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Tuesday, July 9 • 11:10 - 11:30
RESEARCH ON THE VIBRATION REDUCTION AND SOUND RADIATION INDEX PROPERTIES OF THE CABIN WITH INTERNAL EQUIPMENT

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It's important to choose suitable vibration and noise indices for structure analysis and validated test, and it can provide technical direction for vibration and noise reduction. In this paper, the vibration reduction index of a single degree of freedom system is analysed to illustrate the influence of the impedance of the foundation. The finite element method (FEM) and the boundary element method (BEM) are applied to simulate the vibration and noise indices of a cabin with internal equipment. The vibration reduction and sound radiation indices of the internal isolator have been calculated to analyse the variation trend with frequency. The results indicate that the difference between vibration level difference and insert loss is very small in most frequency band. The power flow difference and radiated sound power are opposite in phase in middle and high frequency band, and they are appropriated to comprehensively evaluate the vibration and noise indices of the cabin.The analysis method and procedure can be used to objectively evaluate the vibration reduction property of other vibration isolators.

Moderators
avatar for Tom Dakin

Tom Dakin

Sr. Staff Scientist, acoustics program, Ocean Networks Canada
IU

Ildar Urazghildiiev

Senior Research Engineer, JASCO Applied Sciences (USA) Inc.

Authors

Tuesday July 9, 2019 11:10 - 11:30 EDT
Westmount 5
  T12 Underwater & marit. noise, SS02 Ship & harbr noise & vibr