Vibration-Based Powder Detection in Additive Manufacturing
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Solution Overview
Problem
Current non-destructive testing methods for additively manufactured parts, such as x-ray computed tomography, are expensive, time-consuming, and ineffective for detecting excess powder, especially in large or dense parts, often requiring destructive testing and failing to penetrate materials sufficiently.
Innovation Solution
A system and method that excites an additive manufacturing build platform with an input mechanism to induce a dynamic response in parts, senses this response using an output mechanism, and compares it to a reference to identify and quantify excess powder, allowing for non-destructive testing in-situ or near-situ without direct contact or external damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If x-ray computed tomography is used for non-destructive testing, then parts can be tested without destruction, but the testing process becomes expensive and time-consuming
Solution Approach 1:
The patent replaces complex x-ray computed tomography systems with a simple mechanical vibration-based testing system. The system uses a vibration source to excite the part and sensors to detect dynamic responses, eliminating the need for expensive and time-consuming x-ray imaging while maintaining non-destructive testing capability.
Solution Approach 2:
The patent changes the testing approach from static x-ray imaging to dynamic vibration analysis. By measuring frequency, amplitude, and phase parameters of the part's response to vibration excitation, the system可以快速识别缺陷并评估材料特性, significantly reducing testing time while keeping parts intact.
2Measurement precision
If x-ray computed tomography is used for testing, then parts can be inspected, but it is ineffective for large or dense parts due to insufficient microwave penetration
Solution Approach 1:
The patent replaces electromagnetic radiation (x-rays and microwaves) with mechanical vibration waves for testing. Mechanical vibrations can effectively penetrate large and dense materials, overcoming the penetration limitations of electromagnetic methods while maintaining defect detection accuracy through analysis of dynamic response characteristics.
3Measurement precision
If destructive testing is used to determine excess powder, then accurate measurement is achieved, but the part must be broken apart
Solution Approach 1:
The patent replaces destructive physical breakdown with non-destructive vibration analysis. By measuring changes in the part's dynamic response caused by excess powder and comparing them to reference values, the system can accurately quantify powder content while preserving part integrity.
Solution Approach 2:
The patent creates a virtual model of the part's expected dynamic response and compares it with actual measurements. This allows indirect measurement of excess powder through the part's vibrational characteristics without physically breaking the part, maintaining both accuracy and integrity.
4Measurement precision
If x-ray computed tomography is used, then testing can be performed, but each part must be removed from the build platform and tested individually
Solution Approach 1:
The patent creates a universal testing system that can evaluate multiple parts simultaneously while they remain on the build platform. The vibration-based method allows batch testing of entire builds, eliminating the need to remove and individually test each part, thereby significantly improving productivity.
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 efficient and quick detection and prediction of excess powder in additively manufactured parts, reducing testing time and cost while maintaining accuracy, even for large or dense materials, by analyzing the dynamic response's frequency, amplitude, and phase relative to a reference, facilitating in-situ testing and minimizing external influences.
Implementation Method 1
exciting, via an input mechanism, the part by using an excitation force to induce a dynamic response in the part
Implementation Method 2
sensing, via an output mechanism, the dynamic response in the part
Data Source
AI summary
A system and method of testing a part manufactured using an additive manufacturing process. The part may be excited via an input mechanism that imparts an excitation force on the part to induce a dynamic response in the part. An output mechanism may be used to sense the dynamic response in the part. A processing element may be used to compare the dynamic response with a reference to identify an indication of excess powder in the part.