Radial rotation error prediction method for static air pressure main shaft
An aerostatic spindle and rotation error technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the influence of spindle vibration and the impact on bearing dynamic characteristics, and achieve the effect of optimal design and error control
Active Publication Date: 2018-07-17
BEIJING UNIV OF TECH
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Abstract
Provided is a radial rotation error prediction method for a static air pressure main shaft. The method conducts prediction in consideration of micro-scale effects of air film flow in a static air pressure bearing and nonlinear dynamic characteristics. According to the structure and a principle of the static air pressure bearing, flow factors embodying the micro-scale effects are introduced to establish a mathematical model of the air film flow of the static air pressure radial bearing under micro-scale; an air film is transformed into a spring damping system with two freedom degrees perpendicular to each other, the flow model is calculated, and nonlinear dynamic stiffness and damping coefficients are assigned to the spring damping system under the micro-scale; according to the structure and working principle of the static air pressure main shaft, a bearing-rotor system model composed of the air film and a rotor is established; based on the characteristics of main shaft vibration, a mathematical model of dynamic vibration of the bearing-rotor system is established; various vibration errors of the static air pressure main shaft are obtained, and total radial rotation errors of the main shaft are obtained by integrating the various errors.
Application Domain
Design optimisation/simulationSpecial data processing applications
Technology Topic
Damping factorNon linearity +13
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