Recent studies indicate that bow foil biomimetic systems can significantly improve ship propulsion in waves. In this paper, the DTMB 5415 model is taken as object and a semi-active elastic flapping proposed to install at its underwater position. When sails head wave, heave pitch motion will occur, which drive form motion. According working characteristics of foil, generate forward thrust under ...

Spatial orientation is critical for air operations. Perception of orientation is continuously maintained by accurate information from the visual, vestibular, and somatosensory systems in daily terrestrial activities. The various contributions of these senses can be significantly altered in variable gravitoinertial environments, or when one of the sensory cues is markedly reduced. The visual ori...

Relative navigation of an aircraft (fixed wing or helicopter) close to ships at sea is a unique navigation problem. Shipboard helicopter operations provide a difficult operational environment. Wind over deck and wake turbulence shed by ship super structure offer challenging and unpredictable conditions during takeoff and landing. This is especially true in the operational environment that inclu...

Studies of center of mass (COM) motion are fundamental to understanding the dynamics of animal movement, and have been carried out extensively for terrestrial and aerial locomotion. But despite a large amount of literature describing different body movement patterns in fishes, analyses of how the center of mass moves during undulatory propulsion are not available. These data would be valuable f...

In this study, the hydrodynamic performance of a ship in terms motions and resistance responses calm water regular head waves is investigated for two loading conditions using Fully Nonlinear Potential Flow (FNPF) panel method. The main focus understanding broad range operational conditions. Comprehensive analyses their correlation with wave making including harmonics are presented compared agai...

The results from resistance measurements in calm water and load-varying self-propulsion tests regular head following waves are presented. experimental campaign is conducted the large towing tank at SINTEF Ocean (formerly MARINTEK). openly accessible hull of single screw Duisburg Test Case selected as test case. wave added resistance, ship motions RAOs, axial wake fraction, thrust deduction rela...

There are many occasions where the base of a robotic manipulator is attached to a moving platform, such as on a moving ship, terrain or space shuttle. In this paper a dynamic model of a robotic manipulator mounted on a moving base is derived using both Newton-Euler and Lagrange-Euler methods. The presented models are simulated for a Mitsubishi PA10-6CE robotic manipulator characteristics mounte...

We present the development and application of small buoy systems for wave energy harvesting (free-floating or slackly moored), to produce about 1 KW per unit at full scale. These systems are targeted for powering distributed marine surveillance and instrumentation networks, and should be simple in concept, easily deployable, storm resilient, and low maintenance. Our work involved design, experi...

The six-degree-of-freedom (6 DOF) motion of the mother ship, especially heave motion, brings difficulties to offshore operations and even causes safety accidents. To ensure reliability launch recovery system when active compensation (AHC) function works, its dynamic characteristics are analyzed. Firstly, model with a rigid rope is constructed, mathematical simulation without AHC under excitatio...

In this paper, some recent progress toward the prediction of fully coupled wave-body interactions using a sharp interface immersed-boundary/level-set method is presented. A noniterative strong coupling scheme for the fluid motion and rigid body dynamics is adopted by utilizing a non-inertial reference frame attached to the solid body. The combination of this scheme with the previous immersed-bo...