Unmanned Aerial systems (UAS) are growing in applications every day, extending into the fields of agriculture and data acquisition. Increasingly, these systems are being designed to be low cost and affordable; althoug...
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Unmanned Aerial systems (UAS) are growing in applications every day, extending into the fields of agriculture and data acquisition. Increasingly, these systems are being designed to be low cost and affordable; although, are often required to carry expensive payloads that adds higher mission risk if the UAS faults mid-flight. Real time health prognostics of UAS capable of alerting a pilot or ground system of potential problems before they arise will decrease the associated risk of high cost payloads on lower cost UAS. In this paper, a novel strategy of embedding health monitoring systems within a 3D printed structure or airframe is presented.
This paper introduces a low cost temperature control experimental platform for hardware-in-the-loop simulations. It is developed based on the thermal electronic elements to emulate a temperature control loop in a chem...
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ISBN:
(纸本)9781479925926
This paper introduces a low cost temperature control experimental platform for hardware-in-the-loop simulations. It is developed based on the thermal electronic elements to emulate a temperature control loop in a chemical process. The novel aspect lies in the discovery and discussion of some interesting characteristics of this hardware setup through experiments, which includes the fractional order inverse response behavior, the “open loop linear while closed loop nonlinear” behavior and so forth. These phenomena provide more physical evidences for revealing the value of fractional calculus.
Remote sensing data using thermal-infrared (TIR) cameras can be very helpful for many applications including agriculture and thermal refugia for fish habitat. Small unmanned aerial vehicles (UAS) can be efficient plat...
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Remote sensing data using thermal-infrared (TIR) cameras can be very helpful for many applications including agriculture and thermal refugia for fish habitat. Small unmanned aerial vehicles (UAS) can be efficient platforms for providing high-resolution thermal imagery at a low-cost;however most thermal cameras used for remote sensing are cooled systems and can be very large, expensive, and consume large amounts of power. Because of these constraints they are not easily integrated with small UAS. For surveillance and military applications, microbolometer thermal cameras are widely used on UAS because they are smaller, less expensive and consume less power than cooled thermal cameras. However, microbolometer thermal cameras are not as sensitive and accurate as cooled systems. Also, many are not calibrated and only measure relative temperature. This presents a challenge when microbolometer thermal cameras are used for scientific and ecological applications: absolute surface temperature is necessary for these applications. This paper presents procedures that can be followed to convert the raw images from a microbolometer camera to accurately represent surface temperature (without compensating for emissivity). The steps needed for this include preparing the images for orthoretification, geometric calibration, orthorectification, and correction for external disturbances.
作者：
Zhuo LiYangQuan ChenMechatronics
Embedded Systems and Automation (MESA) Lab School of Engineering University of California Merced 5200 North Lake Road Merced CA 95343 USA
The relay feedback approach has been used to identify integer order models. Fractional order systems are usually identified by many other approaches. Yet, using the relay feedback to identify a fractional order system...
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ISBN:
(纸本)9781479932757
The relay feedback approach has been used to identify integer order models. Fractional order systems are usually identified by many other approaches. Yet, using the relay feedback to identify a fractional order system has not been reported. This paper investigates this interesting and useful topic by means of extending the relay feedback identification method from integer order systems to a class of linear fractional order systems. Equations are derived for model parameter calculation. Simulation and experiments are presented to verify the feasibility and effectiveness of the proposed approach.
This paper presents fractional-order modeling of a permanent magnet synchronous motor (PMSM) velocity servo system in frequency domain. The traditional integer order model of the PMSM velocity system is extended to fr...
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ISBN:
(纸本)9781479925926
This paper presents fractional-order modeling of a permanent magnet synchronous motor (PMSM) velocity servo system in frequency domain. The traditional integer order model of the PMSM velocity system is extended to fractional order one for an improved modeling precision. An enhancement of the classic Levy identification method with weights is applied to identify the parameters of the proposed fractional order model. In a real-time PMSM velocity servo plant, the fractional order model is identified according to the experimental tests using the presented algorithm.
