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MATHEMATICAL MODEL OF SELF-REPAIRING FLIGHT CONTROL 被引量:2
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作者 王永 詹训慧 +1 位作者 吴刚 胡寿松 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2003年第2期178-183,共6页
The most prospective method for certain structural failures and damages that cannot employ redundancy is self-repairing techniques, to ensure especially the maximum flight safety. Based on the characters of self-repai... The most prospective method for certain structural failures and damages that cannot employ redundancy is self-repairing techniques, to ensure especially the maximum flight safety. Based on the characters of self-repairing aircraft, this paper states some basic assumptions of the self-repairing aircraft, and puts forward some special new conceptions concerning the self-repairing aircraft: control input, operating input, command input, repair input and operating and control factor as well as their relationships. Thus it provides a simple and reliable mathematical model structure for the research on the self-repairing control of the aircraft. 展开更多
关键词 self-repairing flight control mathematical model operating and control factor
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DIRECT SELF-REPAIRING CONTROL FOR HELICOPTER VIA QUANTUM CONTROL AND ADAPTIVE COMPENSATOR 被引量:1
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作者 陈复扬 姜斌 陶钢 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2011年第4期337-342,共6页
A direct self-repairing control approach is proposed for helicopter via quantum control techniques and adaptive compensator when some complex faults occur. For a linear varying-parameter helicopter control system, the... A direct self-repairing control approach is proposed for helicopter via quantum control techniques and adaptive compensator when some complex faults occur. For a linear varying-parameter helicopter control system, the model reference adaptive control law is designed and an adaptive compensator is used for improving its self-re- pairing capability. To enhance anti-interference capability of helicopter, quantum control feedforward is added be- tween fault and disturbance. Simulation results illustrate the effectiveness and feasibility of the approach. 展开更多
关键词 HELICOPTER model reference adaptive control self-repairing control quantum control
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Tribological characteristics and self-repairing effect of hydroxy-magnesium silicate on various surface roughness friction pairs 被引量:6
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作者 张博 徐滨士 +1 位作者 许一 张保森 《Journal of Central South University》 SCIE EI CAS 2011年第5期1326-1333,共8页
Tribological characteristics and self-repairing effect of hydroxy-magnesium silicate (HMS) dispersed in lubricant oil on steel-to-steel friction pairs with various surface roughness were analyzed.The friction-reductio... Tribological characteristics and self-repairing effect of hydroxy-magnesium silicate (HMS) dispersed in lubricant oil on steel-to-steel friction pairs with various surface roughness were analyzed.The friction-reduction,anti-wear and self-repairing performance of various surface roughness friction pairs were examined by friction testing machine.An operation comparison was made between SJ10W-40 lubricant with and without HMS.The surface morphology and elementary composition of the grinding cracks were analyzed by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).The results show that the lubrication state changes from boundary lubrication into mixed lubrication after operation in lubricant with HMS.The friction-reduction,anti-wear and self-repairing performance of the friction pairs with various surface roughness are distinctly different.There is a repairing film whose material is different from substrate material on the grinding cracks.In addition,Si,Mg,O,Al and other elements are deposited on the repairing film which contains nanocrystals of these elements.And HMS self-repairing material possesses superior performance of friction-reduction,anti-wear and self-repairing effects. 展开更多
关键词 hydroxy-magnesium silicate surface roughness FRICTION WEAR self-repairing
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Passive smart self-repairing concrete beams by using shape memory alloy wires and fibers containing adhesives 被引量:6
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作者 匡亚川 欧进萍 《Journal of Central South University of Technology》 EI 2008年第3期411-417,共7页
An innovative approach to increase structural survivability of concrete and maintain structural durability of concrete was developed in case of earthquakes and typhoons. This approach takes advantage of the superelast... An innovative approach to increase structural survivability of concrete and maintain structural durability of concrete was developed in case of earthquakes and typhoons. This approach takes advantage of the superelastic effect of shape memory alloy(SMA) and the cohering characteristic of repairing adhesive. These SMA wires and brittle fibers containing adhesives were embedded into concrete beams during concrete casting to form smart reinforced concrete beams. The self-repairing capacity of smart concrete beams was investigated by three-point bending tests. The experimental results show that SMA wires add self-restoration capacity,the concrete beams recover almost completely after incurring an extremely large deflection and the cracks are closed almost completely by the recovery forces of SMA wires. The number or areas of SMA wires has no influence on the tendency of deformation during loading and the tendency of reversion by the superelasticity. The adhesives released from the broken-open fibers fill voids and cracks. The repaired damage enables continued function and prevents further degradation. 展开更多
