Naval Postgraduate School
The effects of shipboard steering machinery dynamics on rudder roll stabilization systems.
effectsofshipboa00wend.pdf (2.197Mb)Abstract
The surface ship rolling motion equation is modeled as a second order system, with
a natural frequency of con — 0.4/.sec and a dimcnsionless damping ratio of £ = 0.08. The
model is subjected to a random forcing function, which has a Gaussian probability distribution
and can be considered as "white noise", and placed into State-Space form. State
variable feedback of roll rate is applied and the system discretized to match digital control.
Roll angle time histories are developed for a range of feedback gains and compared.
Additionally, steering machinery dynamics are modeled by a first order system and time
constants varied to determine the effects of rudder dynamics on the feedback system.
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