Telescope Torsion Compensation via Feedback Control
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Solution Overview
Problem
Astronomical telescopes with friction drives face significant challenges due to torsion angles, which cause non-linear interference, leading to fluctuations in load and reduced low-speed stability and tracking precision, with existing solutions like PID control algorithms providing only partial relief.
Innovation Solution
A control system comprising a torsion angle detection system and a compensation mechanism, using a linear optical grating scale to measure the driving wheel's position, feeding the signal to an industrial PC, and controlling a compensation motor to adjust the driving wheel's angle, ensuring parallel axial lines and maintaining stable contact between the driving and driven wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If friction drive is used for astronomical telescope, then structure design and manufacturing is simple and cost is low, but torsion angle causes non-linear interference and reduces tracking precision
Solution Approach 1:
The patent employs a feedback control system where sensors detect the torsion angle between driving and driven wheels, and the control system automatically adjusts the driving wheel's position to compensate for the detected torsion angle, thereby maintaining accurate tracking precision while preserving the simple friction drive structure
Solution Approach 2:
The system dynamically changes the positional parameter of the driving wheel to compensate for torsion angle variations. By adjusting the driving wheel's angular position in real-time, the system counteracts the non-linear interference caused by torsion angle while maintaining the simplicity of the friction drive mechanism
2Manufacturing precision
If torsion angle compensation is implemented, then tracking precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with an electronic control system. Instead of using elaborate mechanical devices to physically correct torsion angle, the system uses electronic sensors and control algorithms to detect and compensate for torsion angle, thereby improving tracking precision while keeping the added complexity manageable through electronic rather than mechanical means
3Stability of the object's composition
If PID control algorithm is used to suppress sudden skip, then low speed stability is partially improved, but the effect is not satisfactory and only alleviates the problem to a certain extent
Solution Approach 1:
The system applies preliminary anti-action by proactively compensating for torsion angle before it causes sudden skips. The feedback control system continuously monitors the torsion angle and adjusts the driving wheel position in advance to prevent the elastic deformation from exceeding friction force, thereby eliminating sudden skips rather than merely suppressing them after they occur
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system dynamically detects and compensates for torsion angle errors in real-time, enhancing low-speed stability and tracking precision, reducing manual effort and costs, and ensuring high reliability and repeatability.
Implementation Method 1
linear optical grating scale to measure the driving wheel's position
Data Source
AI summary
A control system for implementing nonlinear interference compensation for a torsion angle of an astronomical telescope is provided. The system includes a torsion angle detection system and a torsion angle compensation and amendment system. The torsion angle detection system is provided with a measurement mechanism for measuring the position of a driving wheel, and a position signal of the measurement mechanism is fed back to an industrial personal computer in the torsion angle compensation and amendment system in real time. An output signal of the industrial personal computer controls a compensation motor to rotate, and the compensation motor inclines an elastic plate with the driving wheel mounted thereon through a transmission mechanism, to further cause the torsion of the driving wheel by an angle and form compensation to the torsion angle.