Driving control system for gas extruding suspension device and method thereof

Abstract

The invention discloses a driving control system for a gas extruding suspension device. The driving control system comprises a digital controller module, a signal generator, a controllable gain amplifying module, a piezoelectric ceramic driving power supply module and a signal processing module, wherein an analog sinusoidal signal generated by the signal generator module is amplified primarily through the controllable gain amplifying module, then enters the piezoelectric ceramic driving power supply module, and is used for driving the gas extruding suspension device after undergoing power amplification; the suspension height of the gas extruding suspension device is converted into a voltage feedback signal through a displacement sensor; the feedback signal is input to the digital controller module after undergoing filtering conditioning of the signal processing module and A / D (Analog to Digital) conversion; and the digital controller is used for processing the signal by using a PID (Proportion Integration Differentiation) control algorithm, and the signal is converted into an analog voltage signal by using a D / A (Digital to Analog) converter in the digital controller module and is input into the controllable gain amplifier module. Due to the adoption of the driving control system, the gain factor of the controllable gain amplifying module is controlled, the voltage amplitude input into the gas extruding suspension device is changed finally, and the suspension height of the suspension device is accurate and stable.

Description

technical field [0001] The invention relates to a drive control system and method of a gas extrusion suspension device, belonging to the field of gas lubrication and automatic control. Background technique [0002] Gas extrusion film lubrication is a transducer made of piezoelectric ceramics or magnetostrictive materials that generates high-frequency vibrations along the normal direction of the support surface, so that the gas in the gap is continuously squeezed to form a pressure gas film, resulting in load bearing The lubricating method with high capacity; Compared with other lubricating methods, it has the advantages of simple structure and self-adaptation. The gas squeeze film suspension bearing designed using the gas squeeze film lubrication theory overcomes the defects of traditional dynamic and static pressure bearings. While having high precision, it can support stationary objects without requiring an additional pressure gas source. [0003] A complete gas squeeze f...

AI Technical Summary

Problems solved by technology

In addition, because it is a mechanical device driven by the inverse piezoelectric effect, this leads to two consequences: during normal operation, since the piezoelectric ceramic expands and contracts under the action of an electric field, its capacitance changes with the voltage change, This will cause a charging and discharging process of the actuator, which will have an adverse effect on the driving power

Secondly, the capacitance of the actuator will also be affected by the driving frequency. When the natural vibration frequency of the actuator itself is the same as or close to the driving frequency, the capacitive reactance will drop significantly due to resonance, which will also affect the output of the driving power supply.

The performance of the control system will also be affected by the above properties, and there is no accurate mathematical model for describing the gas squeeze film suspension device

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