Remove Unwanted Vibrations for HVAC by Altering Modal Frequency Using Finite Element Modeling and Validating Experimentally

Automotive Air Conditioning is the process of removing heat and moisture from the interior of an occupied space to improve comfort of occupants. Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC systems can be used in both domestic and commercial environments. It is made of plastic material and fitted inside the front dash panel, therefore, subjected to very high vibrations coming from engine and road. The main objective is to remove unwanted vibrations by altering the modal frequency. From the finite element analysis (FEA), very high deflection, cause unwanted vibrations reported on the HVAC assembly at low frequency (1st modal frequency) under dynamic conditions. Then, improved the design by adding the stiffeners on the flange to minimize that high deflection. Thereafter, modal frequency has been increased and reduced the high deflection. The same has been validated experimentally with proto sample and found no abnormal noise from the blower side. A good correlation between the FEA and experimental result is observed and matching numerical and experimental modal frequencies within the accuracy of ±10%.The main motivation behind the work is to go for a complete FEA of HVAC casing rather than empirical formulas and iterative procedures. The results obtained by both the methods are found to be satisfactory.


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  • Accession Number: 01853355
  • Record Type: Publication
  • Source Agency: SAE International
  • Report/Paper Numbers: 2022-01-0316
  • Files: TRIS, SAE
  • Created Date: Jul 29 2022 9:17AM