W_k与Z计权曲线对铁路环境振动测试结果的影响分析  

Analysis of the effects of the vertical frequency weighting curves of Wkand Z on the railway environmental vibration measuring

作　　者：张光明[1] 贺玉龙[1] 杨立中[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031

出　　处：《安全与环境学报》2014年第6期272-275,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41272322);中央高校基本科研业务费专项资金项目(SWJTU12CX003);教育部新世纪优秀人才支持计划项目(NCET-11-0710)

摘　　要：我国拟颁布的最新《环境振动标准》与现行《城市区域环境振动标准》分别采用不同的频率计权曲线,新标准采用的Wk计权曲线相对于现行标准的Z计权曲线降低了1~4 Hz范围振动的影响权重,提高了5~80 Hz振动的影响权重。结合不同测点的振动频谱,分析了2条计权曲线对振动测试结果的影响。结果表明,Wk与Z计权曲线对振动结果的影响主要受测点振动能量分布的控制,若测点振动能量主要集中在5~80 Hz内,则Wk计权Z振级大于Z计权Z振级;若振动能量在1~80 Hz内分布比较均匀,则2条计权曲线对振动结果影响较小。对铁路环境振动,若新标准采用与原标准相同的昼夜振动限值,则近场新标准限值比原标准更严苛,但远场新标准的限值可能不会更严苛,反而可能更宽松。The paper is aimed to present our analysis of the effects of the vertical frequency weighting curves of Wk and Z on the vibration measuring results of the railway environment. The newly published standard of the railway environmental vibration and the current one of vibration in the urban environment have thus seemed to adopt different frequency weighing curves. Therefore, comparing the vertical frequency weighting Z according to the current standard with the frequency weighting Wk to be adopted in the new standard, the new standard has reduced the effect weight of vibration in 1 - 4 Hz, and there would in turn appear an increase of vibration in 5 - 80 Hz. In order to study the effect of Wk and Z frequency weighting curves on the vibration measuring results, we measured the vibration data of the said four sites in the Chengdu-Dujiangyan fast railway line. And, since one of the four measuring sites is located in the indoor ground 60 m away from the main railway line, whereas the other three are situated in the outdoor ground near the railway embankment, the distances from the said three measuring sites to the railway embankment would be 10 m, 25 m, 50 m, respectively. In that case, if the vi- bration data were used for calculating the Z vibration level, the measuring results tend to be affected by Wk and Z weighting factors. Seeing the above said differences, when analyzing the vibration frequency in each measuring point, it can be found that Wk and Z fre- quency weighting curves tend to affect the vibration measuring results in a measuring point dependent on its own vibration energy distribution. If the vibration energy in the measuring point is focused within 5 -80 Hz, the Z vibration level weighted by Wk would naturally be greater than the Z vibration level weighted by Z weighting factor. Besides, if the vibration energy sizes distribute more evenly in 1 - 80 Hz, the two frequency weighting curves of Wk and Z would be subject to a minor effect on the Z vibration level. In that case, for the same railway environ

关 键 词：环境工程学 铁路环境振动 振动标准 频率计权曲线 Z振级 

分 类 号：X593[环境科学与工程—环境工程]