We present an application of HUGIN to solve problems related to diagnosis and control of autonomous vehicles. The application is based on a distributed architecture supporting diagnosis and control of autonomous units. The purpose of the architecture is to assist the operator or piloting system in managing fault detection, risk assessment, and recovery plans under uncertainty. To handle uncerta...

Underwater vehicles have been extensively applied to underwater intervention missions instead of human in recent years. As the crucial equipment of underwater vehicles, underwater manipulators typically play an important role in the underwater tasks. Generally, underwater manipulators are operated manually by human with remotely operated vehicles (ROVs). A KORDI ROV with a dual teleoperated man...

This paper presents a new solution for underwater observation, image recording, mapping and 3D reconstruction in shallow waters. The platform, designed as a research and testing tool, is based on a small underwater robot equipped with a MEMS-based IMU, two stereo cameras and a pressure sensor. The data given by the sensors are fused, adjusted and corrected in a multiplicative error state Kalman...

Underwater vehicles that are equipped with an on-board camera can utilize the captured frames to perceive the 3D structure of the ocean floor and thus perform safe underwater self-navigation. The focal length, frame rate and exposure time, which determine the frame capturing process, in association with the speed of the vehicle determine the capabilities of the vision-based navigation system. I...

good dynamics model is essential and critical for the successful design of navigation and control system of an underwater vehicle. However, it is difficult to determine the hydro-dynamics forces, especially the added mass and the drag coefficients. In this paper, a new experimental method has been used to find the hydrodynamics forces for the ROV II, a remotely operated underwater vehicle. The ...

Hydrodynamic coefficients strongly affect the dynamic performance of autonomous underwater vehicles (AUVs). A novel kind of underwater vehicle (Heavier-than-water AUV) with higher density than water is presented, which is different from conventional ones. RANS method and overlapping grids are used to simulate the flow field around the vehicle. Lifts, drags and moments of different attack and dr...

This paper presents a stable schooling scheme for multiple autonomous underwater vehicles (AUVs) where the number of independent actuators for each vehicle are less than the degrees of freedom (DOF). In most of the formation schemes presented so far, the multiple dynamic agents usually have been modeled as particle systems whose motions can be expressed as simple double-integrator. Therefore, t...

Development of a robust autonomous Underwater Robotic Vehicle (URV) is a key element to the exploitation of marine resources. An accurate dynamic model is important for both controller design and mission simulation, regardless of the control strategy employed. In this paper, a dynamic model for an underwater vehicle with an n-axis robot arm is developed based on Kane’s method. The technique pro...