Abstract
Multi-clearance is the main cause for the performance and reliability decline of complicated mechanical systems. The increased clearance could induce contacts and impacts in joints, and consequently affect control accuracy. A nonlinear dynamic model of planetary gears with multi-clearance coupling is proposed in the current study to investigate the mechanism of influence of clearance on the dynamic performance. In addition, the coupling relationship between radial clearance and backlash is integrated into the multi-body system dynamics. The vibration characteristics of planetary gears with the changes of rotational velocity, clearance size and inertia load are explored. The numerical simulation results show that there are complex coupling relations in planetary gear systems, due to the multi-clearance coupling. The phenomenon of system resonance may occur with the changes of rotational velocities and clearances’ sizes. Multi-clearance coupling can significantly increase the resonant response of planetary gear systems in empty-load or light-load states.
Highlights
With the increasing requirements for the performance of space mechanisms, the transmission joints, as the core components, have become the focus of attention
The radial and torsional acceleration curves of planetary gear train are obtained by simulation, and the corresponding vibration spectrum is obtained by Fast Fourier Transform (FFT)
According toto the analysis presented inin the previous section, can bebe seen that planet carrier is is According the analysis presented the previous section,it it can seen that planet carrier coupled with the planetary gear vibrations, and the radial and torsional vibration of the planetary coupled with the planetary gear vibrations, and the radial and torsional vibration of the planetary gear itself has a coupled relation
Summary
With the increasing requirements for the performance of space mechanisms, the transmission joints, as the core components, have become the focus of attention. Lumped-parameter and finite element models with bearing clearance, tooth separation, and gear mesh stiffness variation are developed to investigate the nonlinear dynamic behavior of planetary gear systems [20]. To reflect the nonlinear behavior of the space manipulator’s joint, factors such as backlash clearance, gear tooth profile error, and time-variant meshing stiffness were considered in the modeling process [31]. A refined dynamic model of planetary gear transmission joint is proposed in this paper to analyze the influence of multi-clearance coupling on the vibration characteristics of the system. This paper is organized as follows: Section 2 introduces the establishment process of dynamics model intheplanetary gear drivenofjoint, and obtains the model of single gearand and planetary vibration characteristics the system, and clearance size, rotational velocity load magnitudegear with multi-clearance coupling.
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