UB IlmenauIlmenau : Universitätsverlag Ilmenau, 2024. - xxiv, 194 Seiten.
(Berichte aus dem Institut für Maschinen- und Gerätekonstruktion: IMGK ; 41)
DOI 10.22032/dbt.59666
URN urn:nbn:de:gbv:ilm1-2024000040
Zugl.: Dissertation, Technische Universität Ilmenau, 2024
Weighing cells based on compliant mechanisms are the backbone of mass metrology. The mechanical properties of the instruments and their adjustment define the metrological performance. The current work focuses on the design and adjustment of weighing cell mechanisms for a 1 kg vacuum mass comparator application. Three mechanical parameters of the compliant mechanisms define the metrological performance: stiffness, tilt sensitivity and off-center load sensitivity. An entire chapter is devoted to the ultra-thin flexure hinges used in the weighing cell mechanism. It covers their modeling, their manufacturing, and measurement. Starting from the concept level, two weighing cell prototypes were developed, assembled, and tested. Mechanical modeling, ranging from analytical models to finite element models, was used throughout the development. A quasi-independent adjustment of stiffness and tilt sensitivity based on the combination of trim masses was modeled and experimentally verified. A metrological model was used to define the requirements for the robust design of the final weighing cell. It allows the compensation of manufacturing deviations. The implemented adjustment methods were designed to eliminate the mechanical first-order error components of the weighing cell and thus enable a further reduction of measurement uncertainties in the mass comparison process.
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