Dissertations and Theses @ UNI


Open Access Dissertation


Masts and rigging--Design and construction; Radar--Equipment and supplies--Design and construction;


This experimental research focused on four areas: (a) the design of a new procedure for imitating the dynamic behavior of an electronic base plate on a radar mast system; (b) determination of a reasonable oscillation modal state; (c) avoidance of the destruction of the ability of the radar on the mast of a ship to receive and analyze incoming signals; and (d) design of a vibration absorber and vibration isolator based on an oscillation frequency. An adapted design for the vibration absorber and vibration isolator contributed to the prevention of excessive amplitude being produced by random forces acting upon a radar system equipped on the mast of a ship.

In this research, finite element analysis was used to analyze the natural frequency and the modal state of the ship's mast in order to establish the reasonable finite element analysis model. This technique became the basis for the design of the adapted vibration isolator and the vibration absorber. In designing the adapted dynamic vibration absorber and vibration isolator, the Lagrange's engineering mathematical equation was used to study the system movement equation under differing random forces. This system movement equation led to the converted function between the radar replacement alteration and the random force. By use of a Lagrange's optimum value method, the researcher obtained the optimum frequency modulation ratio and the optimum damping ratio of the dynamic vibration absorber so that the radar displacement alteration reached the minimum value. The optimum mass ratio between the vibration absorber and the radar base plate was located by studying the radar displacement alteration under its optimum dynamic absorber. The optimum frequency modulation ratio and the optimum damp ratio were determined by studying the effect of the spring constants of the vibration isolator, the damp ratio, and the position of the random force. The radar oscillation before and after installing the optimum dynamic absorber were compared to illustrate the accuracy of the field test for sea travel.

Year of Submission


Degree Name

Doctor of Industrial Technology


Department of Industrial Technology

First Advisor

John T. Fecik, Chair

Second Advisor

Charles D. Johnson, Co-Chair

Date Original


Object Description

1 PDF file (x, 128 pages)



File Format