|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Adaptive Sliding Mode Control for Re-entry Attitude of Near Space Hypersonic Vehicle Based on Backstepping Design显示文摘Combining sliding mode control method with radial basis function neural network(RBFNN), this paper proposes a robust adaptive control scheme based on backstepping design for re-entry attitude tracking control of near space hypersonic vehicle(NSHV) in the presence of parameter variations and external disturbances. In the attitude angle loop, a robust adaptive virtual control law is designed by using the adaptive method to estimate the unknown upper bound of the compound uncertainties. In the angular velocity loop, an adaptive sliding mode control law is designed to suppress the effect of parameter variations and external disturbances. The main benefit of the sliding mode control is robustness to parameter variations and external disturbances. To further improve the control performance, RBFNNs are introduced to approximate the compound uncertainties in the attitude angle loop and angular velocity loop, respectively. Based on Lyapunov stability theory, the tracking errors are shown to be asymptotically stable. Simulation results show that the proposed control system attains a satisfied control performance and is robust against parameter variations and external disturbances. | Jingmei Zhang Changyin Sun Ruimin Zhang Chengshan Qian | 2015 | IEEE/CAA Journal of Automatica Sinica2015，2，1： | 30 |
| 2 | Non-fragile switching tracking control for a flexible air-breathing hypersonic vehicle based on polytopic LPV model显示文摘This article proposes a linear parameter varying (LPV) switching tracking control scheme for a flexible air-breathing hypersonic vehicle (FAHV). First, a polytopic LPV model is constructed to represent the complex nonlinear longitudinal model of the FAHV by using Jacobian linearization and tensor-product (T-P) model transformation approach. Second, for less conservative controller design purpose, the flight envelope is divided into four sub-regions and a non-fragile LPV controller is designed for each parameter sub-region. These non-fragile LPV controllers are then switched in order to guarantee the closed-loop FAHV system to be asymptotically stable and satisfy a specified performance criterion. The desired non-fragile LPV switching controller is found by solving a convex constraint problem which can be efficiently solved using available linear matrix inequality (LMI) techniques, and robust stability analysis of the closed-loop FAHV system is verified based on multiple Lypapunov functions (MLFs). Finally, numerical simulations have demonstrated the effectiveness of the proposed approach. | Huang Yiqing Sun Changyin Qian Chengshan Wang Li | 2013 | Chinese Journal of Aeronautics2013，26，4： | 19 |
| 3 | On modeling and control of a flexible air-breathing hypersonic vehicle based on LPV method显示文摘这篇文章开发 polytopic 变化的线性参数(LPV ) 模型和礼品为灵活呼吸空气的极超音速的车辆(FAHV ) 的非易碎的 H 2 安排获得的控制。首先, FAHV 的 polytopic LPV 模型能被使用 Jacobian linearization 和张肌产品(TP ) 模型转变途径获得,模拟确认说明 polytopic LPV 模型捕获原来的非线性的系统的本地非线性。基于发达 polytopic LPV 模型,第二,一个非易碎的 gainscheduled 控制方法被建议以便减少在控制器实现遇到的脆弱,有线性矩阵不平等( LMI )的一个凸的优化问题限制为设计速度和高度追踪控制器被提出,它保证 H 2 控制性能索引。最后,数字模拟表明了建议途径的有效性。 | Changyin SUN Yiqing HUANG Chengshan QIAN Li WANG | 2012 | Frontiers of Electrical and Electronic Engineering in China2012，7，1： | 12 |
| 4 | Polytopic LPV modeling and gain-scheduled switching control for a flexible air-breathing hypersonic vehicle显示文摘A novel gain-scheduled switching control method for the longitudinal motion of a flexible air-breathing hypersonic vehicle (FAHV) is proposed.Firstly,velocity and altitude are selected as scheduling variables,a polytopic linear parameter varying(LPV) model is developed to represent the complex nonlinear longitudinal dynamics of the FAHV.Secondly,based on the obtained polytopic LPV model,the flight envelope is divided into four smaller subregions, and four gain-scheduled controllers are designed for these parameter subregions.Then,by the defined switching characteristic function,these gain-scheduled controllers are switched in order to guarantee the closed-loop FAHV system to be asymptotically stable and satisfy a given tracking error performance criterion.The condition of gain-scheduled switching controller synthesis is given in terms of linear matrix inequalities(LMIs) which can be easily solved by using standard software packages.Finally,simulation results show the effectiveness of the presented method. | Yiqing Huang Changyin Sun Chengshan Qian Jingmei Zhang Li Wang | 2013 | Journal of Systems Engineering and Electronics2013，24，1： | 10 |
