Self-adaptive high-order vibration active control method for mechanical refrigerator

Abstract

The invention discloses a self-adaptive high-order vibration active control method for a mechanical refrigerator, and the method comprises the following steps: (1) transmitting an AC drive control signal x (n) into the mechanical refrigerator, and driving a linear motor; (2) inputting the AC drive control signal x (n) as a reference signal and an acquired vibration signal e (n) into a self-adaptive high-order vibration active controller together to generate a shock absorber drive control signal y (n); (3) inputting the generated shock absorber driving control signal y (n) into a shock absorber, driving the shock absorber to output a shock absorption force y '(n), counteracting a vibration force d (n) generated by the refrigerator, and collecting and updating a vibration signal e (n); and (4) inputting the collected and updated vibration signal e (n) and the AC driving control signal x (n) into the self-adaptive high-order vibration active controller again to generate a new y (n), and returning to the step (3). The mean square error of e (n) is minimized by means of iteration between the step (3) and the step (4). Actual measurement proves that when the method is used for actively controlling the high-order vibration of the mechanical refrigerator, rapid and effective convergence suppression of each order can be realized.

Description

Technical field: [0001] The invention relates to a mechanical refrigerator self-adaptive high-order active vibration control method, which is suitable for scenes that require the application of a mechanical refrigerator to provide a low-temperature environment but have high vibration requirements, such as precision optical loads. The invention can quickly and adaptively reduce the vibration interference of multi-order frequencies, improve the stability of the refrigerator, and is of great significance to scenarios such as aerospace precision optical loads. Background technique: [0002] Mechanical refrigerators have large cooling capacity, low cooling temperature, high efficiency, small size, and light weight, which meet the temperature requirements for normal work of infrared detectors and superconducting filters. With the successful development of the Oxford-type Stirling refrigerator in the late 1980s, the life and reliability of the mechanical refrigerator have been grea...

AI Technical Summary

Problems solved by technology

The vibration of the mechanical refrigerator will cause great harm to the instrument; the vibration will drive the detection device connected to the cold finger to reciprocate, which will deviate from the normal "focus depth" range of the optical system of the instrument, resulting in blurred imaging, which will affect the resolution and accuracy of the detection target. Decreased positioning accuracy; vibration will cause electromagnetic interference signals, and even cause mechanical resonance of the instrument, which will cause greater interference to some sensitive sensors

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