Static behavior of weighing cells
<p>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 enhan...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-11-01
|
| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | https://www.j-sens-sens-syst.net/7/587/2018/jsss-7-587-2018.pdf |
| Summary: | <p>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.</p> |
|---|---|
| ISSN: | 2194-8771 2194-878X |