Numerical simulations have been used to study the fluid dynamics associated with flapping flight modes of single as well as paired wings. The numerical solver employed is based on a sharp-interface, Cartesian grid method that allows us to simulate flow with moving boundaries on stationary Cartesian grids. Here, the simple case of normal hover is examined and the thrust production and vortex dyn...

The Unmanned Underwater Vehicle (UUV) designed at the Mechanical Engineering Department of the University of Canterbury is in an early stage of development. With the design of the AUV completed, the primary focus now is to design control software. The control software has to be able to stabilize the vehicle at a desired position and let the vehicle follow a desired trajectory within a reasonabl...

A considerable part of the global pool of terrestrial carbon is stored in high latitude soils. In these soils, repeated cycles of freezing and thawing creates soil motion (cryoturbation) that in combination with other cryogenic disturbance processes may play a profound role in controlling the carbon balance of the arctic soil. Conditions for cryogenic soil processes are predicted to dramaticall...

Abstract Current paper focuses on the laboratory experiments performed wit aim to test deformation in frozen loam soil specimens. Loam soils are subject external effects, such as climate and environmental impacts including temperature changes. Soil heave is one of key features restraining possible area development: construction buildings, roads railways. Necessarily, this requires improvements ...

the stochastic models for ship heave motion in irregular sea waves based on white and colored noises are examined. for this purpose the deterministic model transfers to stochastic models by adding different noise terms in force and then these models are solved analytically and numerically. finally an investigation is undertaken to examine the parameter estimation problem of second order stochas...

Abstract The hydrodynamic characteristics are crucial for accurately analysing floating offshore wind systems. In this paper, the added mass and damping coefficients of a semisubmersible floater examined around natural periods surge, heave, pitch motion, using computational fluid dynamics (CFD). OpenFOAM CFD setup is validated against experimental measurements from free decay tests, same used t...

This paper presents a survey of neural network controllers for AUVs. A direct adaptive neural net controller incorporating integral action was designed for the heave motion of the ODIN underwater vehicle. The neural net controller is trained on-line by parallel recursive error prediction method and the critic equation. The influence of the various design parameters of the neural net controller ...

The patient was a 23-year-old white man with Down’s syndrome who was referred to us for evaluation of a heart murmur which had been present since birth. Physical examination revealed a well nourished acyanotic white man (height 5’4”, and weight 110 lb) with typical Down’s facies and a short and slightly webbed appearing neck. The carotid arteries had good upstroke (no bruits), extremities revea...