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Non-explosive directional fracturing blasting using coal-based solid waste expanding agent

Journal of Rock Mechanics and Geotechnical Engineering 2025年第6期17卷 3691-3710页

作者： Zhang, Quan He, Manchao Wang, Jiong Guo, Shan Wang, Chao Hong, Chenjie Chen, Kai Yang, Rongzhou Zhang, Xuepeng Yang, Jianwei School of Mines China University of Mining and Technology Xuzhou 221116 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Geomechanics & Deep Underground Engineering China University of Mining and Technology Beijing 100083 China College of Environmental Science and Engineering Ocean University of China Qingdao 266100 China School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan 232001 China State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China China Coal Technology & Engineering Group Coal Mining Research Institute Beijing 100013 China

Aiming at mitigating the high risks associated with conventional explosive blasting, this study developed a safe directional fracturing technique, i.e. instantaneous expansion with a single fracture (IESF), using a coal-based solid waste expanding agent. First, the mechanism of directional fracturing blasting by the IESF was analyzed, and the criterion of directional crack initiation was established. On this basis, laboratory experiments and numerical simulations were conducted to systematically evaluate the directional fracturing blasting performance of the IESF. The results indicate that the IESF presents an excellent directional fracturing effect, with average surface undulation differences ranging from 8.1 mm to 22.7 mm on the fracture surfaces. Moreover, during concrete fracturing tests, the stresses and strains in the fracturing direction are measured to be 2.16–3.71 times and 8 times larger than those in the non-fracturing direction, respectively. Finally, the IESF technique was implemented for no-pillar mining with gob-side entry retaining through roof cutting and pressure relief in an underground coal mine. The IESF technique effectively created directional cracks in the roof without causing severe roadway deformation, achieving an average cutting rate and maximum roadway deformation of 94% and 197 mm, respectively. These on-site test results verified its excellent directional rock fracturing performance. The IESF technique, which is safe, efficient, and green, has considerable application prospects in the field of rock mechanics and engineering. © 2025 Institute of Rock and Soil Mechanics, Chinese Academy of sciences

关键词： Coal-based solid waste expanding agent Crack initiation Directional fracturing blasting Non-explosive Stress-strain-damage evolution

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Design and implementation of fire alarm module for smart home

Design and implementation of fire alarm module for smart hom...

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2023 International Conference on Electronic Information Engineering and Data Processing, EIEDP 2023

作者： Liu, Xiaohong Yan, Kai College of Big Data and Intelligent Engineering Southwest Forestry University Kunming650224 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China

ISBN: (纸本)9781510666160

With the continuous development of information technology, artificial intelligence fire automatic alarm system is gradually developed. However, the current system is based on a single sensor for identification, when a fire still uses manual active fire extinguishing, low efficiency in handling fire, high failure rate, poor system scalability, poor anti-interference ability, high false alarm rate. At the same time, the recognition accuracy is low, the processing speed and intelligence are also insufficient. Therefore. To address the above problems, this study designs a multi-sensor artificial intelligence fire prevention system using smoke and temperature sensors. The fire prevention system can send alarm signals at the earliest stage of fire and can intelligently extinguish the fire, so that the disaster can be controlled and extinguished by taking measures in advance. Meanwhile, the system can continue to work even if one of the sensors is not working properly. © 2023 SPIE.

关键词： Fires

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Two-Archive-Based Competitive Swarm Optimizer for Constrained Multiobjective Optimization 5

Two-Archive-Based Competitive Swarm Optimizer for Constraine...

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5th International Conference on Data-Driven Optimization of Complex Systems, DOCS 2023

作者： Li, Lianghao He, Cheng Lin, Jianqing Pan, Linqiang School of Artificial Intelligence and Automation Huazhong University of Science and Technology Key Laboratory of Image Information Processing and Intelligent Control of Education Ministry of China Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350393521

Constrained multiobjective optimization problems (CMOPs) are prevalent in various real-world applications, presenting a formidable challenge to existing evolutionary algorithms when faced with intricate constraints. When solving CMOPs, a crucial concern is achieving a balance between convergence, diversity, and feasibility. To address these challenges, this paper proposes a two-archive-based constrained multiobjective competitive swarm optimizer. The algorithm preserves two collaborative and complementary archives to improve population convergence and feasibility. By implementing a competitive particle swarm mechanism, offspring solutions are generated by drawing upon solutions from both archives, thus capitalizing on their synergistic effect and exceptional information. An adaptive parameter is also used to adjust the bias in choosing the winner in the paired competition during the evolution. The experimental results demonstrate the effectiveness of the proposed algorithm in handling constrained multiobjective optimization problems. © 2023 IEEE.

