【摘要】 基于多通道阵列式声源识别系统和多通道噪声振动实时采集分析系统,对京津城际和京沪高速铁路列车运行状态下的噪声源、空间声场分布以及声屏障降噪效果进行测试和分析。将高速列车声源等效为下部噪声和上部噪声两部分:下部噪声以轮轨噪声和车体气动噪声为主,其声源等效位置确定为轨面以上0.6m处;上部噪声以弓网噪声为主,其声源等效位置确定为轨面以上3.3m处。由此提出基于双声源作为等效声源和以1250Hz作为等效频率的高速铁路声屏障声学计算模式,给出声屏障插入损失和加长量修正计算公式,所得到声屏障的声学计算结果与实测结果吻合。更多还原

【Abstract】 Based on multi-channel aligned array sound source identification syste m and multi-channel noise vibration real-time acquisition analysis system,the n oise source,the distribution of spatial sound field and the reduction effect of noise barrier were tested and analyzed under train operation state for BeijingTianjin intercity and Jing-Hu high-speed railway.The sound source of high-sp eed train is equivalent to lower part noise and upper part noise.The noise of lowe r part mainly includes wheel rail noise and the aerodynamic noise of car body,a nd its sound source is equivalent to 0.6 m above rail surface.The noise of upp e r part is mainly pantograph-catenary noise,and its sound source is equivalent t o 3.3 m above rail surface.Therefore,the acoustic computing model for the noi s e barrier of high-speed railway is proposed,which is based on dual sound sourc e as the equivalent sound source and 1 250 Hz as the equivalent frequency.The co r rection and calculation formula for the insertion loss and extension part of noi se barrier is given.The obtained acoustic computing result of sound barrier agr ees well with the measured result.更多还原