The rising interest in energy efficiency for hydraulic systems directs the research towards electro-hydraulic drives, namely linear actuators (i.e., hydraulic cylinders) directly coupled to pumps driven by electric mo...
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ISBN:
(纸本)9798350389814;9798350389807
The rising interest in energy efficiency for hydraulic systems directs the research towards electro-hydraulic drives, namely linear actuators (i.e., hydraulic cylinders) directly coupled to pumps driven by electric motors. This approach removes functional power dissipations, enables energy recovery, and facilitates system commissioning. However, these drives are characterized by inherently low damping that causes unwanted payload oscillations and deteriorates the position control's accuracy of the actuator. Adding active damping via proper control techniques is essential. Hence, this paper develops a model-based design for closed-loop position control with the addition of high-pass-filtered pressure feedback. The model supports identifying crucial control parameters, such as the proportional and integral gains of the position feedback and the gain and time constant of the pressure feedback. This method is experimentally tested on a heavy-duty robotic manipulator. The results show that the payload oscillations are reduced dramatically, and the position tracking is accurate and robust for different load cases.
The emergence of smart tourism, propelled by the advancement of new-generation information technologies such as 5G, cloud computing, big data, and artificial intelligence (AI), has instigated transformative shifts in ...
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In Peru, 2.76% of the population, equivalent to some 932,000 people, have motor disabilities and use wheelchairs. These people face accessibility problems due to the lack of inclusion in architecture, especially when ...
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ISBN:
(纸本)9798350352481;9798350352474
In Peru, 2.76% of the population, equivalent to some 932,000 people, have motor disabilities and use wheelchairs. These people face accessibility problems due to the lack of inclusion in architecture, especially when using stairs. The research proposes to design a portable extension for wheelchairs, which allows users to go up and down stairs autonomously and safely, by means of a PID speed control. Although there are solutions such as ramps, lightweight chairs and motorized devices, most of them do not provide full autonomy to the user
To address the challenges of autonomous navigation and intelligent obstacle avoidance for clusters of homogeneous unmanned surface vehicles (USVs) in intricate environments, a self-driving algorithm utilizing multi-ag...
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ISBN:
(纸本)9798350389814;9798350389807
To address the challenges of autonomous navigation and intelligent obstacle avoidance for clusters of homogeneous unmanned surface vehicles (USVs) in intricate environments, a self-driving algorithm utilizing multi-agent reinforcement learning (MARL) is introduced. A multi-obstacle scenario is created, where the interactions among unmanned underwater vehicles are used to assess the game situation. The USV fleet undergoes training through the multi-agent proximal policy optimization algorithm (MAPPO) to facilitate autonomous driving. This approach allows for efficient route planning and effective obstacle evasion, ensuring that the vehicles reach their destination with the desired orientation and relative positioning. The simulation environment is constructed with the Unity game engine, providing visualization during training to enhance algorithm robustness. Experimental results demonstrate that both the proposed algorithm and simulation setup exhibit strong feasibility and good performance.
This paper presents a Bayesian optimization framework for the automatic tuning of shared controllers which are defined as a Model Predictive control (MPC) problem. The proposed framework includes the design of perform...
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ISBN:
(纸本)9798350384581;9798350384574
This paper presents a Bayesian optimization framework for the automatic tuning of shared controllers which are defined as a Model Predictive control (MPC) problem. The proposed framework includes the design of performance metrics as well as the representation of user inputs for simulation-based optimization. The framework is applied to the optimization of a shared controller for an Image Guided Therapy robot. VR-based user experiments confirm the increase in performance of the automatically tuned MPC shared controller with respect to a hand-tuned baseline version as well as its generalization ability.
In recent years, the field of machine vision has developed rapidly, enabling the extraction of increasingly detailed information from images. At the same time, robotics technology has also advanced swiftly, with robot...
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ISBN:
(纸本)9798350389814;9798350389807
In recent years, the field of machine vision has developed rapidly, enabling the extraction of increasingly detailed information from images. At the same time, robotics technology has also advanced swiftly, with robots being widely applied in daily life. In our research, we combined machine vision technology with robotics to study operations for power distribution cabinets. Our system is based on a six-degree-of-freedom robotic arm, with the robot's end effector using a two-finger parallel electric gripper and an RGB-D camera for visual data acquisition. We also proposed a vision processing method to identify the status of the power distribution cabinet and to recognize and calculate the rotation angle of knobs. The system, utilizing these methods, was integrated into a power distribution cabinet platform for experimental testing. The robot was then controlled to perform the corresponding tasks, achieving success rates of 100%, 80%, and 70% respectively. Therefore, our proposed vision processing method effectively identifies and calculates the position and angle of buttons and knobs, and the integrated system successfully completed the corresponding tasks.
