Application of the structural dynamic modification (sdm) method to reduce noise and vibration of vehicle hvac system
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Date
2018-05
Authors
Mohamad Syazwan Md Isa
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Abstract
Heating, ventilating and air-conditioning (HVAC) system represents a major source
in vehicle noise and vibration that contribute a negative effect on the acoustical
environment. The operating system itself have produce a significant vibration which
subsequently produced an unwanted noise. Noise is amplified when the vibration of
components transferred to other components and excites its natural frequency. Natural
frequency of a components is depending on its mass and stiffness and can be modified by
these two parameters. This study is focusing on the specific HVAC noise and vibration
reduction by implementing structural dynamic modification (SDM) method to one of the
component involved. The lab-scale of HVAC system is set up to represent the actual HVAC
system at the vehicle level. Noise and vibration of HVAC system in vehicle and system
levels are measured and compared. From this data, the Dynamic Vibration Absorber (DVA)
is designed and applied for a specific component of the HVAC system. The results show
that, the natural frequencies of component have been shifted which resulting a wide
effective frequency range of 100-500 Hz. The effect of DVA also been observed for the
operating HVAC system whereby a significant vibration attenuation has been achieved for
operating frequency range of 100-300 Hz.