Dynamic analysis of ball screw feed system with abrupt-change-nonlinear drive stiffness

Abstract

Purpose For ball screw feed system, a sudden start or stop has a great influence on the transmission stiffness, so the axial stiffness mutation of feed system will occur. The purpose of this paper is to study the influence of acceleration on the transmission stiffness and dynamic characteristics of the ball screw feed system. Design/methodology/approach Taking the ball screw feed system as a research object, on the basis of the Hertz contact theory and the mixed element method, axial stiffness model and dynamic model are established. And the system stability was analyzed by the time history diagram and Phase-plane portrait diagram. The feed system was analyzed theoretically and experimentally, the experimental results are in good agreement with the model results. Findings Lead screw lead angle, preload, load and start acceleration affected ball-screw pair, bearing and transmission stiffness. And the load, nut contact stiffness, bearing contact stiffness, preload have a large effect on the transmission stiffness. The results show that a certain acceleration value will make the axial stiffness abrupt change. Originality/value This research provides a useful theoretical support for ensuring a good dynamic for the ball screw feed system.

A review of fault diagnosis, prognosis and health management for aircraft electromechanical actuators

“…Gao et al. [141] found out how load, nut contact stiffness, bearing contact stiffness and preload would affect the ball screw pair's transmission stiffness. Liu et al.…”

“…Xu et al [140] provided the corresponding relationship between the axial force applied on the nut of a ball screw pair and the axial displacement of the nut, with consideration of the preload. Gao et al [141] found out how load, nut contact stiffness, bearing contact stiffness and preload would affect the ball screw pair's transmission stiffness. Liu et al [142] established a nine degrees-of-freedom dynamic model to study the relationship of contact deformation and restoring force of each ball in the ball screw pair.…”