检索结果-内蒙古大学图书馆

A dynamic control decision approach for fixed-wing aircraft games via hybrid action reinforcement learning

science China(Information sciences) 2025年第3期68卷 197-219页

作者： Xing ZHUANG Dongguang LI Hanyu LI Yue WANG Jihong ZHU Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Department of Precision Instrument Tsinghua University

Autonomous decision-making is crucial for aircraft to achieve quick victories in diverse scenarios. Based on a 6-degree-of-freedom aircraft model, this paper proposes a decoupled guidance and control theory for autonomous aircraft maneuvering, distinguishing between close and long-range engagements. We introduce a method for heading attitude control to enhance stability during close-range interactions and a speed-based adaptive grid model for precise waypoint control in mid-to-long-range engagements. The paper transforms dynamic aircraft interactions into a Markov decision process and presents a hybrid discrete and continuous action reinforcement learning approach. This unified learning framework offers enhanced generalization and learning speed for dynamic aircraft adversarial processes. Experimental results indicate that in a symmetric environment, our approach rapidly achieves Nash equilibrium, securing over a 10% advantage. In unmanned aerial aircraft game control with higher maneuverability, the probability of gaining a situational advantage increases by more than 40%. Compared to similar methods, our approach demonstrates superior effectiveness in decision optimization and adversarial success ***, we validate the algorithm's robustness and adaptability in an asymmetric environment, showcasing its promising application potential in collaborative control of aircraft clusters.

关键词： intelligent air combat unmanned aerial vehicle game dynamic control reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Research on multi-scale simulation and dynamic verification of high dynamic MEMS components in additive manufacturing

引用

Defence technology 2025年 47卷 275-291页

作者： Lv, Sining Feng, Hengzhen Lou, Wenzhong Xiao, Chuan Li, Shiyi Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

Metal Additive Manufacturing (MAM) technology has become an important means of rapid prototyping precision manufacturing of special high dynamic heterogeneous complex parts. In response to the micro-mechanical defects such as porosity issues, significant deformation, surface cracks, and challenging control of surface morphology encountered during the selective laser melting (SLM) additive manufacturing (AM) process of specialized Micro electromechanical System (MEMS) components, multi-parameter optimization and micro powder melt pool/macro-scale mechanical properties control simulation of specialized components are conducted. The optimal parameters obtained through high-precision preparation and machining of components and static/high dynamic verification are: laser power of 110 W, laser speed of 600 mm/s, laser diameter of 75 μm, and scanning spacing of 50 μm. The density of the subordinate components under this reference can reach 99.15%, the surface hardness can reach 51.9 HRA, the yield strength can reach 550 MPa, the maximum machining error of the components is 4.73%, and the average surface roughness is 0.45 μm. Through dynamic hammering and high dynamic firing verification, SLM components meet the requirements for overload resistance. The results have proven that MEM technology can provide a new means for the processing of MEMS components applied in high dynamic environments. The parameters obtained in the conclusion can provide a design basis for the additive preparation of MEMS components. © 2024 China Ordnance Society

关键词： Microchannels

来源：评论

学校读者我要写书评

暂无评论

DBDB: de-bimodal defocus blur in joint infrared-visible imaging

引用

Visual Intelligence 2025年第1期3卷 1-12页

作者： Cao, Zhe Xu, Lixin Zhang, Jin Yang, Biwen Chen, Kaizheng Zhang, Ruiheng State Key Laboratory of Electromechanical Dynamic Control the School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China

Despite the recent accomplishments in joint infrared-visible imaging, the bimodal defocus blur (BDB) phenomenon received scant attention. Our analysis reveals that BDB is predominantly attributable to disparities in optical parameters between cameras, resulting in two primary challenges: incomplete single-modal information and difficulty in cross-modal information interaction. With regard to the former, the infrared modality is the primary victim, as the deblurring networks’ bias toward high-frequency results in erroneous low-frequency reconstruction (e.g., over-sharpening). In the latter case, the relative nature of the blur effect can lead to ambiguity in determining which modality’s information should be prioritized for guidance, and conflicts may arise between the clear components of the blurred image and the blurry components of the clear image. To address these issues, we propose the first de-bimodal defocus blur (DBDB) method, which consists of a low-frequency semantic hold (LSH) module with a pre-trained infrared model and a cross-modal complementary feature induction (CCFI) module driven by a max-min blur entropy loss. LSH is designed to ensure that the low-frequency information captured by the infrared modality does not contain any misleading data, while CCFI facilitates the acquisition of accurate information by means of adaptive adjustment and the loss function. The experimental results of deblurring and downstream tasks on two synthetic datasets demonstrate the superiority of our method. © The Author(s) 2025.

