中文摘要：

针对汽车尾气排放的非线性、时变性问题,提出一种三维谱特征下的汽车尾气评估方法。该方法利用频谱分析的原理对汽车尾气进行时频转换,得到尾气的三维谱特征。这些三维谱特征作为输入被提交给径向基神经网络,在K均值聚类算法的驱动下,径向基神经网络完成训练与测试,实现对三维谱特征的分类,从而评估相应的汽车尾气排放水平。数值实验结果表明,提出的汽车尾气评估方法具有较高的准确性。

英文摘要：

We present an assessment method of automobile exhaust using three-dimensional spectrogram features to solve the nonlinear and time-varying problems of automobile exhaust emissions.The method takes advantage of spectral analysis to obtain the three-dimensional spectrogram features of automobile exhaust.These three-dimensional spectrogram features,being considered as the input variables,are fed to radial basis function neural network（RBFNN）adapting the K-means algorithm.After completing the training of RBFNN,the three-dimensional spectrograms,being unseen by the network before,are fed to the well-trained network for testing,which achieves the assessment level of automobile exhaust via the classification of three-dimensional spectrogram features.The numerical experiments indicate that the proposed method has a high accuracy.