Visual servoing with hand-eye manipulator-optimal control approach

This paper proposes a control theoretic formulation and a controller design method for the feature-based visual servoing with redundant features. The linear time-invariant (LTI) formulation copes with the redundant features and provides a simple framework for controller design. The proposed linear quadratic (LQ) method can deal with the redundant features, which is important because the previous LQ methods are not applicable to redundant systems. Moreover, this LQ method gives flexibility for performance improvement instead of the very limited design parameters provided by the generalized inverse and task function controllers. Validity of the LTI model and effectiveness and flexibility of the LQ optimal controller are evaluated by real-time experiments on a PUMA 560 manipulator</p

Visual tracking of redundant features

This paper presents how the control performance of the feature-based visual servo system is improved by utilizing redundant features. Effectiveness of the redundant features is evaluated by the smallest singular value of the image Jacobian which is closely related to the accuracy in the world coordinate system. An LQ control scheme is used to resolve the controllability problem. Usefulness of the redundant features is verified by the real time experiments on a PUMA 560 manipulator

Control Servo-Visual de un Robot Manipulador Planar Basado en Pasividad

En este trabajo se diseña un controlador servo visual basado en la propiedad de pasividad del sistema visual. Se propone un regulador con ganancias de control variables, de tal manera que se evita la saturacion de los actuadores y al mismo tiempo presenta la capacidad de corregir errores de pequena magnitud. Asimismo el diseno se hace teniendo en cuenta el desempeno L2, a fin de darle capacidad de seguimiento de objetos en movimiento, con un error de control pequeno. Se muestran resultados experimentales realizados en un robot manipulador industrial tipo planar para verificar el cumplimiento de los objetivos del controlador propuesto

Uncalibrated Dynamic Mechanical System Controller

An apparatus and method for enabling an uncalibrated, model independent controller for a mechanical system using a dynamic quasi-Newton algorithm which incorporates velocity components of any moving system parameter(s) is provided. In the preferred embodiment, tracking of a moving target by a robot having multiple degrees of freedom is achieved using an uncalibrated model independent visual servo control. Model independent visual servo control is defined as using visual feedback to control a robot's servomotors without a precisely calibrated kinematic robot model or camera model. A processor updates a Jacobian and a controller provides control signals such that the robot's end effector is directed to a desired location relative to a target on a workpiece.Georgia Tech Research Corporatio

Sliding mode control for robust and smooth reference tracking in robot visual servoing

[EN] An approach based on sliding mode is proposed in this work for reference tracking in robot visual servoing. In particular, 2 sliding mode controls are obtained depending on whether joint accelerations or joint jerks are considered as the discontinuous control action. Both sliding mode controls are extensively compared in a 3D-simulated environment with their equivalent well-known continuous controls, which can be found in the literature, to highlight their similarities and differences. The main advantages of the proposed method are smoothness, robustness, and low computational cost. 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Unidade de processamento e sistema de visão para um robô humanóide

Mestrado em Engenharia Electrónica e TelecomunicaçõesEste trabalho descreve a integração da Unidade Central de Processamento, um computador embebido, numa plataforma humanóide e o desenvolvimento do sistema de visão do robô. É abordado o processo de alteração da estrutura da plataforma para a integração física, e também a configuração e implementação do ambiente de desenvolvimento por forma a permitir a integra ção numa arquitectura de controlo distribuída já existente. O sistema de visão é baseado numa unidade pan-tilt que movimenta uma câmara para aquisição de imagem. A informação retirada da imagem adquirida é processada e usada para fazer o seguimento de um objecto. Para o seguimento são usados dois algoritmos de controlo baseados na imagem. ABSTRACT: This report describes the integration of the Central Control Unit, an embedded computer, on an humanoid platform and the development of the robot's vision system. The necessary changes on the physical support are shown as well as the configuration and implementation of the development environment, in order to allow the integration with the existing distributed architecture. The vision system is based on a pan and tilt unit supporting a color CCD camera for image aquisition. The visual tracking is based on the features of the acquired and processed image. Two diferent image-based algorithms are used for control