Journal of Lanzhou University of Technology ›› 2023, Vol. 49 ›› Issue (5): 42-49.

• Mechanical Engineering and Power • Previous Articles     Next Articles

Research on transverse torsional coupling vibration of ball screw based on improved transfer matrix method

WU Qin, LUO Dian-li, YANG Ran-ran   

  1. School of Mechanical and Electrical Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2022-08-25 Online:2023-10-28 Published:2023-11-07

Abstract: The traditional 2~4-order transfer matrix method can only be used to study the single degree of freedom vibration of beam systems. If it is directly applied to the study of beam systems with coupled vibration,a large error will exist in the calculation results of the natural frequencies of the system. In order to solve this problem, the ball screw feed system of the machine tool is taken as the research object in this paper, which is simplified and regarded the ball screw as a flexible beam. Based on considering the moment of inertia and transverse shear deformation of the beam, the traditional 2~4-order transfer matrix method is improved to 6-order by using Timoshenko beam theory. The mechanical and theoretical model of the system is established, and the system state transfer matrix equation including transverse vibration and torsional vibration is obtained. By comparing the simulation results and experimental results of the first two natural frequencies of the system, the accuracy and rationality of the improved transfer matrix method are verified. In addition, the influence of load on the first two natural frequencies of the system and the transverse torsional coupling vibration modes of the ball screw are studied through numerical simulation, and the transverse torsional coupling vibration characteristics of the ball screw are explored.

Key words: ball screw, Timoshenko beam theory, improved transfer matrix method, natural frequency, coupled vibration characteristics

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