检索结果-内蒙古大学图书馆

Vibration control of fluid-conveying pipes: a state-of-the-art review

Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1423-1456页

作者： Hu DING J.C.JI Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Shaoxing Institute of Technology Shanghai UniversityShaoxing 312074Zhejiang ProvinceChina Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China School of Mechanical and Mechatronic Engineering University of Technology SydneyNew South Wales 2007Australia

Fluid-conveying pipes are widely used to transfer bulk fluids from one point to another in many engineering *** are subject to various excitations from the conveying fluids,the supporting structures,and the working environment,and thus are prone to vibrations such as flow-induced vibrations and acoustic-induced *** can generate variable dynamic stress and large deformation on fluid-conveying pipes,leading to vibration-induced fatigue and damage on the pipes,or even leading to failure of the entire piping system and catastrophic ***,the vibration control of fluid-conveying pipes is essential to ensure the integrity and safety of pipeline systems,and has attracted considerable attention from both researchers and *** present paper aims to provide an extensive review of the state-of-the-art research on the vibration control of fluid-conveying *** vibration analysis of fluid-conveying pipes is briefly discussed to show some key issues involved in the vibration ***,the research progress on the vibration control of fluid-conveying pipes is reviewed from four aspects in terms of passive control,active vibration control,semi-active vibration control,and structural optimization design for vibration ***,the main results of existing research on the vibration control of fluid-conveying pipes are summarized,and future promising research directions are recommended to address the current research *** paper contributes to the understanding of vibration control of fluid-conveying pipes,and will help the research work on the vibration control of fluidconveying pipes attract more attention.

关键词： fuid-conveying pipe vibration passive control nonlinear energy sink(NES) active control semi-active control

来源：评论

学校读者我要写书评

暂无评论

Carrier-Based UAV Landing via Exploratory Grey Wolf Optimized Model Prediction control Scheme

Carrier-Based UAV Landing via Exploratory Grey Wolf Optimize...

引用

International Conference on Guidance, Navigation and control, ICGNC 2024

作者： Sun, Ning Duan, Haibin Huo, Mengzhen Wu, Hao Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing100083 China China Academy of Electronics and Information Technology China Electronics Technology Group Corporation Beijing100041 China

ISBN: (纸本)9789819622115

A carrier-based unmanned aerial vehicle (UAV) landing control system based on nonlinear expanded state observer (NESO) and model predictive controller (MPC) is designed. To compensate for the impact of uncertainty disturbance on control accuracy, NESO is designed, which can effectively estimate the impact of external disturbance on the movement of carrier-based UAV, and exploratory gray wolf optimization is proposed for parameter tuning of the observer. To achieve decoupling between control inputs, MPC is used to establish a carrier-based UAV landing control system. Simulation comparative results demonstrate that the carrier-based UAV control system proposed in the paper performs better than the sliding mode controller scheme that employs a sliding mode observer for landing accuracy. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

TEMPERATURE FIELD ANALYSIS OF MOTOR WITH OIL COOLING BASED ON CFD

TEMPERATURE FIELD ANALYSIS OF MOTOR WITH OIL COOLING BASED O...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Liu, Jiatong Yan, Liang Yu, Zihao He, Xinghua School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China Tianmushan Laboratory Xixi Octagon City Yuhang District Hangzhou310023 China

Increasing the input current is an important way to increase the power density of the motor. However, the increase in current is limited by the heat dissipation capacity of the motor. In this paper, an in-slot direct oil cooling system is proposed, which enhances the heat dissipation capacity of the motor. With direct oil cooling the motor can work stably at high current density. Temperature field analysis of the motor with oil cooling is completed based on CFD. © The Institution of Engineering & technology 2024.

关键词： Cooling systems

来源：评论

学校读者我要写书评

暂无评论

Health Monitoring for Variable Pitch Systems of Wind Turbine Using Multi-layer Perceptron Strategy

Health Monitoring for Variable Pitch Systems of Wind Turbine...

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Feng, Tao Liu, Yishi Li, Qingdong Ren, Zhang Duchengweiye Group Co. Ltd. Beijing100010 China School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beihang University Beijing100191 China

ISBN: (纸本)9789811966125

This paper combines the artificial intelligence algorithm with the modeling and simulation for variable pitch systems of wind turbine, and proposes a fault prediction using the artificial neural network technique of multi-layer perceptron. The operating principle of the variable pitch system is analyzed by building the dynamic model, and the fault detection data of the system is obtained. Then, the artificial neural network of multi-layer perceptron is trained with limited data set. The estimated value of pitch angle can be accurately predicted. The residual error can be obtained by comparing the pitch angle predicted by the artificial neural network and the actual pitch angle output of the system model. The system fault detection results can be obtained according to the fault decision-making index. The proposed method can detect and isolate the fault of complex pitch system accurately with uncertain factors, such as disturbance, and predict the change of fault amplitude effectively. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

A Joint Longitudinal and Lateral Guidance Scheme for Reentry Gliding Phase of Hypersonic Vehicles

A Joint Longitudinal and Lateral Guidance Scheme for Reentry...

