论文信息 - Noise barriers in a refracting atmosphere

Noise barriers in a refracting atmosphere

Abstract A model is presented for the insertion loss of a noise barrier in a refracting atmosphere. The model is implemented in a prediction scheme for outdoor sound propagation up to ranges of 15 km. The accuracy of the model is demonstrated by comparison with numerical simulations of sound propagation over a barrier, using the parabolic-equation method (PE method). For downwind propagation over a barrier on absorbing ground, e.g. grassland, the insertion loss is found to decrease with increasing distance behind the barrier. For downwind propagation over a barrier on reflecting ground, however, the insertion loss remains constant. This effect is shown to originate from sound rays with multiple ground reflections. The effect is confirmed quantitatively by PE simulations.

Erik M. Salomons | E. Salomons

[1] Zyun-iti Maekawa,et al. Noise reduction by screens , 1968 .

[2] B. A. Jong,et al. Propagation of sound over grassland and over an earth barrier , 1983 .

[3] E. Salomons. Diffraction by a screen in downwind sound propagation: A parabolic‐equation approach , 1994 .

[4] W. E. Scholes,et al. FIELD PERFORMANCE OF A NOISE BARRIER , 1971 .

[5] Erik M. Salomons,et al. DOWNWIND PROPAGATION OF SOUND IN AN ATMOSPHERE WITH A REALISTIC SOUND-SPEED PROFILE : A SEMIANALYTICAL RAY MODEL , 1994 .

[6] K. Gilbert,et al. Application of the parabolic equation to sound propagation in a refracting atmosphere , 1988 .

[7] K. Attenborough. Acoustical impedance models for outdoor ground surfaces , 1985 .

[8] Eric Stusnick,et al. Scale model studies of the effects of wind on acoustic barrier performance , 1976 .

[9] J. Nicolas,et al. Insertion loss of absorbent barriers on ground , 1989 .

[10] Gilles A. Daigle,et al. Propagation of sound in the presence of gradients and turbulence near the ground , 1986 .

[11] M. West,et al. A tutorial on the parabolic equation (PE) model used for long range sound propagation in the atmosphere , 1992 .

[12] K. Gilbert,et al. Calculation of turbulence effects in an upward refracting atmosphere , 1988 .