Enginerevolution should not exceed the maximum permissible.
发动机的转数不应超过所允许的最大值。
2
Then the author analyses the effect of the frame vibration and tries to make the natural frequency of vibration beyond the range of enginerevolution rate.
分析了发动机振源对车架振动的影响，使车架主要模态的自振频率避开了发动机转速范围；
3
Simulations about reducing noise excited by enginerevolution are done by laying secondary source at proper places on the simplified finite element model of a passenger car.