关键词 self-repairing concrete shape memory alloy SUPERELASTICITY repairing fiber repairing adhesive
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Self-repairing functionality and corrosion resistance of in-situ Mg-Al LDH film on Al-alloyed AZ31 surface 被引量:2
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作者 Yi-Xing Zhu Guang-Ling Song Peng-Peng Wu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第5期1567-1579,共13页
A novel Mg-Al LDH film was in-situ prepared hydrothermally in an alkaline aqueous solution on an Al-alloyed AZ31 substrate.The structural,chemical and functional characteristics of the film were explored by means of s... A novel Mg-Al LDH film was in-situ prepared hydrothermally in an alkaline aqueous solution on an Al-alloyed AZ31 substrate.The structural,chemical and functional characteristics of the film were explored by means of scanning electron microscope(SEM),X-ray diffraction(XRD),energy dispersive spectrometer(EDS),polarization curve,AC impedance and salt immersion tests,respectively.The anti-corrosion results indicated that the Mg-Al LDH film on the Al-alloyed AZ31 surface could effectively protect the AZ31 from corrosion attack even after 90 days of immersion in 3.5 wt.%NaCl solution.The protection performance is surprisingly better than most of the reported coatings on Mg alloys.More interestingly,when the Mg-Al LDH film was scratched,the exposed Al-alloyed surface might gradually release metal ions and re-generate dense LDH nano-sheets in the corrosive environment to inhibit the further corrosion there,exhibiting a self-repairing behavior.The combination of the benign long-term protection and desirable self-repairing performance in this new process of surface-alloying and LDH-formation may significantly extend the practical application of magnesium alloys. 展开更多
关键词 LDH film Surface alloying Corrosion resistance self-repairing
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Self-Repairing Membranes for Inflatable Structures Inspired by a Rapid Wound Sealing Process of Climbing Plants 被引量:2
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作者 Markus Rampf Olga Speck +1 位作者 Thomas Speck Rolf H. Luchsinger 《Journal of Bionic Engineering》 SCIE EI CSCD 2011年第3期242-250,共9页
A new self-repairing membrane for inflatable light weight structures such as rubber boats or Tensairity constructions is presented. Inspired by rapid self-sealing processes in plants, a thin soft cellular polyurethane... A new self-repairing membrane for inflatable light weight structures such as rubber boats or Tensairity constructions is presented. Inspired by rapid self-sealing processes in plants, a thin soft cellular polyurethane foam coating is applied on the inside of a fabric substrate, which closes the fissure if the membrane is punctured with a spike. Experimental tests are carried out with a purpose built setup by measuring the air mass flow through a leak in a damaged membrane sample. It is shown that the weight per unit area of the self-repairing foam as well as the curing of the two component PU-foam under an overpressure influence the repair efficiency. Curing the foam under overpressure affects the relative density as well as the microstructure of the foam coatings. Maximal median repair efficiencies of 0.999 have been obtained with 0.16 g.cm 2 foam cured at 1 bar overpressure. These results suggest that the bio-inspired technique has the potential to extend the functional integrity of injured inflatable structures dramatically. 展开更多
关键词 self-repair SELF-HEALING biomimetics inflatable structures puncture resistance PU foam coating
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New robust fault-tolerant controller for self-repairing flight control systems 被引量:2
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作者 Zhang Ren Wei Wang Zhen Shen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第1期77-82,共6页
A new robust fault-tolerant controller scheme integrating a main controller and a compensator for the self-repairing flight control system is discussed.The main controller is designed for high performance of the origi... A new robust fault-tolerant controller scheme integrating a main controller and a compensator for the self-repairing flight control system is discussed.The main controller is designed for high performance of the original faultless system.The compensating controller can be seen as a standalone loop added to the system to compensate the effects of fault guaranteeing the stability of the system.A design method is proposed using nonlinear dynamic inverse control as the main controller and nonlinear extended state observer-based compensator.The stability of the whole closed-loop system is analyzed.Feasibility and validity of the new controller is demonstrated with an aircraft simulation example. 展开更多
关键词 robust control self-repairing flight control nonlinear dynamic control extended state observer compensator.
