三维谱特征下的汽车尾气评估方法

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。

An assessment method for automobile exhaust based on three-dimensional spectrogram features

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.