• Title/Summary/Keyword: Structural Vibration and Noise

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Improvement of Interior Booming Noise in the Vehicle Using the Structural Dynamic Modification (구조물 동특성 변경을 이용한 실내 부밍 소음 개선)

  • Kim, Young-Ha;Lee, Jae-Woong;Kim, Sung-Gi
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.04a
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    • pp.354-359
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    • 2012
  • Improvement of structure-borne noises in the vehicle compartments has been one of the primary concerns in the development of vehicles. The booming is an annoying low frequency interior noise and vibration in vehicle. But it is difficult to reduce the structure-born booming noise in traditional method - trial and error within the shorten development schedule. So in present, the structure dynamic modification (SDM) method helpful to predict the effect of the local mass, stiffness, and damping is introduced. So in order to reduce the interior booming noise, the SDM was performed, and verified with modal test result. It was shown that the interior booming noise was reduced as predicted.

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A Case Study to Minimize Effect of Blasting Vibration and Noise on Animal Casualties (발파진동과 소음이 가축에 미치는 영향에 관한 사례연구)

  • 안명석;김종대;황소중
    • Journal of KSNVE
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    • v.11 no.1
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    • pp.104-110
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    • 2001
  • The demand of blasting work in civil engineering work is increasing because of the increasing social infra-structural construction work. The blasting method creates large benefit in regard to the economic aspect and shortening construction period. This method, however, has problems to be solved in respect to the blasting vibration and noise. Blasting vibration and noise have been studied by many workers, regarding to the impact on the structure and human body. This investigation is concerned on the affect of blasting vibration and noise on the animals which is relatively new. In general, animals have inferior mental capacity than human in hearing but have higher sensitivity on the vibration and noise due to blasting. The object of this study is to investigate an appropriate measurement of lessening damage on the animals by vibration and noise due to blasting.

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Computational Vibration and Characteristic Analyses for Tilt-Rotor Vehicle Considered 3-Dimensional Supporting Equipment Structures (탑재장비 3차원 지지구조 형상을 고려한 틸트로터 항공기 전산진동해석 및 특성분석)

  • Kim, Yu-Sung;Kim, Dong-Hyun;Kim, Dong-Man;Lee, Jung-Jin;Kim, Sung-Jun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.1000-1007
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    • 2007
  • In this study, structural vibration analyses of a smart unmanned aerial vehicle (UAV) have been conducted considering dynamic hub-loads of tilt rotor. Practical computational structural dynamics technique based on the finite element method is applied using MSC/NASTRAN. The present UAV(TR-S5-04) finite element model is constructed as a full three-dimensional configuration with different fuel conditions and tilting angles for helicopter, transient and airplane flight modes. In addition, the 3-dimensional supporting equipment structures of electronic devices are considered for vibration analysis. As the results of this study, transient structural displacements and accelerations are presented in detail. Moreover, vibration characteristics of structural parts and installed equipments are investigated for different fuel conditions and tilting angles.

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