摘要
城市轨道交通的高架线路下面通常为公路,对于交通繁忙路段无法按照轨道交通的环境评价准则中规定的测点位置进行长时间的振动测量。为此,以最大Z振级为评价量,研究轨道交通高架段的振动衰减规律,为极端条件下通过替代点测量的源强值修正提供试验数据支撑。首先,提出一种基于计权网络频响函数的最大Z振级计算方法;然后,以南京地铁的高架段线路振动测试数据为例,计算不同距离测点条件下的最大Z振级,以研究高架路段振动衰减规律。
The elevated lines of urban rail transit are usually highways,and the vibration measurement of the busy sections cannot be carried out according to the measurement points specified in the environmental assessment criteria of rail transit for a long time.Therefore,the vibration attenuation of the elevated section of rail transit is studied with the maximum Z-vibration level as the evaluation criterion,which provides test data support for the source intensity correction measured by alternative points under extreme conditions.First,a new method for computing the VLz by weighted acceleration based on the Fast Fourier Transform(FFT)is proposed in this paper.Then,taking the vibration test data of Nanjing Metro elevated section as an example,the maximum Z-vibration level under different distance measurement position is calculated to study the vibration attenuation law of elevated section.
作者
王彧
夏遵平
王彤
Wang Yu;Xia Zunping;Wang Tong(Jiangsu Academy of Environmental Industry and Technology Corp.,Nanjing Jiangsu 210036,China;Institute of Vibration Engineering,Nanjing University of Aeronautics and Astronatics,Nanjing Jiangsu 210016,China)
出处
《山西建筑》
2024年第6期136-139,144,共5页
Shanxi Architecture
关键词
振动衰减
Z振级
振动源强
环境振动
vibration attenuation
Z-Vibration level
frequency response function
environmental vibration
