Load Position Error due to Dimensional Error in Beam Type Load Cell

Abstract

In order to investigate load position errors due to dimensional errors, the strain changes caused by infinitesimal shape altering are calculated by using the three-dimensional finite element method. The strain changes which result in load position errors take place not only in the region of the beam which has been altered, but in all regions where the strain gage has bonded. In the case where the horizontal bending forces rise from a transverse load position movement, being some dimensional errors in the vicinity of one of the strain gage elements, both the local shift of the neutral axis for the bending in that region, and the global deformation due to the asymmetry of beams give rise to error in measurement. From the results presented in this report, particular modes of dimensional error resulting in serious load position errors are charified, so that the accuracy of dimensions to avoid load position errors may be estimated.