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振动结构中功率流的测量 总被引:10,自引:0,他引:10
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。 相似文献
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赵其昌 《声学学报:英文版》1988,(3)
The evaluation of power flow in vibrational structure is treated theorettaly,experimentally and bycomputer simulaion.It is shown that the bending wave power can be messured with two transducers,as longas the error caused by near-field is known well.The method is very similar to the sound power measurement inair.The error caused by this way is calculated.Comparison between measured and theoretical results showsthat in thin rods the bending wave power can be calculated with the accuracy better than 2 dB.At lowfrequencies 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.. 相似文献
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在无损检测领域中换能器的灵敏度应该是一个重要的特性,但对于超声探伤用的换能器的灵敏度至今还没有一个有效的方法来进行测量。本文把换能器看成是平面源,推得了它在远场条件下的互易参量。并采用互易技术在固体样品中校准了超声换能器的灵敏度,实验表明超声探伤用的换能器的发送和接收灵敏度是能够精确测量的,在一定的耦合条件下,测试总精确度在±1dB以内。 相似文献
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