Unmanned Aerial systems (UASs) have been utilized in a wide variety of researchcentric applications, especially within the last several years. However, the majority of these applications have utilized specialized equi...
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Unmanned Aerial systems (UASs) are expected to see the largest application within the agricultural market. These versatile platforms have shown promise ushering in the next wave of precision agriculture. While remote ...
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This paper considers estimating the state-of-charge (SOC) for lithium-ion batteries, that utilizes a fractional-order (FO) sliding-mode observer (SMO) is investigated. The capacity loss and deterioration resistance ca...
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ISBN:
(纸本)9781479925926
This paper considers estimating the state-of-charge (SOC) for lithium-ion batteries, that utilizes a fractional-order (FO) sliding-mode observer (SMO) is investigated. The capacity loss and deterioration resistance can be estimated by the FO SMO. Based on Mittag-Leffler stability theory, the FO SMO is designed and analyzed. The convergence property about FO SMO is shown by utilizing the Lyanunov-Krasovskii function. A key analysis technique is enabled by proposed a fundamental boundedness lemma. The proposed method is easily applied to SOC in order to illustrate robust control properties against system's errors. The simulation examples are used to illustrate effectiveness of the proposed control scheme.
Unmanned Aerial systems (UASs) are expected to see the largest application within the agricultural market. These versatile platforms have shown promise ushering in the next wave of precision agriculture. While remote ...
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Unmanned Aerial systems (UASs) are expected to see the largest application within the agricultural market. These versatile platforms have shown promise ushering in the next wave of precision agriculture. While remote sensing applications have been well documented and developed, there remains significant advances left to be made in improving the use of UASs for precision application of pesticides. Although the current mode of aerial spraying or application of pesticides within the U.S. is done using full-sized aircraft, future implementations for autonomous crop dusting are likely to utilize small unmanned aircraft systems (SUASs) due to their much lower cost and ease of use. However, these smaller platforms have limited payload capacities, thus the development of cooperative swarms of SUASs is necessary. In this paper, a swarm of cooperative SUASs are utilized within a cyber-physical system framework to optimize the use of pesticides with precision spraying. Through the use of Centroid Voronoi Tessellation, the swarm makes the most efficient use of pesticides to attack an invasive pathogen. Simulation results are presented to validate the performance of the proposed method.
Unmanned Aerial systems (UASs) have been utilized in a wide variety of research-centric applications, especially within the last several years. However, the majority of these applications have utilized specialized equ...
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Unmanned Aerial systems (UASs) have been utilized in a wide variety of research-centric applications, especially within the last several years. However, the majority of these applications have utilized specialized equipment developed by experts in UAS technology. As the impact of using UASs for research applications become more widely known, the demand for their use will grow. Currently, the field of commercially available systems is growing larger every day, but many end-user researchers do not know how to utilize these systems for their needs. In this paper, an evaluation of many commercially available systems and typical payload systems is presented to help end-user researchers understand how to select the system that best suits their needs.
Motivated by the experimental result of an electronic circuit element"fractor",we introduce the concept of a dynamic-order fractional dynamic system,in which the differential-order of a fractional dynamic sy...
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Motivated by the experimental result of an electronic circuit element"fractor",we introduce the concept of a dynamic-order fractional dynamic system,in which the differential-order of a fractional dynamic system is determined by the output signal of another dynamic *** concept offers an explanation for the physical mechanism of variable-order fractional dynamic systems and multi-system *** properties and potential applications of dynamic-order fractional dynamic systems are further explored by analyzing anomalous relaxation and diffusion processes.
Small unmanned aerial systems (UAS) can be very useful for acquiring high resolution thermal imagery for many ecological applications. With these systems, routine ground sampling is important in order to calibrate the...
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ISBN:
(纸本)9781479911127
Small unmanned aerial systems (UAS) can be very useful for acquiring high resolution thermal imagery for many ecological applications. With these systems, routine ground sampling is important in order to calibrate the imagery and to understand unique environmental disturbances. Simple, accurate methods to sample surface temperature is needed. This paper introduces two methods for sampling ground surface temperatures. One method uses a ground-based thermal camera to capture a high-resolution sample of a small area. The other method uses temperature controlled pools, which can be seen from the aerial thermal image. These samples are used to calibrate a thermal mosaic captured by the UAS AggieAir. Accuracy and simplicity are evaluated for each method.
Tracking fish using implanted radio transmitters is an important part of studying and preserving native fish species. However, conventional methods for locating the fish after they are tagged can be time consuming and...
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ISBN:
(纸本)9781479908158
Tracking fish using implanted radio transmitters is an important part of studying and preserving native fish species. However, conventional methods for locating the fish after they are tagged can be time consuming and costly. Unmanned Aerial Vehicles (UAV)s have been used in general radio localization applications and can possibly be used to locate fish quickly and effectively. However, the methods developed for multi-UAV navigation and transmitter localization are complex and might not work well for practical and routine use. This work focuses on developing simple methods for multi-UAV navigation and transmitter localization. Swarm-like navigation methods (using potential fields) are used for multi-UAV navigation, and a simple Kalman Filter is used to estimate the location of the transmitter. Simulations are presented using one, two and three UAVs. The simulation results show the success with locating the transmitter with two or three UAVs. In addition, coordination between the UAVs is successful using the simple rules of their virtual magnetic fields. A clustering behavior is observed and contributes to the success of the localization.
Orientation estimation is very important for development of unmanned aerial systems (UASs), and is performed by combining data from several sources and sensors. Kalman filters are widely used for this task, however th...
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ISBN:
(纸本)9781479908158
Orientation estimation is very important for development of unmanned aerial systems (UASs), and is performed by combining data from several sources and sensors. Kalman filters are widely used for this task, however they typically assume linearity and Gaussian noise statistics. While these assumptions work well for high-quality, high-cost sensors, it does not work as well for low-cost, low-quality sensors. For low-cost sensors, complementary filters can be used since no assumptions are made with regards to linearity and noise statistics. In this paper, the concepts of filtering based on fractional-order calculus are applied to the complementary filter, and the efficacy of non-integer-order filtering on systems with non-gaussian noise is explored with good success.
In this paper, the problem of designing a sliding mode controller for a class of uncertain fractional-order non-linear systems with 0 < β < 1 is addressed by using linear matrix inequality (LMI) method. A key a...
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ISBN:
(纸本)9781479901777
In this paper, the problem of designing a sliding mode controller for a class of uncertain fractional-order non-linear systems with 0 < β < 1 is addressed by using linear matrix inequality (LMI) method. A key analysis technique is enabled by proposed a fundamental boundedness lemma, which is used for rigorous stability analysis of fractional-order systems, especially for Mittag-Leffler stability analysis of fractional-order nonlinear systems. A new switching law is given to guarantee the reachability condition. This sliding mode control law is utilized to obtain a controller capable of drawing the state trajectories onto the sliding surface and maintain the sliding motion. Numerical simulation results are presented to show the effectiveness of the proposed sliding mode control scheme.
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