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MACHINE MOUNTING FOR VIBRATION ATTENUATION Revision B By Tom Irvine Email tomirvine aol April 1 2000 Introduction Machines produce vibration This vibration can have a number of consequences The question arises How should a machine be mounted to the floor to minimize vibration effects

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Unitwave responsebased modeling of electromechanical noise and vibration of electrical machines Manuscript submitted 20 02 2009 Manuscript revised 06 05 2009 Date of the defence 26 6 2009 Monograph Article dissertation summary original articles

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Noise of electrical machinery is generated by the vibration of machine parts Gradual spread of vibration from the engine to the surroundings causes pulses of air with certain frequencies This creates a sound wave generator which can be within a certain frequency range audible to humans The main sources of noise in electrical machines are

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11 Mechanical noise mitigation Bearing noise and vibrations Modifiion of damaged ball bearing Use of chemical additives Use of vibration absorption or vibration isolation device Modifiion of rotating speed Use of alignment tools when mounting the motor Appliion of axial preload by means of coil springs Addition of elastic damping elements in bearing housing

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Introduce the concepts relating to Noise Vibration and Harshness Section 1 FUNDAMENTALS OF NOISE VIBRATION AND HARSHNESS Vibration level

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