scholarly journals Comparison of in-line and off-line measurement systems using a calibrated industry representative artefact for automotive dimensional inspection

Measurement ◽  
2020 ◽  
Vol 163 ◽  
pp. 108027
Author(s):  
Ercihan Kiraci ◽  
Arnab Palit ◽  
Michael Donnelly ◽  
Alex Attridge ◽  
Mark A. Williams
Author(s):  
Lorenzo Motta ◽  
Paolo Novelli ◽  
Philippe Darcis ◽  
Mariano Armengol ◽  
Federico Tintori

The paper describes the laser pipe end measurement systems developed by Tenaris to perform the automatic dimensional inspection of pipe ends (measuring OD, ID, WT) and the software’s applications which analyze the collected data. The measurements performed by the Laser End Measurement System (LEMS) can give great advantages to end users and laying companies allowing a more efficient pipe alignment prior welding. This is of particular importance in offshore oil recovery industry, where the fatigue requirements of pipelines subject to high dynamic loads are continuously increasing, as the exploitation is moving in harsh environments. Fatigue is normally the limiting design criterion for products like Steel Catenary Risers (SCRs) or fatigue sensitive flowlines, and it represents its major engineering challenge. One way to minimize the risks of girth welds’ fatigue failure is to minimize the pipes abutting Hi-Lo [1,2]. This task could be accomplished by the use of laser pipe ends measurements analyses in conjunction with dedicated software. This paper provides details on the implementation and validation processes of automatic measurement systems (fixed and portable) to determine pipe ends dimensions with precision and repeatability. In addition, the features and the capabilities of the fit-for-purpose to the end user automatic applications are showed. These features include the Best Matching (search of the alignments which minimize pipes abutting Hi-Lo), the Counter-Boring (analysis of the best ID/OD to which machine the pipe ends counter-bore and of the forecast of the machined WT after counter boring), and the sorting in families (determination of pipes groups according to their ID/WT/OD tolerances).


1993 ◽  
Vol 115 (1) ◽  
pp. 85-92 ◽  
Author(s):  
J. Ni ◽  
S. M. Wu

A hybrid on-line and off-line measurement technique is developed for machine volumetric error compensation based on a multiple-degree-of-freedom laser optical system. When implemented on a 3-axis machine up to 15 geometric error components can be measured simultaneously on-line and the remaining 6 components need to be calibrated off-line. Since the on-line measurement systems use different metrology bases, a modified volumetric error model is derived for a milling machine by considering the measurement features of the multiple-degree-of-freedom system. Through experimental tests, it was found that the discrepancy between the identified errors and the actual errors was less than 4 μm out of a maximum range of 20 μm.


2020 ◽  
Vol 225 ◽  
pp. 08001
Author(s):  
M. Chebbi ◽  
D. Doizi ◽  
L. Manceron ◽  
A. Perrin ◽  
J. Vander Auwera ◽  
...  

A severe nuclear accident may induce a dramatic dissemination of radioactive species into the environment. In that respect, improving the nuclear safety remains an important challenge to improve the society acceptability towards this energy. A solution may consist on implementing robust and reliable measurement systems operating near the Containment Venting Systems (CVS). These devices should be able to provide real time monitoring of the emitted fission products (FPs) in the course of a hypothetical accidental sequence. In the present study, a peculiar attention was devoted to iodine species (namely CH3I) measurement by complementary techniques (photoacoustic spectroscopy and gas chromatography). The most important results will be described here.


2020 ◽  
Vol 110 (09) ◽  
pp. 629-633
Author(s):  
Berend Denkena ◽  
Marc-André Dittrich ◽  
Martin Winkler ◽  
Sebastian Kaiser

Im Rahmen des vom BMBF (Bundesministerium für Bildung und Forschung) geförderten Projekts „TempoPlant“ wird eine teilautonome Fertigungszelle für die Herstellung orthopädischer Implantate erforscht. Dabei wird ein Bearbeitungszentrum mit Messtechnik zur Qualitätskontrolle und Prozessüberwachung ausgestattet. Die gewonnenen Daten werden für die Prozessüberwachung, die Qualitätsregelung und die Dokumentation entsprechend den Richtlinien der Medical Device Regulation (MDR) genutzt.   As part of the research project TempoPlant, funded by the BMBF (Bundesministerium für Bildung und Forschung), a semi-autonomous manufacturing cell for production of orthopedic implants is being investigated. For this purpose, a machining center is equipped with in-line measurement systems for process forces and the component’s geometry. The acquired data will be used for process monitoring, quality control and documentation according to the guidelines of Medical Device Regulation (MDR).


Author(s):  
John F. Mansfield ◽  
Douglas C. Crawford

A method has been developed that allows on-line measurement of the thickness of crystalline materials in the analytical electron microscope. Two-beam convergent beam electron diffraction (CBED) patterns are digitized from a JEOL 2000FX electron microscope into an Apple Macintosh II microcomputer via a Gatan #673 CCD Video Camera and an Imaging Systems Technology Video 1000 frame-capture board. It is necessary to know the lattice parameters of the sample since measurements are made of the spacing of the diffraction discs in order to calibrate the pattern. The sample thickness is calculated from measurements of the spacings of the fringes that are seen in the diffraction discs. This technique was pioneered by Kelly et al, who used the two-beam dynamic theory of MacGillavry relate the deviation parameter (Si) of the ith fringe from the exact Bragg condition to the specimen thickness (t) with the equation:Where ξg, is the extinction distance for that reflection and ni is an integer.


2012 ◽  
Vol 82 (3) ◽  
pp. 216-222 ◽  
Author(s):  
Venkatesh Iyengar ◽  
Ibrahim Elmadfa

The food safety security (FSS) concept is perceived as an early warning system for minimizing food safety (FS) breaches, and it functions in conjunction with existing FS measures. Essentially, the function of FS and FSS measures can be visualized in two parts: (i) the FS preventive measures as actions taken at the stem level, and (ii) the FSS interventions as actions taken at the root level, to enhance the impact of the implemented safety steps. In practice, along with FS, FSS also draws its support from (i) legislative directives and regulatory measures for enforcing verifiable, timely, and effective compliance; (ii) measurement systems in place for sustained quality assurance; and (iii) shared responsibility to ensure cohesion among all the stakeholders namely, policy makers, regulators, food producers, processors and distributors, and consumers. However, the functional framework of FSS differs from that of FS by way of: (i) retooling the vulnerable segments of the preventive features of existing FS measures; (ii) fine-tuning response systems to efficiently preempt the FS breaches; (iii) building a long-term nutrient and toxicant surveillance network based on validated measurement systems functioning in real time; (iv) focusing on crisp, clear, and correct communication that resonates among all the stakeholders; and (v) developing inter-disciplinary human resources to meet ever-increasing FS challenges. Important determinants of FSS include: (i) strengthening international dialogue for refining regulatory reforms and addressing emerging risks; (ii) developing innovative and strategic action points for intervention {in addition to Hazard Analysis and Critical Control Points (HACCP) procedures]; and (iii) introducing additional science-based tools such as metrology-based measurement systems.


Author(s):  
Leonard Bickman ◽  
Barry Nurcombe ◽  
Clare Townsend ◽  
Madge Belle ◽  
James Schut ◽  
...  

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