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Full-Text Articles in Mechanical Engineering

Light Actuated Remote Control Security System, Jack C. Klaus, Larry D. Schroeder, Vincent H. Casteel, Kenneth E. Schwartz Oct 1983

Light Actuated Remote Control Security System, Jack C. Klaus, Larry D. Schroeder, Vincent H. Casteel, Kenneth E. Schwartz

Iowa State University Patents

A remote control security apparatus includes a lock element movable between locked and unlocked positions by an electrically actuated power device. The operator is provided with a portable transmitter adapted to generate light which is interrupted at a predetermined frequency so as to produce an encoded light signal. This signal is detected by a light transceiver which generates an independent signal at the same predetermined frequency and which compares the frequencies of the detected signal and independent signal. If these frequencies are substantially the same, the transceiver actuates the power means to move the lock element to its unlocked position ...


Stability Analysis Of Closed Surge Tanks By Phase-Plane Method, Mostafa A. Sabbah Jan 1983

Stability Analysis Of Closed Surge Tanks By Phase-Plane Method, Mostafa A. Sabbah

Civil & Environmental Engineering Theses & Dissertations

The governing equations describing water level oscillations in a closed surge tank with compressed air at the top of the tank are a set of nonlinear ordinary differential equations if the hydraulic system is analyzed as a lumped system. These oscillations are stable or unstable depending on the parameters of the plant and the type and magnitude of the disturbance.

The present available stability criterion has been developed by linearizing the governing equations and is, therefore, valid only for small disturbances.

In the research reported herein, the governing equations are normalized to reduce the number of parameters from nine to ...