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Friction-reducing,Anti-wear and Self-repairing Properties of Sulfonated Graphene 被引量:2
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作者 付秀丽 WANG Yong +1 位作者 PAN Yongzhi WANG Xiangyu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期272-277,共6页
The friction reducing properties of sulfonated graphene as a lubricating additive were investigated using a four-ball machine tester with high carbon chromium bearing steels GCr15(SAE52100) friction pairs. The micro... The friction reducing properties of sulfonated graphene as a lubricating additive were investigated using a four-ball machine tester with high carbon chromium bearing steels GCr15(SAE52100) friction pairs. The microscopic morphology, elemental composition, and self-repairing properties were observed and analyzed by using scanning electronic microscopy(SEM), X-ray diffraction(XRD) and digital microscopy. The relationships among sulfonated graphene ethanol solution concentration, friction coefficient, and abrasion loss were revealed. It was found that the optimal concentration of ethanol solution with the addition of sulfonated graphene was 0.15g/m L and the coefficient of friction was only 0.105 under certain condition. Then the stable chemical properties and good anti-corrosion properties of the metal-graphene layer were further confirmed using salt spray corrosion test. In summary, sulfonated graphene can be used as a new kind of self repairing additive, and it has excellent wear-resistant and self-repairing performances. 展开更多
关键词 sulfonated graphene anti-wear self-repairing GCr15
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Recent progress in self-repairing coatings for corrosion protection on magnesium alloys and perspective of porous solids as novel carrier and barrier
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作者 Yajie Yang Yufei Wang +5 位作者 Mei-Xuan Li Tianshuai Wang Dawei Wang Cheng Wang Min Zha Hui-Yuan Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第10期3585-3608,共24页
Featuring low density and high specific strength, magnesium(Mg) alloys have attracted wide interests in the fields of portable devices and automotive industry. However, the active chemical and electrochemical properti... Featuring low density and high specific strength, magnesium(Mg) alloys have attracted wide interests in the fields of portable devices and automotive industry. However, the active chemical and electrochemical properties make them susceptible to corrosion in humid, seawater, soil,and chemical medium. Various strategies have revealed certain merits of protecting Mg alloys. Therein, engineering self-repairing coatings is considered as an effective strategy, because they can enable the timely repair for damaged areas, which brings about long-term protection for Mg alloys. In this review, self-repairing coatings on Mg alloys are summarized from two aspects, namely shape restoring coatings and function restoring coatings. Shape restoring coatings benefit for swelling, shrinking, or reassociating reversible chemical bonds to return to the original state and morphology when coatings broken;function self-repairing coatings depend on the release of inhibitors to generate new passive layers on the damaged areas. With the advancement of coating research and to fulfill the demanding requirements of applications, it is an inevitable trend to develop coatings that can integrate multiple functions(such as stimulus response, self-repairing, corrosion warning,and so on). As a novel carrier and barrier, porous solids, especially covalent organic frameworks(COFs), have been respected as the future development of self-repairing coatings on Mg alloys, due to their unique, diverse structures and adjustable functions. 展开更多
关键词 Mg alloys COATINGS self-repairing Corrosion protection Porous solids
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On the Survivability of Self-repairing Control System for a Hybrid Underwater Vehicle
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作者 Biao Wang Chao Wu Tong Ge 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2014年第1期32-42,共11页
