Express the differences of displacement variation of a mass subjected by a free damped vibration and a forced vibration , separately 分别叙述一质量受到无阻尼的振动与强制振动时位移变化的不同。
Ceramic material had better performance than steel and copper and the shorter the stack , the lower the initial temperature for oscillation 而从热声振动的方式来看,强制振动比自激振动具有更低的起振温度。