A quadcopter is an unmanned aerial vehicle that requires a control system to stabilize it during flight. In this paper, a data-driven control algorithm, Light Gradient Boost Machine (LightGBM) is proposed to improve t...
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ISBN:
(纸本)9798350372113;9798350372106
A quadcopter is an unmanned aerial vehicle that requires a control system to stabilize it during flight. In this paper, a data-driven control algorithm, Light Gradient Boost Machine (LightGBM) is proposed to improve the quadcopter control system. The input and output data we use for the LightGBM algorithm are obtained from a closed-loop quadcopter system with a linear quadratic regulator (LQR) controller. With the expectation that the LightGBM control algorithm can replace the LQR controller on the quadcopter. Simulations have been carried out in this study, and the results of the simulations show that the proposed algorithm has similar response results as LQR control, so that the proposed algorithm can be used as a control system in the quadcopter system.
The aging population and diminishing working population in agriculture motivate the development of autonomous harvesting robots. Although autonomous harvesting is expanding rapidly, the commercial application of sweet...
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ISBN:
(纸本)9798350384581;9798350384574
The aging population and diminishing working population in agriculture motivate the development of autonomous harvesting robots. Although autonomous harvesting is expanding rapidly, the commercial application of sweet pepper harvesting robots still faces challenges. This paper presents the development of a sweet pepper harvesting robot and reports its experimental verification, which mainly includes end-effector design, visual perception, and grasping pose control. The end-effector adopts electrical control, mainly composed of a servo-electric two-finger parallel clamping module, a swing-cutting module, and a fruit recovery device. Equipped with a tactile sensor array, it can accurately sense the sweet pepper peduncle position and the end-effector state (harvesting failure) to complete the precise cutting. An end-effector grasping pose control algorithm of the manipulator is proposed, which can control the end-effector to grasp along the direction of the fruit peduncle and perpendicular to the tangent direction of the picking point by estimating the pose of the sweet pepper peduncle. Finally, the robot and proposed method were verified in a plant factory. The experimental findings demonstrate that the developed harvesting robot can complete robust detection of fruit peduncles and non-destructive picking of sweet pepper, with an average picking time of about 15 seconds.
The increasing adoption of electric vehicles (EVs) has intensified the demand for efficient navigation methods to locate charging stations, optimizing both user convenience and energy utilization. This paper proposes ...
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ISBN:
(纸本)9798350389814;9798350389807
The increasing adoption of electric vehicles (EVs) has intensified the demand for efficient navigation methods to locate charging stations, optimizing both user convenience and energy utilization. This paper proposes a Q-learning-based path planning approach that dynamically identifies optimal routes for EVs while considering real-world constraints such as traffic and charging station availability. The proposed model integrates grid-based environmental modeling with reinforcement learning to achieve robust and adaptive path optimization. Experimental results, conducted on simulated urban environments derived from real-world data, demonstrate the algorithm's ability to effectively navigate diverse scenarios, minimizing travel distance and avoiding obstacles. The findings highlight the potential of this approach to enhance EV navigation systems and lay a foundation for future research in high-complexity transportation networks.
Quadcopter drones rely entirely on their four rotors to control altitude and attitude. A complete failure of any single rotor results in losing stability and control unless the controller can reconfigure the drone'...
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ISBN:
(数字)9798350372106
ISBN:
(纸本)9798350372113;9798350372106
Quadcopter drones rely entirely on their four rotors to control altitude and attitude. A complete failure of any single rotor results in losing stability and control unless the controller can reconfigure the drone's remaining actuators to re-establish balance in forces and moments. Previous attempts to reinstate full stability and control for this type of unbalanced drone by using classical and modern control laws have been unsuccessful. Recent development in Artificial Intelligence technology, however, may suggest a new control solution to rescue the crippled drone. The work reported in this paper proposes the initial strategies to implement Reinforcement Learning technique to find an optimal solution by regulating the remaining rotor speeds. The mode chosen for the study is hovering. The strategy to train the Reinforcement Learning agent is also included.
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