Tilt Sensitivity Modeling of a Monolithic Weighing Cell Structure

Darnieder, Maximilian; Fröhlich, Thomas; Theska, René

doi:10.1007/978-3-030-16423-2_24

Cited by 2 publications

(1 citation statement)

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“…This results in a separation of the force F S6 into its spatial components, of which only the z component is measured. This leads to a cosine deviation of the weighing result for both tilt axes and proportional to the force of the actuator (Darnieder et al, 2018):…”

Section: Methodsmentioning

confidence: 99%

Static behavior of weighing cells

Darnieder

Pabst²,

Wenig³

et al. 2018

J. Sens. Sens. Syst.

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Abstract. Compliant mechanisms in precision weighing technology are highly sensitive mechanical systems with continuously rising demands for performance in terms of resolution and measurement uncertainty. The systematic combination of adjustment measures represents a promising option for the enhancement of weighing cells which is not yet fully exhausted. A novel adjustment concept for electromagnetic force compensated weighing cells designed for 1 kg mass standards is introduced. The effect on the mechanical behavior is analyzed in detail using a planar compliant mechanism with semi-circular flexure hinges. Design equations for a first layout of the mechanical system are derived from a linearized rigid body model. Existing adjustment concepts for the stiffness characteristic and the sensitivity to quasi-static ground tilt are included. They are extended by the novel approach to attach trim weights to the levers of the linear guide. Based on this concept, an optimal design for the weighing cell is determined. The comparison with a finite element model reveals further effects given by the more precise description of the mechanical behavior. By parametric studies of the adjustment parameters in the mechanical models, it is shown that the stiffness and tilt sensitivity can be reduced significantly compared to the non-adjusted weighing cell. The principal correlation of the trim weights and their effect on the mechanical properties is experimentally verified using a commercially available weighing cell.

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Section: Methodsmentioning

confidence: 99%