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Improvement of screw press production in palm oil using fuzzy logic system

Othman , Wan Zulkarnain (2008) Improvement of screw press production in palm oil using fuzzy logic system. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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A screw press machine is used to compress the fruit mash between the main screw and the travelling cones to extract the palm oil. The position of the cones against the discharge end of the press cage determines the pressure. The pressure controller is an important factor in determining the oil loss and nut breakages. A conventional control system which is the band control system, uses a kilowatt meter as a controller in adjusting the press cage pressure. However, the screw press machine can be improved in order to reduce the oil loss and nut breakages. Not much researches has been conducted on reducing the nut breakages as well as oil loss. Therefore, the objective of this study is to minimise the oil loss and broken nuts. The objective can be achieved through upgrading the screw press machine and the use of fuzzy control system. During the course of this research project, the hydraulic system of the screw press machine was upgraded by utilising the proportional pressure relief valve. A current transducer was used to measure the motor current load. A ladder diagram program and fuzzy logic algorithm were written and downloaded into the programmable logic control to regulate the press cage pressure. For comparison purposes, a band control system and fuzzy control system were implemented in the control environment. The performances of both systems were compared in a number of tests. The first test was the oscillation of motor current load with the performance of fuzzy control system that was stabilised at 8.33mA. This is due to the reaction of fuzzy pressure controller in regulating the proportional pressure relief valve. The fuzzy control system is able to reduce 1.20% of oil loss compared to tiie band control system. The percentage of the broken nuts of the fuzzy control system was reduced by 3.55%. This implies that the objective to reduce the breakages is achieved. Thus, the screw press machine with a fuzzy control system is found to be significantly more efficient than the band control system.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery
Depositing User: Ms Aryanti Ahmad
Date Deposited: 06 Apr 2011 01:23
Last Modified: 29 Apr 2011 06:41
URI: http://eprints.uthm.edu.my/id/eprint/819
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