Technical Papers & Journals

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Importance of Holding Fixtures in Aerospace Metrology Francesco Savelli In the realm of aerospace metrology, precise measurement is paramount for ensuring the safety, efficiency, and performance of aircraft components. Holding fixtures play a crucial role in achieving accurate measurements by securely holding the workpiece in place during inspection and testing processes. This abstract elucidates the significance of holding fixtures in aerospace metrology. The paper will outline few case studies of inspection of complex geometry hardware, touch two critical points : Firstly, holding fixtures provide stability and repeatability, minimizing variations in measurement results. By securely clamping or supporting the workpiece, they mitigate the risk of dimensional distortions caused by external forces, such as vibrations or gravitational effects. This stability is indispensable for achieving consistent and reliable measurements, essential for meeting stringent aerospace industry standards.
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Advancements in Portable Metrology for Defense Aircraft Manufacturing Chris Barrow More than a decade ago, I gave my first brief at CMSC on the current state of 3D portable metrology and potential use cases that would benefit defense aircraft manufacturing. Evaluations of many of the state-of-the-art systems at the time were performed to determine what might be best suited to accomplish common tasks like detail part validation, hole inspection, seam validation, and coating thickness measurement. Since that time, these technologies have grown into a critical piece of Lockheed Martin’s digital transformation and I have been fortunate to ride that wave to a Technical Fellowship. This presentation will review my previous study, the deployed applications that followed for F35 and other defense aircraft, lessons learned over the past ten years, and where I see 3D portable metrology being used in the future as those technologies and our aircraft platforms continue to evolve.
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Survey and Alignment for the Advanced Photon Source Upgrade Project William. G. Jansma, Joshua S. Downey, Rolando C. Gwekoh, Altaf A. Khan, Keith B. Knight, Animesh Jain, Samuel P. Jarvis, Jeremy Nudell The Advanced Photon Source (APS) is a synchrotron X-ray facility located at Argonne National Laboratory that has been in operation since 1996. An extensive upgrade to replace the original APS electron storage ring with a state-of-the-art machine was recently completed. The ~1,100-meter circumference storage ring generates X-rays up to 500 times brighter than those created by the original APS. With the new ring completed, focus has shifted to the upgrade and realignment of X-ray beamlines.
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Artifact for testing terrestrial laser scanner for errors arising from target optical properties Braden Czapla, Vincent Lee, Bala Muralikrishnan, Tam Vo, Matthew Winger, Terrestrial laser scanners (TLSs) are a type of coordinate metrology instrument which collects the three-dimensional coordinates of a scene by measuring the range that a laser beam travels and its orientation (azimuthal and elevation angles). TLSs are subject to a variety of error sources, including those which arise in the ranging, measurement of angles, and interaction of the laser beam with the scanned surface. Documentary standards exist which prescribe tests to expose some of those error sources, including ASTM E2938-15, which addresses errors arising from the ranging unit of a TLS, and ASTM E3125-17, which addresses those from any inherent optical misalignments (leading primarily to angular errors) inside a TLS. While ASTM E2938-15 does allow one to scan different materials, it only captures the impact of the materials’ optical properties in aggregate, along with all other sources’ contribution to ranging errors.
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Novel Experimental Testing Beds for the Latest Scanners in Portable Metrology Jose Corona, Chris Greer, Marie Craven The advancements in the field of metrology have significantly improved the capability of scanning equipment. There are a plethora of different types of scanners available on the market with the potential of collecting large volumes of data at...
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Measurement of detailed features as part of large-scale measurement Rehab Khattab, Dr. Edward Morse Various large-scale metrology tools have proven their worth in measuring aircraft (and other) components whose size is measured in tens of meters. The primary output of these measurements is geometry data, such as cross-sectional profiles, the shape of...
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Inspection of Surface Discontinuities on Aerostructures and Other Flight Critical Components Veniamin Stryzheus, Brian Miller, Matthew Chen, Bryan Bramwell, Sabyasachi Basu The inspection of surface discontinuities on aerostructures and other flight critical components is an integral part of aerospace manufacturing because it helps to ensure product safety and quality. Proper identification, measurement, and rework of surface...
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Benefits of Computed Tomography for Three-Dimensional Metrology David Caprio High-performance hardware and intelligent measurement software enable coordinate measuring machines with computed tomography to achieve ever higher accuracies and measuring speeds than conventional CMMs (coordinate measuring machines). This means that...
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Test Plan Creation Best Practices for Metrology Hardware and Software Monica Kirby Rigorous testing is crucial to the functionality, reliability, and the user experience of a system. However, test plans are generally made without clear pass/fail criteria and other important details, making them difficult to repeat. This lack...
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Non-Contact Tooling Uncertainty Analysis Jeffrey Hammond The paper will detail the testing uncertainty analysis of non-contact targets (high contrast black and white targets, 38.1mm Spheres, and 63.5mm spheres). With the combination of non-contact metrology with traditional laser tracker (SMR) measurements the...
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