关键词： Constraint handling

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Multi-Blockchain Based Data Trading Markets With Novel Pricing Mechanisms

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2222-2232页

作者： Juanjuan Li Junqing Li Xiao Wang Rui Qin Yong Yuan Fei-Yue Wang IEEE the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China the College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590China the School of Artificial Intelligence Anhui UniversityHefei 266114 the Qingdao Academy of Intelligent Industries Qingdao 230031China the School of Mathematics Renmin University of ChinaBeijing 100872China the State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 the Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China

In the era of big data,there is an urgent need to establish data trading markets for effectively releasing the tremendous value of the drastically explosive *** security and data pricing,however,are still widely regarded as major challenges in this respect,which motivate this research on the novel multi-blockchain based framework for data trading markets and their associated pricing *** this context,data recording and trading are conducted separately within two separate blockchains:the data blockchain(DChain) and the value blockchain(VChain).This enables the establishment of two-layer data trading markets to manage initial data trading in the primary market and subsequent data resales in the secondary ***,pricing mechanisms are then proposed to protect these markets against strategic trading behaviors and balance the payoffs of both suppliers and ***,in regular data trading on VChain-S2D,two auction models are employed according to the demand scale,for dealing with users’ strategic *** incentive-compatible Vickrey-Clarke-Groves(VCG)model is deployed to the low-demand trading scenario,while the nearly incentive-compatible monopolistic price(MP) model is utilized for the high-demand trading *** temporary data trading on VChain-D2S,a reverse auction mechanism namely two-stage obscure selection(TSOS) is designed to regulate both suppliers’ quoting and users’ valuation ***,experiments are carried out to demonstrate the strength of this research in enhancing data security and trading efficiency.

关键词： Auction data trading markets multi-blockchain pricing mechanisms

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Outage Analysis of RSMA Enabled Integrated Satellite-Terrestrial Networks

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IEEE Transactions on Vehicular technology 2025年第6期74卷 10023-10028页

作者： Hu, Chenbo Yang, Hongjuan Zhou, Zhiquan Li, Bo Jiang, Xu Zhao, Nan Nallanathan, Arumugam Weihai264209 China Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of Technology Dalian116024 China School of Electronic Engineering and Computer Science Queen Mary University of London London United Kingdom Department of Electronic Engineering Kyung Hee University Yongin-si Gyeonggi-do 17104 China

Rate splitting multiple access (RSMA) has emerged in the integrated satellite-terrestrial networks (ISTNs). However, the satellite-terrestrial channel suffers serious shadow fading and cannot maintain stable communication links effectively. From the perspective of reliability, this correspondence takes the lead in focusing on the outage probability (OP) of ISTNs based on the combination of RSMA and hybrid automatic repeat request with chase combining (HARQ-CC). The lower and upper bounds of OP are derived firstly according to the inclusion-exclusion principle. Then, the diversity order is deduced, pointing out the conditions for full time diversity. Monte Carlo simulations confirm the accuracy of the theoretical results, and superior outage performance of HARQ-CC-aided RSMA is present compared with benchmarks. © 1967-2012 IEEE All rights reserved.

关键词： Satellite links

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Path Planning Method of Unmanned Surface Vessel Based on Strategy Integration 23rd

Path Planning Method of Unmanned Surface Vessel Based on Str...

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23rd IFToMM China International Conference on Mechanism and Machine science and Engineering, IFToMM CCMMS 2022

作者： Yang, Caipei Zhao, Yingqi Liu, Jie Zhou, Kaibo MOE Key Laboratory of Image Information Processing and Intelligent Control School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan430074 China School of Civil and Hydraulic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789811993978

In the task of path planning, the unmanned surface vessels (USV) are required to reach the destination while avoiding obstacle. However, it is difficult for USV to prioritize the two sub-target tasks of destination arrival and obstacle avoidance in a complex dynamic environment using traditional path planning methods. Based on the above considerations, a path planning method for USVs based on strategy integration is proposed. Firstly, the path planning scenario containing dynamic obstacles and two sub-target scenarios are set up. In order to strengthen its ability to reach the destination and avoid dynamic obstacles, the dynamic obstacles and the destination are removed separately in the two sub-target scenarios. Furthermore, the model for strategy selection is trained on action decisions in sub-target scenarios through double deep Q-Network with prioritized experience replay. Finally, a framework for strategy integration is designed to optimize strategy selection for USV. The simulation results show that the proposed method achieves a good overall performance and a higher path planning success rate than the traditional path planning method. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Motion planning

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Line of the Sight Cone Artificial Repulsion Force Method for Autonomous Obstacle Avoidance in space under the Model Predictive and Inversive control Guidance

Line of the Sight Cone Artificial Repulsion Force Method for...

