Positioning Table for Impact Excitation Measurement
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Solution Overview
Problem
Existing methods for non-destructive evaluation of 3D-printed parts, particularly in assessing porosity and microcracks, are inaccurate and lack reproducibility, with X-ray micro-CT being expensive and time-consuming, and other techniques failing to resolve all quality-decreasing structural properties accurately.
Innovation Solution
An impact excitation (IE) measurement system with a positioning table and support system that ensures precise placement of the solid piece, minimizing external friction, and a sensor to analyze vibrational response for eigenfrequencies and damping parameters, allowing for accurate and repeatable quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray micro-CT is used for quality assessment, then measurement accuracy is improved, but measurement time and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical/X-ray imaging system with an acoustic vibration-based measurement system. By exciting the 3D-printed part with impact forces and analyzing its vibrational response, the system extracts quality information (porosity, microcracks) through acoustic signatures, eliminating the need for time-consuming X-ray micro-CT scanning while maintaining measurement capability
Solution Approach 2:
The patent changes the measurement parameter from direct structural imaging (X-ray micro-CT) to dynamic vibrational characteristics (natural frequencies, damping ratios). This parameter transformation allows quality assessment through acoustic response analysis, which is much faster than volumetric imaging while still detecting internal defects that affect structural dynamics
2Productivity
If traditional impact excitation measurement is used, then measurement speed is improved, but measurement precision and reproducibility deteriorate due to external friction and positioning errors
Solution Approach 1:
The patent extracts the solid piece from the piece holder immediately before measurement and supports it solely on the flat bed support during the actual measurement process. This extraction eliminates the piece holder from the measurement system, removing the source of positioning errors and external friction that would otherwise contaminate the vibrational response and reduce measurement precision
Solution Approach 2:
The patent creates an equipotential measurement condition by using a flat bed support with elasticity much larger than the solid piece, ensuring uniform support across the entire base of the piece. This uniform support minimizes localized friction effects and positioning variations, enabling reproducible measurements while maintaining rapid measurement capability
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 and reproducible measurement of eigenfrequencies and damping parameters, effectively detecting both porosity and microcracks in 3D-printed parts, providing a quantitative assessment of quality and process consistency.
Implementation Method 1
The top part comprises a flat bed support comprising an elasticity which is larger than the elasticity of the solid piece
Implementation Method 2
an impactor for providing an impact to a solid piece
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~4B
AI summary
The present invention concerns an impact excitation (IE) measurement system for measuring the vibrational response of a solid piece to an impulse impact, comprising: an impactor for providing an impact to a solid piece; a sensor for obtaining a vibrational response of the solid piece to the impact; a support system for supporting the solid piece during providing the impact and obtaining the vibrational response; a positioning table comprising: a piece holder configured to receive the solid piece in a predetermined holder position with respect to the piece holder, and an actuator operably connected to the piece holder and configured to: transfer the piece holder with a solid piece in said predetermined holder position to the support system; place the solid piece on the support system in a predetermined support position, and displace the piece holder such that the solid piece is supported solely by the support system during providing the impact and obtaining the vibrational response.