中文说明：
为了直接对内燃机振动谱图像进行诊断识别，提出一种基于改进变分模态分解（VMD）、伪魏格纳时频分析（PWVD）与局部非负矩阵分解（LNMF）的内燃机振动谱图像识别诊断方法。
English Description：
In order to directly diagnose and recognize the vibration spectrum image of internal combustion engine, a new method based on improved variational mode decomposition (VMD), pseudo Wigner time-frequency analysis (PWVD) and local nonnegative matrix decomposition (LNMF) is proposed