Vibration Signal Acquisition System for Rotary Motor Diagnosis
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Solution Overview
Problem
Current systems for acquiring vibration signals from rotary engines require high calculation capacities and large memory storage due to the need for signal sampling at very high constant frequencies, over-sampling, and complex filtering operations, which monopolize on-board electronics resources.
Innovation Solution
A system that samples vibration signals directly at frequencies proportional to the motor's rotation speed, using a predetermined maximum harmonic ratio and sampling ratio, allowing for simplified processing and reduced memory usage by buffering a sample of synchronous vibrations, and extracting frequency signals through multiplication with Fourier coefficients of specific harmonics, avoiding interpolation and resampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vibration signals are sampled at very high constant frequencies with oversampling and narrow band-follower filters, then measurement precision and reliability are improved, but computing power requirements and device complexity increase significantly
Solution Approach 1:
The patent applies dynamics by making the sampling frequency variable rather than constant. The sampling frequency is dynamically adjusted to be proportional to the motor's rotational speed, allowing the system to adapt to varying operating conditions while maintaining measurement precision. This dynamic approach replaces the static high-frequency sampling with a flexible, condition-based sampling strategy that reduces computational burden.
Solution Approach 2:
The patent changes the sampling parameter from a fixed high frequency to a variable frequency proportional to motor speed. By modifying the sampling frequency parameter dynamically based on rotational speed, the system achieves accurate vibration measurement without the need for consistently high sampling rates, thereby reducing the monopolization of computing power and simplifying the electronic processing requirements.
2Measurement precision
If resampling operations with interpolation are performed on a very large number of points, then measurement precision is improved, but loss of time and productivity decrease due to computationally expensive operations
Solution Approach 1:
The patent applies preliminary action by performing the sampling at the appropriate frequency from the outset, proportional to motor speed, rather than requiring subsequent resampling and interpolation operations. This preliminary, well-timed sampling eliminates the need for computationally expensive post-processing operations, maintaining measurement precision while enabling real-time processing and improving overall system productivity.
3Measurement precision
If Fourier transforms are performed on a very large number of points across the entire bandwidth, then measurement precision is improved, but use of energy and computing power increase significantly
Solution Approach 1:
The patent applies the extraction principle by selectively sampling only the relevant frequency components proportional to motor speed, rather than performing Fourier transforms on the entire bandwidth. This extracts only the necessary information for vibration analysis, significantly reducing the computational load and energy consumption while maintaining the precision needed for detecting mechanical stresses and wear in rotating parts.
4Measurement precision
If very narrow band-follower filters are used for each harmonic ratio, then measurement precision is improved, but device complexity and computing power requirements increase
Solution Approach 1:
The patent applies universality by using a single sampling approach proportional to motor speed that serves multiple functions: it simultaneously captures all relevant harmonic components without requiring separate narrow band-follower filters for each harmonic ratio. This universal sampling method simplifies the filtering system while maintaining the precision needed for comprehensive vibration analysis across all harmonics.
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 minimizes calculation time and memory requirements, enabling real-time vibration signal acquisition without overloading on-board electronics, allowing for effective onboard diagnosis of rotary engines with reduced computational and storage demands.
Implementation Method 1
sampling means (5) configured to sample in real time said time-domain vibration signal with a sampling signal synchronized to said current rotation speed thus generating a synchronous vibration signal
Implementation Method 2
the computing means are configured to extract said frequency signals by multiplying said buffered sample with Fourier coefficients of only the harmonics to be extracted
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The invention relates to a method and a system for acquiring a vibratory signal in order to diagnose a rotary motor (7), comprising: input means (3) for receiving a temporal vibratory signal (X(t)) of said motor and at least one current rotation rate (N(t)) of at least one shaft (11) of said motor, and sampling means (5) for sampling said temporal vibratory signal (X(t)) in real time with at least one sampling signal (S) synchronized with said at least one current rotation rate thus generating a corresponding synchronous vibratory signal (x(nt)).