关键词: 近场声全息, 隔声测量, 重建参数, 法向声强, 优选

Abstract: Near-field acoustic holography has wide application prospects in the field measurement related to sound insulation of prefabricated buildings and components.In order to reduce the complexity of holographic measurement and improve the accuracy of sound field reconstruction，this study firstly used point sound source as an example to explore the variation law of sound insulation measurement accuracy with parameters by means of numerical simulation and experimental verification.Then it discussed the optimization range of parameters.Finally，this study veri-fied the effectiveness of the reconstruction parameters selected in this paper about sound insulation measurement.The results show that the simulation values are basically consistent with the experimental values.That is，the accuracy decreases with the increase of reconstruction distance and sampling spacing，while increases with the increase of holographic aperture.In addition，to best improve accuracy，the values of reconstruction distance and sampling spacing should not exceed the half-wavelength corresponding to the highest frequency，and the aperture of the holographic plane should be 1.5 times of the component size.By optimizing the reconstruction parameters，it can not only reduce the complexity of sound insulation measurement，but also improve the measurement accuracy，as well as obtain better sound insulation measurement accuracy，improving the engineering practicability of the near-field acoustic holographic sound insulation measurement technology.

Key words: near-field acoustic holography, sound insulation measurement, reconstruction parameter, normal sound intensity, optimization