Noise and Vibration Characteristics of a 3 kW-class Stirling Engine

Abstract

In recent years, a wide variety of papers on the Stirling engine and its unique properties have been published. However, the available knowledge on noise and vibration characteristics of Stirling engines is very limited. This paper presents experimental results which are useful for modifying the engine parts influencing the noise and vibration characteristics of the reciprocating kinematic Stirling engines. In order to clarify the noise and vibration sources of a 3 kW-class Stirling engine, the modal analysis for the engine parts and the measurement of sound intensity were examined. As a result, it was clarified that modifications for the combustion system and the driving system, particularly with respect to the crankshaft, can be made for decrement of the engine noise and vibration. Through the application of the proposed modifications, the 1987 engine noise was greatly decreased, and the 59 dB(A) noise level was measured under normal conditions.