%A LUO Zhi (罗智), HAO Zhi-yong* (郝志勇), ZHENG Xu (郑 旭)
%T Precision Improvement of the Discrete Calculation Method for Sound Radiation Research
%0 Journal Article
%D 2015
%J J Shanghai Jiaotong Univ Sci
%R 10.1007/s12204-015-1616-9
%P 415-419
%V 20
%N 4
%U {https://xuebao.sjtu.edu.cn/sjtu_en/CN/abstract/article_42499.shtml}
%8
%X Sound radiation of thin plates is a common problem in engineering. Hashimoto proposed the discrete
calculation method (DCM) to deal with the problem. The calculation of the radiation impedance of the rectangular
element is more cumbersome than that of the circular one, so the discrete rectangular radiation element is
approximated by the circular one. However, error is also introduced. The formula developed by Sha has been
employed to get self- and mutual-radiation impedances of rectangular radiation element. Numerical study was
performed to verify error introduced by the approximation Hashimoto adopted. Experimental researches on sound
radiation of a 2mm-thick and a 4mm-thick magnesium alloy plates were also carried out to evaluate the errors
introduced by the approximation. The experimental results indicate that the circular approximation Hashimoto
adopted overestimates the sound radiation efficiency. The maximum error levels of the radiation efficiencies of the
2mm-thick and 4mm-thick magnesium alloy plates are up to 0.15 and 0.12, respectively. The effect of element
aspect ratio on the sound radiation efficiency is also remarkable.