An expert system for preliminary selection of hydrostatic transmission components
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The selection and sizing of the components for the design of a hydrostatic transmission is a tedious process. Necessary procedures include: analyzing the load profile, choosing a suitable configuration, determining the required size of components, selecting components, evaluating the performance of selected units, and then adjusting or selecting alternate components for improved performance. A. rule-based expert system, called HSTX, was developed to aid the selection and sizing of the major components-- pump, motor, and final drive-- of a hydrostatic transmission. Four types of options were considered. For the first, output speed and torque are both constant. For the second, horsepower output is constant at different speeds. For the third type, the output torque is constant at different speeds. For the last, torque and horsepower outputs can vary over a wide range of speeds. The program selects one of the four combinations of fixed pump and fixed motor, fixed pump and variable motor, variable pump and fixed motor, or variable pump and variable motor to match the desired outputs. The HSTX program includes databases which contain the specifications of hydraulic pumps and motors from selected manufacturers. HSTX interactively prompts the user to enter basic problem constraints and performance requirements. The program then recommends system configuration and selects components from the databases to meet the performance requirements specified. To assist inexperienced designers, HSTX is designed in such a way that the program gives easily understood hints, explanations, and guidance. The program, HSTX, can analyze the load profile, size the components, select available components from a database, evaluate the performance, and output the final results. Trial runs with different operators indicate that HSTX can be effectively used by a designer with a background in hydraulic systems but with little background in HST design.
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