检索结果-内蒙古大学图书馆

2024 IEEE International Conference on control science and Systems Engineering, ICCSSE 2024

作者： He, Longlong Xu, Tianze Wu, Yue Gao, Jiani Wang, Yafei Pan, Ruiyu Xi'an University of Science and Technology Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Detection and Control Xi'an China

ISBN: (纸本)9798331517199

As a vital energy source, coal mines are essential to the energy industry. However, the process of fully mechanized coal mining is notoriously harsh, which poses significant challenges to efficient and safe operations. In this context, hydraulic support operators play a crucial role in ensuring the stability and safety of the working face, where potential safety issues from operator errors or external interferences necessitate the adoption of smart mining practices. To address these challenges, this paper proposes a framework for a distributed hydraulic support control system based on a multi-agent system (MAS). First, by constructing this distributed multi-agent system within fully mechanized mining, the interactive relationship among hydraulic supports has been systematically delineated. Second, game theory is employed to inform decision-making regarding hydraulic support behaviors, enhancing both the autonomy and cooperation of the supports. Finally, the proposed model is analyzed and validated by maximizing the utility function, aiming to improve the efficiency and intelligence of fully mechanized mining operations. This comprehensive approach aims to ensure safer and more efficient coal mining practices through advanced technology integration and strategic decision-making. © 2024 IEEE.

关键词： Coal mines

来源：评论

学校读者我要写书评

暂无评论

Sea Surface Scattering Characteristics Based on Slope Statistics of Sliding Window 13

Sea Surface Scattering Characteristics Based on Slope Statis...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Xie, Yue Li, Tie Tian, Bo Li, Tuan Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418126

In view of the insufficient applicability of the current engineer laser short-range sea surface scattering echo related calculation model, it is impossible to effectively evaluate the performance of the system under different conditions, the simulated wave pool environment is used to obtain the detection system at a fixed height and attitude. Data has limitations such as limited sample points and high funding. This paper proposes a sea surface scattering echo model based on three-point sliding window function statistics. By discretizing the sampling of the wave cross section and obtaining the slope statistics under different intersection conditions, the ray tracing method and the slope value are used to determine the effective surface element. The statistical value of the detection probability and the value of the SNR interval under different sea conditions and attitude angles are obtained by simulation, this provides adaptability assessment and related technical index reference for laser short-range sea surface detection. © 2021 IEEE.

关键词： Surface scattering

来源：评论

学校读者我要写书评

暂无评论

A novel DOA estimation algorithm using directional antennas in cylindrical conformal arrays

引用

Defence technology（防务技术） 2021年第3期17卷 1042-1051页

作者： Xiao-feng Gao Ping Li Xin-hong Hao Guo-lin Li Zhi-jie Kong Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing100081China China Academy of Launch Vehicle Technology Beijing100076China

In this paper, a novel direction of arrival(DOA) estimation algorithm using directional antennas in cylindrical conformal arrays(CCAs) is proposed. To eliminate the shadow effect, we divide the CCAs into several subarrays to obtain the complete output vector. Considering the anisotropic radiation pattern of a CCA, which cannot be separated from the manifold matrix, an improved interpolation method is investigated to transform the directional subarray into omnidirectional virtual nested arrays without non-orthogonal perturbation on the noise vector. Then, the cross-correlation matrix(CCM) of the subarrays is used to generate the consecutive co-arrays without redundant elements and eliminate the noise vector. Finally, the full-rank equivalent covariance matrix is constructed using the output of co-arrays,and the unitary estimation of the signal parameters via rotational invariance techniques(ESPRIT) is performed on the equivalent covariance matrix to estimate the DOAs with low computational complexity. Numerical simulations verify the superior performance of the proposed algorithm, especially under a low signal-to-noise ratio(SNR) environment.

关键词： Direction of arrival(DOA) Conformal antenna array Interpolation technique Nested array

来源：评论

学校读者我要写书评

暂无评论

A Power Supply Method for Detonation control Module with Threshold of Opening and Closing Voltage

A Power Supply Method for Detonation Control Module with Thr...

