检索结果-南通市图书馆

Attitude Stabilization of Unmanned Underwater Vehicle During Payloads Release

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2024年第5期29卷 766-772页

作者： DENG Xu feng zhengping HE Chenlu CUI Zhenhua School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai200240China

Large unmanned underwater vehicles can carry big payloads for varied missions and it is desirable for them to possess an upright orientation during payload *** attitude can hardly be maintained during and after the phase of payload *** a payload from the vehicle induces uncertainties not only in rigid-body parameters,e.g,the moment of inertia tensor due to the varying distribution of the masses on board the vehicle,but also in the hydrodynamic derivatives due to the vehicle’s varying geometric profile.A nonlinear attitude stabilizer that is robust to these time-varying model uncertainties is proposed in this *** is guaranteed via Lyapunov stability *** simulation results verify the effectiveness of the proposed approach.

关键词： unmanned underwater vehicle payloads release attitude stabilization Lyapunov stability

Two-Stage Scheme for Disturbance Rejection Hovering Control of Underwater Vehicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2022年第3期27卷 375-382页

作者： BI Anyuan feng zhengping ZHU Yuchen DENG Xu School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China b.State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A two-stage model-independent hovering control scheme for underwater vehicles,which are subject to unknown yet constant external disturbance,to eliminate steady-state depth error is ***derivative(PD)state feedback control law is adopted as the ballast mass planner at the first stage for the vehicle to reach both hydrostatic balance and a steady *** residual depth error is then removed by an additional disturbance rejection control at the second *** asymptotic stability of the whole system is guaranteed via Lyapunov *** effectiveness of the proposed scheme is illustrated by the simulation of diving control of an underwater vehicle with hydraulic variable ballast system.

关键词： underwater vehicles hovering control disturbance rejection variable ballast systems Lyapunov stability

Active Disturbance Rejection Controller Based Heading Control of Underwater Flight Vehicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2020年第4期25卷 441-446页

作者： ZHENG Tianhai feng zhengping ZHAO Shuo PAN Wanjun School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China

The total disturbance estimated by the extended state observer(ESO)in active disturbance rejection controller(ADRC)is affected greatly by measurement noise when the control step is small in heading control of underwater flight vehicles(UFVs).In order to prevent rudder from high-frequency chattering caused by measurement noise,a tracking-differentiator(TD)is integrated to the ESO to develop an improved ADRC *** improved ADRC suppresses the impact of sensor *** the results of simulations and tank tests show the effectiveness of improved ADRC based heading control.

关键词： active disturbance rejection control(ADRC) tracking-differentiator(TD) extended state observer(ESO) total disturbance chattering underwater flight vehicle(UFV)

T-S Fuzzy Model-Based Depth Control of Underwater Vehicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2020年第3期25卷 315-324页

作者： QIAN Yuan feng zhengping BI Anyuan LIU Weiqi School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China

A T-S fuzzy model with two rules is established to exactly describe the nonlinear uncertain heave dynamics of underwater vehicles with bounded heave speed.A single linear-matrix-inequality-based (LMI-based) state feedback controller is then synthesized to guarantee the global stability of the depth control *** results verify the effectiveness of the proposed approach in comparison with linear-quadratic regulator (LQR) *** disturbance observer is appended to the system when the underwater vehicles are affected by the gravity-buoyancy *** two-stage control method is effective to stabilize an uncertain system with both parameter uncertainties and external disturbances.

关键词： underwater vehicles uncertainty depth control T-S fuzzy model

Hierarchical Control of Underwater Vehicle Variable Ballast Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hierarchical Control of Underwater Vehicle Variable Ballast ...

MULTIVARIABLE MODEL REFERENCE ADAPTIVE CONTROL FOR A TURBOFAN ENGINE

第37届中国控制会议

作者： Anyuan Bi zhengping feng School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong University

In this paper, a hierarchical on-off type variable ballast system（VBS） is proposed to improve the performance of hovering control of underwater vehicles. While the upper layer is a PD-type planner which outputs demanded mass of ballast water, the lower layer is an on-off type flowrate controller to track output of the upper layer, i.e., the demanded mass of ballast water. The effectiveness of the proposed scheme is verified by both simulations and tank tests of diving control of an underwater flight vehicle.

