检索结果-内蒙古大学图书馆

TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Xu, Shuai Zhang, Chao Zhang, Jing Fei, Hongbo Wu, Le College of Mechanical Engineering Inner Mongolia University of Science and Technology Baotou014010 China Inner Mongolia Key Laboratory for Intelligent Diagnosis and Control of Electromechanical Systems Baotou014010 China

ISBN: (纸本)9783031702341

To solve the problem of low prediction accuracy of the traditional similarity matching method, a similarity matching remaining life prediction method combining monotonicity and Spearman correlation is proposed. Firstly, monotonicity is used to screen the time domain and frequency domain features of the bearings, and then Spearman correlation is used to extract the nonlinear relationship of the screened features. Next, the extracted features are fused using principal component analysis to construct the health indexes that characterize the degradation trend of the bearings. An autoregressive moving model is then used to construct a similarity model, in which the Manhattan distance is used to measure the degree of similarity between the two curves and to make the remaining life estimation. Finally, the validation is carried out on the public dataset PHM2012 dataset and compared with Poly2 and Exp1. The experimental results show that the proposed method can effectively improve the remaining life prediction accuracy, which proves the effectiveness and superiority of the proposed method. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Prediction models

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Strength Calculation and Simulation Study of Threaded Connection of Penetration Fuze

Strength Calculation and Simulation Study of Threaded Connec...

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Artificial Intelligence, Networking and Information technology (AINIT), International Seminar on

作者： Pengzhao Xu Guangsong Ma Sen Wang Shaokang Cui Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350385557

ISBN: (纸本)9798350385564

Aiming at the problem of whether the connection strength of the thread of the penetration fuze is sufficient the operating requirements under the impact load of penetrating multi-layer target plate. Using theoretical calculation and numerical simulation methods, under three different excitation conditions (axial, axial + radial (0.3 times axial), axial + radial (0.6 times axial)) under the impact load of the multi-layer target plate, the shear strength of the thread connecting the screw and the fuze shell and the extrusion strength of the thread tooth surface were studied. The results show that the design margins under the three excitation conditions are 0.9, 0.6 and 0.1, respectively, and all have certain design margins, indicating that the connection thread of the fuze meets the strength requirements when subjected to the impact load of the penetrating multilayer target plate.

关键词： Seminars Simulation Loading Fasteners Numerical simulation Nonhomogeneous media Synchronization

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A sparse moving array imaging approach for FMCW radar with dual-aperture adaptive azimuth ambiguity suppression and adaptive QR decomposition

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Defence technology 2025年

作者： Han, Yanwen Yan, Xiaopeng Wang, Jiawei Zheng, Sheng Yu, Hongrui Dai, Jian Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

Range-azimuth imaging of ground targets via frequency-modulated continuous wave (FMCW) radar is crucial for effective target detection. However, when the pitch of the moving array constructed during motion exceeds the physical array aperture, azimuth ambiguity occurs, making range-azimuth imaging on a moving platform challenging. To address this issue, we theoretically analyze azimuth ambiguity generation in sparse motion arrays and propose a dual-aperture adaptive processing (DAAP) method for suppressing azimuth ambiguity. This method combines spatial multiple-input multiple-output (MIMO) arrays with sparse motion arrays to achieve high-resolution range-azimuth imaging. In addition, an adaptive QR decomposition denoising method for sparse array signals based on iterative low-rank matrix approximation (LRMA) and regularized QR is proposed to preprocess sparse motion array signals. Simulations and experiments show that on a two-transmitter-four-receiver array, the signal-to-noise ratio (SNR) of the sparse motion array signal after noise suppression via adaptive QR decomposition can exceed 0 dB, and the azimuth ambiguity signal ratio (AASR) can be reduced to below −20 dB. © 2025 China Ordnance Society

关键词： Signal to noise ratio

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The Slippage Model of Outer Ring Faults in Deep Groove Ball Bearings Induced by Impact Forces Under Load

