床振動環境下における高速高精度質量計測について

多項式近似モデルを用いた動特性補償手法の提案

抄録

This paper concerns the problem of the fast and high accurate mass measurement under the conditions of floor vibration. A specific type of weighing machine, which consists of a weighing loadcell and the dummy loadcell to cancel the undesirable influence from floor vibration, is considered. To improve the accuracy of mass measurement, it is necessary to compensate the difference in dynamics between the two loadcells. For this purpose, a mass measuring algorithm, which makes use of the numerical model of a loadcell, was proposed in the previous paper. The numerical model is obtained on the assumption that the loadcell is regarded as a spring-mass system of 1 degree of freedom. However, there are also some cases where the differences in dynamics between the two loadcells may not be compensated correctly even if the proposed algorithm is used, because the assumption may not be satisfied. Therefore, in order to compensate the difference in dynamics between the two loadcells correctly, a new algorithm, which uses the approximate model of polynomial function, is described in this paper. The effectiveness of the new algorithm is certified by experiment.