Note on the modelling of the frequency response of an engine mount based on the engine vibration

The use of the mechanical impedance approach demands the determination of the exact value of the vibrational frequency ratio; the vibrational frequency ratio is the damping ratio at which the force transmissibility at peak impedance of an engine mount is determined. This is achieved by developing a dynamic model that consists of an apparent mass of the engine mount, the driving point mechanical impedance, and the transmissibility of the mount. This can be analyzed and simulated using a MATLAB code. In this study, the simulation results of the magnitude of the frequency response of the engine mount system to the engine vibration showed that at a low frequency, the magnitude of the response was 15.2 dB, while at a high frequency, the peak magnitude (vibration) was reduced to an average magnitude of − 3.27 dB. The practical interpretation of the simulation result is that, as the engine mount system is installed, the excessive vibration of the engine is reduced at the peak magnitude (vibration) even at a high frequency.