Dynamic mass measurement in checkweighers using a discrete time-variant low-pass filter

Przemysław Pietrzak; Michał Meller; Maciej Niedźwiecki

doi:10.1016/j.ymssp.2014.02.013

Dynamic mass measurement in checkweighers using a discrete time-variant low-pass filter

Abstract

Conveyor belt type checkweighers are complex mechanical systems consisting of a weighing sensor (strain gauge load cell, electrodynamically compensated load cell), packages (of different shapes, made of different materials) and a transport system (motors, gears, rollers). Disturbances generated by the vibrating parts of such a system are reflected in the signal power spectra in a form of strong spectral peaks, located usually in the lower frequency range. Such low frequency components overlap in the frequency domain with the useful signal and it is very difficult to eliminate them. The conventional way of suppressing disturbances is via low-pass filtering of the signal obtained from the load cell. However, if the speed of the conveyor belt is high, the response of the applied filter may not settle fast enough to enable accurate weighing of objects in motion, i.e., without stopping them on the weighing conveyor. Since attempts to overcome this problem using classical linear time-invariant low-pass filtering fail for high belt speeds, the paper presents and verifies experimentally a new approach, based on time-variant low-pass filtering. It is shown that, when properly tuned, the proposed time-variant filter fulfills the measurement accuracy requirements for a wide range of operating conditions.

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Authors (3)

Przemysław Pietrzak
- West Pomeranian University of Technology Department of Control and Measurement
Michał Meller dr hab. inż.
Maciej Niedźwiecki prof. dr hab. inż.

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DOI:: Digital Object Identifier (open in new tab) 10.1016/j.ymssp.2014.02.013
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Details

Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: MECHANICAL SYSTEMS AND SIGNAL PROCESSING no. 48, edition 1-2, pages 67 - 76,
ISSN: 0888-3270
Language:: English
Publication year:: 2014
Bibliographic description:: Pietrzak P., Meller M., Niedźwiecki M.: Dynamic mass measurement in checkweighers using a discrete time-variant low-pass filter// MECHANICAL SYSTEMS AND SIGNAL PROCESSING. -Vol. 48, iss. 1-2 (2014), s.67-76
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.ymssp.2014.02.013
Verified by:: Gdańsk University of Technology