振动速度级的确定依据是：先计算速度与基准速度之比的以10为底的对数，再乘以20，以分贝计。其数学表示式为Lv=20log（v/v0），基准速度必须表明，通常v0=10^(-9)m/s。
根据车用发动机的实际使用工况，在不同转速及爆发压力下对其进行动力学计算，得到发动机的表面振动速度级。
According to the actual operational condition of engine, calculate dynamics with different rotational speed and breakout pressure, and get the surface vibration speed stage of engine.
经管路模型试验和水泵机组试验证明，这两种隔振垫可使管路系统振动加速度级明显下降。
Through piping model test and pump unit trial it is shown that with the two types of isolating shims the vibration acceleration of the piping system can be reduced evidently.
在已知内层壳体振动速度的情况下，计算出流场中距外层壳体一定距离处的声压级。
The sound pressure level at certain distance from the outer shell in flow field is obtained when the vibration velocity of the inner shell is known.
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