方形平板辐射体轴向声压计算及测试

A study on the acoustic distribution of axial radiation for bending vibration square radiator

选择方形平板辐射体节线外侧为等腰直角三角形振动面的响应振型为工作模态,推导了一种计算方形平板辐射体轴向声压的数值方法.以算例中不同几何尺寸方形平板辐射体为例,分别计算了其轴向声压的分布规律.计算结果表明:不同几何尺寸方形平板辐射体在其近场区域,声压随距离的增大均有较大的起伏变化,在远场区域声压随距离的增加缓慢衰减.最后,对算例中的2#方形平板辐射体的受迫振动响应振型及轴向声压进行了实验测试,测试结果与理论计算结果基本一致.

In this paper, the theoretical method of calculating the axial sound pressure of square radiator has been deduced by using the numerical method.The response modes of square plate radiators with isosceles right triangular vibration surface on the outer side and rhombus in-phase vibration surface on the inner side have been selected as working modes, taking the square plate radiators with different geometrical sizes as examples, and the axial radiated sound pressure has been calculated respectively. The results show that the axial sound pressure of the radiator varies greatly with the increase of distance in the near field, and decreases slowly with the increase of distance in the far field. Finally, the 2# square radiator in the example has been tested, and the test results are basically consistent with the theoretical calculation.