Browsing by Author "De Silva, CW"

Now showing 1 - 2 of 2

item: Article-Abstract
An Intelligent Supervisory Control System For A Fish Processing Workcell
De Silva, CW; Wickramarachchi, N
A laboratory workcell has been developed for fish cutting. The workcell, which uses a variety of sensors, actuators, and hardware for component interface and control, operates with the help of a dedicated supervisory control system. A layered architecture has been used for the system. It has several knowledge-based modules for carrying out tasks such as workcell monitoring, controller tuning, workcell conditioning, and product quality assessment. The paper describes the workcell and the intelligent supervisory control system. Performance of the supervisory system is studied through fish cutting experiments
item: Article-Abstract
An Investigation of the Effects of Fuzzy Resolution on Control Inference Using Explicit Relationships
Wickramarachchi, N; De Silva, CW
The number of partitions or fuzzy states that exist in a fuzzy variable determines the resolution of that variable. This paper investigates the effect of fuzzy resolution on the control action that is derived from a fuzzy-control rulebase. First, it is shown that some explicit relationships could be derived for the inference from a fuzzy rulebase in terms of input variables and known geometry of the membership functions. These relationships are established for a generic, single-input-single-output (SISO) fuzzy control rulebase that employs uniform triangular membership functions. Specifically, a formula for control action u is derived in terms of incremental input variable and corresponding membership grades and fuzzy resolution. The result is then extended to include global variations of the input variable. It is argued that the resulting equations could be used to demonstrate the applicability of fuzzy control rules in a wide variety of control situations. Also some useful properties that arise from these equations are identified