Single-sided air-coupled ultrasonic inspection has some beneficial properties compared to water-coupled ultrasonic inspection or double-sided ultrasonic testing. The absence of the need for water leads to easier proce...
详细信息
ISBN:
(纸本)9789897583803
Single-sided air-coupled ultrasonic inspection has some beneficial properties compared to water-coupled ultrasonic inspection or double-sided ultrasonic testing. The absence of the need for water leads to easier process handling on the one hand e.g. when manufacturing aircraft components. On the other hand, because the process is single-sided, reachability is a minor problem compared to double-sided testing and end-effectors and fixtures can be designed in a less complex and more compact way. However, the nature of lamb waves requires that the geometrical relation of the transmitter and the receiver varies during the inspection process. In this paper, a prototype of an adaptive end-effector is introduced that was developed to implement this requirement and results of first evaluation tests are presented.
Some failures cause the robots to loss parts of their capabilities, so that they cannot perform their assigned tasks. Considering requirements of typical robotic teams during different missions, a distributed behavior...
详细信息
ISBN:
(纸本)9789728865832
Some failures cause the robots to loss parts of their capabilities, so that they cannot perform their assigned tasks. Considering requirements of typical robotic teams during different missions, a distributed behavior based control architecture is introduced in this paper. This architecture is based on an enhanced version of ALLIANCE, and provides the robots the ability of performing shared tasks based on help requests. The architecture contains a mechanism for adaptive action selection and a communication protocol for information and task sharing which are required for coordination of team members. The proposed architecture is used in a box pushing mission where heterogeneous robots push several boxes with different masses.
The Plug-And-Play is a synonym for the simple use of computer systems in office applications. This appealing idea also emerges in the branches of robotics and automation. But due to their specific technical and applic...
详细信息
ISBN:
(纸本)9789898111319
The Plug-And-Play is a synonym for the simple use of computer systems in office applications. This appealing idea also emerges in the branches of robotics and automation. But due to their specific technical and application driven requirements i.e. real-time, determinism, safety... a simple taking over of the technology is not sufficient. Plug-and-Produce extends the "easy to use" for applications in robotics and automation. This will lead to a dramatically reduction of set-up times of work-cells. In order to fulfil the various requirements a three layered Plug-and-Produce architecture is presented. The communication layer addresses all topics regarding the bus-system level;the configuration layer is responsible for the control and operation system level;and the application layer addresses the needs of the user and system programmer. A prototypical implementation is also presented.
Further studies on computer-based perception by vision modelling are described. The visual perception is mathematically modelled, where the model receives and interprets visual data from the environment. The perceptio...
详细信息
ISBN:
(纸本)9789728865832
Further studies on computer-based perception by vision modelling are described. The visual perception is mathematically modelled, where the model receives and interprets visual data from the environment. The perception is defined in probabilistic terms so that it is in the same way quantified. At the same time, the measurement of visual perception is made possible in real-time. Quantifying visual perception is essential for information gain calculation. Providing virtual environment with appropriate perception distribution is important for enhanced distance estimation in virtual reality. Computer experiments are carried out by means of a virtual agent in a virtual environment demonstrating the verification of the theoretical considerations being presented, and the far reaching implications of the studies are pointed out.
In this paper we present an approach for multi-robot cooperative exploration based on the potential field generated by several basic behaviours. When an unknown environment is explored the uncertainty in the localizat...
详细信息
ISBN:
(纸本)9789898111319
In this paper we present an approach for multi-robot cooperative exploration based on the potential field generated by several basic behaviours. When an unknown environment is explored the uncertainty in the localization normally grows, this fact may cause the failure of the Simultaneous Localization and Mapping (SLAM) algorithm, and thus constructing an useless and inaccurate map. The exploration algorithm described here considers the current knowledge of the environment, the location of the robots and the uncertainty in their positions in order to return to previously explored areas when it is needed. These actions definitely help the SLAM algorithm to build a precise map. Several simulations are presented that demonstrate the validity of the approach.
in the article we present various theoretical and experimental approaches to the problem of stereo matching and disparity estimation. We propose to calculate stereo disparity in the moments space, but we also present ...
