Hybrid Power System Shafting Vibration Characteristic

Finite element model of diesel engine shafting and motor shafting were established. With finite element calculation, the first 5 order modal frequency and vibration shape of diesel engine shafting and motor shafting were obtained. Based on diesel engine shafting model and motor shafting model, hybrid power system shafting finite element model was established, and the first 10 order modal frequency and vibration shape were obtained. Calculation results show that every modal frequency of hybrid power system shafting is declined compared with ordinary power system. Reason for the decline is motor shafting modal frequency is significantly less than diesel engine shafting. The 1 order vibration shape of hybrid power system shafting is torsion vibration. Hybrid power system shafting vibration experiment table was established and shafting vibration testing were carried out. Torsion vibration experiment results show that f₀ and 2f₀ are two peak frequency of shafting torsion vibration frequency spectrum, shafting peak frequency is less than shafting 1 order modal frequency 212 Hz and shafting torsion resonance can be avoided. Bending vibration experiment results show that bending vibration energy is focuses in x direction and y direction. Hybrid power system axial vibration can be ignored.