Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278450
Title: Instrumentation and control for precision grinding machines
Author: Orton, P. A.
Awarding Body: Nottingham Polytechnic
Current Institution: Nottingham Trent University
Date of Award: 1990
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Abstract:
This thesis examines the present methods of centre less bearing grinding, with a view to applying IIDderncontrol nethods in order to reduce the distribution of output size variations and improve the quality of surface finish. Established rrodels of the grinding process shew that various inportant parameters describing the process can be derived, providing that the grinding power can be accurately rronitored. Several alternative control strategies based on paNer rronitoring are considered. The drive systems of a typical grinding machine are rrodelled as they react through the non-linear grinding wheel/work interface. A simplified computer simulation of the process is demonstrated. Suitable rrethods of instrumentation are evaluated including the optical shaft encoder as a source of high resolution data for the estimation of drive shaft dynamics. A method is devised for on line pararreter estimation of the drive system transfer functions. This enables the important grinding power to be estimated fran shaft dynamics and also al loes the rronitoring of the drive system parameters. The cpt.ica l shaft encoder is also assessed as the source of data for vibration detection. A development conputer with real tine multi-tasking operating system software and specialised shaft encoder interfacing has been established as a basis for an expandable control and rronitoring system. A plan for feeackcontrol of the grinding, involving several separate control algorithms cormunicating with an expert system executive controller, is outlined.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.278450  DOI: Not available
Keywords: Control systems & control theory Automatic control Control theory Machinery Tools Manufacturing processes
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