Vibration Reliability Calculation Using Image Comparison

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Solution Overview

Problem

Conventional techniques fail to adequately evaluate the reliability of vibration waveforms measured non-contactually using images, particularly when local deformations such as cracking occur, as they cannot distinguish between genuine vibration and deformation-induced movements.

Innovation Solution

A vibration reliability calculation apparatus and method that acquires time-series images and calculates a reliability level by comparing images to differentiate between genuine vibration and deformation-induced components, using similarity correlation functions to assess the reliability of the vibration waveform.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If non-contact vibration measurement is performed using images, then attachment and removal of sensors is eliminated and measurement efficiency is improved, but the reliability of the measured vibration waveform cannot be adequately evaluated when local deformations occur

Engineering Contradiction:

Improvemeasurement efficiencyVSAvoidvibration waveform reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent divides the measurement process into two independent components: vibration measurement using image-based displacement detection and reliability evaluation using distance measurement. This segmentation allows the system to separately assess genuine vibration from deformation-induced movements, resolving the reliability issue while maintaining measurement efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a distance measurement apparatus (laser range finder or ultrasonic range finder) as an intermediary device to measure distance changes between the image capturing apparatus and the object. This intermediary measurement enables the system to distinguish between actual vibration and surface deformation, providing a reliability indicator for the vibration waveform.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If distance measurement apparatus is added to measure vibration in optic axis direction, then three-dimensional vibration measurement is achieved, but device complexity increases

Engineering Contradiction:

Improvethree-dimensional measurement capabilityVSAvoidapparatus structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The distance measurement apparatus serves multiple functions: it measures the vibration component in the optic axis direction, provides reliability evaluation data by detecting distance changes, and enables three-dimensional vibration analysis. This multi-functionality justifies the added device while maximizing its utility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces complex mechanical vibration sensors with non-contact image-based measurement for two-dimensional vibration detection, and complements it with non-contact distance measurement for the third dimension. This substitution of mechanical systems with optical and electromagnetic measurement methods simplifies the overall system despite adding a distance measurement device.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 evaluation of vibration waveform reliability even in cases where conventional methods fail, by distinguishing between movement and deformation, thereby improving the assessment of non-contact vibration measurements.

Implementation Method 1

a vibration measurement apparatus that uses an image capturing apparatus... derives a displacement distribution of the surface of the object from the acquired time-series images

Methodology Applied

Scientific EffectImage-based measurement: Photogrammetry

Implementation Method 2

a vibration measurement apparatus that is also provided with a distance measurement apparatus such as a laser range finder

Methodology Applied

Scientific EffectLaser range finding: LIDAR

Implementation Method 3

a distance measurement apparatus such as a laser range finder or an ultrasonic range finder

Methodology Applied

Scientific EffectUltrasonic range finding: Ultrasound

Data Source

PatentUS11509827B2Vibration reliability calculation apparatus, vibration reliability calculation method, and computer readable recording medium

Publication Date: 2022.11.22 NEC CORP

AI summary

A vibration reliability calculation apparatus 10 is provided with an image acquisition unit 11 that acquires time-series images of an object that are output by an image capturing apparatus that shoots the object, and a reliability calculation unit 12 that calculates, for a vibration waveform of the object that is derived from a result of comparing one image and another image that constitute the acquired time-series images, a reliability level indicating a reliability of the vibration waveform.