3D Vibration Measurement Using Surface and Normal Displacement Calculation

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Solution Overview

Problem

Existing vibration measurement techniques using imaging and distance measurement apparatuses face challenges in accuracy and sampling rate, particularly for three-dimensional vibrations, due to low repeat accuracy of distance measurement and time delays in vibration component calculation, leading to deteriorated measurement accuracy and varying results.

Innovation Solution

A vibration measurement apparatus and method that calculates displacements in both surface and normal directions based on time-series images from an imaging apparatus, enabling accurate three-dimensional vibration measurement by using surface-direction and normal-direction displacement calculation units to derive vibrations, thereby improving measurement accuracy and reducing time delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a distance measurement apparatus is used to measure vibrations in the distance direction, then three-dimensional vibration measurement is enabled, but the measurement accuracy deteriorates due to low repeat accuracy and time delays

Engineering Contradiction:

Improvethree-dimensional vibration measurement capabilityVSAvoiddistance direction vibration measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent combines multiple measurement approaches (imaging apparatus for two-dimensional vibrations and distance measurement apparatus for distance direction vibrations) into a single integrated system. The vibration measurement apparatus processes both image data and distance data through unified calculation units that compute displacement in surface directions and normal directions, then integrates these to determine three-dimensional vibration components, thereby resolving the accuracy issue while maintaining three-dimensional measurement capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces a vibration calculation unit that acts as an intermediary to process and integrate data from both the imaging apparatus and distance measurement apparatus. This intermediary unit performs coordinated calculations using image processing results and distance measurement results to compute final vibration components, mediating between the two measurement systems to achieve accurate three-dimensional vibration measurement

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If distance values are averaged multiple times to increase measurement accuracy, then stability is improved, but sampling rate decreases to 10-30 Hz

Engineering Contradiction:

Improvemeasurement stabilityVSAvoidsampling rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs preliminary averaging calculations on distance values in advance, storing the averaged results for subsequent vibration calculations. By pre-processing the distance data through multiple measurements and averaging, the system establishes stable baseline values that can be used at higher sampling rates without requiring real-time averaging during vibration measurement, thus maintaining both stability and productivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic processing where the system adaptively manages the averaging process based on measurement conditions. The vibration calculation unit dynamically coordinates between image-based displacement calculations and distance-based displacement calculations, adjusting the processing workflow to maintain appropriate sampling rates while ensuring sufficient averaging for accuracy when needed

Inventive Principle:

Principle #15Dynamics

3Productivity

If image processing is used to calculate displacement in surface directions, then sampling rate can reach 60 Hz, but distance direction measurements include time delays due to averaging

Engineering Contradiction:

Improvesampling rateVSAvoidtime delay in distance direction vibration components

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the vibration calculation unit continuously coordinates between image-based displacement calculations and distance-based displacement calculations. The system uses feedback from the image processing results to adjust and synchronize the distance measurement processing, ensuring that both measurement streams are temporally aligned and that time delays are minimized through coordinated processing

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11391621B2Vibration measurement apparatus, vibration measurement method, and computer-readable recording medium

Publication Date: 2022.07.19 NEC CORP

AI summary

A vibration measurement apparatus 10 is an apparatus for measuring vibrations of an object 30. The vibration measurement apparatus 10 includes: a surface-direction displacement calculation unit 11 configured to calculate, based on time-series images of a measurement target area that are output from an imaging apparatus 20, a displacement in a surface direction of the measurement target area; a normal-direction displacement calculation unit 12 configured to calculate a displacement in a normal direction of the measurement target area, based on the time-series images and the displacement in the surface direction of the measurement target area; and a vibration calculation unit 13 configured to calculate vibrations of the object 30, based on the calculated displacement in the surface direction of the measurement target area and the calculated displacement in the normal direction of the measurement target area.