Pump adjustment system design for displacement control
Abstract
One of the key enabling technologies required for successful commercialization of displacement controlled (DC) systems are the appropriate variable displacement pumps. This thesis aims to fill the current gap in literature with respect to the performance requirements of pumps used in DC systems as well as create a methodology to ensure a compact, low power, and low cost pump adjustment system design. This research looks both at the design considerations with respect to the individual components and the system as a whole. Also for the first time a measurement based approach is taken to specify the dynamic requirements of DC pumps. Looking at the components a new sensor technology is presented including initial proof of concept measurements. The ideal valve configuration is presented as a slightly underlapped 3 position 4 port valve. Also a detailed qualitative analysis is presented about the swash plate centering mechanism showing which general configuration best meets the criteria for DC pumps considering compactness and performance. With respect to the complete system a detailed hydraulic and kinematic model is presented. This model is used in a full factorial design of experiments to discover the system effects of sizing the control valve, control cylinder, lever arm and control pressure associated with the adjustment system. Additionally a methodology for sizing coupled components to satisfy pump response, pump power, and pump size requirements is detailed along with a general case study.
Degree
M.S.M.E.
Advisors
Ivantysynova, Purdue University.
Subject Area
Mechanical engineering
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