So In this paper, it is mainly studied how to diagnose the fault in working process by means of torsional vibration of crankshaft combining with BP NN, Which belongs to The Second Diagnosis Class.
为此，本文研究如何利用神经网络诊断内燃机具体工作过程故障，属难度较大的二级诊断。
2
The NNE fault system is mainly controlled by tension-torsional stress, and the NNE-NE fault system by these factors: boundary condition, sedimentary facies zone and regional tensional stress.