摘要
声阻抗管四传声器法能有效地测试材料的传递损失,但是在个别测试频段会出现较大的误差。为研究误差的机理以及降低误差,以自制声阻抗管为例,基于四传声器测试法进行传递损失的测试实验。基于实验结果分析误差的影响因素,确定声阻抗管的三个结构参数进行优化。采用有限元分析的方法计算获得管内的声场分布云图和传递损失曲线并验证仿真结果的准确性。利用遗传算法对三个结构参数进行优化,达到提高测试精度和减小误差的效果。
The four-microphone method of the acoustic impedance tube can be used to effectively measure the transmission loss （TL） of acoustic material. However, large errors would be observed at specific frequency of the test results. To investigate the mechanism and lower the error, experiments are conducted with a self-made impedance tube based on the four- microphone method. Specific factor analysis for the error is carried out, and three structure parameters of the impedance tube are determined to be optimized. The finite element method （FEM） is employed to calculate the internal sound field distribution and TL in the impedance tube. Based on the comparison between the experiments and the calculation, the Genetic Algorithm is preformed to optimize the three structure parameters, improve the measurement accuracy and reduce the error in testing TL.
出处
《机械设计与研究》
CSCD
北大核心
2017年第4期141-146,共6页
Machine Design And Research
基金
国家自然科学基金(51175320)
上海市自然科学基金(14ZR14186)资助项目
关键词
声阻抗管
传递损失
误差
有限元分析
遗传算法
acoustic impedance tube
transmission loss
error
finite element analysis
Genetic Algorithm