关键词： Defocus blur Image reconstruction Multimodal learning Pre-training model RGBT

来源：评论

学校读者我要写书评

暂无评论

Study on the Characteristics of High Voltage Capacitance in Fuze Electronic Safety System 16th

Study on the Characteristics of High Voltage Capacitance in ...

引用

16th International Conference on Modelling, Identification and control, ICMIC 2024

作者： Yang, Liuzhu Mao, Ruizhi Zhou, Xiaodong Cheng, Xinya Chen, Yao Zhang, Lisha School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing100081 China

ISBN: (纸本)9789819617760

High voltage capacitor discharges serve as the primary source of pulse current in fuze electronic safety systems. This study explores the impact of high voltage capacitors on charging time, discharge time, and pulse discharge capacity in such systems, focusing on characteristics like leakage current and dielectric material. Through simulations of charging and discharging circuits, it was observed that the capacitor's voltage increases when the charging current surpasses the leakage current, eventually reaching a steady-state value when equilibrium is achieved. Analysis of polarization-electric field (PE) curves for various capacitor materials revealed that antiferroelectric material is the most optimal choice for high-voltage capacitors in fuze electronic safety systems, followed by linear material capacitors and ferroelectric material capacitors. Notably, the discharge power of antiferroelectric material capacitors was found to be approximately three times greater than the other two types, making them more conducive to fuze miniaturization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Capacitor bank

来源：评论

学校读者我要写书评

暂无评论

A Spatial Modes Filtering FETD Method for 3-D Periodic Structures

引用

Applied Computational Electromagnetics Society Journal 2025年第2期40卷 96-102页

作者： Wang, Yixin Wei, Bing Fan, Kaihang He, Xinbo Zhao, Sihan Department of Information Technology Shaanxi Police College Xi’an710021 China School of Physics Xidian University Xi’an710071 China School of Information and Communications Engineering Xi’an Jiaotong University Xi’an710049 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an710065 China

– A spatial modes filtering (SMF) finite-element time-domain (FETD) method with periodic boundary condition (PBC) is proposed for efficiently analyzing the electromagnetic characteristics of 3-D periodic structures with partial fine structures. The system matrices of FETD become asymmetrical because of the introduction of PBC, which prevents the system eigenvalue analysis. By decomposing the system matrix into PBC-independent and PBC-related parts, the unstable spatial modes under the given large time step can be found and removed from the symmetrical PBC-independent system matrices. Then the system matrix equation and time marching of the SMF-FETD and SMF-FETD method based on local eigenvalue solution (LES-SMF-FETD) with PBC are obtained. Numerical results illustrate the efficiency and effectiveness of the SMF-FETD method with PBC based on non-uniform mesh for analyzing the transport properties of 3-D periodic structures. © ACES.

关键词： Eigenvalues and eigenfunctions

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Research on tolerance optimization method for aircraft thin-walled components based on improved particle swarm optimization algorithm 10

Research on tolerance optimization method for aircraft thin-...

引用

2024 10th International Forum on Manufacturing technology and Engineering Materials, ICMTEM 2024

作者： Xue, Dong Tian, Dalong Sun, Xing Zhou, Jiangtao Du, Han Xi'An Institute of Electromechanical Information Technology Xi'an710065 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an710065 China Aviation Industry Development Research Center of China Beijing100029 China 210 Institute The Sixth Academy of China Aerospace Science & Industry Corp. Xi'an710065 China

The assembly accuracy of aircraft thin-walled components produced in the same batch is subject to fluctuations influenced by part tolerances and assembly processes. Significant variations in assembly precision can lead to increased assembly adjustment costs, severely affecting both efficiency and overall expenses. However, tolerance optimization that takes into account these fluctuations requires the integration of assembly deviation calculations, characterized by a high demand for large sample sizes and frequent iterative computations, which results in escalated computational costs. In this context, this paper establishes a data-driven mathematical model for tolerance optimization that comprehensively considers fluctuations in assembly accuracy, manufacturing costs, and quality losses, using a surrogate model as the core computational engine. Furthermore, to address the shortcomings of the traditional particle swarm optimization algorithm, namely, its tendency to get trapped in local optima and its insufficient local search capabilities, this study proposes an improved particle swarm optimization algorithm that integrates a chaotic local search strategy and second vibration particles. This enhanced algorithm is applied to the tolerance optimization problem of aircraft thin-walled components. © Published under licence by IOP Publishing Ltd.

