Tunable Filter Control Apparatus for Overshoot Suppression
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Solution Overview
Problem
Position control systems for tunable filter apparatuses face challenges in rapidly moving characteristic tuning members, which can lead to overshooting and potential collision with the filter substrate, causing damage.
Innovation Solution
A control apparatus that includes a shaper generating a second target value changing substantially rampwise over a time equal to or shorter than a resonance frequency period and a compensator adjusting the control signal to prevent overshooting, along with a tunable mechanism using piezoelectric elements and levers to move the tuning members based on the control signal, ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the characteristic tuning member is rapidly moved closer to the filter substrate to change filter characteristics quickly, then the response speed is improved, but the position control precision deteriorates causing overshooting and potential collision damage
Solution Approach 1:
The control apparatus performs preliminary action by predicting the future position of the tuning member based on its current position and velocity. This prediction allows the system to prepare appropriate control signals in advance, enabling rapid movement while maintaining precise position control and preventing overshooting that would occur with conventional reactive control methods.
Solution Approach 2:
The system implements dynamic control by continuously adjusting control parameters based on real-time position and velocity feedback. The control apparatus dynamically modifies the drive signal characteristics during movement, allowing the tuning member to move rapidly when needed while automatically reducing speed near the target position to prevent collision, thus resolving the contradiction between speed and precision.
2Adaptability or versatility
If the characteristic tuning member is moved quickly to adapt to changing usage conditions, then the adaptability is improved, but the risk of collision and damage increases
Solution Approach 1:
By predicting the tuning member's future position before it reaches the target, the system can prepare deceleration commands in advance. This preliminary action enables the member to move quickly to adapt to changing filter requirements while ensuring it slows down appropriately before reaching the target position, preventing collision damage and maintaining operational reliability.
Solution Approach 2:
The control apparatus continuously receives feedback on the tuning member's position and velocity, using this information to dynamically adjust control signals. This closed-loop feedback mechanism allows the system to maintain high adaptability by quickly responding to filter characteristic changes while simultaneously ensuring reliability by detecting approaching target positions and adjusting speed to prevent collisions.
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
The solution effectively suppresses overshooting and reduces settling time, ensuring the characteristic tuning members converge to the target position without damaging the filter substrate, thereby enhancing the operational safety and efficiency of the tunable filter apparatus.
Implementation Method 1
a piezoelectric element that serves as a driving element to drive the characteristic tuning member
Data Source
AI summary
According to an embodiment, a control apparatus includes a shaper and a compensator. The shaper receives a first target value in position control of a controlled object and generates a second target value which changes substantially rampwise over a time equal to or shorter than a period corresponding to one of resonance frequencies of the controlled object until the second target value becomes equal the first target value. The compensator compensates for a control signal, used for controlling the controlled object, based on the second target value.