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Wang, Ziyu Wu, Yunjie Duan, Jingqi State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Laboratory Beijing100191 China Large Aircraft Advanced Training Center Beihang University Beijing100191 China

ISBN: (纸本)9789811966125

A joint longitudinal and lateral guidance law design scheme is proposed for the reference trajectory tracking problem of the reentry gliding phase of hypersonic vehicles. With respect to the longitudinal and lateral motion model of the hypersonic vehicle, a longitudinal guidance law based on the Global Fast Terminal Sliding Mode (GFTSM) algorithm and a lateral guidance law based on the Extended State Observer (ESO) is designed respectively, which are combined to get the bank angle for the hypersonic vehicle and obtain the final guidance scheme. From theoretical analysis, it shows that the guidance scheme has the characteristics of global rapidity and finite-time convergence, and both longitudinal and lateral guidance law are robust to system uncertainties which are caused by certain parameter perturbation and external interference. The effectiveness and superiority of this joint guidance scheme compared to traditional guidance method are verified by simulation experiments using the specific gliding reentry model and reference trajectory of a hypersonic vehicle. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hypersonic vehicles

来源：评论

学校读者我要写书评

暂无评论

THE DISPERSION CHARACTERISTICS OF INFECTIOUS DROPLETS IN A CIVIL aircraft CABIN WITH DIFFERENT AIR SUPPLY RATES

THE DISPERSION CHARACTERISTICS OF INFECTIOUS DROPLETS IN A C...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Li, Pei Sun, Jianhong Zheng, Daren Xu, Changyue Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China Key Laboratory of Civil Aviation Emergency Science and Technology CAAC Nanjing University of Aeronautics and Astronautics Nanjing211106 China

This work presents a simulation of infectious droplet dispersion in a civil aircraft cabin with the Euler-Lagrangian method. The influence of different rates of air supply on the airflow field, droplet dispersion, and concentration distribution of infectious droplets are analysed. The results show the rates of air supply have a significant impact on airflow filed. The area of vortex circulation region in the cabin is reduced. Total mass of infectious droplets in the cabin basically reaches stability after the infector exhales the infectious droplets for 120 seconds. The total mass in the civil cabin is 3.56×10-12 kg with the 6.9 L per second per person and respectively decreased by 4.21% and 22.75% with increasing the air supply rate to 10 L per second per person and 16 L per second per person. The concentration of infectious droplets in each passenger's respiratory zone is examined. The infector located at the middle of the cabin or sitting near the aisle could affect more passengers and thus, the infector is recommended to sit by the window during the epidemic. © The Institution of Engineering & technology 2024.

关键词： Vortex flow

来源：评论

学校读者我要写书评

暂无评论

A Method for Reconstructing The Shape of Wing Panels Based on Fiber Optic Sensors and Tomographic Imaging Principles 15

A Method for Reconstructing The Shape of Wing Panels Based o...

引用

15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Zhan, Jun Zeng, Jie Xiang, Chao Cui, Jinpeng Zeng, Cheng Zhu, Linfeng Lu, Mingyu State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics No. 29 Yudao Street Nanjing210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft System Jincheng AVIC Nanjing China COMAC Beijing Aircraft Technology Research Institute Changping District Xiaotangshan Future Science and Technology City Beijing102211 China

ISBN: (纸本)9798350354010

The aircraft wing structure shape reconstruction method based on discrete strain information not only provides data support for the digital collaborative health monitoring and prediction technology of wing structure but also helps to improve the aerodynamic shape and flight quality of the aircraft, achieve structural stealth, and enhance the pointing accuracy of the on-board conformal antenna. As result, a wing skin panel shape reconstruction method based on the principle of tomographic imaging and strain information perception is proposed. According to the idea of tomographic imaging, a "non-intrusive" layout form that only requires sensors to be arranged on the periphery of the monitoring area is designed, breaking through the limitation that sensors can not be arranged in the monitoring area under special working conditions. A method for constructing the deflection shape function of the wing skin panel based on the concept of synthetic curvature is proposed, solving the problem of error accumulation and elimination of deformation inversion at non-monitoring points of the measured structure caused by the uncertainty of the limited discrete layout of sensors and the choice of interpolation fitting method. On this basis, a model deformation monitoring and inversion system for wing skin panel based on fiber optic grating sensors is constructed. The experimental results show that under the single-end fixed bending and torsion working condition, the average relative error of the panel model shape reconstruction is 4.17%. Under the double-end fixed double-concentrated load working condition, the average relative error of the shape reconstruction is 8.07%. The wing deformation distribution information reconstructed by the method proposed in this paper can be mapped onto the virtual twin model of the wing, providing technical support for the safety assessment, early warning, and on-condition maintenance of the entire service life of key structures of the aircraft. © 2024

关键词： Fixed wings

来源：评论

学校读者我要写书评

暂无评论

Privacy - Preserving Event - Triggered Predefined Time Containment control for Networked Agent Systems 14

Privacy - Preserving Event - Triggered Predefined Time Conta...

