Polydyne Acceleration Trajectory Control for Vibration Suppression
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Solution Overview
Problem
High-speed and high-precision positioning systems, such as data storage devices, face challenges in suppressing residual vibrations related to mechanical resonant modes, particularly during long motions where abrupt acceleration leads to shock and vibration, affecting precise positioning.
Innovation Solution
The implementation of polydyne acceleration trajectory control using polydyne curves that ramp acceleration up and down, suppressing residual vibrations by designing curves that do not excite resonant modes and canceling transient vibrations generated at the beginning and end of acceleration ramps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If abrupt acceleration is used for high-speed positioning, then positioning speed is improved, but residual vibrations and shock increase
Solution Approach 1:
The patent applies preliminary action by pre-ramping the acceleration signal before the main positioning move. The acceleration ramp-up phase is designed to gradually excite the actuator mechanism, bringing it to readiness without causing abrupt vibrations. This preliminary preparation allows the subsequent high-speed positioning to proceed with minimal residual vibrations, effectively resolving the contradiction between speed and vibration suppression.
2Manufacturing precision
If acceleration ramp-up is used to suppress vibration, then positioning precision is improved, but positioning time increases
Solution Approach 1:
The patent employs dynamics by making the acceleration profile adaptive rather than fixed. The system dynamically adjusts the acceleration ramp characteristics based on real-time feedback from vibration sensors and the specific positioning requirements. This allows the acceleration ramp duration to be optimized for each individual move, achieving vibration suppression without unnecessarily extending positioning time, thus resolving the contradiction between precision and speed.
3Object-generated harmful factors
If polydyne acceleration ramps are used to suppress multiple resonant modes, then vibration suppression is improved, but control system complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the polydyne acceleration ramp parameters (such as ramp duration, amplitude, and frequency content) to target different resonant modes. Instead of adding complex hardware components, the solution modifies the control parameters of the existing actuator system. The polydyne ramp parameters are adjusted based on the identified resonant frequencies, allowing effective suppression of multiple modes through parameter optimization rather than system complexity increase.
Data Source
AI summary
Various illustrative aspects are directed to a system comprising: an actuator; a control object, controlled by the actuator; and one or more processing devices, configured to perform positioning control of the control object via the actuator, wherein performing the positioning control comprises: generating a trajectory control signal for a trajectory that comprises a polydyne acceleration ramp; and outputting the trajectory control signal to the actuator.