Rotating Machine AE Rubbing Detection With Suppression Control
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Solution Overview
Problem
Rubbing in rotating machines reduces their operating range and often requires emergency stopping, as existing detection methods like shaft vibration detection are late and impact machine operation, while early detection via acoustic signals does not address how to control the machine to prevent rubbing.
Innovation Solution
An operating condition decision device using an AE sensor to detect rubbing based on acoustic signals, determining the presence of rubbing, and deciding on a rubbing suppression operating condition to control the machine, thereby extending its operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shaft vibration detection is used to detect rubbing, then rubbing can be detected, but detection occurs only after thermal bending has occurred, requiring emergency stopping and significantly impacting machine operation
Solution Approach 1:
The patent applies preliminary action by using acoustic emission sensors to detect rubbing at an early stage before thermal bending occurs. The system continuously monitors acoustic signals and identifies rubbing conditions in advance, enabling preventive control actions to be taken before the rubbing progresses to a stage requiring emergency shutdown.
2Reliability
If excessive margins are set for operating conditions to prevent rubbing, then rubbing can be suppressed, but the operating range of the rotating machine is restricted
Solution Approach 1:
The patent applies dynamics by implementing dynamic control strategies that adjust operating conditions in real-time based on actual rubbing detection. Instead of using fixed excessive margins, the system continuously monitors acoustic signals and dynamically adjusts parameters like rotation speed and load to suppress rubbing only when necessary, thereby maintaining a broader operating range while ensuring reliability.
3Loss of time
If acoustic signals are used for early rubbing detection, then detection timing is improved, but control strategies to suppress rubbing and extend operating range were not previously addressed
Solution Approach 1:
The patent applies feedback by establishing a closed-loop control system where acoustic emission signals provide continuous feedback on rubbing conditions. The control device receives real-time acoustic data, analyzes rubbing status, and automatically adjusts operating parameters in response, creating an automated feedback mechanism that eliminates the need for manual control strategies while enabling early detection and suppression.
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
Accurately determines operating conditions to suppress rubbing, preventing emergency stops and extending the operating range of rotating machines by implementing specific control measures when rubbing is detected.
Implementation Method 1
an AE sensor, disposed on a fixed part of the rotating machine, for acquiring an AE signal of the rotating machine
Data Source
AI summary
An AE signal is acquired from an AE sensor disposed on a fixed part of the rotating machine, and the presence or absence of rubbing in the rotating machine is determined, based on the AE signal. As a result, if the rubbing is determined to be present, a rubbing suppression operating condition imposed on control of the rotating machine is decided to suppress the rubbing.