Feasibility Evaluation of Photogrammetry versus Coordinate Measuring Arms for the Assembly of Welded Structures

Abstract

The present paper studies the technical feasibility of Photogrammetry and Coordinate Measuring Arms (AACMM or CMA) for the geometrical inspection of welded pins used for the assembly of medium-sized sheetmetal structures. As a result of this evaluation it was found that the deviations (measurement recorded by the device minus the nominal value of the measurement) obtained by means of Photogrammetry and the CMA were equivalent. Moreover, the number of measurements found to be out of tolerance by both methods was statistically equivalent. According to our results both methods are feasible for performing the dimensional inspection of the position of the welded cylinders of the structure as they are able to distinguish measurements inside and outside of tolerance and are equally capable of detecting the data variance.

A reverse engineering approach to measure the deformations of a sailing yacht

“…In particular, close-range photogrammetry is the technique usually used in reverse engineering processes [9]. Many studies have demonstrated that close-range photogrammetry is a very accurate and low-cost method and, in many applications, can have comparable performances to laser scanning methods and coordinate measuring arms [10][11]. For these reasons, close-range photogrammetry, also thanks to recent informatics, technological and software improvements, has become more and more widespread and has been largely used in different application fields (like structural monitoring, engineering and manufacturing, cultural heritage, quantifying landform change, etc.…”

Sensor Prototype to Evaluate the Contact Force in Measuring with Coordinate Measuring Arms

“…CMAs are typically used for contact measurements in short measurement campaigns having few measurands and few workpieces. For instance, they are used for the GD&T quality control of assemblies [ 1 ] with welded or screwed plates and GD&T verification in the field, either at a tool machine table or directly at a production work station as in prototype manufacturing. CMAs are most suitable for companies needing fast measurements in different places, short measurement campaigns or verification of a few relevant measurements and dimensional or geometric tolerances.…”

Prediction of wave transmission coefficient using neural networks and experimental measurements

“…Photogrammetry has been used with increasing intensity to produce such representations for archaeological sites (De Reu et al 2013), geological studies or civil engineering purposes (Nex & Remondino 2012) or even to perform navigation and control for docking in space applications (Blokhinov et al 2012). The accuracy of photogrammetry can be a consideration when involved in survey activities, yet previous studies (Cuesta et al 2012) have demon- ABSTRACT: Visual inspection is an integral part of Condition and Class surveys, with the results comprising of the surveyors' opinion, documented by a sum of pictures indicating areas of interest. Although this way provides the most essential information, the communication of the results may be difficult, since isolated images cannot provide the context.…”