Harvesting efficiency is a critical factor in determining whether robotic harvesting can be economically superior to hand picking. One practical challenge in robotic harvesting is to grasp a moving fruit, where unsucc...
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Harvesting efficiency is a critical factor in determining whether robotic harvesting can be economically superior to hand picking. One practical challenge in robotic harvesting is to grasp a moving fruit, where unsuccessful pick cycles may result in lower harvesting efficiency. the fruit motion can be due to exogenous disturbances such as wind gust, canopy unloading, and particularly, fruit detachment forces. In this paper, an adaptive visual servo control law is presented to estimate and subsequently compensate the unknown time varying fruit motion. the fruit motion in the image plane and along the optical axis is modeled as a second-order spring-mass system. the unknown parameters of fruit motion are identified using an adaptive parameter update law, and a robust feedback term is included in the control law to account for modeling uncertainties. Lyapunov-based stability analysis guarantees uniformly ultimately bounded regulation of the robot to the fruit position. Sin mlation results are provided to verify the feasibility of the developed controller. (C) 2016, IFAC (international Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.
In computer vision a reliable recognition and classification of objects is an essential milestone on the way to autonomous scene understanding. In particular, keypoint detection is an essential prerequisite towards it...
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Alarm flooding is one of the main problems in alarm management. Alarm flood pattern analysis is helpful for root cause analysis of historical floods and for incoming flood prediction. this paper introduces a data driv...
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ISBN:
(纸本)9781509035502
Alarm flooding is one of the main problems in alarm management. Alarm flood pattern analysis is helpful for root cause analysis of historical floods and for incoming flood prediction. this paper introduces a data driven method for alarm flood pattern matching. A modified BLAST algorithm with Levenshtein distance is proposed to discover similar alarm floods. A quadruple tank process is simulated to test the effectiveness of the proposed algorithm. the results show that the algorithm is quick and accurate.
this paper develops a model predictive flocking control scheme for the Cucker-Smale multi-agent model. A decentralized controller is designed based only on neighboring measurements. Connectivity conditions are establi...
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ISBN:
(纸本)9781509035502
this paper develops a model predictive flocking control scheme for the Cucker-Smale multi-agent model. A decentralized controller is designed based only on neighboring measurements. Connectivity conditions are established for guaranteeing the convergence to a rigid flock. Finally, numerical simulation demonstrates the effectiveness of the control scheme.
this paper provides a brief overview of recent research activities by Mobile & Marine robotics Research Centre (MMRRC) research team focused toward development of user interfaces for interaction with heterogeneous...
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ISBN:
(纸本)9781509035502
this paper provides a brief overview of recent research activities by Mobile & Marine robotics Research Centre (MMRRC) research team focused toward development of user interfaces for interaction with heterogeneous vehicles in smart Cyber-Physical Systems (CPS). the system, which is currently in development, include both classical user interface elements but also a set of novel "natural" multi-modal user interfaces based on exploration and integration of the state-of-the-art emerging technologies, including Virtal Reality (VR) headsets, spatial tracking devices, 6 DoF input devices, hand gesture recognition devices and touch screens.
this paper is concerned with applicability of intelligent PID controller, which is proposed by Fliss and Join recently. First, we analyze the stability of the closed-loop system when the parameter a, which should be g...
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ISBN:
(纸本)9781509035502
this paper is concerned with applicability of intelligent PID controller, which is proposed by Fliss and Join recently. First, we analyze the stability of the closed-loop system when the parameter a, which should be given by a user, of intelligent PID controller is varying, and propose a method to determine the suitable range of a, by which the stability is guaranteed, by using the roots locus. Second, the simulation study for mitigating the structural vibrations due to earthquakes is presented when the intelligent PID controller is used for the control of a magnetorheological (MR) damper. the performance of the controller is compared withthe H∞ controller-case for the El Centro and Northridge earthquake inputs, and it is confirmed its superiority.
the model predictive control method can be effective for converter control in distributed power generation but requires a large amount of computation, leading to a considerable time delay in the actuation. If the dela...
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ISBN:
(纸本)9781509035502
the model predictive control method can be effective for converter control in distributed power generation but requires a large amount of computation, leading to a considerable time delay in the actuation. If the delay is not reflected, the system performance could get worse. this paper presents a two-step (horizon) prediction algorithm of model predictive control technique for grid-tied inverters used in wind turbine systems. the control objectives such as active and reactive power flow and switching loss reduction are reflected in the objective function of the controller. the proposed model predictive control strategy is verified numerically by using MATLAB/Simulink.
this paper considers H∞ reduced-order filtering problem for discrete-time Takagi-Sugeno (T-S) fuzzy systems with time-varying delay in its state. Firstly, Based on the reciprocally convex methods and a novel fuzzy Ly...
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ISBN:
(纸本)9781509035502
this paper considers H∞ reduced-order filtering problem for discrete-time Takagi-Sugeno (T-S) fuzzy systems with time-varying delay in its state. Firstly, Based on the reciprocally convex methods and a novel fuzzy Lyapunov functional, the proposed basis-dependent condition is utilized to ensure that the resulted error system is asymptotically stable with a prescribed H∞ performance and reduce the conservativeness. then, By utilization of the convex linearization technique, the sufficient condition of reduced-order filter design can be casted into linear matrix inequality constraints. Finally, the desired filters can be obtained based on standard numerical algorithms.
Railway transportation is a predominant transportation medium in the world. the railway transportation is one of the conventional systems that subjects to many accidents annually in most of the countries. Comparativel...
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In this paper, a framework for stability analyses of a typical inverter-based islanded microgrid with a non-linear load is presented, namely ideal constant power load (CPL) which is supplied by tightly regulated power...
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ISBN:
(纸本)9781509035502
In this paper, a framework for stability analyses of a typical inverter-based islanded microgrid with a non-linear load is presented, namely ideal constant power load (CPL) which is supplied by tightly regulated power electronics converter. the whole dynamic model of the considered microgrid is firstly developed, based on which the small signal model of system is deduced at stable operating point. Afterwards, eigenvalue-based stability analysis and parametric sensitivity analysis are accomplished based on the obtained small signal model to predict the system's unstable regions and identify the effects of parameters on the stability boundaries. Simulation studies based on Matlab/Simulink are finally done to verify the theoretical analyses.
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