Rotating Shaft Control Using Stationary-Disturbance Signal Separation
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Solution Overview
Problem
Existing technologies face challenges in accurately characterizing and correcting the rotational behavior of a rotating shaft, which can be affected by defects, deformations, and gyroscopic effects, leading to axis misalignment and vibration.
Innovation Solution
A method for controlling a rotating shaft involves acquiring signals to be filtered based on measurements of the shaft's movement, filtering and breaking down these signals into stationary and disturbance components, comparing these components to setpoints, and generating commands for actuators to correct the shaft's rotation and positioning parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lateral analysis of radial parameters is used to characterize rotating shaft behavior, then the measurement approach is simple, but the ability to specifically characterise rotational behavior with reliable correction indicators is insufficient
Solution Approach 1:
The patent segments the signal into stationary and disturbance components through time-frequency breakdown. This allows separate analysis of each component's contribution to shaft behavior, enabling precise characterisation of rotational behavior while managing complexity through component-wise processing rather than analyzing the complete mixed signal at once.
Solution Approach 2:
The patent transitions from conventional lateral radial analysis to a time-frequency domain analysis. By decomposing signals in the time-frequency plane and analyzing stationary versus disturbance components separately, the method adds dimensional perspective that enables more precise characterisation of rotational behavior patterns.
2Reliability
If actuators are used to correct all shaft movement components, then comprehensive correction is achieved, but actuator usage is excessive when some components do not require correction
Solution Approach 1:
The patent applies local quality by treating stationary and disturbance components differently. Stationary components that represent normal operational behavior are left uncorrected, while only disturbance components causing actual deviations are corrected by actuators. This selective correction approach improves reliability by focusing on genuine problems while reducing unnecessary actuator energy consumption.
Solution Approach 2:
The patent implements partial action by correcting only the disturbance component rather than applying full correction to all movement components. The stationary component, representing normal shaft behavior, is excluded from correction, thereby avoiding excessive actuator usage while maintaining sufficient correction accuracy for actual deviations.
3Manufacturing precision
If complete signal correction is applied to rotating shaft measurements, then all deviations are addressed, but unnecessary corrections increase actuator usage and complexity
Solution Approach 1:
The patent extracts and separates the stationary component from the complete signal through time-frequency breakdown. By taking out the stationary component that represents normal operational behavior, the system avoids applying unnecessary corrections to these components, thereby reducing control system complexity while maintaining shaft positioning precision for actual disturbances.
Solution Approach 2:
The patent applies partial correction action by addressing only the disturbance component rather than correcting the complete signal. This selective approach achieves sufficient shaft positioning precision for actual problems while avoiding the increased complexity that would result from processing and correcting all signal components uniformly.
Data Source
AI summary
A method for controlling a rotating shaft by breakdown of measurements of said shaft into stationary and disturbance components. The method for controlling a rotating shaft comprises acquisition of a signal to be filtered (step 160); filtering and breakdown of the signal to be filtered into a stationary component and a disturbance component for each time-frequency pairing of the signal to be filtered (step 170); comparison of the stationary component with respect to a setpoint for each time-frequency pairing (step 190); comparison of the disturbance component with respect to said setpoint for each time-frequency pairing (step 200); and generation of a command of an actuator associated with said shaft such that the actuator modifies a rotation and/or positioning parameter of the rotating shaft (step 210).