研究目的
Investigating the performance of the METIS Cold Chopper Demonstrator (MCCD) tip/tilt mirror operating at 77 K, focusing on fast and accurate reference tracking using high-performance motion control strategies.
研究成果
The study demonstrated the feasibility of a high-performance cryogenic tip/tilt mirror for the METIS instrument. The repetitive controller showed superior performance in handling nonlinearities and achieving fast settling times, making it the preferred choice for the final hardware. Minor adjustments to the hardware and further tuning of the feedback controller are expected to meet all performance requirements.
研究不足
The presence of nonlinearities in the plant limits the performance of the hybrid controller. The accuracy of the nonlinear plant model is limited, making it challenging to fully compensate for hysteresis effects in the FF signal design. Additionally, the repetitive controller's performance is affected by stochastic disturbances, which can amplify system noise and external vibrations.
1：Experimental Design and Method Selection:
The study involved testing the MCCD mechanism's performance using different control strategies, including a novel hybrid controller and a repetitive controller, to achieve fast and accurate reference tracking. The methodology included system identification, control synthesis, and performance testing under cryogenic conditions.
2：Sample Selection and Data Sources:
The MCCD mechanism, designed for operation at 77 K, was the primary sample. Data were collected from tests performed in a cryostat, with measurements taken using Attocube position sensors based on laser interferometry.
3：List of Experimental Equipment and Materials:
The setup included a cryostat for maintaining the operating temperature, Attocube position sensors (type: FPS3010), voice coil actuators, and a MATLAB xPC target platform for implementing the digital controller.
4：Experimental Procedures and Operational Workflow:
The procedure involved system identification through frequency analysis, application of control strategies (hybrid and repetitive controllers), and performance evaluation based on settling time and positional accuracy. The system ran at a sampling rate of 10 kHz.
5：Data Analysis Methods:
Data analysis included fitting experimental data to system models, evaluating controller performance through simulation and experimental results, and comparing the effectiveness of different control strategies.
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