STRESS AND DYNAMIC ANALYSIS OF SIMPLE REMOTELY OPERATED UNDERWATER VEHICLE

Document Type : Original Article

Authors

Egyptian Armed Forces.

Abstract

ABSTRACT
Stress and dynamic analyses of submerged structures, especially Remotely
Operated Underwater Vehicles (ROV) are the first step to build and design an
underwater vehicle. In the present paper the high pressure produced form the water
column weight plus the dynamic pressure produced from the vehicle speed is
calculated. The stress affects the structure due to both static and dynamic loads is
obtained. The fulfillment of these analyses needed the use of finite element model
simulating the structure. Stress analysis is made by the finite element package
ABAQUS® version 6.8. The dynamic analysis introduces the equation of motion
representing the dynamic behavior of the vehicle under the effect of the
hydrodynamic load against the vehicle motion. Equations define the added mass
coefficients are used mathematically to estimate the added mass coefficients. The
added mass coefficients are estimated practically by means of a free decay
pendulum motion test. The hydrodynamic coefficients (linear and quadric damping
coefficients,) are determined using the computational fluid dynamic through software
ANSIS CFX. These coefficients are compared by the coefficients estimated
practically by means of a free decay pendulum motion test. Good agreement
between practical and CFD hydrodynamic coefficient is achieved. The variation of
ROV acceleration and velocity with time is obtained for surge and heave directions
with varying thrusting load.

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