Modelling and system identification of a stiff stay wire fence machine

Type of content
Journal Article
Thesis discipline
Degree name
Publisher
University of Canterbury. Electrical and Computer Engineering
Journal Title
Journal ISSN
Volume Title
Language
Date
2010
Authors
Hann, C.E.
Aitchison, D.
Kirk, D.
Brouwers, E.
Abstract

This paper investigates a severe gear backlash problem encountered in a stiff stay machine that is capable of producing a 26 line fence up to 2.6 metres in height at a speed of 80 stays/minute. Related problems in the literature, typically concentrate on the effect of gear backlash on the ability to control a shaft. However, in this case, very good control of the reference speed of the shaft was maintained in spite of the gear backlash. The problem was that the commanded torques were excessively large and threatened to damage the gear box. This problem motivated a complete analysis of the systems dynamics including the development of a model to better understand the response and allow the identification of external loads on the system. It was found that the method of sensing the shaft position (resolvers) was a major factor as well as the upgrading of the motor which was over responding to disturbances in the shaft. The model was validated using several torque limiting experiments and gave accurate prediction of the machine’s major dynamics. The simulation tool developed provides the basis to predict the effect of different loads, wire types and/or motors on the machine for future designs minimizing the amount of experimentation on the machine.

Description
Citation
Hann, C.E., Aitchison, D., Kirk, D., Brouwers, E. (2010) Modelling and system identification of a stiff stay wire fence machine. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 224(7), pp. 1069-1083.
Keywords
stiff stay machine, gear backlash, system identification, control system
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Field of Research::09 - Engineering::0913 - Mechanical Engineering
Fields of Research::40 - Engineering::4014 - Manufacturing engineering::401408 - Manufacturing processes and technologies (excl. textiles)
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