On the Fast and High Accurate Mass Measurement under the Conditions of Floor Vibration. On the Method of Compensating the Difference in Dynamics without On-line Identification.
Jianxin Sun, Yoshihiro Fujioka, Toshiro Ono, Takeyoshi Nagao, Toru Kohashi · Journal of the Japan Society for Precision Engineering · 1998
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. Since the weighing machine is usually used under the condition that the components of floor vibration are located in low frequency range, it is difficult to measure mass value rapidly by using conventional low-pass filters in this case. The two loadcells have the difference in dynamics, and the difference makes the measuring uncertainty worse. In the earlier paper, the concept of the relative dynamic compensation is applied to the problem of reducing the measuring uncertainty even in the case where the difference in dynamics between loadcells exists. The mass measuring algorithm in the paper, however, needs on-line identification in order to get the information of the difference in dynamics. It takes 40 ms to determine the parameters of a suitable compensating filter with on-line identification. However, there are mass measuring systems that require a faster mass measuring algorithm. Therefore, a new mass measuring algorithm, which is faster than the algorithm with on-line identification, is described in this paper. The effectiveness of the algorithm is certified both by simulation and by experiment.