Aerostatic bearings design and analysis with the application to precision engineering: State-of-the-art and future perspectives

Effects of manufacturing errors on the static characteristics of aerostatic journal bearings with porous restrictor

High-speed aerostatic spindles are essential for ultra-precision micro-milling machine tools. The distinguishing functional characteristics of the spindle system are achieved through innovative des...

Multiphysics-based design and analysis of the high-speed aerostatic spindle with application to micro-milling

Numerical analysis and experimental investigation into the effects of manufacturing errors on the running accuracy of the aerostatic porous spindle

Aerostatic bearings are the critical parts of ultra-high speed spindles applied to precision milling, grinding, and other precision engineering applications. In this paper, the computational design...

https://journals.sagepub.com/doi/pdf/10.1177/0954406216639344

Computational design and analysis of aerostatic journal bearings with application to ultra-high speed spindles:

The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article An aerostatic spindle is optimized to elaborate the design procedure of the proposed method In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle Finally, optimal design parameters are acquired and experimentally verified This research guides the optimal design of aerostatic spindles considering the FSI effect

A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect

High speed aerostatic spindles operating at a speed up to 200,000 r/min are a complex product with a multi-physics nature resulted from embedded mechanical-thermal-fluidic-electromagnetic fields. It is much needed to have a comprehensive analysis on the multi-physic interactions within a high speed aerostatic spindle, which is essential for design of the spindles working at much higher speeds and accuracy in various increasingly stringent engineering conditions. This paper presents a multi-physics integrated modelling approach for design and analysis of the high speed aerostatic spindle, including thermal, electromagnetic, mechanical and fluidic analysis models. The heat source, heat transfer mechanism and heat sinks of the spindle system are comprehensively investigated. Furthermore, air film pressure distribution is studied to lead to optimal design and analysis of loading capacity and stiffness of the aerostatic bearings. The multi-physics modelling is implemented using the CFD-FEA integrated approach and validated experimentally. It is shown that the multi-physics integrated modelling is able to simulate the performance characteristics of the spindle system accurately.Copyright © 2014 by ASME

Siyu Gao

Papers

A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect

Multi-Physics Simulation Based Design and Analysis of a High Speed Aerostatic Spindle and its Performance Assessment