小型航空活塞发动机喷油异常的故障诊断

针对小型航空活塞发动机出现的喷油异常故障,基于发动机的缸内压力和缸盖振动信号,采用一种变分模态分解和布谷鸟搜索优化支持向量机相结合的故障诊断方法对发动机喷油异常故障进行诊断。该方法使用变分模态分解对发动机的缸内压力信号和缸盖振动信号进行处理得到本征模态函数,对本征模态函数进行奇异值分解和能量特征提取,将缸内压力和缸盖振动的数据集输入布谷鸟搜索算法优化的支持向量机模型中进行训练和测试。结果表明:该方法较好地识别出发动机喷油异常的故障,其中缸内压力和缸盖振动信号的故障识别分类准确率分别为95.32%和92.47%,验证了该方法的有效性。 

Fault diagnosis of abnormal fuel injection of small aviation piston engine

Considering the abnormal fuel injection failure of small aviation piston engines, based on the engine’s in-cylinder pressure and cylinder head vibration signal, a fault diagnosis method combining variational modal decomposition and cuckoo search optimization support vector machine was used to diagnose abnormal fuel injection failure of the engine. The method used variational mode decomposition to process the in-cylinder pressure signal and cylinder head vibration signal of the engine to obtain an intrinsic mode function, perform singular value decomposition and energy feature extraction on the intrinsic mode function, and the data sets of in-cylinder pressure and cylinder head vibration were input into the support vector machine optimized by the cuckoo search algorithm for training and testing. Results showed that this method can better identify the faults of abnormal fuel injection of the engine, and the accuracy of the fault recognition classification of the pressure in the cylinder and the vibration signal of the cylinder head was 95.32% and 92.47%, respectively, verifying the effectiveness of the method.