| 5 | Hepatic encephalopathy complicated with hyponatremia and acid-base disturbance and its prognosis显示文摘Objective:To improve the diagnosis and therapeutic effect of occurrence and development of hyponatremia and disorder of acid-base balance among patients with hepatic encephalopathy(HE) by elucidating the regularity and mechanism,as well as its influence on prognosis.Methods:327 HE patients admitted to our hospital from January 1990 to June 2010 were enrolled.Meanwhile 316 patients hospitalized in the medical department of the same hospital were chosen as the control group.Patients in both groups were given the same methods to measure arterial blood gas parameters(pH value,PaCO2,[HCO3-],TCO2,BE and SaO2),blood biochemistry([Na+],[K+],[Cl-]),liver function,kidney function and blood glucose,serum sodium,and thereupon tocalculate the anion gap(AG) and the potential [HCO3-],and acid-base balance disorder.Results:Among the 327 HE patients,hyponatremia was found in 188 cases(57.4%),of whom 132 patients died(70.2%).While among the 316 patients in control group,68 presented with hyponatremia(21.5%),and 19 died(27.9%).The incidence and mortality were significantly different between the two groups(P<0.001).All the 327 patients presented with different degrees of acid-base balance disorder and 178 died(54.4%),in whom 164(50.2%) belonged to simple acid-base balance disorder and 74(45.1%) died,136(41.6%) were dual acid-base balance disorder and 80(58.8%) died,27(8.2%) were triple acid-base disturbance and 24(88.9%) died.Whereas in the control group only 83 patients(26.2%) were recognized as simple and dual acid-base balance disorder,and 18(21.7%) died.There was higher incidence of acid-base balance disorder and mortality rate in HE group than control one(P<0.001).Conclusion:Hyponatremia is valuable to judge HE patients' prognosis.The key parameters in the judgment and evaluation on acid-base balance disorder among HE patients are the change of pH values and serum electrolyte values.When pH value ≤ 7.30 or > 7.55,it generally suggests a poor prognosis. | Ren Chengshan Wang Lei Zhao Xiaoyan Yang Shiming Zhang Yanqi Wang Xiwen Bo Jianying Zhang Pengbin Guo Hong Ling Xianlong Li Yihui Da Siping Xie Xia Ren Wei Li Chunhua Qian Guisheng | 2012 | Journal of Medical Colleges of PLA(China)2012，27，3： | 3 |
| 6 | Non-fragile switching tracking control for a flexible air-breathing hypersonic vehicle based on polytopic LPV model显示文摘 | Yiqing Huang Changyin Sun Chengshan Qian Li Wang | 2012 | Chinese Journal of Aeronautics2012，，： | 1 |
| 7 | Creation of cylindrical vector beams through highly anisotropic scattering media with a single scalar transmission matrix calibration显示文摘Cylindrical vector(CV)beams have attracted increasing interest due to their particular properties and their applications in optical imaging,optical manipulation,and light-matter interactions.However,it is challenging to construct CV beams through highly anisotropic scattering media(HASM),such as thick biological tissue,posing a barrier to the applications of CV beams that involve HASM.Here,we present a scheme to construct CV beams beyond high scattering that only requires a single scalar transmission matrix(TM)calibration and manipulation of the spatial degrees of freedom of the scalar input field.Assisted by a radial polarization converter(S-waveplate)and a polarizer,the scheme enables one to obtain the correct incident wavefront for the creation of CV beams through HASM with only one single scalar TM calibration.Compared to the existing method,this user-friendly approach is fast and simple in terms of the optical implements and computations.Both radially and azimuthally polarized beams are experimentally constructed through a Zn O scattering layer to demonstrate the viability of the method.Arbitrarily generalized CV beams and arrays of CV beams are also created through the HASM to further prove the flexibility of the method.We believe this work may pave the way for applications of CV beams that involve a highly anisotropic scattering environment. | QIAN ZHAO SHIJIE TU QIANNAN LEI CHENGSHAN GUO QIWEN ZHAN YANGJIAN CAI | 2022 | Photonics Research2022，10，7： | 1 |
