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CLC number: TP242

On-line Access: 2017-07-31

Received: 2016-11-23

Revision Accepted: 2017-03-08

Crosschecked: 2017-07-13

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Article info.

Frontiers of Information Technology & Electronic Engineering  2017 Vol.18 No.7 P.898-914

http://doi.org/10.1631/FITEE.1601735


Steering control for underwater gliders


Author(s):  You Liu, Qing Shen, Dong-li Ma, Xiang-jiang Yuan

Affiliation(s):  School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China; more

Corresponding email(s):   542165262@qq.comyuan_xj18@163.com

Key Words:  Autonomous underwater glider (AUG), Online system identification, Steering control, Adaptive control, Optimal control, Energy saving control, Processor-in-loop (PIL)


You Liu, Qing Shen, Dong-li Ma, Xiang-jiang Yuan. Steering control for underwater gliders[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(7): 898-914.

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author="You Liu, Qing Shen, Dong-li Ma, Xiang-jiang Yuan",
journal="Frontiers of Information Technology & Electronic Engineering",
volume="18",
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pages="898-914",
year="2017",
publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.1601735"
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T1 - Steering control for underwater gliders
A1 - You Liu
A1 - Qing Shen
A1 - Dong-li Ma
A1 - Xiang-jiang Yuan
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/FITEE.1601735


Abstract: 
steering control for an autonomous underwater glider (AUG) is very challenging due to its changing dynamic characteristics such as payload and shape. A good choice to solve this problem is online system identification via in-field trials to capture current dynamic characteristics for control law reconfiguration. Hence, an online polynomial estimator is designed to update the yaw dynamic model of the AUG, and an adaptive model predictive control (MPC) controller is used to calculate the optimal control command based on updated estimated parameters. The MPC controller uses a quadratic program (QP) to compute the optimal control command based on a user-defined cost function. The cost function has two terms, focusing on output reference tracking and move suppression of input, respectively. Move-suppression performance can, at some level, represent energy-saving performance of the MPC controller. Users can balance these two competitive control performances by tuning weights. We have compared the control performance using the second-order polynomial model to that using the fifth-order polynomial model, and found that the former cannot capture the main characteristics of yaw dynamics and may result in vibration during the flight. Both processor-in-loop (PIL) simulations and in-lake tests are presented to validate our steering control performance.

水下(xià)滑翔機航向控制

概要:水下(xià)滑翔機動力學特性随有效載荷及外(wài)形變化而變化,其航向控制富有挑戰性。解決方法是使用在線系統辨識算法捕捉當前動力學特性,更新運動模型。爲此,我(wǒ)們設計了一(yī)個在線多項式辨識器,不斷更新當前動力學模型,同時用一(yī)個自适應模型預測控制器計算并輸出最優化的控制指令。該控制器根據用戶自定義的指标函數,使用二次規劃方法得到最優控制指令。該指标函數由兩項組成,一(yī)項用來表達軌迹跟蹤性能,一(yī)項用來表達輸入指令抑制性能。輸入指令抑制性能一(yī)定程度上可以代表該控制器的能量消耗性能。設計師可以通過調節這兩項的權重,平衡兩個控制器的性能。比較二次與五次多項式模型的控制效果,發現:二次多項式模型不足以表達無人機的動力學特性,且控制結果易發生(shēng)劇烈波動。硬件在環模拟以及湖試結果驗證了控制器性能。

關鍵詞:水下(xià)滑翔機;在線系統辨識;航向控制;自适應控制;最優控制;節能控制;硬件在環模拟

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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