引用

IEEE International Conference on Electronic Information and Communication technology (ICEICT)

作者： Pu Liu Tengfei Xu Kang Zhang Science and Technology on Electromechanical Dynamic Control Laborator Xi’an Institute of Electromechanical Inforation Technology Xi’an China

ISBN: (数字)9798350384437

ISBN: (纸本)9798350384444

Aiming at the shortcomings of power supply circuit composed of energy storage capacitor and ordinary linear voltage regulator, such as slow power down and input voltage fluctuation affecting output voltage, a power supply method for detonation control module with threshold of opening and closing voltage is proposed. In this method, a 3.3V linear regulator with threshold value of opening and closing voltage is introduced, which is realized by combining energy storage capacitor and 5V linear regulator. Set the starting and closing voltage threshold to control the enabling pin of 3.3V linear voltage regulator by using resistance voltage divider. When the input voltage rises to the starting voltage, the regulator will start quickly and keep the output voltage stable. When the input voltage drops to the closing voltage value, the output voltage of the voltage regulator will power down quickly. The 3.3V linear regulator with opening and closing voltage threshold significantly reduces the time that the output voltage follows the input voltage during power on and power off, and effectively reduces the impact of input voltage jitter on the output voltage. The verification results show that the speed of powering on and powering off of the circuit developed by the power supply method can meet the power supply requirements of the detonating control module, and the power supply voltage is stable, which can effectively reduce the risks of program runaway and "crash" during powering on and powering off of the microcontroller.

关键词： Resistance Regulators Voltage fluctuations Power supplies Simulation Capacitors Jitter

来源：评论

学校读者我要写书评

暂无评论

Application of Target Electromagnetic Scattering Characteristics in Short-Range dynamic Detection 13

Application of Target Electromagnetic Scattering Characteris...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Hu, Wenhui Li, Gang Li, Wei Tian, Bo Li, Tie Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418126

In view of the way that radio fuse probe target for echo information with dynamic scanning detection in the scene of near-field, this paper designed an experiment of the application scheme, which the scheme used radar to image electromagnetic scattering from a target of interest, the complex echo signals in the detection results were divided according to the time series and the RCS mean value of the corresponding region was calibrated, thus the time-resolved/part-resolved target information can be used in the design and verification of near-field detector, providing a new method for the application of target characteristic information in the process of short-range dynamic detection. © 2021 IEEE.

关键词： Electromagnetic wave scattering

来源：评论

学校读者我要写书评

暂无评论

The Application of Immune Genetic Algorithm in BP Neural Network 6

The Application of Immune Genetic Algorithm in BP Neural Net...

引用

6th IEEE International Conference on Intelligent Computing and Signal Processing, ICSP 2021

作者： Yichang, Zhao Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9780738143705

Randomly generating the initial weights and thresholds of the neural network will bring uncertainty to the network. We used genetic algorithms to optimize the initial weights and thresholds of the neural network. However, the genetic algorithm may have the problem of premature population maturity during its operation, that is, the algorithm has converged before reaching the global optimal solution. To this end, the immune genetic algorithm is used to optimize the initial weights and thresholds of the neural network to avoid premature maturity of the population. A binary classification problem model is established. From the simulation training results, the use of immune genetic algorithm to optimize the BP neural network can more effectively prevent the network from falling into a local minimum during training, improve the network convergence speed, and complete it more accurately and stably Two classification problems. © 2021 IEEE.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Investigation on Effect from variational Electromagnetic Parameters of absorbing patch for RCS of Almond model 13

Investigation on Effect from variational Electromagnetic Par...

引用

13th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2021

作者： Li, Wei Li, Tie Huang, Dengdian Xie, Yue Science and Technology on Electromechanical Dynamic Control Laboratory Xian China

ISBN: (纸本)9781665418126

The RCS of the almond model which was affected by the change from electromagnetic parameters (ϵ and mu) of the absorbing patch was researched, and the moment method was utilized. The varepsilon andμ of the absorbing patch can be measured and the values were assumed to vary with equal difference in the interval of 5%30%, the measured values of varepsilon and mu worked as variable which were used to calculate the RCS of the almond model with the different varepsilon and mu of the patch. Here, two almond model RCS were obtained, one is circumferential RCS which generated by the gradient of varepsilon and mu of absorbing patch, and the other Radar Cross-Section (RCS) generated by the known electromagnetic parameter measurements. Comparing the two RCS mentioned above, the calculated results show that for the HH polarization, the undulation values of the almond model RCS vary within 0.4dB when the real part of varepsilon and mu of the absorbing patch vary within 5%-30% at 10GHz, and for the VV polarization, the undulation values changes within 2.5 dB, Moreover, the polar differences of both polarizations decrease with the increase of the real part of the varepsilon and mu, in both polarization modes, the polar RCS is sensitive to the variation of varepsilon and mu, and the VV polarization is much more sensitive than the HH polarization. © 2021 IEEE.

