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High-stability low-disturbance torque optimum design method of triaxial air bearing table

A high-stability, optimized design technology, applied in the field of simulation, can solve the problems that the air-floating table cannot float, cannot guide the design of air-bearing bearings, and has a great influence on the accuracy of the three-axis air-floating table.

Active Publication Date: 2015-01-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many design parameters of the three-axis air flotation table, such as bearing capacity, disturbance moment, diameter, ball depth, number of orifices and their arrangement, etc. The design process is a complex optimization iterative process, so the three-axis air flotation The accuracy of the platform is greatly affected by the iterative design mentioned above. A bad design not only affects the indicators, but even directly causes the air bearing platform to "fail to float" and cause the mission to fail.
In the paper "Analysis and Compensation of Constant Interference Moment of Three-axis Air Floating Platform" (see "Acta Astronautics", 2009, Volume 30, No. 2, Page 448-452), Xiang Dong et al. The method of calculating the disturbance torque, and deriving the estimation formula of the constant disturbance torque through the compound pendulum cycle formula, but it is all carried out on the air bearing that has been processed, and does not involve the mechanical design of the air bearing, that is to say, it cannot Guide the design of air bearing

Method used

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  • High-stability low-disturbance torque optimum design method of triaxial air bearing table

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Embodiment 1

[0043] combine figure 1 , the optimal design method of the three-axis air bearing table of the present invention, the steps are as follows:

[0044] Step 1: First set the air supply pressure P s , Environmental pressure P a , according to many years of research and development experience, the air supply pressure is recommended not to be too large to avoid complicated air supply equipment; usually P s The initial value is set at 0.4 ~ 0.7MPa to ensure that the bearing capacity can be increased as much as possible and the diameter of the ball can be reduced to create favorable conditions for precision machining without "air hammer";

[0045] Step 2: Given the diameter D of the sphere and the diameter of the orifice d c , the number of restrictors n;

[0046] Step 3: The thickness of the air film of the ball bearing is h, and the initial value is not less than 10 μm.

[0047] Step 4: Calculate the pressure distribution P and the bearing mass flow m by using the vertical proj...

Embodiment 2

[0074] In the optimization design of air-floating ball bearings, usually its load-carrying capacity is appropriately higher than the index requirement, which is usually taken as 110% to 120% of the index value, so as to ensure that the bearing has ample load-carrying capacity.

Embodiment 3

[0076] In the optimization design of the air bearing ball bearing, various technical requirements are considered comprehensively, and the design principle is to adopt the best stiffness design of the air film under the condition of satisfying the carrying capacity.

[0077] In principle, the value of the air film is not less than 10 μm. This medium-level air film thickness not only ensures the performance of the bearing but also reduces the difficulty of processing. Considering the existence of processing errors in spherical bearings: including size errors, shape errors, etc. In the case of force deformation, etc., it can still ensure a complete air film, realize full gas lubrication, and ensure the stability of the air bearing.

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Abstract

The invention provides a high-stability low-disturbance torque optimum design method of a triaxial air bearing table. According to the arrangement, indexes such as loading capacity, air supply pressure, thickness of air film, rigidity of the air film and a throttler of a ball bearing of the triaxial air bearing table are calculated for optimization and iteration, and the final design plan with optimal rigidity of the air film is obtained. In this way, production difficult is decreased in design, with factor of air source fluctuation considered, high stability and low disturbance torque of the system are guaranteed in design, and project realization is facilitated. The optimum design method is suitable to optimization design of a homotaxial air bearing table and is high in precision and stability, low in cost and applicable to engineering application of ground development of various high-precision spacecrafts.

Description

technical field [0001] The invention relates to simulation technology, in particular to an optimal design method for a three-axis air bearing table with high stability and low disturbance moment. Background technique [0002] The three-axis air bearing platform relies on the air film formed between the air bearing and the bearing seat by compressed air to make the simulation platform float, so as to realize the relative motion condition of approximately frictionless, so as to simulate the impact of space vehicles such as satellites in outer space. The mechanical environment with small disturbance torque. As a space vehicle motion simulator, the full physical simulation experiment of the satellite control system on the three-axis air bearing platform can test the performance of the system, which plays an important role in the verification of the aircraft attitude control system, and is an important means and method in the process of space vehicle development. [0003] There ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 夏红伟王常虹马广程李莉庞志成
Owner HARBIN INST OF TECH
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