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Rattle noise source prediction for instrument panel of a car using hybrid sea-fem analysis

Beigmoradi, S ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. Publisher: International Institute of Acoustics and Vibrations , 2013
  3. Abstract:
  4. Squeak and rattle (S&R) noises are important in-cabin sources of annoyance for occupants. Originally, S&R is generated as a result of colliding and slamming of car's trim and body structure which in turn occurs because of the dynamic displacements of components excited by road and power-train. Squeak noise is interpreted as periodic stick and slip phenomena in the contact boundary of two neighbor surfaces. While rattle noise is the emitted noise when adjacent surfaces collide and impact. Squeak noise takes place at low frequency while rattle phenomenon happens in high-frequency range, even though the excitation sources (road and power-train line) works in low frequency range. In practice, squeak and rattle noise can be minimized via controlling the gaps through a tolerance analysis, as well as the appropriate choice of materials and design. In this research, potential S&R sources are investigated for the instrument panel of a car using clearance analysis. Impact statistics and overall force level at potential rattle places are calculated through random vibration excitation analyses and afterwards, acoustic sensitivity, overall acoustic response and loudness are calculated by the aim of hybrid SEA-FE method. The results of this prediction will be used in noise and vibration control plan of the whole car in design phase
  5. Keywords:
  6. Fits and tolerances ; Roads and streets ; Acoustic response ; Acoustic sensitivity ; Adjacent surfaces ; Dynamic displacements ; Excitation sources ; Low frequency range ; Noise and vibration ; Tolerance analysis ; Acoustic noise
  7. Source: 20th International Congress on Sound and Vibration 2013, ICSV 2013 ; Volume 4 , July , 2013 , Pages 2883-2890
  8. URL: http://www.proceedings.com/19660.html