关键词： Radar cross section

来源：评论

学校读者我要写书评

暂无评论

Experimental Research on Millimeter Wave Scattering Characteristics of Small UAV

Experimental Research on Millimeter Wave Scattering Characte...

引用

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

作者： Wenhui Hu Bo Sun Changhao Ma Yongdiao Wen Jing Li Tie Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Institute of Mechanical and Electrical Information Technology Xian China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In view of the weak echo and low detectability of low, small and slow targets, this paper takes a typical small UAV as the target, carries out low-altitude flight detection and Ka-band scattering imaging experiments based on the turntable model, and obtains its dynamic scattering characteristics and high-resolution two-dimensional scattering imaging. The results can provide basic data support for subsequent target detection and recognition.

关键词： Shafts Target recognition Antenna theory Scattering Object detection Autonomous aerial vehicles Cameras Ka-band

来源：评论

学校读者我要写书评

暂无评论

Experimental study on permeability evolution of deep high-stressed coal under major horizontal stress unloading paths

引用

International Journal of Mining science and technology 2024年第11期34卷 1495-1508页

作者： Chao Liu Jiahao Zhang Songwei Wu Jinghua Qi Beichen Yu Liang Wang School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Disaster Prevention and Control Ministry of EducationShandong University of Science and TechnologyQingdao 266590China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Theory and Technology on Coal and Rock Dynamic Disaster Prevention and Control National Mine Safety AdministrationChina University of Mining and TechnologyXuzhou 221116China

Both bulk stress(σ_(i i))and stress path(SP)significantly affect the transportation characteristics of deep gas during reservoir pressure ***,the experimental study of horizontal stress unloading on seepage behavior of gas-bearing coal under constantσi i-constraints is *** results show that coal permeability is affected by horizontal stress anisotropy(σ_(H)≠σh),and the contribution of minor horizontal stress to permeability is related to the differential response of horizontal *** slippage phenomenon is prominent in deep high-stress regime,especially in low reservoir pressure.σ_(i i)and SP jointly determine the manifestation of slippage effect and the strength of stress sensitivity(γ)of *** reservoir implies an incremental percentage of slip-based permeability,and SP weakens the slippage effect by changing the elastic–plastic state of ***,γis negatively correlated with slippage *** the Walsh model,narrow(low aspect-ratio)fractures within the coal under unloading SP became the main channel for gas seepage,and bring the effective stress coefficient of permeability(χ)less than 1 for both low-stress elastic and high-stress damaged *** the raise of the effective stress,the effect of pore-lined clay particles on permeability was enhanced,inducing an increase inχfor highstress elastic coal.

关键词： True triaxial stress path Constant bulk stress Horizontal stress Effective stress coefficient of permeability Slippage effect

来源：评论

学校读者我要写书评

暂无评论

An Overall Weighted Fusion Algorithm Based on dynamic Optimal Estimation

An Overall Weighted Fusion Algorithm Based on Dynamic Optima...

引用

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

作者： Zehu Wang Guanglin He Yukuan Liu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

Based on the background of cooperative detection of target by multiple UAVs, this paper proposes an efficient multi-sensor data fusion algorithm, which is called the overall weighted fusion algorithm based on dynamic optimal estimation (abbreviated as DOE-OWFA) Based on the weighted fusion by the least squares method, the algorithm makes full use of the state estimation property of Kalman Alter for data processing and state estimation. In order to evaluate the performance of the algorithm, we conducted simulation tests with the help of MATLAB. The simulation results show that the algorithm proposed in this paper has higher fusion accuracy and better robustness compared with the same type of algorithms.

关键词：

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：