摘要
提出一种基于表面振速预报辐射声场的近似方法——单元辐射叠加法。研究表明,声传递向量中的每项元素等于对应单元以单位速度振动、其它单元振速都为零时的辐射声压,即刚性障板上活塞面以单位速度振动时的辐射声压。在此基础上,利用刚性障板上单位速度振动活塞面的辐射声压直接建立表面振速与辐射声压之间的传递关系,根据这个传递关系对表面振速进行加权、求和便得到总的辐射声压。计算时采用规则形状障板面去拟合实际障板面,以规则形状障板上振动活塞面的辐射声压去近似实际障板上振动活塞面的辐射声压。相对于边界元方法,该方法在计算速度与存储空间上具有很大的优势。计算表明该近似方法是合理的、可行的。
An approximate method is brought forward to predict the acoustic pressure based on the surface velocity. It is named Element Radiation Superposition Method. The study finds that each element in ATV equals the acoustic pressure radiated by the corresponding surface element vibrating in unit velocity and other surface elements keep still, that is the acoustic pressure radiated by the corresponding baffled piston vibrating in unit velocity. So, it utilizes the acoustic pressure radiated by a baffled piston to establish the transfer relationship between the surface velocity and the acoustic pressure. The total acoustic pressure is obtained through summing up the product of the surface velocity and the transfer relationship. It adopts regular baffles to fit the actual baffle in order to calculate the acoustic pressure radiated by a baffled piston in calculating. This approximate method has a large advantage in calculating speed and memory space relative to Boundary Element Method. Numerical simulations show that this approximate method is reasonable and feasible.
出处
《声学学报》
EI
CSCD
北大核心
2008年第3期226-230,共5页
Acta Acustica