A hybrid remotely operated underwater vehicle( HROV) capable of working to the full ocean depth has been developed. In order for the vehicle to achieve a certain survivability level,a self-repairing control system( SR... A hybrid remotely operated underwater vehicle( HROV) capable of working to the full ocean depth has been developed. In order for the vehicle to achieve a certain survivability level,a self-repairing control system( SRCS) has been designed. It consists of two basic technologies,fault diagnosis and isolation( FDI) and reconfigurable control. For FDI,a model-based hierarchical fault diagnosis system is designed for the HROV. Then,control strategies which reconfigure the control system at intervals according to information from the FDI system are presented. Combining the two technologies,it can obtain the fundamental frame of SRCS for the HROV. Considering the hazardous underwater environment at the limiting depth and the hybrid operating modes,an assessment of the HROV's survivability is vitally needed before it enters operational service. This paper presents a new definition of survivability for underwater vehicles and develops a simple survivability model for the SRCS. As a result of survivability assessment for the SRCS,we are able to figure out the survivability of SRCS and make further optimization about it. The methodology developed herein is also applicable to other types of underwater vehicles. 展开更多
关键词 SURVIVABILITY self-repairing HROV full ocean depth control system
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Emerging Trends in Damage Tolerance Assessment:A Review of Smart Materials and Self-Repairable Structures
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作者 Ali Akbar Firoozi Ali Asghar Firoozi 《Structural Durability & Health Monitoring》 EI 2024年第1期1-18,共18页
The discipline of damage tolerance assessment has experienced significant advancements due to the emergence of smart materials and self-repairable structures.This review offers a comprehensive look into both tradition... The discipline of damage tolerance assessment has experienced significant advancements due to the emergence of smart materials and self-repairable structures.This review offers a comprehensive look into both traditional and innovative methodologies employed in damage tolerance assessment.After a detailed exploration of damage tolerance concepts and their historical progression,the review juxtaposes the proven techniques of damage assessment with the cutting-edge innovations brought about by smart materials and self-repairable structures.The subsequent sections delve into the synergistic integration of smart materials with self-repairable structures,marking a pivotal stride in damage tolerance by establishing an autonomous system for immediate damage identification and self-repair.This holistic approach broadens the applicability of these technologies across diverse sectors yet brings forth unique challenges demanding further innovation and research.Additionally,the review examines future prospects that combine advanced manufacturing processes with data-centric methodologies,amplifying the capabilities of these‘intelligent’structures.The review culminates by highlighting the transformative potential of this union between smart materials and self-repairable structures,promoting a sustainable and efficient engineering paradigm. 展开更多
关键词 Damage tolerance smart materials self-repairable structures structural health monitoring SYNERGY autonomous system advanced manufacturing data-driven methodologies
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Plants as concept generators for biomimetic light-weight structures with variable stiffness and self-repair mechanisms 被引量:11
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作者 Thomas Speck Tom Masselter +3 位作者 Bettina Prim Olga Speck Rolf Luchsinger Siegfried Fink 《Journal of Bionic Engineering》 SCIE EI CSCD 2004年第4期199-205,共7页
Plants possess many structural and functional properties that have a high potential to serve as concept generators for the production of biomimetic technical materials and structures. We present data on two features... Plants possess many structural and functional properties that have a high potential to serve as concept generators for the production of biomimetic technical materials and structures. We present data on two features of plants (variable stiffness due to pressure changes in cellular structures and rapid self-repair functions) that may be used as models for biomimetic projects. 展开更多
关键词 BIONICS biomimetics self-repair pneumatic structures Tensairity ARISTOLOCHIA