As Unmanned Aerial System (UAS) technology matures, the list of potential civilian applications continues to grow substantially. Currently, the majority of applications are centered around providing optical imagery, e...
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ISBN:
(纸本)9781479923779
As Unmanned Aerial System (UAS) technology matures, the list of potential civilian applications continues to grow substantially. Currently, the majority of applications are centered around providing optical imagery, either in real-time video or high resolution mapping. But as more sophisticated applications are desired, the limitations of simple imagery are becoming more evident, especially for precision agricultural applications. However, recent advancements in UAS based precision agriculture have demonstrated the effectiveness of including thermal infrared (TIR) cameras. In many situations, decision support indicators are evident in the TIR spectrum, whereas they are undetectable in the visible light and near-infrared spectrum. In this paper, a survey of some of the applications under development utilizing TIR imagery is presented along with implementation strategies to provide guidance for researchers wishing to add TIR imagery into their applications.
This paper considers the robust stability for uncertain fractional-order (FO) descriptor nonlinear systems. A key analysis technique is enabled by proposed a fundamental boundedness lemma, for the first time. It is us...
This paper considers the robust stability for uncertain fractional-order (FO) descriptor nonlinear systems. A key analysis technique is enabled by proposed a fundamental boundedness lemma, for the first time. It is used for rigorous robust stability analysis of FO systems, especially for Mittag-Leffler stability analysis of FO nonlinear systems. More importantly, how to obtain a more accurate bound is analyzed to reduce conservative. An FO proportional-derivative controller is utilized to normalize the descriptor system. Furthermore, a criterion for stability of the normalized FO nonlinear system is provided by utilizing linear matrix inequality (LMI). Finally, two illustrative examples show the effectiveness of the proposed stability notion.
This paper develops a fractional-order (FO) power rate type reaching law for sliding mode control (SMC) of nonlinear integer order systems with disturbance and uncertainty. The proposed FO power rate type reaching law...
This paper develops a fractional-order (FO) power rate type reaching law for sliding mode control (SMC) of nonlinear integer order systems with disturbance and uncertainty. The proposed FO power rate type reaching law, including an FO derivative function, is proven to ensure that the state trajectories achieve to the switching surface in a finite time. Most importantly, the calculation formula of the reaching time under the FO reaching law is provided, for the first time. The comparisons between the FO and IO reaching laws reveal the potential advantages of the FO reaching law. Furthermore, the criterion for stability of the sliding mode dynamics is provided by solving linear matrix inequality (LMI). Finally, simulation and experimental examples illustrate the effectiveness and advantage of the proposed control method.
The main purpose of this work is to develop a closed-loop fractional order control system for a three phase grid-connected photo-voltaic (PV) system. A two level three phase inverter with an inductive filter is chosen...
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ISBN:
(纸本)9781479932757
The main purpose of this work is to develop a closed-loop fractional order control system for a three phase grid-connected photo-voltaic (PV) system. A two level three phase inverter with an inductive filter is chosen as a benchmark, due to the fact that this topology is more popular and simple in a grid connected PV system. A fractional order PI controller has been tuned for current control loop of the considered system and the system responses are compared with the responses of the closed loop system with integer order controller. Simulation results show the improvement in the performance of grid-connected PV system by using the fractional order controller.
作者：
Zhuo LiChun YinYangQuan ChenMechatronics
Embedded Systems and Automation (MESA) Lab School of Engineering University of California Merced 5200 North Lake Road Merced CA 95343 USA School of Automation Engineering
University of Electronic Science and Technology of China Chengdu 611731 P. R. China
The extremum seeking control (ESC) is a model free approach for solving the online optimization control problems. In this paper, a general purpose ESC based on the fractional order sliding mode is presented with a sui...
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ISBN:
(纸本)9781467360890
The extremum seeking control (ESC) is a model free approach for solving the online optimization control problems. In this paper, a general purpose ESC based on the fractional order sliding mode is presented with a suitable application on the plasma impedance matching. The principle and stability of the proposed control law are illustrated mathematically. Simulation is provided to show the effectiveness, necessity and worthiness of using this advanced control strategy. Remarks are given with regard to the implementation and potential research opportunities.
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