(半)自由声场自动校准装置研制及实验研究

Research on Development and Experiment of the Automatic Calibration Device for Free Sound Field and Hemi-free Sound Field

对(半)自由声场自动校准方法进行了研究,完成了(半)自由声场自动校准装置的研制,实现了消声室内(半)自由声场的自动测量。分别对白噪声和纯音信号在连续测量和间隔测量下的自由声场范围进行了研究,提出了相应的数据测量方式。当对自由声场范围准确度要求较高或半消声室本身空间较小的情况下,声源为白噪声时以2 cm的间隔进行测量,声源为纯音信号时以2 cm的间隔或者2 cm/s的速度进行测量;相反情况下,声源为白噪声时以10 cm的间隔进行测量,声源为纯音信号时以5 cm的间隔或5 cm/s的速度进行测量。该研究为准确、高效地确定消声室自由声场范围提供了较为实用的参考。

The automatic calibration methods for hemi-free sound field are studied, and the R＆D of the automatic calibration device for free sound field and hemi-free sound field is completed to implement automatic measurement of free sound field and hemi-free sound field in anechoic room. Different free sound field ranges under white noise and pure tone signal in continuous measurement and interval measurement are researched respectively, and corresponding measurement modes are proposed. When higher accuracy is requested for free sound field range, or the space of hemi-anechoic room is smaller; 2 cm interval measurement is conducted for sound source of white noise; 2 cm interval measurement or 2 cm/s speed measurement is conducted for sound source of pure tone signal ; in opposite case, 10 cm interval measurement is conducted far sound source of white noise; 5 cm interval or 5 crn/s speed measurement is conducted for sound source of pure tone signal. These provide practical reference to determine the free sound field range of anechoic room more precisely and effectively.