Vibro-acoustic behavior of a plane radiator in the case of impact excitation


  • D. Trentin Sherbrooke Univ., Que., Canada
  • F. Laville Sherbrooke Univ., Que., Canada


acoustic noise, acoustic radiators, impact (mechanical), noise abatement, variational techniques, vibrations, vibro-acoustic behaviour, Hertz contact law, plane radiator, impact excitation, impact generated noise, semi-complex structure, plate, point masses, stiffeners, time domain approach, variational approach, frequency domain, impact response, plastic granulator, impact reduction structure, 8 dB


In order to understand and reduce impact generated noise, the acoustic radiation due to the impact of a sphere on a plane, semi-complex structure (plate with general boundaries where point masses and stiffeners can be added) has been modelled. First, the force generated during impact is obtained with a time domain approach because of the nonlinearity of the problem. Second, a variational approach in the frequency domain allows the impact response and sound radiation from the structure to be calculated. A first application case to a plastic granulator is given. The theoretical model enables one to design a special impact reduction structure (thin street metal+elastic layer) and a noise reduction of 8 dB(A) was obtained




How to Cite

Trentin D, Laville F. Vibro-acoustic behavior of a plane radiator in the case of impact excitation. Canadian Acoustics [Internet]. 1991 Sep. 1 [cited 2023 Sep. 21];19(4):31-2. Available from:



Proceedings of the Acoustics Week in Canada