When the distance between the barrier and the sound source is relatively close,the scale of the sound source has a great influence on the calculation result of the insertion loss.The accuracy can be improved by subdividing the sound source into multiple sub sources,but the calculation process will be complicated.Taking the line sound source close to the barrier as the research object,the sound source is divided into two parts by using the extension line from the receiving point to the top of the barrier,and a correction formula for the insertion loss of the dynamic division of the sound source is proposed.The calculation method of the insertion loss is optimized from the perspective of the effect of the barrier on different regions of the noise source.Compared with the calculation results of equivalent sound source as a single line sound source and divided into multiple sub line sound sources,the calculation results of the optimization algorithm are similar to the calculation results of dividing the sound source into infinite sub line sound sources,but the computational complexity does not significantly increase.It not only solves the problem of insertion loss mutation at the edge of the shadow area,but also improves the accuracy of insertion loss calculation,which is of great significance to improve the accuracy of noise prediction,design suitable barrier structure,and put forward economic and effective noise protection measures.
维普
万方数据