Rivet Joint Inspection Using Line Sensor Vibration Mapping
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Solution Overview
Problem
Existing methods for inspecting the joint quality between plate members joined with rivets are time-consuming, as they require multiple measurements around the circumference of the caulking portion to assess the entire joint situation.
Innovation Solution
An inspection apparatus that applies elastic waves under various vibration conditions to collectively image the spatial distribution of physical quantities on the observation surface, allowing for quick assessment of joint quality by detecting changes in vibration displacement patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple measurements are taken around the circumference of the caulking portion to inspect the entire joint situation, then the inspection coverage is improved, but the inspection time increases
Solution Approach 1:
The patent combines multiple measurement operations into a single simultaneous measurement by using a line sensor that detects the entire circumference of the caulking portion at once. Instead of moving a probe around the circumference to take multiple sequential measurements, the line sensor captures all spatial information in one measurement cycle, thereby maintaining complete inspection coverage while dramatically reducing inspection time.
Solution Approach 2:
The patent transitions from one-dimensional point-by-point measurement using a single probe to two-dimensional line-shaped simultaneous measurement using a line sensor. This dimensional change allows the entire circumferential distribution of vibration characteristics to be captured in a single measurement, resolving the contradiction between comprehensive inspection coverage and lengthy inspection time.
2Device complexity
If a single probe is used for measurement, then the device complexity is reduced, but the measurement efficiency decreases
Solution Approach 1:
The patent employs a line-shaped sensor instead of a point probe, transforming the measurement from one-dimensional sequential detection to two-dimensional simultaneous detection. This dimensional enhancement allows the sensor to capture the entire circumferential vibration pattern in one measurement, significantly improving measurement efficiency without requiring multiple separate probes or complex multi-probe coordination systems.
Solution Approach 2:
The line sensor serves multiple measurement functions simultaneously - it detects vibration characteristics at all circumferential positions of the caulking portion in one operation, whereas a single point probe would require multiple repositioning operations. This multi-functionality of the line sensor achieves high measurement efficiency while keeping the device configuration relatively simple.
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 enables rapid inspection of joint quality across the entire circumference of the caulking portion, reducing inspection time and providing a simple configuration for determining defective or undefective joints.
Implementation Method 1
a vibrating unit that applies a plurality of elastic waves to an observation surface of the joined body under a plurality vibration conditions in which one of frequencies, spatial distribution of amplitudes and/or phases of the elastic waves are different from that of each other conditions
Implementation Method 2
a detection unit that collectively detects spatial distribution of physical quantities relating to displacement of vibration caused by the elastic waves at joint portions between the members or in the vicinities of the joint portions on the observation surface
Data Source
AI summary
Provide an inspection apparatus and an inspection method capable of quickly inspecting a situation of joining between members in a joined body. The inspection apparatus is an inspection apparatus inspecting a situation of joining between a plurality of members in a joined body including the members joined to and overlapped one another.