Aiming at the problems of insufficient research on the vibration characteristics of the dual planetary speed-increasing gearbox for high-speed turbine starters
complex internal excitations in the dual planetary gear structure
unclear contribution mechanism of the gearbox vibration
and ambiguous laws of dynamic response peaks and resonance under extreme high-speed operating conditions
taking the dual-planetary speed-increasing gearbox used in the rotor strength test of a high-speed turbine starter as the research object
its vibration characteristics were analyzed.
Methods
2
Firstly
a rigid-flexible coupling dynamic model of the transmission system
including a flexible housing
was established using simulation software. Secondly
a modal analysis of the system was conducted to obtain the first 15 natural frequencies and modal shapes
and the resonance risk under operating speeds was assessed using a Campbell diagram. Finally
the dynamic transmission error
dynamic contact load
and housing surface vibration acceleration of the system were analyzed.
Results
2
The research results indicate that the speed-increasing gearbox effectively avoids resonance zones under both operating and maximum speeds. The dynamic transmission error and dynamic contact load exhibit peak values within the input shaft speed range of 12 000-13 500 r/min
with the most significant vibration observed in the
Y
-direction of the housing. The accuracy of the simulation model is validated through vibration tests
with the relative error between test and simulation results being within 5%. This demonstrates that the developed model can effectively predict the vibration behavior of the system
providing a basis and pract
ical reference for the dynamic design and optimization of similar high-speed planetary gearboxes.
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