Through comparison, it shows that at the same value of frequency and size, the far field of hexagonal piston is more uniform than that of circularpiston.
A built-up circularpiston sound source is established in this paper. The directivity formula of its far field is obtained, and its validity is simulated.
依据本文构造的组合圆形活塞声源，导出了该声源远场指向性公式，并对其正确性和有效性进行了仿真研究。
3
Thin, circular, steel bands fit into grooves around the piston to seal the bottom of the combustion chamber.