can be measured with two transducers, as long as the error caused by near-field is known well. The method is very similar to the sound power measurement in air. The error caused by this way is calculated. Comparison between measurement and theory shows that in thin rods the bending wave power can be calculated with an accuracy of better than 2 dB. At low frequencies the limiting factor is the near-field influence, at high frequencies it is the transducer separation, the mass loading by the transducers and the phase difference, etc.
出处
《声学学报》
EI
CSCD
北大核心
1989年第4期258-269,共12页
Acta Acustica
