Uncertainty of coordinate measurements on sheet-metal parts in the automotive industry

Weckenmann, Albert; Knauer, Markus C.; Killmaier, T.

doi:10.1016/s0924-0136(01)00758-0

Cited by 33 publications

(18 citation statements)

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“…In this case, the values obtained during the pressure measurement should be compared with those recommended by the World Health Organization (1999) through the International Society of Hypertension (ISH). The expanded uncertainty associated with the measurement results reduces the specification zone, which generates the conformance zone (Weckenmann et al, 2001).…”

Section: The Uncertainty Calculation Measurementioning

confidence: 99%

An investigative case study at local hospital into the current reliability of blood pressure sphygmomanometers

et al. 2017

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Introduction: Arterial Blood Pressure is a significant indicator of the current health condition of an individual.The correct detection of hypertension is essential, where this health problem is considered as one of the greatest health risks factors that affect the heart and circulatory system. This paper presents the importance of the application of metrological criteria for the diagnosis of hypertension using a sphygmomanometer aneroid. Methods: 72 mechanical aneroid sphygmomanometers were calibrated using a standard manometer and the indication error, hysteresis, air leakage and rapid exhaust were determined; readings of these sphygmomanometers were compared to a properly calibrated and adjusted aneroid sphygmomanometer to carry out pressure measurements as those made during the hypertension diagnosis; the uncertainty of measurement associated with the sphygmomanometers calibration, and pressure values was assessed according to the recommendations of the Guide to the Expression of Uncertainty in Measurement, defined by the Joint Committee for Guides in Metrology. Results: The results obtained have shown that about 61% of the evaluated aneroid sphygmomanometers did not meet the specifications. The variable that most contributed to the final calibration uncertainty was the hysteresis of the standard manometer, with 53% of contribution, followed by the sphygmomanometer resolution with 27%. Conclusion: The periodic verifications are essential to evaluate the performance of these devices. It was shown that uncertainty of measurement influences the final diagnosis of hypertension and the application of metrological criteria can increase the reliability of the final diagnosis.

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Section: The Uncertainty Calculation Measurementioning

confidence: 99%

An investigative case study at local hospital into the current reliability of blood pressure sphygmomanometers

et al. 2017

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“…Task specific uncertainty depends on number of factors such as sampling strategies, measuring object, probing technique, environmental conditions, evaluation software, measuring equipment, etc. [6]. Factors that affect measurement uncertainty of specific task can be categorized into following two categories [7]:…”

Section: Measurement Uncertainties Associated With Cmmmentioning

confidence: 99%

“…For instance, work of Weckenmann et al [6], where contributions of different uncertainties have been identified on CMM measurement results through measurement of car body. A comprehensive review of techniques in which Wilhelm et al [5] estimated task specific uncertainty for CMMs represent significant contribution in this area.…”

Section: Measurement Uncertainties Associated With Cmmmentioning

confidence: 99%

New developments in coordinate measuring machines for manufacturing industries

Mian

Al-Ahmari

2014

Int. J. Metrol. Qual. Eng.

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Abstract. There have been substantial improvements in measurement systems in order to meet fluctuating market demands. This rapid change and development in measurement technology has primarily been governed by demands of accuracy and precision from aerospace, automotive and other manufacturing industries. Coordinate measuring machines (CMMs) available with different technologies and configurations has efficiently been fulfilling customer demands for more than a decade. Though, current CMMs can meet needs of rapid and increased demands of customers to a greater extent but still there is lot of scope for improvement and development in CMMs. The globalization of manufacturing has resulted in development of variety of complex products and miniaturization of mechanical components. The technology of micro/nanoscale 3D measurement is still a bottleneck for industries. Therefore, precise and accurate system which is flexible enough to deal with complexities of parts and micro & nano range products has to be investigated. In this paper, comprehensive review concerning CMMs with capabilities to measure micro/nano features has been presented. This work has also discussed different methods to estimate measurement uncertainty, as well as performance evaluation of CMMs. Moreover, novel concepts such as intelligent CMM, multi-sensor CMM, virtual CMM have been presented.

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“…The effect of forces due to gravity, measuring principle or clamping operations on a deformable object may lead to a significantly higher measuring uncertainty in freeform metrology [183]. The deformation introduced by clamping is more significant for freeform shapes, due to their complexity.…”

Section: Deformation Effectsmentioning

confidence: 99%