Experimental Study on the Relationship between Combustion and Noise and Vibration in a Gasoline Engine

Abstract

An experimental study was conducted to clarify the relationship between engine combustion and noise and vibration. This study focused on the vehicle interior noise caused by combustion in which vibration transmission is the main component at high speed and high load region. A phenomenon in which both the combustion’s exciting force and the structure’s exciting force are combined is defined as vehicle interior noise caused by combustion. Conventionally, combustion and noise and vibration are often discussed in terms of average cycle, but considering the nonstationary property of noise and vibration, in this paper analyzed both exciting force for vibration in cycle-by-cycle. The heat release characteristics were determined as indicators for the combustion’s exciting force. The piston motion was determined as indicators of the structure’s exciting force. This paper clarifies the influence of each exciting force on vibration and discusses indexing that contributes to design.