1前言城市轨道交通是一种安全舒适、准时快捷、大运量的交通工具,对解决城市人口密度大、交通需求突出、城市环境污染严重等问题,具有无可比拟的优越性。但其噪声问题在一定程度上影响城铁周边居民的生活质量,引起了社会各阶层的关注。北京目前已经运行4条线路,1号线、2号环线 1 Introduction Urban rail transit is a safe, comfortable, punctual and efficient transportation service. It has unparalleled advantages in solving the problems of large urban population density, prominent traffic demand and serious urban environmental pollution. However, the noise problem affects the quality of life of residents living in suburban railways to a certain extent, and has aroused the concern of all walks of life. Beijing has already run 4 lines, Line 1 and Line 2 at present