Oscillatory Event Detection in Positioning Systems
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Solution Overview
Problem
Conventional methods for detecting errors in controlled systems fail to identify oscillatory events, which can lead to system instability, damage, and poor performance, as they only reset timers when actual positions return within thresholds without detecting fluctuations.
Innovation Solution
A system and method that monitor feedback signals from positioning devices to detect oscillatory events by determining if the actual position is both above a predetermined upper threshold and below a lower threshold within a predetermined period, declaring an oscillatory event and triggering diagnostic or protective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional steady state error detection methods are used, then simple threshold monitoring is implemented, but oscillatory events cannot be detected
Solution Approach 1:
The detection method is segmented into distinct phases: an initial steady state error detection phase using simple threshold monitoring, and an oscillatory event detection phase activated when threshold crossings occur. This segmentation allows the system to maintain simplicity for normal operation while enabling comprehensive oscillation detection when needed, resolving the contradiction between detection capability and complexity.
Solution Approach 2:
The detection system dynamically transitions between different detection modes based on system behavior. When the actual position remains within thresholds, simple steady state monitoring is used. When threshold crossings are detected, the system dynamically switches to oscillatory event detection mode, adjusting the detection strategy to match the actual system conditions and thereby improving reliability without permanently increasing complexity.
2Productivity
If timer reset on threshold return is implemented, then steady state errors are detected, but oscillatory fluctuations are missed
Solution Approach 1:
The timer behavior is segmented based on the detection phase. During steady state detection, the timer resets when the position returns within thresholds, enabling quick detection of steady state errors. During oscillatory detection phase, the timer continues counting to capture the full oscillation pattern. This segmented timer behavior allows the system to maintain fast response for steady state errors while achieving precise oscillation detection when needed.
Solution Approach 2:
The system changes the timer parameter behavior dynamically based on the detection phase. In normal operation, the timer resets on threshold return to maintain fast steady state detection. When oscillatory conditions are detected, the timer parameter is changed to continue counting, transforming it into an oscillation duration measurement tool. This parameter change enables the system to adapt its measurement precision to the current operational context.
3Reliability
If comprehensive oscillation detection is implemented, then system stability is improved, but detection algorithm complexity increases
Solution Approach 1:
The system performs preliminary detection of threshold crossings to determine whether oscillatory conditions exist before implementing comprehensive oscillation detection. This preliminary action allows the system to activate the more complex oscillation detection algorithm only when necessary, rather than continuously, thereby improving system stability through comprehensive detection while minimizing the actual computational complexity incurred during normal operation.
Solution Approach 2:
The complex oscillation detection logic is extracted as a separate, conditionally-executed module. The main detection algorithm remains simple for steady state errors, while the oscillation detection capabilities are taken out as a specialized subroutine that is only activated when threshold crossings indicate oscillatory behavior. This extraction isolates the complexity to only when needed, improving system stability without burdening the overall algorithm with continuous complexity.
Data Source
AI summary
Methods and systems for detecting an oscillatory event are provided. According to one embodiment, a system may include a controller configured to provide a command signal to a positioning device and a processor communicatively coupled to the controller. The command signal may include a reference position. The processor may be configured to monitor a feedback signal responsive to the command signal. The feedback signal may include an actual position of the positioning device. The processor may be further configured to determine that within a predetermined period of time the actual position is both above a predetermined upper threshold and below a predetermined lower threshold. Based on the determination, the processor may declare the oscillatory event.