Vibrating Machine Resonance Analysis with Operating Vibration Subtraction
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Solution Overview
Problem
Existing resonance analysis methods for vibrating machines require shutdown and cannot accurately determine natural frequencies during operation due to dominant operating vibrations, leading to potential resonance catastrophes and high costs.
Innovation Solution
A method for resonance analysis of vibrating machines during operation by measuring operating vibrations, applying an excitation signal, and subtracting a correction signal to isolate the response vibration signal, allowing frequency analysis of natural frequencies without shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the machine is stopped for vibration measurement, then the vibration response can be measured without superposition from other vibration signals, but the machine operation is interrupted causing downtime and loss of productivity
Solution Approach 1:
The patent enables vibration measurements to be performed continuously during machine operation without interruption. The sensor system records vibrations while the machine runs, and signal processing methods separate the excitation response from operating vibrations, allowing uninterrupted productivity while maintaining measurement capability
Solution Approach 2:
The patent records operating vibration signals before applying the excitation signal. This preliminary recording allows the system to know the current operating vibration characteristics, which are then used to subtract background vibrations from the measurement signal, enabling accurate measurements during operation
2Productivity
If the machine operates during measurement, then productivity is maintained, but the operating vibrations dominate and mask the natural frequencies making accurate determination impossible
Solution Approach 1:
The patent extracts the operating vibration signal from the total measured signal and removes it through subtraction. By isolating and eliminating the dominant operating vibration component, the underlying natural frequency response becomes visible and measurable during machine operation
Solution Approach 2:
The system uses feedback by continuously monitoring operating vibrations and using this information to adjust the subtraction signal in real-time. This feedback mechanism ensures that changing operating conditions are compensated for, maintaining measurement accuracy throughout the operation
3Measurement precision
If traditional resonance analysis is performed with the machine stopped, then accurate natural frequency determination is possible, but the results do not reflect the actual operating conditions including surrounding machine vibrations and loading effects
Solution Approach 1:
The patent transitions from static measurements (machine stopped) to dynamic measurements (machine running). The system adapts to changing operating conditions by continuously updating the operating vibration reference and adjusting the subtraction signal, allowing natural frequency determination under realistic dynamic operating conditions
Solution Approach 2:
The patent changes the measurement parameter from idealized stationary conditions to actual operating conditions. By measuring and subtracting operating vibrations that include surrounding machine vibrations and loading effects, the system determines natural frequencies that are relevant to the actual operating state
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 accurate determination of natural frequencies under realistic operating conditions, reducing downtime and costs, and preventing resonance catastrophes by accounting for surrounding machine vibrations and loading conditions.
Implementation Method 1
exciting the vibrating machine during operation with an excitation signal for exciting additional vibrations in the vibrating machine
Implementation Method 2
determining a subtraction signal by subtracting the correction signal from the response vibration signal
Data Source
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AI summary
The invention relates to a method for resonance analysis of a vibrating machine, in particular a vibrating screen or a vibrating conveyor, comprising the following steps during operation: - determining an operational vibration signal, which comprises the vibrations of the machine in regular operation, - exciting the vibrating machine during operation by an excitation signal for exciting additional vibrations on the vibrating machine, - measuring a response vibration signal of the vibrating machine in response to the excitation, - determining a subtraction signal by using the operational vibration signal as a correction signal which is subtracted from the response vibration signal, and - carrying out frequency analysis of the subtraction signal, the dominant frequencies of the subtraction signal corresponding to the natural frequencies of the system in the frequency range of the excitation signal.