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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16301
標題: | 海洋聲層析之自主式水面載具編隊控制研究 Formation Control of Autonomous Surface Vehicles for Acoustic Tomography |
作者: | Mu-Hua Chen 陳霂華 |
指導教授: | 郭振華(Jen-hwa Guo) |
關鍵字: | 欠驅動海洋無人載具,動力模型,反步控制器設計,移動載具聲層析, under-actuated marine vehicle,dynamic modeling,backstepping control,moving vehicle tomography, |
出版年 : | 2021 |
學位: | 碩士 |
摘要: | 本文提出一種應用於移動載具聲層析之水面載具群隊的編隊控制設計方法。由於移動載具聲層析所使用之編隊隊形需由成對的載具使用聲層析收發器發送聲訊號掃描待測海域,本文以多載具平均分佈於圓隊形上互繞之編隊為目標,則其半徑之選定須滿足聲層析傳發器之訊號發送持續時間,載具速度設定則需考慮都普勒效應訊號處理濾波器設計的頻寬限制。本文提出之導航器首先輸入載具之初始位置,隊形上之導航點即自動收斂成繞圓形隊伍,並經由座標轉移矩陣產生導航點的軌跡。而載具之運動控制則根據反步控制器設計方法產生一個穩定的水面無人載具的欠驅動控制器以追蹤隨時移動之導航軌跡。 為驗證此算法,本文設計並製作一水面無人載具,並於基隆望海巷灣進行海域實驗。模擬與實驗結果顯示本方法可以產生滿足移動載具層析聲納系統所需的隊形,且水面無人載具在海流干擾下,可以穩定地航行。本文最後探討海流干擾、載具模式誤差及載具定位誤差對軌跡追蹤誤差之影響,其模擬與海域實驗結果呈現一致性,而海流干擾為主要之誤差源。 This study proposes a formation controller for moving vehicle tomography (MVT). In general, pairs of transmitter-receivers are used to circle the water body to collect acoustic ray data for the tomography inversion of the current field. Circular trajectories are selected for multi-vehicle formation control to evenly distribute guidance points of vehicles. The radius of the trajectory circle must satisfy time constraints derived from MVT transmission durations, and the speed of vehicles is limited by the filter bandwidth for processing the Doppler effects. The guidance law required initial positions of vehicles so that guidance trajectories converge to be a circular formation and generate a set of desired guiding positions through a transformation matrix. The vehicle motion controller is then designed for tracking using a back-stepping method for an under-actuated surface vehicle model. To test this algorithm, an unmanned testbed vehicle was manufactured. Also, experiments at sea were carried out at WanHaiXiang Bay, Keelung. Both simulations and experimental results show that the formation control can generate the desired circular trajectories, and the unmanned vehicle can navigate along with the desired guidance points under the influences of unknown sea currents. Finally, the tracking errors resulting from the influence of unknown sea currents, vehicle model uncertainties, and GPS positioning errors are discussed. Simulations and experimental results show that the order of magnitudes of the tracking errors caused by various uncertainties is mainly due to the sea currents. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16301 |
DOI: | 10.6342/NTU202100499 |
全文授權: | 未授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
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檔案 | 大小 | 格式 | |
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U0001-0402202111304300.pdf 目前未授權公開取用 | 5.17 MB | Adobe PDF |
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