The Slippage Model of Outer Ring Faults in Deep Groove Ball ...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Wu, Yangbiao Zhang, Chao Liu, Guiyi Wu, Le Ouyang, Bing Qin, Feifan School of Mechanical Engineering Inner Mongolia University of Science and Technology Baotou014010 China Key Laboratory of Intelligent Diagnosis and Control of Electromechanical Systems in Inner Mongolia Autonomous Region Baotou014010 China

ISBN: (纸本)9783031734069

The study of fault mechanisms plays a crucial role in the field of fault diagnosis. The phenomenon of rolling element slippage is inevitable. In order to more accurately describe the phenomenon of rolling element slippage in the defective area, this paper employs the instantaneous center method and the theorem of three centers to represent the centerline velocity of the rolling element. Due to the change in linear velocity when the rolling element slips, the magnitude of the impact force is calculated according to the principle of collision. Finally, focusing on deep groove ball bearings as the research object, a fault dynamic model is established to simulate the slippage of the rolling element after being subjected to impact force in the defective area. The model is solved using the fourth-order Runge-Kutta method, and the results are simulated. Through experimental simulation analysis, the fault characteristic frequencies obtained from the proposed model are compared with theoretical values, with errors falling within the range of 1 to 2 Hz. Therefore, this provides preliminary validation of the correctness of the proposed model. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Deep groove ball bearings

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Study on the Inversion Method of Rendezvous Parameters Using Near-Field Echo Characteristics

Study on the Inversion Method of Rendezvous Parameters Using...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Juntao Cui Sicheng Gao Chi Zhang Yongdiao Wen Gang Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'an Institute of Electromechanical Information Technology Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In this paper, a rendezvous parameter inversion method based on one-dimensional convolutional neural network is proposed by using near-field rendezvous echo data. The simulated near-field rendezvous echo data of typical targets are preprocessed and data enhanced to form a training set. A one-dimensional convolutional neural network for inversion of rendezvous parameters is designed and trained. The influence of different network structures on the accuracy of inversion parameters is analyzed. The results show that the inversion method based on near-field echo characteristics has good robustness and accuracy.

关键词： Training Accuracy Antenna theory Neural networks Robustness Convolutional neural networks

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Analysis of the Response Characteristics of Ultra-Wideband Radio Fuze to Interference Signals 4

Analysis of the Response Characteristics of Ultra-Wideband R...

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4th International Conference on Defence technology, ICDT 2024

作者： Hao, Shijun Xie, Jialiang Liang, Yanbin Wu, Kaiwei Yang, Bing Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Air Force Armament Department Shenyang Regional Military Representative Bureau Jilin Regional Military Representative Office Jilin China

The response characteristics of the fuze to the interference signal with reasonable characteristic parameters are similar to the real echo signal, which may lead to the confusion of signal processing and recognition system. To solve this problem, this paper analyzes the influence of characteristic parameters of interference signal on the response characteristics of fuze in detail from two perspectives of time domain and frequency domain, Based on the analysis of receiver principle, the amplitude-frequency response model of sampling integral differential circuit is established, and the response characteristics of interference signal are analyzed from the perspective of frequency domain. Based on the analysis of the time-frequency characteristics of the echo signal of the UWB fuze, a time-frequency function cutting method is proposed to evaluate the anti-jamming performance of the UWB fuze. This methodology was applied to the evaluation of the anti-jamming performance of the UWB fuze to sinusoidal amplitude-modulation interference signal and the results show that the theoretical analysis and simulation results are consistent, and the research provides theoretical guidance for the anti-interference of fuze. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Jamming

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Consensus Positive Position Feedback Robust control for Vibration Reduction Under Fault Tolerance

Consensus Positive Position Feedback Robust Control for Vibr...

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Artificial Intelligence and Automation control (AIAC), International Conference on

作者： Dalong Tian Dong Xue Yuwei Li Hang Shen Jiamin Xue Han Du Xi'an Institute of Electromechanical Information Technology Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (数字)9798331529147

ISBN: (纸本)9798331529154

In this study, active vibration robust control based on the mutual collaboration of agents under fault tolerance for large flexible smart truss structures (LFSTS) is investigated. First, the electromechanical coupling dynamic equation of the active truss is analyzed based on the finite element method. Subsequently, the positive position feedback (PPF) and consensus positive position feedback (CPPF) algorithms are compared, analyzing the reduction of the vibration relying on the optimal PZT stack actuator's position when agents collaborate in the designed communication topology network. Finally, simulations considering agent failure are performed to verify the fault tolerance and robustness of the active vibration control system. Compared with free vibration and PPF method, the results show that CPPF exhibits robust performance in rapidly suppressing the vibration of the LFSTS, which considerably enhances system reliability and improves pointing accuracy.

关键词： Vibrations Robust control Fault tolerance Network topology Fault tolerant systems control systems Vibration control Robustness Topology Steady-state

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Current status and trends in the study of penetration fuze initiation control methods

Current status and trends in the study of penetration fuze i...

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2023 International Conference on Automation control, Algorithm, and Intelligent Bionics, ACAIB 2023

作者： Lu, Ying Sui, Li Wang, Dongya Shi, Gengchen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China Northwest Industries Group Co. Ltd. Xi’an710043 China

ISBN: (纸本)9781510667662

With the development of the times, the concept of modern warfare is constantly changing and precision strikes have become an important mode and means of combat on the modern battlefield. It is of great strategic value to research and realise hard target penetration munitions that can strike accurately and effectively destroy high-value targets. The key to the efficient destruction of hard targets by penetration munitions is the penetration fuze, the core of which is the initiation control strategy in high overload conditions. By investigating the current state of research on intrusion fuze initiation strategies, the future trends of layer counting identification and cavity counting identification are envisaged. © 2023 SPIE.

关键词： Ammunition

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Object Detection Based on Digital Twin-Based Road Scenarios

Object Detection Based on Digital Twin-Based Road Scenarios

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control, Electronics and Computer technology (ICCECT), IEEE International Conference on

作者： Zhang Yu Chen Huimin Wang Weihan Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (数字)9798350380958

ISBN: (纸本)9798350380965

With the rapid development of artificial intelligence and digital technology, digital twins are becoming more and more widely used in various fields, and have high application value in industrial production, architectural design and other fields. There are few datasets of extreme scenarios used in traditional object detection and vehicle autonomous driving training, resulting in unsatisfactory results of object detection and autonomous driving technology in complex environments. In this paper, a digital twin model of the road scene is built based on the rules of City Engine and the Unreal Engine 4 platform, which can be used to build a model of complex road scenes and shorten the model construction cycle. Based on the constructed digital twin model, the target detection task is carried out, and it is verified that the target detection and autonomous driving tests can be carried out in the digital twin model. It provides ideas for solving the problem of insufficient testing of autonomous driving and object detection tasks in complex and extreme scenarios.

关键词： Training Roads Urban areas Object detection Digital twins Task analysis Artificial intelligence

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Effect of a typical smoke screen on pulsed laser fuze echoes 9

Effect of a typical smoke screen on pulsed laser fuze echoes

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9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Shuai, Chen Mingkai, Yue Huimin, Chen School of Equipment Engineering Shenyang Ligong University Liaoning Shenyang110159 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510664432

In order to analyze the backscattering characteristics of pulsed laser fuze in typical smoke, copper powder and iron powder with a particle size range of 3~15 µm were selected, the detection model of pulsed laser fuzes in typical smoke was established based on Mie scattering theory and Monte Carlo method. The pulsed laser fuze is simulated to scatter echoes behind smoke curtains with different detection distances, different smoke screen thicknesses and different emitting laser pulse widths, and the echo intensities of copper powder smoke screens and iron powder smoke screens under the same smoke screen conditions are compared. The results show that the normalized echo intensity of copper powder smoke screen and iron powder smoke screen is negatively correlated with the detection distance. It is positively correlated with smoke screen thickness and emitted laser pulse width. In addition, under the same smoke screen environmental conditions, the echo intensity of the iron powder smoke screen is significantly stronger than that of the copper powder smoke screen, which can be explained that compared with the iron powder, copper powder is more suitable for use as a smoke generator material, the result can provide support for the anti-smoke interference of the laser fuze. © 2023 SPIE.

关键词： Particle size

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