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Maaliikenteen ahiheuttaman runkomelun arviointi. Esiselvitys. (Assessment of Traffic-Induced Ground-Borne Noise. Preliminary Study)
| 题名： | Maaliikenteen ahiheuttaman runkomelun arviointi. Esiselvitys. (Assessment of Traffic-Induced Ground-Borne Noise. Preliminary Study) |
| 作者： | Talja, A.; Saarinen, A. |
| 关键词： | Traffic noise##Assessments##Low frequency sound##Limit values##Nuisance##Guidelines##Buildings##Measuring methods##Annoying effects##Literature reviews##Criterion##Vibration assessments##Vibration isolation##Finland##Ground-borne noise##Foreign technology##Structure-borne sound##Ground-borne vibration## |
| 摘要： | Traffic-induced ground-borne noise may cause unacceptable nuisance for people living near the traffic lanes. Suitable noise criteria, limit values and guidelines will ensure the adequate protection of existing sensitive land uses. As national noise control regulations in Finland do not deal with ground-borne noise issues there is a need for developing guidelines. Especially the land use and transportation planning need instructions how to take the phenomenon into account. The proposed noise criterion Lprm is related to the measured maximum noise level LpASmax and 95 % confidence interval. The following limit values are proposed for Lprm in tunnels: 30 dB for buildings where people normally sleep, 35 dB for buildings where people need undisturbed working conditions and 2530 dB for buildings where silence is especially needed. For surface transport the limit values may in some cases be 5 dB higher than for underground transport. The limit for ground-borne noise is set at lower level than that for the airborne noise, because using the A-weighted sound level, sounds dominated by low frequency components (like ground-borne noise), are perceived to be louder than broadband sounds that have the same A-weighted level. Preliminary guidelines for vibration assessment are given for land use and transportation planning. Three different design levels are proposed. Level 1 gives precaution distances for making the decision, if more detailed study is needed or not. Level 2 takes into account also the factors on the vibration propagation path. It is based on a base curve for ground vibration as a function of distance from the track. The average vibration of the room surfaces is approximated by adjusting the base curve by factors related to traffic, track, soil and building. Finally the curve for ground-borne noise level is estimated by adjusting the curve by factors, which comprise the dependence of the A-weighted sound level from the vibration level and vibration frequency. Guidelines for design level 3 describe the utilization of noise and vibration measurements in ground-borne noise assessment. The publication describes also the basic solutions and their performance in damping of ground-borne noise. |
| 总页数： | 74 |
| 报告类型： | 科技报告 |
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