This paper develops an improved robust multi-surface sliding mode controller for a complicated five degrees of freedom Underwater Vehicle-Manipulator System with floating base. The proposed method combines the robust controller with some corrective terms to decrease the tracking error in transient and steady state. This approach improves the performance of the nonlinear dynamic control scheme a...

This thesis describes the design, modeling, manufacture, and testing of a low cost, multiple degree-of-freedom underwater manipulator. Current underwater robotic arm technologies are often expensive or limited in functionality. The goal of this research is to produce a multiple degree-of-freedom manipulator utilizing relatively inexpensive, commercial off-the-shelf servo motors. This project is...

Underwater vehicle-manipulator (UVM) systems have been suggested for inspection, maintenance, repair and construction of underwater structures. The addition of manipulators to the vehicle makes control of the system more difficult due to the interaction forces between vehicle and manipulator. So, the efficient compensation of those interactions should be considered for accurate control of both ...

A control scheme for the coordinated control of a Sub-sea vehicle/manipulator system is presented. The unit quaternion representation is used in a singularity free representation of the attitude. The control scheme is formulated in a 12 d.o.f. task space and only position measurements are required. The performance is evaluated by simulation with a realistic model of a commercial underwater vehi...

This paper presents a control scheme for obtaining high maneuverability of underwater robot manipulators mounted on a remotely operated vehicle (ROV). The motions of an underwater manipulator can affect the attitude and position of the ROV which should remain stationary in seabed operation. To compensate for the dynamic effect of the underwater manipulator on the ROV, force-torque (F/T) informa...

This paper presents a control scheme,for obtaining high maneuverability of underwater robot manipulators mounted on a remotely operated vehicle (ROV). The motions of an underwater manipulator can aflect the attitude and position of the ROV which should remain stationary in seabed operation. To compensate for the dynamic effect of the underwater manipulator on the ROY force-torque (F/T) informat...

Control of Underwater vehicle manipulator systems (UVMS) are limited to human intervened tele operation in almost all practical applications. Extending these missions to autonomous or semi autonomous operation requires accurate dynamic modeling of the system. Such modeling assists system design and controller testing of autonomous UVMS. The study performs a dynamic analysis to capture relative ...

In underwater remote vehicle-manipulator system (URVM) applications, it is beneficial to have the underwater remote vehicle (URV) hold station using its thrusters while a human pilot operates the serial manipulator. This provides a stable platform for the manipulator and eases the pilot’s job drastically when current and/or tether disturbances are present. The contribution of this work is twofo...

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 has proposed a method of grasping a model-known object autonomously for an Underwater Vehicle-Manipulator System (UVMS) using monocular vision. The distance between the vehicle and the object is estimated by extracting the pixel radius of the ball-like object, and the vehicle’s depth and orientation angle are used to keep the vehicle’s station while the manipulator is performing the ...