关键词： Hovering control Hierarchical architecture Variable ballast system Underwater vehicles

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 1996年第4期9卷 300-304页

作者： Fan Jun Huang Jinquan Sun Jianguo feng zhengping(Dep. Of Power Engineering, Nanjing University of Aeronauticsand Astronautics, Nanjing,China, 210026) Dep. of Power Engineering Nanjing Univ. Aero. and Astronaut. Nanjing 210026 China

A decentralized model reference adaptive control (MRAC) scheme is proposed and applied to design a multivariable control system of a dual-spool turbofan *** studies show good static and dynamic performance of the system over the fullflight envelope. Simulation results also show the good effectiveness of reducing interactionin the multivariable system with significant coupling. The control system developed has awide frequency band to satisfy the strict engineering requirement and is practical for engineering applications.

关键词： turbofan engines model reference adaptive control flight envelopes multivariable control

Depth control of an underwater flight vehicle at low speeds and depths

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Depth control of an underwater flight vehicle at low speeds ...

第37届中国控制会议

作者： Shuo Zhao zhengping feng Tianhai Zheng Wanjun Pan School of Naval Architecture Ocean & Civil EngineeringShanghai Jiao Tong University Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration Shanghai Jiao Tong University

Due to low efficiency of control surfaces and considerable wave-suction force, depth control of an underwater fligh vehicle, moving near surface with a low speed, is extremely hard. To improve depth control performance under such challenging scenarios, a depth-oriented driving scheme where independent bow and stern planes are combined to form virtually a singl actuator to generate pure vertical force for heave motion, is proposed. ADRC（active disturbance rejection controller）–base depth controller is then designed. Both the results of simulations and tank tests of depth control of an underwater flight vehicl verify the effectiveness of the driving scheme proposed.

关键词： underwater flight vehicle depth-oriented driving scheme active disturbance rejection controller tank test

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

航空发动机的低阶ZP/LTR控制

南京航空航天大学学报 2001年第2期33卷 126-129页

作者：冯正平孙健国南京航空航天大学能源与动力学院南京210016

研究了航空发动机的多变量鲁棒控制 ,提出了低阶设计对象模型的构造方法。该模型是通过对被控对象的发动机执行机构进行特定输出反馈而得到的 ,它与被控对象模型阶次相同 ,明显低于目前常用的增广设计方法设计对象模型的阶次。基于低阶... 详细信息

研究了航空发动机的多变量鲁棒控制 ,提出了低阶设计对象模型的构造方法。该模型是通过对被控对象的发动机执行机构进行特定输出反馈而得到的 ,它与被控对象模型阶次相同 ,明显低于目前常用的增广设计方法设计对象模型的阶次。基于低阶设计对象模型 ,作者以前研究的 ZP/ LTR设计方法转化为低阶 ZP/ LTR设计方法 ,应用该方法使设计控制器的阶次明显降低 ,从而更易实现。通过对某型涡扇发动机的仿真研究验证了低阶ZP/ LTR设计方法的有效性。

关键词：航空发动机鲁棒控制 LQG/LTR方法设计对象模型 ZP/LTR方法

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国航空旅游销售渠道结构及发展趋向研究

改革与战略 2008年第8期24卷 120-122,119页

作者：冯郑凭华南师范大学增城学院经济系广东广州511363

文章主要从航空旅游销售渠道中的两个最重要成员:航空代理人和旅行社的角度,探析我国航空旅游销售渠道结构的特征,以及不同成员在该渠道结构功能中的差异。同时对影响航空旅游销售渠道结构变迁的要素和所存问题展开探讨。随着信息技术... 详细信息

文章主要从航空旅游销售渠道中的两个最重要成员:航空代理人和旅行社的角度,探析我国航空旅游销售渠道结构的特征,以及不同成员在该渠道结构功能中的差异。同时对影响航空旅游销售渠道结构变迁的要素和所存问题展开探讨。随着信息技术的快速发展,代表着航空旅游销售渠道重要环节的航空代理和旅行社业将朝着更加规模化、专业化、网络化、信息化和规范化的方向发展。那些在该渠道结构中技术含量低、旅游市场功能弱和服务效率差的中间环节势必面临淘汰的过程。

关键词：航空旅游销售渠道结构特征发展趋向