Accession Number : ADA185233

Title :   The Dynamic Controls of a Hydraulic Press by Controlling the Pump Motor.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Effrece, Frank, Jr

PDF Url : ADA185233

Report Date : Jun 1987

Pagination or Media Count : 133

Abstract : With the increasing demand for the accurate control of power, recent studies in the area of modern control theory have concentrated on the design, and application of control systems. This desire to control power has produced interest in hydraulics, especially in the field of manufacturing. There are many unique features of hydraulic systems as compared to electromechanical systems. Hydraulic systems are dramatically stiff when compared to electromechanical drives. This stiffness leads to little drop in the speed of the ram as loads are applied. Using closed-loop systems, this stiffness leads to better position control. Hydraulic systems are also superior to mechanical and electrical systems in that the hydraulic fluid of the system carries away the heat generated by internal losses. This heat is a basic limitation of any machine since it causes lubricants to deteriorate, mechanical parts to seize, and insulation to break down as temperature increases.

Descriptors :   *HYDRAULIC PRESSES, *CONTROL SYSTEMS, HYDRAULIC PRESSURE PUMPS, LOAD CONTROL, MOTORS, HYDRAULIC FLUIDS, HEAT TRANSFER, TURBULENT FLOW, PRESS FORGING, PERFORMANCE(ENGINEERING), SERVOVALVES, VELOCITY, MATHEMATICAL ANALYSIS, THESES

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE