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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...

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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

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17th Chinese Intelligent systems Conference, CISC 2021

作者： Liu, Binye Wang, Jinlong Wu, Kaitian Xu, Zhezhuang College of Electrical Engineering and Automation Fuzhou University Fuzhou350000 China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China

ISBN: (纸本)9789811663192

The robots have been used in the inspection of industrial wireless sensor networks (IWSNs), that includes data collection and wireless charging. The sensor nodes are always densely deployed and their appearances are similar, thus it is a non-trivial challenge to identify a specific node by the machine vision. To solve this problem, we propose to use the proximity estimation algorithm, which uses wireless signals to estimate neighbor nodes, to help the robot to identify a specific node in the network. The algorithm is deployed a patrol inspection testbed with a mobile robot and multiple sensor nodes, and the experiments are executed to verify its performance. The experimental results show that the proximity estimation algorithm is a reasonable solution to identify similar nodes in the inspection of the IWSN. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Inspection

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A CONCEPTUAL MANAGEMENT FRAMEWORK OF MULTI-SOURCE DATA IN R&D PROCESS 1

A CONCEPTUAL MANAGEMENT FRAMEWORK OF MULTI-SOURCE DATA IN R&...

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1st International Conference on Mechanical system Dynamics, ICMSD 2022

作者： Chen, Zishuo Zhu, Liangcong Sun, Hao Li, Hailong Bai, Yansong Wen, Hao Xu, Shidong State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing China Shanghai Aerospace System Engineering Institute Shanghai China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

It has been 10 years since the digital thread concept was brought up. By connecting various data in different fields, digital thread is expected to solve the problem of "information silos" in the R&D process and different fields such as design and manufacturing, potentially generating an average annual output value of tens of billions of dollars for the industry. However, due to various factors such as multi-source heterogeneous data, and complex production environments, there is still no unified framework that can adapt to different scenarios. In addition, traditional data storage architectures are difficult to cope with massive amounts of data throughout the product lifecycle. To solve the problem, a conceptual management framework of multi-source data is developed based on digital thread technology, where multi-source structured data are converted into JSON data format and stored in a unified storage mode. For unstructured data, only their addresses are stored in databases. At the same time, to improve the quality of data management, the meta-database is used to store meta information related to the data. In addition, front-end and back-end data interaction and 3D model visualization are achieved based on the Django framework. The conceptual framework is demonstrated by using an illustrative case of a part design. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Information management

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Minimal Curvature and Range Path Connecting Two Oriented Points

Minimal Curvature and Range Path Connecting Two Oriented Poi...

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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Guo, Kun Xu, Cheng Wei, Zhenyan Xu, Heng Beijing Institute of Mechanical and Electrical Engineering Beijing100074 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Bejing100074 China

ISBN: (纸本)9789811694912

Time and acceleration constraints have been extensively considered in flight vehicle path planning area. However, the limits of the required acceleration guaranteeing the existence of a path has not been fully studied yet. This paper presents an algebraic proof of the minimax curvature path connecting two oriented points with one inflection point, and then the minimal required acceleration and flight time are analyzed for all planar scenarios. It is revealed that for some geometry conditions, there exists a specific combination of curvature and range limits, while for other conditions, this combination can change continuously by increasing one and decreasing another. For all cases, the optimal paths are concatenations of circular arcs of equivalent radii in different forms, which means that to reduce the acceleration and flight time to the utmost, the overload should be evenly distributed along the whole path. The results in this paper can support fast on-line path planning in the presence of incident direction constraint with limited maneuverability and fuel. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Motion planning

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Impact of Routing on EMI Resilience in High-Speed Digital PCBs: A Time-Domain Analysis

Impact of Routing on EMI Resilience in High-Speed Digital PC...

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International Ural Conference on Measurements (UralCon)

作者： Mikhail S. Murmansky Nikita O. Kuzmin Alexander M. Zabolotsky Department of television and control Tomsk State University of control System and Radioelectronic Tomsk Russia Research Laboratory of “Safety and Electromagnetic Compatibility of Radioelectronic Facilities” Tomsk State University of control System and Radioelectronic Tomsk Russia Department of Ultra High Frequency and Quantum Radio Engineering Tomsk State University of control System and Radioelectronic Tomsk Russia

ISBN: (数字)9798350386028

ISBN: (纸本)9798350386035

This paper investigates the electromagnetic interference (EMI) resilience of various microstrip transmission line (MSL) routing schemes commonly used in high-speed digital applications. The study focuses on minimizing crosstalk and enhancing signal integrity by optimizing the geometry and coupling between conductors. Traditional routing methods like meander and spiral configurations are compared against a novel scheme characterized by increased spacing between conductor turns. This proposed scheme allows for component placement beneath the transmission lines, potentially reducing overall printed circuit board (PCB) size. Quasi-static simulations are conducted using the TALGAT environment to evaluate the time-domain response of the different routing schemes to a Gaussian pulse excitation with frequencies ranging from 0 to 6 GHz. N-norms are employed to quantify the pulse characteristics and assess their potential impact on circuit performance and reliability. The results demonstrate that the meander configuration exhibits the lowest level of crosstalk, while spiral configurations show higher crosstalk, especially at high trace densities. Increasing the spacing between conductor turns in the proposed scheme effectively reduces crosstalk and enables modal decomposition, leading to a more desirable signal response.

关键词： Microstrip filters Time-frequency analysis Spirals Electromagnetic interference Printed circuits Crosstalk Conductors Routing Time-domain analysis Resilience

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MODEL PARAMETER IDENTIFICATION OF BOLTED STRUCTURES BASED ON CREDIBILITY OPTIMIZATION 1

MODEL PARAMETER IDENTIFICATION OF BOLTED STRUCTURES BASED ON...

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1st International Conference on Mechanical system Dynamics, ICMSD 2022

作者： Zhang, Yonglei Zhang, Wenfeng Wen, Hao Xu, Shidong State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing China Shanghai Institute of Aerospace System Engineering Shanghai China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

The structures assembled by bolted joints may have complex nonlinear characteristics that should not be neglected, especially in aerospace applications. The Bouc-Wen model is employed to describe the bolted joint, and the parameters of which are further updated via test data. In the process of optimization, the credibility concept is introduced and the credibility evaluation method based on Theil's Inequality Coefficient is used to design the object function. The credibility of the optimized model is significantly improved. The results indicate that the Bouc-Wen model has a higher confidence level than the linear model. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Bolted joints

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Efficient Heuristic Algorithm for Precedence-Constrained Multi-Robot Task Assignment

Efficient Heuristic Algorithm for Precedence-Constrained Mul...

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第43届中国控制会议

作者： Xiaoshan Bai Baode Li Fuqiang Liu Li Qiu Guangzhong Cao College of Mechanical and Control Engineering Shenzhen University Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots Shenzhen University National Engineering Laboratory for Big Data System Computing Technology Shenzhen University College of Mechanical and Vehicle Engineering Chongqing University

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

Due to the widespread application of multi-robot systems, the efficient task assignment for a team of robots has become particularly critical for performing complex tasks. This paper studies the task assignment problem for multiple robots to visit a group of target locations with precedence constraints, which determine the order/sequence in which certain target locations need to be visited before others. A marginal-cost-based heuristic algorithm is developed to minimize the time for the robots to visit the last target location. The algorithm first uses a timestamp strategy to update the anticipated visiting time of each assigned target and the corresponding earliest time that each successor target can be visited under the precedence constraints. Then, it utilizes the topological sorting technique and the marginal-cost-based mechanism to insert the feasible target that induces the minimum marginal cost into the robots' current routes. Numerical simulations demonstrate the effectiveness of the proposed algorithm compared with the popular greedy algorithm and the existing simple iterative auction algorithm.

关键词： Multi-robot task assignment Precedence constraints Heuristic algorithm Marginal cost

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Research on Multi-target Association Tracking Algorithm Based on IMM

Research on Multi-target Association Tracking Algorithm Base...

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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Siting, Peng Lei, Li Yichao, Ma Jun, Ren Beijing Electro-Mechanical Engineering Institute Beijing100074 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9789811694912

Radar sensors are important detection and tracking equipment in national defense work. There are multiple targets in actual combat scenarios. It is necessary to quickly and accurately capture suspicious targets in the reconnaissance area and track them in real time. Complex electromagnetic interference conditions and multi-target tracking requirements pose a great challenge to track correlation. This paper establishes a multi-target maneuver scenario and uses a joint probabilistic data interconnection algorithm based on interactive multi-model (IMM) to perform multi-target tracking. Correlation tracking, simulation results show that the algorithm is used to correlate the target maneuver and measurement information with good accuracy. Interactive multi-model filtering can mix the estimation results of each filter to generate a fused state estimation result. The description of the model is more accurate, which improves the tracking accuracy and tracking stability of the algorithm. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Kalman filters

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RESEARCH ON VIBRATION DIAGNOSIS METHOD OF VALVE LEAKAGE FORMARINE DIESEL ENGINE 28

RESEARCH ON VIBRATION DIAGNOSIS METHOD OF VALVE LEAKAGE FORM...

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28th International Congress on Sound and Vibration, ICSV 2022

作者： Lei, Hu Jianguo, Yang Yonghua, Yu Shijie, Shen Nao, Hu School of Naval Architecture Ocean and Energy Power Engineering Wuhan University of Technology Wuhan430063 China Laboratory of Electronic Control System for Low-Speed Engine National Engineering Laboratory of Power Systems of Ships and Ocean Engineering Wuhan430063 China

ISBN: (纸本)9789811850707

poor working conditions with high temperature and pressure are easy to cause valve leakage of marine diesel engine. Gas leakage in the cylinder leads to a drop in power and a rise in local temperature, and the valve would be blown off in severe cases, resulting in an irreversible fault. In the paper, Normal and different levels of the exhaust valve leakage of the marine diesel engine are designed and simulated in test bench, the accelerometer is arranged on the cylinder head near the valve, and the vibration signals with the different levels of the valve leakage under different working conditions of the diesel engine are obtained. The time-domain, frequency-domain and wavelet packet analysis methods are used to extract characteristic parameters (CPs) of different levels. With the CPs of the different methods classified, the fault diagnosis model of the valve leakage based on support vector machine (SVM) is established, and its diagnosis accuracy is analysed. The research shows that the model with the multi-dimensional feature vectors of the valve leakage based on SVM has a diagnostic accuracy of above 97.5%, which can better meet the requirement of the valve leakage diagnosis under different working conditions. © International Institute of Acoustics and Vibration (IIAV), 2022.

关键词： Diesel engines

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Radar Target Selection Strategy Based on Improved Subjective Bayesian Reasoning

Radar Target Selection Strategy Based on Improved Subjective...

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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Li, Wen Pei, Hucheng Qu, Guangzhou Hao, Mingrui Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China Beijing Electro-Mechanical Engineering Institute Beijing100074 China

ISBN: (纸本)9789811694912

In order to deal with the influence of dilution passive decoy jamming on target selection of UAV radar, and to enable UAV radar have more independent decision-making ability to acquire the naval ship correctly in an ocean battlefield scene containing single real ship and multiple passive decoys, a method which established the mathematical simulation model of jamming scene, and used the model as the fitness function to calculate the adequacy measurement parameters of subjective Bayesian reasoning through genetic optimization algorithm is proposed. This method is applied to UAV radar target selection, compared with traditional target selection methods using single target feature, this method can improve the accuracy of ship acquisition by comprehensive using multi-dimensional target features. Moreover, this method can further improve the joint acquisition accuracy by setting multiple adequacy measurement parameters for different radars, which prove that the method can achieve the purpose of improving the success rate of UAV radar against dilution passive decoy jamming. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Radar

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