Machine Drive Vibration Analysis for Component State Detection
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Solution Overview
Problem
Existing machine monitoring systems are costly, difficult to integrate, susceptible to interference, and require significant effort to evaluate sensor signals, often failing to reliably determine the state of machine components due to complex interactions.
Innovation Solution
A control device connects a drive to a power supply using an actuator to excite vibrations within a specific frequency range, which are then analyzed by a sensor to determine the state of machine components, allowing for reliable evaluation without external excitation or complex signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensors and evaluation circuits are used to monitor machine components, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The drive unit itself generates the excitation signal and processes the sensor data, eliminating the need for separate external excitation devices and complex evaluation circuits. The control device uses the drive's own operational data to monitor component conditions, making the system self-sufficient and reducing overall complexity.
Solution Approach 2:
The control device performs multiple functions: it controls the drive unit, generates excitation signals, processes sensor data, and monitors component states. This multi-functionality consolidates what would otherwise require separate dedicated systems, reducing device complexity while maintaining measurement precision.
2Measurement precision
If traditional sensors are used to detect component states, then measurement precision is improved, but susceptibility to interference increases
Solution Approach 1:
The vibration sensor detects mechanical vibrations as an intermediary phenomenon that reflects the actual component state without being directly exposed to electrical interference. By measuring mechanical vibrations rather than electrical signals directly, the system avoids susceptibility to electrical interference while maintaining accurate component state detection.
3Measurement precision
If external excitation devices are used to generate vibrations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The drive unit generates its own excitation signal through controlled variations in operational parameters, eliminating the need for external excitation devices. The control device modulates the drive's operation to create the necessary vibrations for transfer function determination, making the system self-sufficient and reducing complexity.
4Measurement precision
If multiple sensors and evaluation circuits are deployed, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The control device combines multiple functions into a single integrated system: it controls the drive, processes sensor signals, determines transfer functions, and monitors component states. This consolidation eliminates the need for separate signal transmission and evaluation systems, reducing operational effort while maintaining comprehensive monitoring 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 method enables cost-effective, simple, and reliable monitoring of machine components by analyzing the frequency of induced vibrations, providing clear insights into the state of individual components and the overall system, reducing interference and operational complexities.
Implementation Method 1
the drive directly or indirectly excites vibrations in the machine having a frequency range
Data Source
AI summary
A machine having a drive that directly or indirectly excites vibrations in the machine over a frequency range when the drive is connected to the power supply. A sensor detects a time-dependent signal that is characteristic of the excited vibrations. The time-dependent signal is transmitted to a control device that analyzes the frequency of the time-dependent signal and relates the frequency analysis to the excitation that produces the excitation and uses this relationship to determine a state of at least one element of the machine. The control device outputs a message to an operator of the machine on the basis of the state that is determined. Preferably, the control device applies an interference variable that has at least one frequency inside the frequency range to the drive so as to excite vibrations. The interference variable may be a sinusoidal interference variable whose frequency passes through the frequency range, or a pseudobinary interference variable whose spectrum covers the frequency range. If the drive is an electrical three-phase drive, asymmetrical energization may be used.