Abstract
Aiming at the problem of low stiffness of aerostatic bearing, according to the principle of gas-solid coupling, this paper designs a kind of aerostatic thrust bearing with elastic equalizing pressure groove (EEPG) and investigates the effect of elastic equalizing pressure groove (EEPG) on the stiffness of aerostatic bearing. According to the physical model of the bearing, one deduces the deformation control equation of the elastic equalizing pressure groove and the control equation of gas lubrication, using finite difference method to derive the control equations and coupling calculation. The bearing capacity and stiffness of aerostatic bearing with EEPG in different gas film clearance are obtained. The calculation results show that the stiffness increased by 59%. The results of numerical calculation and experimental results have good consistency, proving the gas-solid coupling method can improve the bearing stiffness.
Highlights
Aerostatic bearings are widely used in the field of high speed and high accuracy due to their good performance [1, 2]
The deformation curves of the elastic equalizing pressure groove (EEPG) and the film pressure distribution of the aerostatic bearing are obtained under different gas film clearance, as shown in Figure 6, where (i) is the elastic pressure groove coupling deformation graph and (ii) is the gas film pressure distribution
In order to compare the performance of the aerostatic bearing with EEPG, this paper calculated the performance of aerostatic bearing with REPG in the same performance parameters
Summary
Aerostatic bearings are widely used in the field of high speed and high accuracy due to their good performance [1, 2]. Nishio et al [6] studied the effect of orifice diameter less than 0.05 mm on the performance of aerostatic thrust bearings. This work was done in some studies [10,11,12] Another way is through the electric or pneumatic precision electronic components to control the throttle effect of aerostatic bearings, in order to obtain high stiffness [13]. Aguirre et al study [14] is driven by an electromagnetic drive mechanism to control the gas film clearance changes, so as to improve the bearing stiffness. The gas-solid coupling method is proposed to enhance the stiffness of aerostatic bearing with EEPG, and the gas film clearance can be changed dynamically through the deformation of EEPG. The numerical simulation and experimental results show that the EEPG can improve the stiffness of aerostatic bearing
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