引用

14th International Conference on Information science and technology, ICIST 2024

作者： Li, Weihao Yue, Jiangfeng Shi, Mengji Lin, Boxian Qin, Kaiyu School of Aeronautics and Astronautics University of Electronic Science and Technology of China Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu611731 China National Laboratory on Adaptive Optics Chengdu610209 China

ISBN: (纸本)9798350353334

This paper addresses the privacy-preserving event-triggered predefined time containment control problem for net-worked agent systems. A novel containment control scheme is developed that integrates privacy protection with event-triggered mechanisms, optimizing network efficiency b y minimizing un-necessary data transmission while ensuring robust containment within a specified time frame. T he proposed control scheme ensures the confidentiality of agents' information through output masking, thereby maintaining both privacy and control accuracy. Furthermore, it provides a distinct advantage over traditional finite-time and fi xed-time co ntrol me thods by gu aranteeing con-vergence to the desired state within a predefined time, regardless of initial conditions. Finally, some simulation results are given to verify the effectiveness of the proposed containment control scheme. © 2024 IEEE.

关键词： Differential privacy

来源：评论

学校读者我要写书评

暂无评论

A Fault-Tolerant control Scheme for Civil aircraft Based on Prescribed Performance control

A Fault-Tolerant Control Scheme for Civil Aircraft Based on ...

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Duan, Jingqi Wu, Yunjie Wang, Ziyu State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Laboratory Beijing100191 China Large Aircraft Advanced Training Center Beihang University Beijing100191 China

ISBN: (纸本)9789811966125

In this paper, a fault-tolerant control scheme based on prescribed performance control is proposed to solve the pitch angle attitude control problem of large civil aircraft when actuator faults and external disturbances exist simultaneously. Firstly, the longitudinal motion model of civil aircraft with actuator fault is established. Among them, actuator faults and external disturbances are regarded as lumped disturbances. Then, a performance envelope is constructed based on the hyperbolic cosecant function which can adjust the transient convergence rate and the steady convergence rate respectively. In order to achieve fast online estimation of lumped disturbances, an RBF neural network observer is constructed. The introduction of tracking differentiator solves the problems of initial state constraint of prescribed performance control and "differential-explosion" in back-stepping control. After proving the stability of the system from the perspective of theoretical analysis, the simulation of pitch angle control under the condition of abrupt actuator faults and external disturbance is completed based on Boeing 747 longitudinal motion model. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Attitude control

来源：评论

学校读者我要写书评

暂无评论

RESEARCH OF THE CHARACTERISTICS OF THE ACTIVE LOAD-SENSITIVE DRIVE SYSTEM

RESEARCH OF THE CHARACTERISTICS OF THE ACTIVE LOAD-SENSITIVE...

引用

2024 CSAA/IET International Conference on aircraft Utility Systems, AUS 2024

作者： Mou, Quanrun Liu, Xiaochao Wang, Zhenyu Qiu, Zhongyi Li, Juefei Jiao, Zongxia School of Aeronautic Science and Engineering Beihang University Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China Ningbo Institute of Technology Beihang University Ningbo China Science and Technology on Aircraft Control Laboratory Beihang University Beijing China Tianmushan Laboratory Xixi Octagon City Yuhang District Hangzhou310023 China

In this paper, an active load-sensitive valve-controlled variable displacement motor drive system is introduced, aiming at solving the problem of large energy waste in valve-controlled fixed-displacement system. The fixed-displacement system is unable to match the variable load conditions promptly due to the fixed displacement, resulting in serious throttling losses under small load conditions. This study analyses the energy consumption characteristics by establishing a mathematical model of the active load-sensitive drive system. In addition, the nonlinear mapping of displacement and load pressure difference is designed, and simulation verification of comparing active load-sensitive drive system with the valve-controlled fixed-displacement motor drive system is completed. By analysing the simulation results, it can be seen that the active load-sensitive drive system can reduce the average flow rate by 68% and the peak flow rate by nearly 66% under the small load condition, which effectively solves the problem of heavy throttling loss in the valve-controlled hydraulic system. © The Institution of Engineering & technology 2024.

关键词： Energy utilization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：