Dynamic Simulation Of Hydrodynamic Compound Planetary Gear Drive

Due to changes in the process condition of industrial production, It is nesscearyto take a control on the speed of high-speed driving equipment such as pumps andfans. Hydrodynamic compound planetary gear drive device, based on the principleof superimposition and power splitting, can drive large units as pumps, fans andcompressors, which is efficient, stable and reliable.therefore, It is significant toresearch and design on high-power and high-speed hydrodynamic planetary gearunit that can promote energy conservation of energy-intensive industries and ensuresafe and stable operation of large equipment, In this thesis, we simulate and analysisthe dynamic characteristics of the transmission device for providing some referencefor the design and optimization with the help of multi-body dynamic simulationsoftware SIMPACK.This thesis deduces the motion equations of multi-body and multi-flexible bodyin multi-body system, then we introduce the theory and algorithm of motionequations in SIMPACK and three discrete method of flexible bodies briefly, In thelast we have a detailed presentation on the theory that involved in FEMBS interfacefor SIMPACK.According to the structural characteristics of hydrodynamic compoundplanetary gear drive, we decompose the drive system into multi-body dynamicsfacto. The mainshaft is treated as flexible body, while the other parts as rigid body,according to the topology diagram, we establish the rigid-flexible coupling dynamicsimulation model for hydrodynamic planetary gear in SIMPACK and simulate whenthe torque converter in traction condition and braking condition. and then, weanalysis the dynamic tooth force, Journal bearing lube oil pressure and filmthickness, and vibration of the mainshaft, We find that the meshing force of fixedplanetary gear changes greatly, while the meshing force of revolving planetary gearchanges very little thanks to dual floating structure, due to the vibration anddeformation of the flexible shaft, the film thickness and pressure distribution of twojournal bearing changed greatly, and because of small radial vibration, their filmthickness and pressure distribution of the journal bearing on rotating planetary gearchanges very little. The places of shaft where pump wheel, the hub of the ring gear,planet carrier support mount on, is in the maximum vibration amplitude. Finally, weperforme a modal analysis on the drive system and get the lateral naturalfrequencies.