Humanoid robots are typically designed to function in static environments using markers and fixtures. To broaden their application, it is vital to understand environmental uncertainties, including kinematics and dynam...
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As the operational demands of power systems grow, the application of teleoperated robots in the power sector has advanced. Traditional live-line robots have improved inspection efficiency and accuracy, while new teleo...
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This paper proposes an adaptive feedback control for an offshore boom crane. The offshore crane is a typical nonlinear under-actuated mechanical system, which has three independent control input (i.e., the boom luffin...
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ISBN:
(纸本)9789819607976;9789819607983
This paper proposes an adaptive feedback control for an offshore boom crane. The offshore crane is a typical nonlinear under-actuated mechanical system, which has three independent control input (i.e., the boom luffing and rotating control torques and the cable length control force) and more than four degrees of freedom (DOFs). These characteristics make the control of an offshore boom crane a difficult issue. The offshore crane is suffering from the persistent ship movement induced disturbances which make the control problem more challenging. Furthermore, in practice, the offshore crane would hoist payloads with different mass and the payload mass is usually unknown. Such that, it is more suitable to design robust anti-swing control methods which do not need the payload mass information. In this paper, the adaptive method is used to approximate the payload mass online and then an energy-based feedback anti-swing control method is proposed to regulate the payload to desired positions and suppress the residual swing. The closed-loop stability is analyzed by using the Lyapunov theory. The effectiveness of the proposed control method is verified via the simulation results.
This study designs a variable configuration for a bionic aerial-aquatic cross-media vehicle, providing a crucial platform support for the research of cross-media key technologies. Utilizing computational fluid dynamic...
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ISBN:
(纸本)9798350370010;9798350370003
This study designs a variable configuration for a bionic aerial-aquatic cross-media vehicle, providing a crucial platform support for the research of cross-media key technologies. Utilizing computational fluid dynamics (CFD) simulation technology, the aero-dynamic characteristics of the prototype at different speeds were analyzed, and the final prototype was successfully developed and tested in flight experiments. The experimental results demonstrate that the aerial-aquatic vehicle can complete the transition between the aerial and aquatic navigation modes through the deformation ability. The maximum flight speed in the air reaches 104 km/h, and when the cruise speed is greater than 54 km/h, the lift-to-drag ratio is greater than 18.623, indicating a good aerodynamic characteristic.
Sound intensity measurement is a critical task in numerous industries, particularly in assessing the noise levels generated by vibrating machinery. Existing methods for such measurements often prove cumbersome, time-c...
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ISBN:
(纸本)9798350367607;9798350367591
Sound intensity measurement is a critical task in numerous industries, particularly in assessing the noise levels generated by vibrating machinery. Existing methods for such measurements often prove cumbersome, time-consuming, and reliant on multiple measurement tools, requiring continuous operator intervention throughout the process. To address this challenge, several studies have explored the integration of collaborative robots to automate these measurements. However, the diversity of programming languages among different robots complicates the implementation process and prolongs setup time. To resolve this issue, our work introduces a unified Python program, leveraging the RoboDK software, to seamlessly adapt our Python code for various robot types. Additionally, we employ offline simulation to ensure smooth operation and validate the effectiveness of our approach through experimental validation. This holistic approach not only streamlines the measurement process but also enhances accuracy and minimizes the need for continuous human intervention.
This paper presents a novel learning-based method for a robotic manipulator to achieve liquid pouring across different liquid levels using only visual sensors. Previous works have relied on either online reinforcement...
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Traditional teleoperation technologies based on video streaming are facing several challenges in practical applications, including limited bandwidth, constrained spatial awareness, and sensitivity to illumination. Exi...
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ISBN:
(纸本)9798350377712;9798350377705
Traditional teleoperation technologies based on video streaming are facing several challenges in practical applications, including limited bandwidth, constrained spatial awareness, and sensitivity to illumination. Existing studies have not adequately addressed these issues. This paper presents a novel non-video based teleoperation framework for autonomous vehicles operating in bandwidth-limited environments. To reduce the amount of data being transmitted, a persistent-transient environment model is proposed for telepresence. Initially, a digital twin of the environment is preconstructed, containing only persistent environmental information. Subsequently, transient information captured by onboard sensors, such as vehicle state and dynamic objects, necessitate real-time transmission. Based on this model, a 3D virtual scene is rendered in front of the teleoperator, offering any desired virtual viewpoint to enhance spatial awareness. This telepresence model only requires real-time transmission of minimal data, i.e., vehicle state and detected objects, and remains unaffected by illumination conditions, enabling teleoperation even in applications with Kbps-level bandwidth constraints. Experimental results showcase the substantial potential of the proposed framework in bandwidth-limited settings.
Electromyographic signals offer details on a muscle activity of a person. In the case of hand movements various combinations of forearm muscles must be activated in order to carry out each gesture, which results in un...
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In recent years, with the rapid development of artificial intelligence and computer vision technology, vision based intelligent detection and positioning systems have been widely applied in various fields. This paper ...
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To overcome the limitations of conventional echo state networks (ESN), such as redundant connections and insufficient frequency-domain feature extraction, this paper proposes a frequency-domain feature architecture se...
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