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BOARD-LEVEL BUILT-IN SELF-REPAIR METHOD OF RAM 被引量:1
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作者 DOU Yanjie Zhan Huiqin +1 位作者 Chen Yakun Shang Hongliang 《Journal of Electronics(China)》 2012年第1期128-131,共4页
This paper describes the method of built-in self-repairing of RAM on board, designs hardware circuit, and logic for the RAM's faults self-repairing system based on FPGA. The key technology is that it utilizes FPGA... This paper describes the method of built-in self-repairing of RAM on board, designs hardware circuit, and logic for the RAM's faults self-repairing system based on FPGA. The key technology is that it utilizes FPGA to test RAM according to some algorithm to find out failure memory units and replace the faulty units with FPGA. Then it can build a memory that has no fault concern to external controller, and realizes the logic binding between external controller and RAM. Micro Controller Unit (MCU) can operate external RAM correctly even if RAM has some fault address units. Conventional MCS-51 is used to simulate the operation of MCU operating external memory. Simulation shows FPGA can complete the faulty address units' mapping and MCU can normally read and write external RAM. This design realizes the RAM's built-in self-repairing on board. 展开更多
关键词 RAM testing Built-in self-repairing Faulty address mapping Function test
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Elimination-Evolution Self-repair Method for Bio-inspired Electronic System
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作者 朱赛 蔡金燕 +1 位作者 孟亚峰 李丹阳 《Journal of Donghua University(English Edition)》 EI CAS 2016年第2期261-265,共5页
The existing self-repair methods,evolvable hardware and embryonic electronics( embryonics) are analyzed. Based on the advantages and disadvantages of the existing self-repair methods,a novel self-repair method named e... The existing self-repair methods,evolvable hardware and embryonic electronics( embryonics) are analyzed. Based on the advantages and disadvantages of the existing self-repair methods,a novel self-repair method named elimination-evolution self-repair method is proposed. The system can be repaired through elimination in real time and evolved to optimize the allocation of system resources with this method. The proposed self-repair method not only ensures the speed of the system's self-repair,but also makes full use of system resources to improve the system's self-repair capacity and provides a new self-repair approach for bio-inspired electronic system. In the end,the advantages of the proposed eliminationevolution self-repair method are verified through a simulation experiment. 展开更多
关键词 bio-inspired electronic sytem embryonics evolvable hardware self-repair elimination-evolution self-repair
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Research of 3S technology applied in land reclamation of minefield
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作者 吉长东 徐爱功 +1 位作者 于兴旺 赵立丽 《Journal of Coal Science & Engineering(China)》 2008年第4期659-662,共4页
Based on the basic theory description of 3S,and gave the example of dump of Hanzhou open-pit which belongs to Fuxin Mining Group,first of all,used the GPS tech- nology of static and RTK to get the three-dimensional po... Based on the basic theory description of 3S,and gave the example of dump of Hanzhou open-pit which belongs to Fuxin Mining Group,first of all,used the GPS tech- nology of static and RTK to get the three-dimensional position of the points in survey con- trol network and the topographic maps before and after the reclamation in reclamation area;used the technology of GPS RTK to calibrate the geometric elements designed in land reclamation,at the same time to get the actual coordinates of the design point after layout.Then,used RS technology to supervise systematically on land reclamation of min- ing area from the time to space;finally,used GIS technology to display 3-D visualization, analyze,manage,and enquire the date obtained by GPS and RS data,which can facilitate the decision decision-makers to plan land reclamation current and long-term,and can be extended to other mines which have same or similar conditions. 展开更多
关键词 minefield land reclamation 3S technology
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Influence of Working Memory Capacity on the Frequency of Self-Repairs
