Analysis On The Application Of Traffic Noise Prediction Model At Urban Main Way

As the rapid development of Chinese transportation, and a large number of vehicles maintain growth, urban pollution is becoming increasingly serious, particularly the road noise problem is more prominent. Noise not only brought to the urban residents bodily harm, but also caused the state to a huge economic loss. To resolve, reduce and improve the urban noise, traffic noise in particular, in recent years, is a hot study issue for many scholars. To reduce traffic noise purposefully, then an important prerequisite for the road noise to make accurate forecasts and evaluation, for traffic planning departments and environmental protection departments to provide basis for decision-making.The main body of a book model according to the model is USA FHWA noise, the model train of thought, has built the traffic stream-based noise forecast model being suitable to the Chang Chun City main force road according to this model building. The contrast by the fact that forecast value and reality to the model measure value is discovered, the model has very big error, process having changing the appearance of very greatly to vehicle radiation sound level amendment , road surface levelling degree , isoparametric road surface slope amendment. And a important source of city main force road traffic noise is city public transit vehicle noise , unable simple public transit vehicle noise grouping is large-scale vehicle in forecast model , much public transit vehicle issues ear-piercing braking sound for a short time , no stably, even sometimes since public transit vehicle exercises speed, engine hair rolling sound that public transit lathes when starting, much public transit vehicle pretends to have loudspeaker , these factor, meticulous analysis, and the amendment having been in progress the main body of a book has been carried out.But, that the forecast has one is important issue is right away, home and abroad forecast model background noise be adopt check the decibel addition curve this evidently does not accord with reality. Because of, the express highway is compared with city main force road, city main force road background the noise kind is complicated , sound production source frequency is uneven, noise is not different from traffic situation , diversity without exception identical to the section background , thereupon how noise carries out amendment on background in forecast model is difficult point , the priority being also the main body of a book studying. And then the main body of a book, carry out a curve mediating and build the model, and then the model applying by the fact that noise carries out frequency analysis on the background being unlike section,noise , course reality verify the background choosing different characteristic property section , reach comparatively good effect.In the forecast carrying out traffic noise on city main force road, the condition the main body of a book is returned back having considered the road intersection mouth, has built the cross noise forecasts model such as the mouth alternating , annularity intersection mouth having when the signal matches the time cross intersection mouth , the nothing signal is qualified for respectively , has carried out verification on the model and.On basis being amended in a great quantity having been in progress to forecast model, the result measuring value to model forecast value and reality has carried out contrast, and has analysed the cause producing error.