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Investigation of Novel Acoustic Barrier Concepts Phase I: Concept Development and Preliminary Evaluation. Final rept.
| 题名： | Investigation of Novel Acoustic Barrier Concepts Phase I: Concept Development and Preliminary Evaluation. Final rept. |
| 作者： | Mongeau-L.; Bolton-J.S.; Suh-S. |
| 关键词： | *Barriers-; *Traffic-noise; *Noise-pollution-control.;Performance-evaluation; Noise-reduction; Boundary-element-method; Sound-propagation; Acoustic-measurement; Pavements-; Highway-transportation; Environmental-factors; Optimization-; Sound-absorbing-materials; Implementation-. |
| 摘要： | In a previous research project (SPR 2418; 'Study of the performance of acoustic barriers for Indiana toll roads,') the influence of environmental factors, and of advanced sound barrier concepts was investigated. The presence of temperature gradients over pavements was found to have a strong influence on sound propagation. Refraction of sound waves emitted by tire-road interactions in the vicinity of the ground also affects sound barrier performance. Modified ray tracing model suggested that prevailing winds have an influence on barrier performance at large distances. Randomized edge congurations were found not to improve barrier performance for traffic noise. Random edges simply scatter sound energy without any net noise reduction. Although the edge can be optimized for specific frequency components and locations, it appears that optimization for broadband noise control is difficult. The study also suggested that adding sound absorptive material along the barrier edge could enhance barrier performance. |
| 报告类型： | 科技报告 |
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