关键词： Particle swarm optimization (PSO)

来源：评论

学校读者我要写书评

暂无评论

A review on the preparation and properties of energetic materials for micro pyrotechnic trains

引用

Results in Engineering 2025年 26卷

作者： Liao, Dongjie Lou, Wenzhong Feng, Hengzhen Kan, Wenxing Li, Zhipeng Lu, Yi School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

Micro pyrotechnic train is an energetic microsystem that integrates MEMS control circuits, micro energetic devices, micro safety mechanisms, and micro output charges. It has been actively promoted and applied in space technology, healthcare, and ordnance due to its outstanding advantages of miniaturization, high efficiency, and intelligence. Micro pyrotechnic train mainly achieves functions such as ignition, propulsion, or detonation through the energetic materials filled inside it. As the core of micro pyrotechnic trains, energetic materials and their development have always been a highly concerned subject. Herein, this paper analyzes and summarizes the research progress of advanced energetic materials, such as two-dimensional energetic materials, metastable intermolecular composites and green primary explosives. Moreover, the application of additive manufacturing technology and in-situ synthesis methods (gas-solid phase chemical reactions, electrically assisted chemical reactions) in the preparation of advanced energetic materials was discussed. Furthermore, suggestions regarding the possible future research directions are proposed. © 2025 The Author(s)

关键词： Detonation

来源：评论

学校读者我要写书评

暂无评论

Elastic wave propagation and attenuation characteristics of roof fracture source

引用

Geomechanics and Engineering 2025年第4期40卷 295-305页

作者： Zhang, Peng-Fei Zhao, Tong-Bin Gong, Xu-Fei Tan, Yan Guo, Chuan-Qing College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China Shandong Key Laboratory of Intelligent Prevention and Control of Dynamic Disaster in Deep Mines Shandong University of Science and Technology Qingdao266590 China Energy Group Co. Ltd. Jining No.2 Coal Mine Jining272012 China

Abstract. The propagation attenuation law of elastic waves generated by rock mass fractures in strata is of great significance in explaining engineering problems, such as rock bursts. In this study, a wave velocity model was established based on the actual stratum conditions of the Jining No.2 coal mine in China. The propagation process of different types of elastic waves is simulated using the elastic wave equation and finite difference method. The attenuation coefficients of various elastic wave parameters propagating at different positions were calculated. Based on the calculated results, an attenuation equation for the elastic wave energy is proposed. The results show that the propagation of S-waves and P-waves in strata is similar to each other, and wave pattern transformation occurs at the interface of the strata. The magmatic rocks played a role in channeling and reflecting elastic wave propagation, leading to the occurrence of low-energy aftershocks in the coal seams. The peak displacement, peak stress, and energy density of the elastic wave that propagated to the coal seam after the siltstone layer fracture of the roof of the 3down coal seam decreased to 28%, 25%, and 9% of the source, respectively. The attenuation of elastic wave energy is highly correlated with the propagation distance, and the attenuation equation can be represented as an exponential function. These results are of great significance for revealing the propagation attenuation process of elastic waves in the stratum. © 2025 Techno-Press, Ltd.

关键词： Exponential functions

来源：评论

学校读者我要写书评

暂无评论

Granular Flow in Microfluidic Chips Under Centrifugal Conditions: Dem Simulations and Experiments

SSRN

引用

SSRN 2025年

作者： Liu, Yang Xie, Yushan Wang, Yabin Cen, Mingxiang Wang, Yongqiang Guo, Jialong Chen, Zhengguang School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing100081 China

With increasing emphasis on granular flow mechanisms and precise flow control, studying the behavior of powder particles in micro-hoppers using microfluidic chips extends research scope to the mesoscopic scale. This approach enhances our understanding of local particle behavior through high-speed imaging and flexible geometry design. In this work, we employed discrete element method (DEM) simulations and experiments to investigate granular flow within microfluidic chips, applying centrifugal force to deliver continuous and adjustable driving forces. We mainly explored two micro-hopper geometries filled with zirconium oxide (ZrO2) spherical micro-particles: wedge-shaped and arc-shaped geometries. Effect of the micro-hopper height and the outlet width were investigated as well. Blockage could be observed for the 45° wedge-shaped micro-hopper (WSMH) when the outlet width [[EQUATION]] is less than 3.8 times the particle diameter ([[EQUATION]]). Comparative analysis demonstrates a 40-70% enhancement in mass discharge rate (MDR) for the arc-shaped micro-hopper (ASMH) over the WSMH, due to optimized stress redistribution. A scaling relation between the microchannel width (equivalent to the outlet width of the micro-hopper) and the MDR was established. Experimentally, we introduced a method for fabricating the micro-hopper, employing a high-speed rotating platform (3000 rpm) to drive micro-particle motion, while high-speed cameras enabled real-time flow observation. Experimental results of the interval MDR demonstrated considerable consistency with the simulation. The approach for studying granular flow in microfluidic chips under controlled driving forces offers a new paradigm for investigating both overall and local behaviors of powder particles, thereby advancing our understanding of particle interactions and collective dynamics. © 2025, The Authors. All rights reserved.

关键词： Microfluidic chips

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：