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In order to reduce the wave excitation forces on structures, the partial porous cylinder, which is composed of a porous part located near free surface and a rigid part bounded top and bottom by impermeable end caps, is newly suggested. The fluid domain is thus divided into three regions: a single exterior region, N inner regions and N beneath regions to calculate the wave force on the partial porous...
This paper presents the improved design of a Coanda Effect Test Bench (CoETB) and its experimental data. The CoETB is primarily setup to investigate the authors' hypothesis that a steerable Coanda effect can be used for flight directional control. The design is currently based on the Unmanned Aerial Vehicle (U.A.V) manufactured by GFS Projects Limited or known as the GFS-UAV. The CoETB experiment...
Hydraulic catapult is a high speed fluid power based launching system and the actuator is a 3-level telescopic cylinder. Limited by the traveling distance of the cylinder, There is no much room left for the cushion process, which leads to the impossible apply of the traditional hydraulic absorber. The structure of the cylinder also makes it impossible to design a cushion structure inside it. In this...
This paper is aimed to model behavior of a magnetorheological (MR) damper under impact loading through polynomial approach. The polynomial model is developed based on curve fitting from experimental results and consists of a three regions namely fluid locking, positive and negative acceleration regions. The experimental results which have been performed using impact test apparatus are evaluated in...
Intramuscular injections are a common medical procedure performed countless times on a daily basis; however the actual procedure of giving an injection is rather complicated and can be intimidating to nursing students new to the medical profession. The instrumented syringe discussed in this paper was conceived as a tool to help train individuals in proper injection procedure and technique. Utilizing...
Full-scale marine current energy converter devices have now been operational for several years. These devices have the potential to provide large scale electricity generation when placed in farms/arrays in areas of fast flowing tidal currents. Now the full-scale concept has been proven experienced operators are in a position to provide array developers with devices for such applications, thus at present...
Physic-based fluid simulation is used extensively nowadays; however the traditional serial algorithm can't satisfy the real-time requirement due to its complexity and computeintensive. The development of modern GPU makes this possible. In this paper, a Smoothed Particle Hydrodynamics (SPH) method for incompressible fluid was implemented using CUDA on GPU. Since the algorithm was executed on the GPU...
The basic principle of fish propulsion with the presence of a solid boundary was studied. The problem of a two-dimensional potential flow over a flexible plate swimming adjacent to a planar wall is treated. This is solved by applying the method of images. The motion of the flexible plate consists of a progressive wave traveling along the body of the plate. The energy imparted to the fluid, the power...
Nowadays, studies of the interventional micro-robots have been hot topics in the field of medical device. The ultimate goal of medical micro robots is to reach currently inaccessible areas of the human body. In this paper, a novel bio-inspired interventional micro-robot in screw-in swim way is presented, which can move along the line, turn at the corner, and spinning. Based on the propulsion mechanism...
Laser trapping in the near infrared regime is a noninvasive and convenient manipulation tool, which can be utilized as micromanipulator for a large number of biological applications. Increasing demands for both accuracy and efficiency in cell manipulation highlight the need for automation process that integrates robotics and tweezers technologies. In this paper, we propose a robotic manipulation system...
The high pressure water jet nozzle is a key part to accelerating abrasive particles. The geometrical model of fluid control volume in front and back nozzle and physical model of particle were established by object oriented fluid flow flied and particle of submerged jet. The results showed that the outlet average velocity of fluid and particle falls down sharply with the particle concentration increasing...
The lift is not be generated on the wings when the water velocity is zero. So the conventional theory is not adapted to the anti rolling ship research at zero speed. And the technology of anti rolling ship at zero forward speed is a kind of new theory. In order to study the process of lift generation of fin stabilizer at zero speed, the model of lift generation of variable chord fin stabilizer is...
This paper deals with the kinematics and dynamics of an in-pipe underwater swimming robot. To provide a basis for the structure design and motion control of the in-pipe swimming robot, the dynamics and kinematics model of 6-DOF spatial motion in a specific three-dimensional pipeline are established. The Dynamics characteristic performances and the needed driving force when the robot swims along the...
The method that fin stabilizer is used to anti rolling ship is different from the conventional theory of anti rolling ship, so it is a kind of new theoretics. In order to study the process of lift generation of fin stabilizer at zero speed, the model of lift generation of fin stabilizer is built based on biomimetic theory such as Weis-Fogh mechanism with variable chord wings by the conformal representation...
Serpentine Locomotion is the most common and simplest locomotion form of a snake-like robot; its main characteristic is the wave-like undulation of the snake's body. In order to realize the noticeable features of the snake-like robot's serpentine locomotion in water, we have developed an amphibious snake-like robot which can adapt to terrestrial and underwater environments. After we derived the dynamic...
In the robotic domain, it is common to deduce and use models that allow translating mathematically the element behavior. In some cases, these would serve as base to determine and develop a controller, for example. Beyond this, the simulation and experiments are reasons that leave to the development of models, becoming evaluation tools of the system behavior, especially when there are constraints of...
We present a method to compute friction in a particle-based simulation of granular materials on GPUs and its data structure. We use Distinct Element Method to compute the force between particles. There has been a method to accelerate Distinct Element Method using GPUs, but the method does not compute friction. We implemented friction into the DEM simulation on GPUs and this leads to the real-time...
In 3D computer graphics, it has been an important issue to describe a virtual object realistically and show it in a physically correct manner. Unlike the virtual reality(VR), the augmented reality (AR) is an environment containing virtual and real objects simultaneously. However, the difference in motion between the virtual and real objects is obvious, which makes it hard for AR to be realistic and...
When dielectric oil is subjected to sufficiently high electric stress, electrons can be injected from the cathode and trapped, whereupon the charged fluid is driven away by the field. Experiments have been carried out into this high stress regime using a repetitive linearly rising and falling voltage ramp resulting in a current flow proportional to a simple power of the value of the applied voltage...
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