详细信息
ISBN:
(纸本)9728865600
in the article we present various theoretical and experimental approaches to the problem of stereo matching and disparity estimation. We propose to calculate stereo disparity in the moments space, but we also present correlation based method. In order to calculate disparity vector we decided to use discrete orthogonal moments of Tchebichef, Zernike and Legendre. In our research of stereo disparity estimation all of these moments were tested and compared. In the article we also propose the original method of determining the global displacement vector between the stereopair images in order to find the common part of these images (adequate for matching) and the margins of these stereo images. Experimental results confirm effectiveness of the presented methods of determining stereo disparity and stereo matching for robotics and machine vision applications.
This paper presents the control of an aerial manipulation system with a quadrotor and a 2-DOF robotic arm by using the computed torque control method. The kinematic and dynamic model of the system is obtained by model...
详细信息
ISBN:
(纸本)9789897583803
This paper presents the control of an aerial manipulation system with a quadrotor and a 2-DOF robotic arm by using the computed torque control method. The kinematic and dynamic model of the system is obtained by modeling the quadrotor and the robotic arm as a unified system. Then, the equation of motion of the unified system is got in the form of a standard robot dynamics equation. For the trajectory control of the system, computed torque control is used. Gains of the controller are optimized by using nonlinear least squares method. The performance and stability of the control structure are tested with a simulation case study.
Aircraft are non-minimum phase, MIMO and highly nonlinear systems which undergo significant disturbances and variation in system parameters during operation. In spite of the prosperous literature in adaptive control, ...
详细信息
ISBN:
(纸本)9781479951994
Aircraft are non-minimum phase, MIMO and highly nonlinear systems which undergo significant disturbances and variation in system parameters during operation. In spite of the prosperous literature in adaptive control, application of the promising control strategy on aircraft control has been restricted by the lack of assurance in closed-loop stability. This paper proposes a robust adaptive control scheme for aircraft. The scheme is composed of an inner-level adaptive fuzzy PD control law and an outer-level supervisory control law. Importantly, the outer-level controller of the two-level scheme is designed based on a fuzzy model which takes non-minimum phase phenomena and modeling error explicitly into account. Numerical studies of the tracking control of a five degree of freedom aircraft system demonstrate the effectiveness of the proposed control strategy in the face of bursting disturbances.
From the RoboCup goal of having a fully autonomous humanoid soccer team, it is possible to see many applications of the research in the Humanoid Soccer, such as the development of mechanical legs and arms and exoskele...
详细信息
ISBN:
(纸本)9789898111319
From the RoboCup goal of having a fully autonomous humanoid soccer team, it is possible to see many applications of the research in the Humanoid Soccer, such as the development of mechanical legs and arms and exoskeletons. The onboard vision algorithms for multi target tracking and the cooperative decision making of some Soccer Leagues can be used in squadrons of autonomous vehicles in a variety of missions. The algorithms for image processing of the Small Size League can be used in aerial or satellite images to track vehicles. The Simulation League allows the development of many intelligent agents applications. The formations and team play positioning of the Simulation League can be used to optimize the positioning of a squadron of autonomous vehicles. The research of Robotic Soccer fosters and strengthens the research in robotics, allowing and contributing to the development of many powerful applications which can great benefit the mankind.
This research is devoted to solving the problem of adaptive control algorithm synthesis for a mobile robots that is part of a multi-agent system. Proposed approach consists of trajectory planner and inner agent contro...
详细信息
ISBN:
(纸本)9789897583803
This research is devoted to solving the problem of adaptive control algorithm synthesis for a mobile robots that is part of a multi-agent system. Proposed approach consists of trajectory planner and inner agent controller. The case of the passway intersection by the group of mobile robots is considered. Trajectory planner is based on intersection management approach. Adaptive consecutive compensator used for agent controller synthesis. Proposed approach provides control scheme which doesn't depend on plant parameters. A group of mobile robots is built for experimental evaluation of proposed approach. Obtained results confirm effectiveness of the developed algorithms.
暂无评论