Rotating Machinery Vibration Tracking During Speed Changes
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Solution Overview
Problem
Existing vibration analysis methods for rotation mechanisms cannot detect operational anomalies when the rotation speed changes, as they are limited to specific rotation speeds and do not account for acceleration and deceleration phases.
Innovation Solution
A vibration analysis apparatus that stores correspondence information between rotation speed changes and vibration frequency changes, extracts and analyzes second vibration frequencies corresponding to acceleration peaks, and calculates waveform areas to determine operational anomalies using a regression equation and threshold comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration analysis is performed using fixed rotation speed thresholds, then measurement precision is improved for constant speed operations, but the system cannot detect anomalies during acceleration and deceleration phases
Solution Approach 1:
The patent applies dynamics by making the vibration frequency thresholds dynamic rather than fixed. The anomaly determination unit adjusts the reference vibration frequencies based on the actual rotation speed, which changes during acceleration and deceleration. This allows the system to maintain high measurement precision across varying operating conditions, resolving the contradiction between precision for constant speed and adaptability to varying speeds.
Solution Approach 2:
The patent changes the parameter of vibration frequency thresholds from static to dynamic values. By storing multiple sets of reference vibration frequencies corresponding to different rotation speeds and selecting the appropriate set based on current speed, the system achieves both precise anomaly detection and adaptability to speed variations.
2Device complexity
If vibration analysis uses a single reference threshold, then device complexity is reduced, but measurement precision deteriorates when rotation speed changes
Solution Approach 1:
The patent segments the vibration analysis into multiple frequency bands, each with its own reference threshold. Instead of using a single threshold for all conditions, the system divides the vibration spectrum into several sections (e.g., low frequency, mid frequency, high frequency) and applies appropriate thresholds to each, improving precision while keeping individual threshold sets manageable.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing multiple sets of reference vibration frequencies corresponding to different rotation speeds before actual operation. This preparation allows the system to quickly select the appropriate thresholds during operation without complex real-time calculations, balancing precision with manageable complexity.
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
Enables the detection of operational anomalies in rotation mechanisms with changing rotation speeds by tracking peak frequency shifts and calculating waveform areas, effectively addressing the limitations of previous methods.
Implementation Method 1
vibration data indicating vibration of the rotation mechanism when vibration of the rotation mechanism is analyzed
Implementation Method 2
calculate, for each second acceleration peak, a waveform area that is an area of a waveform of the second acceleration peak by integrating the second acceleration peak over a specific frequency section
Data Source
AI summary
A vibration analysis apparatus includes: a storage unit storing a regression equation indicating correspondence between rotation speed change of a rotation mechanism and a peak occurrence frequency of acceleration of vibration, for each acceleration peak; an analysis unit extracting a peak occurrence frequency of acceleration of vibration for each acceleration peak, based on vibration data of the rotation mechanism and calculating, for each acceleration peak, a waveform area of the acceleration peak by integrating the acceleration peak over a specific frequency section; and an anomaly determination unit determining whether operational anomaly occurs in the rotation mechanism for each acceleration peak. The analysis unit tracks, in accordance with the regression equation, change in peak occurrence frequency due to rotation speed change when vibration of the rotation mechanism is analyzed, and calculates, for each second acceleration peak, the waveform area of the second acceleration peak corresponding to the second vibration frequency tracked.