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DC FieldValueLanguage
dc.contributorDepartment of Building Services Engineeringen_US
dc.creatorLee, Tsz-yuen-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/6242-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic University-
dc.rightsAll rights reserveden_US
dc.titleVibration isolation under an elastic foundationen_US
dcterms.abstractDifferent building services machines such as pumps, chillers and fans are usually placed in one mechanical plant room. Vibration may be transmitted indoors through the building structure as structure-borne sound. The vibration transmitted may generate noise which causes noise disturbance to residents inside the building. Although vibration isolation at the support of those machines can reduce the vibration transmitted and isolate them from the building structure, all of these machines produce vibration with unbalanced rotating shafts and unsteady forces to affect the isolation efficiency. One of the vibration isolators may affect other isolators under supporting foundation. Although much research focused on the vibration isolation of mass-spring-dashpot system approach between machines and structure, little has been conducted study on the influence of the efficiency between different vibration isolators under elastic foundation at supporting points. Therefore, this study is an investigation on the effects of the vibration isolation under an elastic foundation. In this project, a physical model was used to simulate the most practical situation of vibration isolation under an elastic foundation in a mechanical plant room. Also, the transverse wave equation of the beam motion supported by elastic foundation with a single and multiple force excitation were developed and compared with the experiment results. This study also defined, analyzed and validated from the experiment results. It is found that the resultant motion of the beam is obviously influenced by the magnitude and the frequency of the applied force and the vibration profile is contributed by the cross mobility. The study will be useful to engineers who are concerned about controlling building noise and vibration.en_US
dcterms.extentxiii, 102, [24] leaves : ill. (chiefly col.) ; 30 cm.en_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2011en_US
dcterms.educationalLevelAll Masteren_US
dcterms.educationalLevelM.Eng.en_US
dcterms.LCSHVibration.en_US
dcterms.LCSHDamping (Mechanics)en_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsrestricted accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/6242