Rotating Component Noise Troubleshooting via Acoustic Frequency Analysis

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Solution Overview

Problem

Current methods for troubleshooting noise or vibration issues in systems with rotating components are time-consuming and expensive, often requiring the removal of components or the use of costly diagnostic tools to identify defective parts.

Innovation Solution

A method and system that involves receiving an audio signal from rotating components, generating a frequency spectrum, selecting the frequency corresponding to the maximum amplitude, and comparing it to predetermined rotational speeds to identify potentially defective components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional troubleshooting methods are used (removing components one after another), then the defective component can be identified, but the process is time-consuming and expensive

Engineering Contradiction:
Improvedefective component identification accuracyVSAvoidtroubleshooting time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the mechanical troubleshooting method (removing components physically) with an acoustic analysis system. The system uses audio sensors to capture sounds from rotating components, processes these signals through Fourier transforms to generate frequency spectra, and automatically identifies defective components by comparing detected frequencies with expected rotational speeds. This substitution eliminates the need for physical component removal while maintaining identification accuracy.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary acoustic signal analysis system between the rotating components and the troubleshooting process. Instead of directly manipulating components, the system captures acoustic emissions as intermediaries, processes them through spectral analysis, and uses the resulting frequency data to identify defects. This intermediary approach enables non-contact, non-intrusive detection.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Measurement precision

If expensive diagnosis tools are used, then the defective component can be identified, but the cost increases significantly

Engineering Contradiction:
Improvedefective component identification accuracyVSAvoiddiagnosis tool cost
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent creates a digital copy of the acoustic signal through audio recording and processes this copy through computational algorithms. Instead of requiring expensive physical diagnostic equipment, the system uses software-based spectral analysis (Fourier transforms) to extract diagnostic information from the recorded audio signals. This copying approach enables sophisticated analysis using inexpensive hardware.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent transforms the acoustic signal from the time domain to the frequency domain through Fourier transforms. This parameter change enables the system to identify defects by analyzing frequency characteristics rather than requiring complex expensive equipment. The transformation converts audible sounds into frequency spectra that can be automatically interpreted by comparing against expected rotational speed parameters.

Inventive Principle:
Principle #35Parameter changes

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 allows for a faster and more cost-effective identification of defective components by analyzing audio signals to match frequencies with rotational speeds, reducing the need for extensive component removal or expensive tools.

Implementation Method 1

receiving an audio signal of the rotating components in operation

Methodology Applied
Scientific EffectAcoustic emission: Acoustic Emission

Implementation Method 2

generating a frequency spectrum corresponding to the audio signal

Methodology Applied
Scientific EffectFourier transform:

Data Source

PatentUS7997140B2Method and apparatus for troubleshooting noise/vibration issues of rotating components
Publication Date: 2011.08.16 PRATT & WHITNEY CANADA CORP
  • US7997140B2 patent drawing
  • US7997140B2 patent drawing
  • US7997140B2 patent drawing

AI summary

There is provided a method for troubleshooting noise/vibration issues of rotating components, the method comprising: receiving an audio signal of the rotating components in operation; generating a frequency spectrum corresponding to the audio signal; selecting a frequency νm in the frequency spectrum corresponding to a maximum amplitude; and comparing the frequency νm to a set of predetermined rotational speeds of the rotating components to find a match; thereby identifying a potentially defective component.