Don Spencer

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Composite materials are increasingly used in rotorcraft structures to reduce weight and improve efficiency. The rotorcraft industry is constantly in need of higherperformance materials that offer improved mechanical strength and stiffness at a lower weight. In polymer-matrix composite structures, matrix-dominated failures impose severe limitations on(More)
Many i n s t r u c t o r s h a v e t h o u g h t o f some day w r i t i n g a t e x t b o o k b u t do n o t know how to go a b o u t i t . A number o f c o n s i d e r a t i o n s become i m p o r t a n t a t d i f f e r e n t s t a g e s o f t h e a u t h o r i n g and p u b l i s h i n g p r o c e s s . Of p a r t i c u l a r i m p o r t a n c e t o b e(More)
This paper presents a solution to the problem of Dynamic Positioning of vessels in Arctic environments, using a finite-horizon optimal control based approach. As the first step, an Unscented Kalman Filter (UKF) based non-linear observer is developed for estimating both the vessel states and unknown inputs such as ice load. To perform better set point(More)
This paper presents a solution to the problem of dynamic positioning (DP) of vessels in ice-infested environments using a nonlinear observer and a finite-horizon optimal control-based approach. An unscented Kalman filter-based nonlinear observer is developed to estimate both the vessel states and the unknown inputs, such as the ice load. To perform better(More)
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