Calculation study of influence of gaps in an electric vehicle drive on dynamic processes in a transmission at the start of driving

Introduction (problem statement and relevance). Operation of an electric vehicle transmission in such driving modes as acceleration with speeding-up and braking with recuperation of energy leads to a sign-variable change in the driving torque and necessitates consideration of gaps affecting characteristics of torque and angular velocity fluctuations. Present-day computer simulation programs allow to increase the accuracy of calculations through consideration of gaps in a transmission with precise geometrical dimensions and parameters. The relevance of the study is determined by simulation result accuracy increase.
The purpose of the study is to assess gaps arrangement and dimensions influence on drive power and kinematic performance variation.
Methodology and research methods. The study uses computer simulation and virtual test methods.
Results. A transmission dynamic model has been developed with consideration of gaps localization and dimensions. The study was performed in two stages: at the first stage, influence of gap localization on the fluctuation parameters was studied, at the second stage, influence of the specified gap dimension was studied. It was found that gap localization on the output shaft raises the fluctuation range up to 10 times for the drive torque, and up to 4.5 times for the angular velocity. The output shaft gap increase leads to an increase in the fluctuation range by 50% for the torque and by 30% for the angular velocity.
Scientific novelty of the study consists in development of a new dynamic model of a passenger vehicle transmission allowing estimation of a degree of gap localization and dimensions influence on dynamic characteristics.
Practical significance consists in the results of the calculation study, which will be used in development of electric drive active control with precise torque input adjustment.

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