瞬态波位移场计算方法在相控阵声场模拟中的实验验证

通过实验研究了声束偏转不同角度和声场半径变化时线性相控阵的声场特性,并与基于瞬态波位移解析解的相控阵声场计算方法得到的理论结果进行了对比。首先研究了基于半圆圆弧离面瞬态位移的声场计算方法,并进行了数值计算可靠性的优化。然后建立了一套相控阵瞬态波位移场的测量系统,以半圆形钢板为试件,纵波传感器为接收传感器,测量了偏转角度为-10°,-30°,-50°,-70°,及声场半径为50 mm,75 mm,100 mm和125 mm时线性超声相控阵的声束指向性;同时以基于瞬态波位移解析解的相控阵声场计算方法,计算了相同条件下该相控阵的声束指向性。最后将实验结果与理论结果进行了对比,取得了较好的一致。说明基于瞬态波位移的相控阵声场计算方法可以较好地计算线阵的声场,对于声束偏转较大角度和声场半径变化时也同样有效。 

Experimental study of transient wave displacement field calculation in phased array sound field simulation

Experiments are proposed to study the sound field characteristics of linear ultrasonic phased array with different sound beam steering angles and sound field radius,and compared to the results from the calculation method of phased array sound field based on transient wave displacement analytical solutions.Firstly,the calculation method based on the transient off-plane displacement of semicircle arc is researched,and the accuracy of numerical calculation is optimized.Secondly,an ultrasonic phased array direcvity measurement system are established,semi-circular steel plates are used as the measuring specimens,and the longitudinal wave transducer is used as the measuring transducer.The beam directivity of linear phased arrayis measured at different steering angles (-10°,-30°,-50° and-70°) and sound field radius (50 mm,75 mm,100 mm and 125 mm).Then,the beam directivity of linear phased array is calculated numerically based on the transient wave displacement method with the same sets.Finally,the experimental results are compared with the theoretical results and agrees well with each other.It demonstrates the calculation method of phased array sound field based on transient wave displacement analytical solutions is accurate,as well as for sound beam steering large angles and sound field radius changing.