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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.

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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 :

  1. I. I.T. Roorkee, "Fundamentals of vibrations, [Accessed August 2012].
  2. 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].
  3. Autoliv, "Autoliv," Autoliv http://www.autoliv.com. [Accessed August 2012].
  4. B. P. Naganarayana, "Comparitive evaluation of seatbelt Retractor rattle Noise".

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