Abstract
This study is aiming at developing a new method of compensation for base vibrations in a weighing system. The weighing system with compensation consists of a beam-type loadcell scale and several compensating bodies with the same loadcells. The output signal of the weighing loadcell, namely weighing signal, is composed of a signal due to the mass to be measured and a noise due to the base vibrations. This report deals with a design problem of the computational circuit in which a compensating signal to eliminate the noise from the weighing signal can be generated. The results obtained in this study are as follows: 1) A new compensation method is developed, which can be applied to six-degree-of-freedom base vibrations of arbitrary waveform. A clear theoretical conclusion is made on the arrangement of loadcells and the computational circuit configuration in the compensating system. 2) The effectiveness of the compensating system is verified by the experiments of measuring mass under two kinds of base vibrations. The experimental result shows extremely high accuracy as can be obtained in the system with compensation, as compared with the system without compensation. 3) Through the above verification process, it is found that the compensation method gives a solution to the low frequency base vibration problem which is difficult to solve by an ordinary filtering technique.
