Triple integral expression of the radiation impedance of square piston is deduced and the numerical results of the radiation impedance are calculated with the method of Gaussian numerical integral.
利用高斯数值积分方法，推导了方形活塞辐射阻抗的三重积分表达式，计算了方形活塞声源的辐射阻抗。
2
Piston, method for manufacturing the same, and cylinder component with the same.
活塞，用于制造该活塞的方法，和设置有该活塞的缸组件。
3
Based on ideal gas equation, the measurement method of diesel engine piston combustion chamber volume was researched.