Research on State-dependent Dynamic Characteristics of H-type Dual Drive Feed System Based on Electro-mechanical and Rigid-flexible Coupling

doi:10.3901/JME.2023.03.098

Abstract

Abstract: Dynamic characteristic is the key factor affecting the positioning accuracy of H-type dual drive feed system (HTDDFS). When the position states change, the HTDDFS, based on the drive center at gravity (DCG) principle, cannot guarantee that the resultant force of the dual axis driving forces can pass through the center of gravity of the moving frame, resulting in the dynamic error of the system, so it is still difficult to improve the positioning accuracy of the HTDDFS. Based on the analysis of the structural characteristics of the HTDDFS, the influence of position states of H-type crossbeam and spindle moving parts on the dynamic parameters of the system are considered, and then the rigid flexible coupling dynamic model of the HTDDFS is established. Combined with the control model of the servo motor, the electro-mechanical and rigid-flexible hybrid model of the HTDDFS is obtained by using the state space method. The correctness of the established dynamic model is verified by modal experiment. Through numerical simulation, the response characteristics of the system to step signal, S-shaped signal and slope signal are analyzed, and the influence of position states, feedrate states and synchronization control strategies on the dynamic error, tracking error and synchronization error of the HTDDFS are obtained. The electro-mechanical rigid-flexible hybrid model can effectively reveal the influence of state-dependent parameters of the HTDDFS on the positioning accuracy of the system, and lay a theoretical foundation for the research of synchronous control and error compensation of the HTDDFS.

Key words: H-type dual drive feed system, electro-mechanical and rigid-flexible coupling, state-dependent parameters, synchronization control strategy, dynamic characteristics

CLC Number:

TG659

LIU Qi, LU Hong, ZHANG Xinbao, DAI Jiashun. Research on State-dependent Dynamic Characteristics of H-type Dual Drive Feed System Based on Electro-mechanical and Rigid-flexible Coupling[J]. Journal of Mechanical Engineering, 2023, 59(3): 98-109.

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