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2021 China Automation Congress, CAC 2021

作者： Tan, Tian-Le Zhang, Yu-Ke Shanghai Aerospace Control Technology Insititute Shanghai Key Laboratory of Space Intelligent Control Technology Shanghai China

ISBN: (纸本)9781665426473

Aiming at the obstacle avoidance problem in the process of the space rendezvous, docking and relative guidance, analysis and compare with the main methods and ways of the autonomous path planning and the obstacle avoidance in motion. Based on the image profile of the obstacle under the spacecraft relative navigation field of view, building dynamically the space obstacle line of sight cone model in real time;Under the condition of the spacecraft's velocity vector point to the inside of the line of the sight cone, we design an artificial exclusion potential field which is perpendicular to the velocity vector and push the velocity vector away from the line of the sight cone. Combined with the model predictive and inversive control guidance, we propose a method which is combined with the model predictive and inversive control guidance and the line of the sight cone artificial repulsion field. The simulation result indicates that the method we proposed can avoid the traditional artificial repulsion field method 's problem, which include the crossing obstacle space, bounces and oscillates around the obstacle space and fly around the distance. This method can better avoid the spacecraft fall into a local stabilization point, effective implementation autonomous avoidance of the space obstacles. © 2021 IEEE

关键词： space rendezvous

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Numerical simulation and experiment of a blade management device in microgravity 17

Numerical simulation and experiment of a blade management de...

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17th Asian International Conference on Fluid Machinery, AICFM 2023

作者： Chen, L. Li, Y. Liu, J.T. He, X.M. Qu, Z. Yang, N.J. Department of Energy Science and Engineering Harbin Institute of Technology Harbin150001 China Department of Space Propulsion Beijing Institute of Control Engineering Beijing100094 China Department of Operation and Development Beijing Aerospace Shenzhou Intelligent Equipment Technology Co. LTD Beijing100000 China

Currently, most satellite propulsion systems are mainly chemical propulsion, and liquid propellant is the necessary power fuel for the propulsion system. The working environment of microgravity occurs when the satellite is in orbit. According to the working characteristics of the satellite, a propellant management device of vane type is designed. The PMD is composed of a vertical guide plate and a liquid accumulator, which is applied to the propellant tank to store and manage the propellant. In this paper, the microgravity gas-liquid management and control mechanism of a propellant management device of vane type is studied by numerical simulation and tower drop test. The results of numerical simulation and tower drop test are consistent, which verifies the good fluid management characteristics of this type of propellant management device, and provides references for its engineering application and the design of this type of structure. © Published under licence by IOP Publishing Ltd.

关键词： Microgravity

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Energy Management Strategies for PEMFC-Lithium Battery Hybrid Power Systems Based on Pt Degradation 42

Energy Management Strategies for PEMFC-Lithium Battery Hybri...

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42nd Chinese control Conference, CCC 2023

作者： Guo, Ziang Li, Beijia Zeng, Linghong Fu, Jun Sheng, Chuang Li, Xi Huazhong University of Science and Technology School of Artificial Intelligence and Automation Key Laboratory of Image Processing and Intelligent Control of Education Ministry Hubei Wuhan430074 China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen518055 China

ISBN: (纸本)9789887581543

Proton Exchange Membrane Fuel Cells(PEMFCs) are prone to decreased lifespan due to the degradation of the plat-inum(Pt) catalyst during operation. In this study, we have established a one-dimensional model to investigate the effects of different voltage conditions on Pt degradation. High potential is found to be the most significant factor affecting the degradation. Prolonged exposure to high potentials will significantly reduce the PEMFC's lifespan, and frequent voltage changes will exac-erbate the problem. To mitigate this issue, we have designed three energy management strategies with different limitations and simulated their performance in the operating scenario of a fuel-cell hybrid electric vehicle(FCHEV). The results demonstrate that strategies restricting high potential occurrences and voltage variations can effectively alleviate Pt degradation. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Online Identification of Frequency Response of Attitude control System based on Eigensystem Realization Algorithm 22

Online Identification of Frequency Response of Attitude Cont...

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2nd International Conference on control and intelligent Robotics, ICCIR 2022

作者： Peng, Yue Liu, Jiarun Science and Technology on Aerospace Intelligent Control Laboratory Beijing Aerospace Automatic Control Institute Beijing China China Academy of Launch Vehicle Technology Beijing Aerospace Automatic Control Institute Beijing China

ISBN: (纸本)9781450397179

In view of the problems that the existing attitude control system identification algorithms often rely on actively applying the excitation signal in the loop, which may lead to actuator damage, control quality degradation and long identification time, this paper studies an identification algorithm without actively applying the excitation signal - Eigensystem Realization Algorithm (ERA).The algorithm can be carried out under closed-loop conditions without affecting the stability and safety of flight *** on a simple state-space model, this paper analyzes the difference of the identification effect of the algorithm under different parameter settings, and applies the algorithm to the frequency response identification of the attitude control system of a vertical take-off and landing (VTOL) verification *** simulation results show that the identification results of the new algorithm have a certain reference value for the verification and evaluation of control system design results, and provide a new idea for the field of online identification of aircraft dynamic characteristics. © 2022 ACM.

关键词： Frequency response

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