Abstract
An expert system was developed to assist in the selection and proper use of spray nozzle tips. The expert system selected up to three appropriate nozzles for a user-specified application, identifying one selection as a Best Choice and two selections as optional Good Choices. The performance of the expert system on an IBM-PC XTTM was evaluated against the manual selections of five upper-division agricultural mechanization undergraduates. Whereas the expert system rapidly made correct recommendations in less than 6 sec, the students required an average of 30 min. Fifty percent of the students selections were either incorrect, or an incorrect operating procedure was specified. The results of the students manual selection tests demonstrated the initial complexity of correct nozzle selection for the novice or infrequent user. Although the manual selection process is not difficult for a person possessing a moderate amount of mathematical skills, the process requires familiarity. This complexity may lead to the introduction of errors if manual nozzle selection is infrequent.
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