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作者 Lilei Gao 《Journal of Contemporary Educational Research》 2021年第8期91-95,共5页
This article explored the influence of working memory capacity on the frequency of self-repairs.The narrative task and listening span task were used.Twenty post-graduate students participated in this study.Overall,the... This article explored the influence of working memory capacity on the frequency of self-repairs.The narrative task and listening span task were used.Twenty post-graduate students participated in this study.Overall,the results of this study illustrated that the working memory is a factor of self-repairs.Speakers who have higher working memory capacity produce lesser self-repairs.This finding provides teachers with a new insight into second language teaching;that is,teachers can improve the amount of lexical knowledge when teaching students who have lower working memory in order to help them produce more accurate language during the process of L2 speech production. 展开更多
关键词 self-repair Working memory capacity
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Study onGeothermal Negative Anomaly andlts Main Controlling Factors in Sijiazhuang Minefield
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作者 YANG Changyong TIAN Qingling +3 位作者 HAO Chunsheng JI Changjiang YU Zhenfeng CHANG Huizhen 《山西焦煤科技》 2017年第8期8-16,共9页
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浅埋煤层烧变岩地球化学与变质矿物相特征
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作者 杨帆 热西提·亚力坤 +5 位作者 薛小渊 宋世骏 胡俭 张泽宇 姬中奎 黄雷 《西北大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第2期329-344,共16页
以陕北张家峁井田延安组2^(2),3^(1)段烧变岩为研究对象,对其进行岩石地球化学迁移规律以及变质矿物相特征分析。结果表明,该区烧变岩为低碱性硅铝质变质岩,横向上钙碱性分布不均一,少部分烧变样品烧失量大且CaO含量高,Fe元素迁移聚集... 以陕北张家峁井田延安组2^(2),3^(1)段烧变岩为研究对象,对其进行岩石地球化学迁移规律以及变质矿物相特征分析。结果表明,该区烧变岩为低碱性硅铝质变质岩,横向上钙碱性分布不均一,少部分烧变样品烧失量大且CaO含量高,Fe元素迁移聚集。Zr相容性比Hf更好,Ba元素富集可能与后期水文作用有关,稀土元素分配趋势线为略微轻稀土富集型,烧变作用对稀土元素的分配影响相对有限。烧变岩原生矿物多具有烧蚀特征,镜下发育烧蚀边、气孔构造等,新生矿物呈集合体充填矿物间或矿物裂缝中。矿物相组合与热接触变质作用中发生高热变质的透长岩相相近,但变质压力更低,温度更高。烧变岩层由下而上可分为薄层板状烧烤岩、烧熔岩、厚层板状烧烤岩、厚层层状烧烤岩的岩石组合,鳞石英+方石英相较莫来石+堇青石+赤铁矿能更好表征岩石烧变程度的强弱,同层烧烤岩下部烧变程度高于上部,烧熔岩上部板状烧烤岩烧变程度高于下部板状烧烤岩。研究区烧变岩具有“隐伏”的特点,且存在同沉积期烧变作用,除暴露在河谷阶地的烧变岩层外,部分烧变岩层埋于更新世地层和残余延安组地层之下。早期形成的烧变岩层后期被破坏,多期烧变地层相互叠置形成现今火烧区。 展开更多
关键词 烧变岩 张家峁井田 地球化学 变质矿物相 热接触变质作用 透长岩相
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Research progress and future prospects in the service security of key blast furnace equipment
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作者 Yanxiang Liu Kexin Jiao +3 位作者 Jianliang Zhang Cui Wang Lei Zhang Xiaoyue Fan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第10期2121-2135,共15页
The safety and longevity of key blast furnace(BF)equipment determine the stable and low-carbon production of iron.This pa-per presents an analysis of the heat transfer characteristics of these components and the uneve... The safety and longevity of key blast furnace(BF)equipment determine the stable and low-carbon production of iron.This pa-per presents an analysis of the heat transfer characteristics of these components and the uneven distribution of cooling water in parallel pipes based on hydrodynamic principles,discusses the feasible methods for the improvement of BF cooling intensity,and reviews the pre-paration process,performance,and damage characteristics of three key equipment pieces:coolers,tuyeres,and hearth refractories.Fur-thermoere,to attain better control of these critical components under high-temperature working conditions,we propose the application of optimized technologies,such as BF operation and maintenance technology,self-repair technology,and full-lifecycle management techno-logy.Finally,we propose further researches on safety assessments and predictions for key BF equipment under new operating conditions. 展开更多
关键词 blast furnace EQUIPMENT service security blast furnace campaign self-repair
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正明井田煤层气井排采效果分析
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作者 田庆玲 《能源与节能》 2024年第1期28-31,共4页
左权县正明井田为高瓦斯矿井,严重制约着煤矿的安全高效开采。通过分析正明井田煤层气地质条件,对比已投运的28口煤层气地面预抽井4种排采方式的生产效果,得出以下结论:正明井田7-10^(#)煤层适合合层排采;15^(#)煤层适合单层排采,而15^... 左权县正明井田为高瓦斯矿井,严重制约着煤矿的安全高效开采。通过分析正明井田煤层气地质条件,对比已投运的28口煤层气地面预抽井4种排采方式的生产效果,得出以下结论:正明井田7-10^(#)煤层适合合层排采;15^(#)煤层适合单层排采,而15^(#)煤层直接顶板为砂岩,煤层气赋存能力差,形成逸散,使得15^(#)煤层排采效果不及7-10^(#)煤层;本井田灰岩不适于参与煤层的合层排采。 展开更多
关键词 正明井田 煤层气 单层排采 合层排采
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