Rotating Machine Contact Position Detection via Phase Difference
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Solution Overview
Problem
Existing technologies for detecting abnormalities in rotating machines, such as contact between rotors and the casing, struggle to accurately specify the contact position during rotation, leading to inefficiencies in maintenance and diagnosis.
Innovation Solution
An abnormality detecting apparatus with multiple sensors positioned around a rotating machine calculates phase differences between sensor signals to determine contact positions by utilizing phase-only correlation functions and time-frequency analysis, allowing for precise identification of contact locations between rotors and the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are arranged at different locations to detect elastic waves, then contact position specification capability is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into multiple independent sensors positioned at different locations around the rotating machine. Each sensor independently detects elastic waves from potential contact points, and the control device processes signals from each sensor separately to determine phase differences and locate contact positions accurately.
Solution Approach 2:
The control device acts as an intermediary that receives signals from multiple sensors, performs phase difference calculations, and synthesizes this information to specify contact positions. This intermediary processing layer manages the complexity of multiple sensors while providing accurate contact location information.
2Measurement precision
If phase difference calculation is performed using multiple sensor signals, then contact position determination accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The system utilizes elastic wave vibrations generated by rotor contacts as the detection mechanism. By analyzing the phase differences of these vibration signals from multiple sensors, the system accurately determines contact positions without requiring complex mechanical intervention.
Solution Approach 2:
The patent replaces direct mechanical contact detection methods with elastic wave-based detection. Instead of using mechanical probes or direct physical measurement, the system uses acoustic/elastic wave signals and their phase relationships to infer contact positions, reducing mechanical complexity while improving measurement capability.
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
This approach enables accurate and efficient specification of contact positions, enhancing maintenance by providing detailed positional information of rotor contacts, thereby improving diagnostic accuracy and operational efficiency.
Implementation Method 1
a plurality of sensors each of which detects an elastic wave generating in the rotating machine having a rotor during rotation of the rotor
Data Source
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AI summary
An abnormality detecting apparatus (10) for a rotating machine includes: a calculating part (15) which calculates a phase difference between signals respectively output from two sensors of one or more sets, the one or more sets being predetermined combinations of two sensors among the plurality of sensors, the plurality of sensors each of which detects an elastic wave generating in the rotating machine (1) having a rotor during rotation of the rotor, the sensors being arranged at predetermined different locations of the rotating machine (1); a storing part (16) which stores in advance information concerning a relationship between a phase difference and a contact position when a contact occurs during the rotation of the rotor, regarding the one or more sets; and a specifying part (17) which specifies a contact position by using a phase difference calculated by the calculating part (15) and the information stored in the storing part (16).