Evaluation Of Interior Sound Quality Of Hybrid Vehicle

In the face of the domestic and overseas rigorous vibration and noise standards of vehicle industry and the continuous improvement of consumers’ demand for vehicle comfort,HEV has become the trend of the new energy vehicles, it also reflects some advantages in the overall vibration and noise control gradually.but the increasement of noise source and the change of the structural characteristics,the phenomenon of transient shocking vibration and harsh noise causing by frequent switching of a variety of power supply is so prominent,the influence of this phenomenon for the interior sound quality characteristics and crew’s subjective feeling is very great.Although the overall interior noise level of HEV has been reduced,but in terms of the passengers’ subjective feeling,there’s no much improvement in the passengers’ riding comfort.So this article follows the interior sound quality evaluation research about the different driving mode,the interior different locations and different speed:1. Research on subjective evaluation:To study the distribution of HEV interior noise、the vehicle speed correlation and the influence of different driving modes, collecting the noise samples when the vehicle is on the satble and unstable condiction. then playbacking the signals、 montaging and doing loudness adaption to them and so on; using paired comparison method to conduct on the subjective evaluation experiment. Additional,in order to study the contribution of different band noise to the overall band sound quality,this article carries out frequency division of samples by using the filters in ArtemiS 12.0.it was divided into 4 parts,and the subjective evaluation test is divided into five times.2. Research on objective evaluation:This article introduces in detail physical acoustics,psychoacoustics and language aspects of the objective parameters,this article selects eight kinds of commonly used objective parameters,and carries out the calculation and analyse of the stable and unstable datas by using ArtemiS 12.0,Finally,Conducting on the related study on objective parameter changes of unsteady condition.3. Research on stable sound quality evaluation model:Aiming at the stable noise samples of HEV,this article establishs three different types of evaluation models:The traditional multiple linear regression sound quality subjective and objective evaluation model、the BP neural network sound quality subjective and objective evaluation model mapping nonlinear relationship and the GA-BP neural network sound quality subjective and objective evaluation model,Finally,comparing and analysing three predicted effect of the forecasting models.4. Research on unstable sound quality evaluation:Aiming at the unstable noise evaluation job,this article carries out the prediction which is based onpsychoacoustics objective parameter(sharp degree and loudness) and the critical frequency band analytic wavelet decomposition of the BP neural network.