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http://dx.doi.org/10.5050/KSNVN.2008.18.1.026

Radiated Noise Analysis of Marine Diesel Engine from Structural Vibration  

Kim, Dae-Hwan (부산대학교 기계공학부)
Jeong, Weui-Bong (부산대학교 기계공학부)
Park, Jeong-Geun ((주)STX 엔진)
Hong, Chin-Suk (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.18, no.1, 2008 , pp. 26-34 More about this Journal
Abstract
This paper summarizes a design procedure of radiated noise from engine blocks of marine engines. This air-borne noise is one of the significant noise contributors including the aeroacoustic noise due to intake and exhaust and the re-radiation due to structure-borne noise. Excitation forces by engine operations are evaluated taking into account the power generation mechanism from the burning process to the subsequence motion of internal parts; piston, connecting rod, and crank shaft. The acoustic transfer vector method is incorporated to effectively simulate the radiated noise field under the various operation conditions. A contribution analysis for the various excitations to the radiated noise is conducted. It is found that the firing pressure is the main source of the radiated noise, and so the structure of the cylinder can be modified to significantly reduce the radiated noise from the engine block.
Keywords
Radiated Noise; Air-borne Noise; Diesel Engine; Firing Pressure; $p-{\theta}$ Curve; ATV(acoustic transfer vector);
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