Self-balancing iterative identification method of air spring stiffness in air-floating vibration control system

Abstract

The invention discloses an air floating vibration control system air spring stiffness self-balancing iteration identification method. Firstly, gravity load is applied to generate displacement by the aid of estimated stiffness values of air springs in an air floating vibration control system, displacement of air springs in an air floating platform is consistent with deformation of the air springs in a balanced state according to hypothesis, corresponding 'pseudo-stiffness' is obtained on the basis, 'pseudo-stiffness' values are compared with the estimated stiffness values, set discriminating conditions are met if two successive stiffness values are sufficiently approximate, the treatment process is converged and finished, the stiffness of the air springs is outputted as the 'pseudo-stiffness' values, otherwise, the estimated stiffness values of the air springs are modified into the 'pseudo-stiffness' values, and retreatment is performed until the air spring stiffness with the discriminating conditions in the actually balanced state is achieved. By the aid of self-balancing, self-iteration and self-recognition air spring stiffness technology, the stiffness of the air springs can be automatically recognized and calculated according to the set balanced state.

Description

technical field [0001] The invention specifically relates to an air spring stiffness self-balancing iterative identification method of an air-floating vibration control system. Background technique [0002] Air-floating vibration control systems based on air springs have been widely used in micro-vibration control and other fields. The stiffness of air springs can be used to evaluate the vibration isolation performance of air-floating vibration control systems. However, due to the complex mechanical characteristics of air springs, It is difficult to obtain the stiffness of its equilibrium state accurately, effectively and quickly. [0003] At present, the acquisition of air spring stiffness in the air-floating vibration control system mainly relies on numerical methods, that is, through finite element modeling of the vibration isolation system and calculation through loading, but this method has the following defects: [0004] (1) The actual stiffness of the air spring cann...

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Problems solved by technology

[0004] (1) The actual stiffness of the air spring cannot be accurately obtained: the numerical calculation results of this method are quite different from the performance of the air spring in the actual engineering test, and it is difficult to accurately evaluate the vibration isolation characteristics of the air spring such as its natural frequency, which makes it difficult for the simulation results to be true. Guidance to actual projects greatly affects the effective play of the air spring

[0005] (2) It is not conducive to the development of the active vibration control system of the air spring: the active control system based on passive vibration isolation (without active control energy input) needs to know the parameters such as the stiffness and damping of the passive vibration isolation unit accurately in order to design the active controller, but this It is difficult to calculate its stiffness accurately and effectively, which greatly hinders the application and development of active control systems based on passive vibration isolation.

[0006] (3) It is not conducive to the healthy and persistent work of the air spring vibration control system

This method cannot quickly, accurately and effectively calculate the stiffness of the air spring vibration control system when it is put into use, so its health status cannot be obtained, which is not conducive to the persistent work of the vibration control system

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