Adaptive hybrid visual servoing/force control in unknown environment
نویسندگان
چکیده
This paper describes an adaptive hybrid visual servoing/force controller to realize visual servoing while the manipulator exerts contract force on a surface. The proposed controller has a hybrid structure of visual servoing control and force control. Because it has an on-line estimator for the parameters of the cameramanipulator system and the one for the parameters of the unknown constraint surface, it only needs a priori knowledge on the manipulator kinematics and nothing any more. First, we propose an estimator for an image Jacobian matrix which describes the relation between image features and the tip position/orientation of the manipulator. Second, a method to estimate the normal vector of the unknown constraint surface is introduced. Then, an adaptive hybrid visual servoing/force controller is proposed. Finally, experimental results are shown to demonstrate the effectiveness of the proposed scheme.
منابع مشابه
Hybrid Adaptive Vision - Force Control for Robot Manipulators Interacting with Unknown Surfaces
A hybrid control scheme based on adaptive visual servoing and direct force control is proposed for robot manipulators to perform interaction tasks on smooth surfaces. The camera parameters, as well as the constraint surface, are considered to be uncertain. A fixed camera with optical axis non-perpendicular to the robot workspace is used for position control, while a force sensor mounted on the ...
متن کاملMimetic visual servoing with adaptive neural network (ANN)
In this paper we present a model free hybrid visual servoing system. The “model free” term refers to the system with the unknown kinematics model that has to be estimated on-line, while “hybrid” specifies the visual controller architecture. The proposed system has a conventional Jacobian estimation part necessary for control output generation and it is supplemented with an additional adaptive n...
متن کاملAdaptive visual-force control in unknown workspaces
This paper proposes the definition of a new adaptive system that combines visual and force information. At each moment, the proportion of information used from each sensor is variable depending on the adequacy of each sensor to control the task. The sensorial information obtained is processed to allow the use of both sensors for controlling the robot and avoiding situations in which the control...
متن کاملAdaptive visual servoing and force control fusion to track surfaces
This paper describes an adaptive and autocalibrated method to track surfaces. To do so, a non time dependent impedance control system is proposed. This method fuses visual and force information to track a given trajectory maintaining the contact with the surface. The main contribution of the visual servoing approach employed by the impedance control system is the possibility of carrying out the...
متن کاملAdaptive visual servoing for legged robots-vision-cued swaying of legged robots in unknown environments
This paper describes a method to achieve a visioncued swaying task in unknown environments utilizing adaptive visual servoing. The proposed method has a hybrid structure consisting of a controller to keep the distances between feet constant (a stance servoing controller), and an adaptive visual servoing controller. Making use of the method, the motion of each joint need not be pre-programmed, b...
متن کامل