Dissertation > Transportation > Waterway transport > Marine Engineering > Ship machinery > Ship shaft,gear,and car device > Gearing

The Analysis of Acoustic Vibration Characteristics on the Damping Structure of Reducer for Ship

Author JiaoJian
Tutor LiangTingWei
School Harbin Institute of Technology
Course General and Fundamental Mechanics
Keywords damping structure plates boundary element method FEM-AMLmethod acoustic vibration coupling
CLC U664.22
Type Master's thesis
Year 2013
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High-power marine gear transmission is one of the important equipmentturbine systems. Its structure is very complex, high precision, and in high-speed,heavy-duty operating conditions. The working environment is very complicated.Gear system during operation, most of the energy transmitted to the gear box andthe housing partition.With the development of modern manufacturing technology improved,breakthroughs in materials science, heat treatment process improvements as wellas related scientific and technological advances, are gradually moving in high gear,heavy duty, low noise, high reliability direction. Making gear vibration and noiseissues becomes increasingly prominent. Gear system generates noise and vibrationcontinued instability of drive systems, and because of increased vibration, causeswear, fatigue, deviate from the theoretical movement of the actual law of motion,so that errors occur, reducing the work gear system security and reliability andquality of work, serious and can even cause damage to the gear or other parts ofthe driving system failure and serious consequences. Therefore, the systemvibration and noise control has become an important research topic.This article is a test piece gearbox damped structures studied, the test piecefrom the grassroots plate, damping layer, and constraints assembled panels of threeparts, which will add HY121type, PD-1and perfusion-type three kinds ofhigh-performance damping material, each of which the thickness of the dampingmaterial damping in turn were taken5mm,10mm and15mm for research andanalysis, so we have a total of nine damped structures on test pieces for soundinsulation performance analysis. We compare two methods: boundary elementmethod and FEM-AML, used in the comparison is incentive, the boundaryelement method to test modal analysis, by comparing FEM-AML method is moreefficient, more suitable for engineering application.There are strict standards on the measurements in engineering practicereducer box sound insulation quantity in acoustic measurements in the laboratory,and imitate the acoustics lab environment. This paper established a finite elementmodel of reverberation chamber and quieter room, using the method of FEM-AML damped structures under reverberation sound source excitation arecalculated by the simulation experiment of sound insulation quantity, as the guidefuture gearbox Case studies of vibration and noise reduction provides a goodfoundation.

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