摘要
在测量全息面三维声强和均方声压的基础上,根据平面上二维切向有功声强与复声压相位间的关系来间接获取复声压的相位,结合测得的均方声压,得到全息复声压;根据全息面上微粒法向振速的叠加原理和波数域的 Euler公式,推导出基于单全息面三维声强测量的声场分离公式,将全息面两侧声源各自在全息面上产生的声压分离开来。在全息面两侧均有声源的情况下,实现噪声源的识别与定位,克服了近场声全息(NAH)和基于声强测量的宽带声全息(BAHIM)的应用局限性。数值仿真的结果证明了该技术的可行性和有效性。
The complex pressure phase was obtained by measuring the two-dimensional tangential acoustic intensity and the quadratic pressure, then the complex pressure was obtained. The formula of the sound field separation technique based on measurement of the three-dimensional acoustic intensity with single holographic plane was established according to the superposition theory of particle velocity and the Euler equation in wave number domain, and the acoustic pressure caused by the sound sources on one side of holographic plane was also obtained. So the near-field acoustic holography can be used to realize identification and localization of the noise sources in industry, it also overcomes the application limitations of the near-field acoustic holography (NAH) and broadband acoustic holography from intensity measurement (BAHIM). The results of the numerical simulation testify its feasibility and effectiveness.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2005年第6期523-526,共4页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50275044)
教育部科学技术重点项目基金资助项目(02126)
关键词
声全息
声源识别
声场分离
单全息面
三维声强
acoustic holography
sound source identification
sound field separation
single holographic plane
three-dimensional acoustic intensity
