Abstract
The engine vibration gives rise to pressure fluctuation of water coolant; therefore, the coupled system between engine structure and acoustic field of water coolant passage needs to be established to calculate the response of engine vibration and water coolant pressure fluctuation. A rectangular tank is used to evaluate water pressure induced by structural impact vibration. The dynamic characteristics of structural-acoustic coupled system are discussed by changing water depth. Considering the resonance effect, the relationship between natural frequencies of structure and acoustic field is examined by variation of sound speed. The equation of motion of engine structure coupled with acoustic field of water coolant passage is established to calculate coolant pressure fluctuation during engine working condition. The effect of piston slap forces on pressure fluctuation is evaluated. The influence of acoustic characteristics of water coolant passage on pressure fluctuation is discussed by varying sound speed.
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