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access icon openaccess Influence of liquid film thickness on bearing characteristics of magnetic-liquid suspension guide-way

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 02/10/2018, Accepted 12/10/2018, Published 22/10/2018

The magnetic-liquid suspension guide-way (MLSG) adopts the double support form of permanent magnetic suspension and hydrostatic pressure. It can greatly enhance the bearing capacity and rigidity of the guide-way system. The liquid film thickness is the main influencing factor on both the bearing capacity of the hydrostatic system and the permanent magnetic force. This paper analysed the effect of liquid film thickness on the static, dynamic and vibration index of MLSG. Firstly, this paper introduced the structural characteristics and supporting mechanism of MLSG. Secondly, based on flow equation, the static pressure equation, the permanent magnetic force equation and the force balance equation, the transfer function of single DOF supporting system of MLSG in constant flow supply mode is presented, and analysed the influence of the thickness of liquid film on single DOF supporting performance of MLSG. The results show that with the increase of the thickness of the liquid film, the bearing capacity of guide-way, the static stiffness, the dynamic stiffness and the natural frequency decrease, and the adjust time, the total power loss, the amplitude amplification coefficient increases, the phase margin is almost unchanged. The study can provide a theoretical basis for the design of MLGS in engineering practice.

Inspec keywords: hydrostatics; elasticity; liquid films; machine bearings; magnetic fluids; vibrations; computerised numerical control; permanent magnets; machine tools; mechanical stability; suspensions (mechanical components); design engineering; magnetic forces

Other keywords: static pressure equation; static stiffness; permanent magnetic suspension; structural characteristics; supporting system; bearing characteristics; vibration characteristics; force balance equation; permanent magnetic force equation; liquid film thickness; vibration index; bearing capacity; supporting mechanism; single DOF supporting performance; dynamic stiffness; guide-way system; hydrostatic system; MLSG; dynamic index; heavy duty CNC machine tool; magnetic-liquid suspension guide-way; double support form; main influencing factor; static index

Subjects: Mechanical components; Machining; Control technology and theory (production); Buckling and instability (mechanical engineering); Elasticity (mechanical engineering); Production equipment; Vibrations and shock waves (mechanical engineering); Control applications in machining processes and machine tools; Fluid mechanics and aerodynamics (mechanical engineering)

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