Date of Award

Spring 1987

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)


Mechanical Engineering

First Advisor

Elkouh, A. F.


Hydraulic lift cylinders are used to raise or push objects from one position to another. In one specific application, a lift cylinder will raise a hospital patient. Since a reciprocating pump is used to raise the cylinder, the peak pressures and maximum cylinder velocity could become excessive. Thus it is desired to dynamically model the hydraulic lift cylinder and theoretically calculate the cylinder pressure, velocity, and displacement versus time. This thesis presents the development of a method to dynamically simulate a hydraulic lift cylinder. An orifice with an accumulator or hydraulic hose are employed to limit the peak cylinder velocities and pressures. The simulated results are then compared to an actual accumulator and hose hydraulic lift cylinder system. Al though the dynamic computer simulation program development is for use in a particular application (a Patient Transport System used in magnetic resonance imaging) the methods and principles presented here may be used for other projects.



Restricted Access Item

Having trouble?