Dynamic characteristics of a new coupled planetary transmission under unsteady conditions
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(2020) 42:280
TECHNICAL PAPER
Dynamic characteristics of a new coupled planetary transmission under unsteady conditions Xiaoding Shi1 · Dongye Sun1 · Yingzhe Kan1 · Jin Zhou1 · Yong You1 Received: 25 September 2019 / Accepted: 23 April 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract In this paper, a new transmission form of a planetary gear transmission coupled with a torsional vibration damper (PGT-D) is proposed where the torsional vibration damper is used to replace the conventional manner a certain member in planetary gear fixed with a box. The advantages of the PGT-D are investigated under complex conditions including start-up, load saltation, and load fluctuations. A dynamic model of the motor and PGT-D connection was established. The dynamic model combines a dynamic asynchronous motor model and a PGT-D model for a variable speed process, wherein the motor electromagnetic characteristics, PGT-D torsional deformation, and time-varying meshing stiffness under variable speed conditions are considered. Then, the simulation results are compared to those of a traditional motor and planetary gear transmission. The torsional vibration damper can reduce resonance points of the system in the common speed range. The PGT-D can effectively reduce the fluctuation level of motor speed and output acceleration, so that the speed of the system can rise smoothly while reducing the amplitude of torque fluctuation on the shaft during the start-up process. Moreover, the influence of time-varying stiffness on the system is analyzed during the load saltation process. Furthermore, the PGT-D can reduce the interference of the fluctuating load on the motor and gear parts. Keywords Dynamics · Planetary gear · Torsional vibration damper · Unsteady conditions
1 Introduction The torsional vibration damper can improve the performance of a transmission system under complicated working conditions because of its buffering and damping effects [1, 2]. Planetary gear systems are widely used in many fields such as automobiles, wind turbines, coal mining machines, and helicopters because of their large single-speed ratio, compact structure, and strong carrying capacity [3, 4]. Particularly in electric vehicles, the motor and planetary gear transmission are the main power transmission parts. The drivetrain is often subjected to excitations from the motor, road surface, and gear system [5, 6], which are the main causes of torque fluctuation and torsional vibration of the electromechanical system. The smoothness and stability of the transmission Technical Editor: Thiago Ritto. * Dongye Sun [email protected] 1
State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
are important indicators of the drivetrain. Therefore, it is particularly important to improve the dynamic characteristics of the motor and planetary transmission system under complex conditions. Reducing torque fluctuations and torsional vibrations is among the main purposes of research on power train dynamics
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