【摘要】 流管试验中由于管道响应不同频率下声压起伏很大,影响测量精度,为此在流管实验装置中发展了一种声源反馈控制方法,以管道内的声压信号为反馈信号,通过改变声源系统中信号源输出信号来调节不同频率下管道内的声压大小。本文分析了反馈次数,反馈信号采集卡量程以及反馈采样时间等因素对反馈控制结果的影响。该方法原理简单,易于实现,其控制思想可应用于其他实验装置的声源控制中。更多还原

【Abstract】 The acoustic pressure in Flow Impedance Test Rig(FITR)varies greatly at different frequencies because of the response of the duct,this phenomenon will influence the measurement precision.In order to solve the problem,a feedback control method for sound source system is developed.In this method,the acoustic pressure is used as feedback signal,and the response of FITR is adjusted by changing the output signal of function generator.The impact of the times of feedback control,the input range of feedback acquisition and acquisition time for the feedback result is studied in this paper.This method has simple principle and can be practise easily,so it can be used in other experiment facilities’ source systems.更多还原