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Volume : III, Issue : IV, May - 2013 DESIGN AND THEORITICAL VALIDATION OF DOUBLE WALL INSULATED ANECHOIC CHAMBER FOR NOISE EVALUATION V VENKATESHWAR REDDY, SHASHI KIRAN K AND M NAVEEN Published By : Laxmi Book Publication Abstract : Many mechanical devices employ mechanical sensors which, by their nature rattle under
moderate vibration loading. These sensors must be free to move however they must also be
properly constrained in order to minimize rattle and its associated annoyance. Generally this is
the case in all the seatbelt Retractors which generates noise under vibration loading. As
quietness in the vehicle is required from the view point of enhanced comfort and customers
increasingly perceive Squeak & Rattle as direct indicators of vehicle build quality and durability
noise from the retractor need to be dramatically reduced. Noise testing is to be done for all the
mechanical devices to obtain NC rating for particular device. In order to conduct Noise
evaluation a perfect noise absorbing chamber is to be designed i.e. anechoic chamber. This
anechoic chamber design includes understanding the need of anechoic chamber, Test
preparation, Test setup, Analysis of untreated chamber, Applying cone treatment, Analysis of
cone treatment and comparing the results of Sound absorption for untreated chamber and
treated chamber. All the surfaces in the chamber except floor and window will be treated with
the tetrahedral acoustic cones made of foam material. In the view of reverberation acoustic
treatment is given for the room with the dimensions of 50 50 70 and able to reduce the
sound pressure level from 66dB to 57.7dB (-8.3dB). In order to eliminate the outdoor noise a
double wall insulated model is suggested. Keywords : Article : Cite This Article : V VENKATESHWAR REDDY, SHASHI KIRAN K AND M NAVEEN, (2013). DESIGN AND THEORITICAL VALIDATION OF DOUBLE WALL INSULATED ANECHOIC CHAMBER FOR NOISE EVALUATION. Indian Streams Research Journal, Vol. III, Issue. IV, http://oldisrj.lbp.world/UploadedData/2396.pdf References : - I. I.T. Roorkee, "Fundamentals of vibrations, [Accessed August 2012].
- V. Industries, "Valeo cars and Safety," 2008. http://www.valeo.com/fileadmin/dotcom/uploads/publications_files/200809/white%20 paper%20safety%20Eng.pdf. [Accessed October 2012].
- Autoliv, "Autoliv," Autoliv http://www.autoliv.com. [Accessed August 2012].
- B. P. Naganarayana, "Comparitive evaluation of seatbelt Retractor rattle Noise".
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