CAJ | 학술논문

基于径向形函数可任意变阶的映射波包络声学无限元法，以无限长圆柱壳体为研究对象，用数值计算方法对其结构外声场进行研究分析，并与其解析解进行对比，结果表明：两者之间能够较好地吻合，从而验证了映射变阶波包络声学无限元法在计算结构声辐射中的可行性，且具有效率高、精度好等优点。在此基础上，本文还讨论虚拟极点位置对声辐射的影响，通过对比四极子极点偏心声压值发现：极点存在偏心时，对实际工程问题有不利影响，但随声学无限单元阶数的增加，误差会减小。
기우경향형함수가임의변계적영사파포락성학무한원법，이무한장원주각체위연구대상，용수치계산방법대기결구외성장진행연구분석，병여기해석해진행대비，결과표명：량자지간능구교호지문합，종이험증료영사변계파포락성학무한원법재계산결구성복사중적가행성，차구유효솔고、정도호등우점。재차기출상，본문환토론허의겁점위치대성복사적영향，통과대비사겁자겁점편심성압치발현：겁점존재편심시，대실제공정문제유불리영향，단수성학무한단원계수적증가，오차회감소。
This paper is on the basis of a variable order in radial direction infinite acoustic wave envelope ele-ment (WEE). Numerical method is adopted to study the sound radiation pressure of an infinitely long cylin-der as the subject investigated, and obtained results agree well with analytic solutions. The research presents that the variable order infinite acoustic wave envelope element which can be successfully applied to sound radiation pressure computation field is proven. The WEE has obvious advantages such as high efficiency and high degree of accuracy. Based on the above results, this paper also describes the influence of virtual sound source’s location in sound radiation, and it can be concluded that the decentration of virtual source has bad effects on the actual project by comparing the sound pressure values of quadrapole. However, with the increased orders of infinite acoustic element, the inaccuracy of sound pressure is decreasing.