| 8 | Sedimentology,provenance and geochronology of the Miocene Qiuwu Formation:Implication for the uplift history of Southern Tibet显示文摘Located on the south of the Gangdese,the Qiuwu Formation has traditionally been considered as Eocene coal-bearing clastic sediments consisting of sandstone,mudstone and conglomerate,unconformably on top of Gangdese batholith.However,its precise age and depositional environment remain ambiguous.Here,we present a newly measured stratigraphic section near the Ngamring County,western Xigaze.Detrital zircon U-Pb ages were also applied to trace the provenance of sediments and to constrain the maximum depositional age of the Qiuwu Formation.Sedimentary facies analyses indicate subaqueous fan and alluvial fan depositional environments.Clast composition of the conglomerate is dominated by magmatic rocks at the lower part,while chert and mafic detritus occur in the upper part,suggesting a southern source.Sandstone modal analyses indicate that the compositions of quartz,feldspar and lithic grains changed from transitional arc to dissected arc,implying the unroofing of the Gangdese arc.Detrital zircon U-Pb ages of the Qiuwu Formation are compared with those from Gangdese magmatic rocks and Yarlung-Zangbo ophiolites,suggesting that the Gangdese arc is a main source of the Qiuwu detritus and that the southern source played a role during the later stage.The major peak of detrital zircon ages is at 45-55 Ma,which corresponds to Linzizong volcanic rocks in southern Gangdese arc.The weighted mean age of the five youngest zircons from the lower part of the section is 21.0 ± 2.2 Ma,suggesting that the Qiuwu Formation was deposited in early Miocene,coeval with other conglomerates exposed along the southern margin of Gangdese.Combining new observations with previously published data,we propose that the provenance of the Qiuwu Formation had shifted from a single northern source to double sources from both the north and the south.Activities of Great Counter Thrust were primarily responsible for the shift by making the south area a high elevation to provide sediments for the Qiuwu Formation. | Jiawei Zhang Jingen Dai Xinyu Qian Yukui Ge Chengshan Wang | 2017 | Geoscience Frontiers2017，8，4： | 0 |
| 9 | Code-Based Preservation Mechanism of Electronic Record in Electronic Record Center of Cloud Storage显示文摘With the rapid development of E-commerce and E-government,there are so many electronic records have been produced.The increasing number of electronic records brings about storage difficulties,the traditional electronic records center is difficult to cope with the current fast growth requirements of electronic records storage and management.Therefore,it is imperative to use cloud storage technology to build electronic record centers.However,electronic records also have weaknesses in the cloud storage environment,and one of them is that once electronic record owners or managers lose physical control of them,the electronic records are more likely to be tampered with and destroyed.So,the paper builds a reliable electronic records preservation system based on coding theory.It can effectively guarantee the reliability of record storage when the electronic record is damaged,and the original electronic record can be restored by redundant coding,thus ensuring the reliable storage of electronic records. | Yan Leng Yongjun Ren Chengshan Qian Jinyue Xia | 2019 | Journal on Big Data2019，1，1： | 0 |
| 10 | Data Security Defense and Algorithm for Edge Computing Based on Mean Field Game显示文摘With the development of the Internet of Things,the edge devices are increasing.Cyber security issues in edge computing have also emerged and caused great concern.We propose a defense strategy based on Mean field game to solve the security issues of edge user data during edge computing.Firstly,an individual cost function is formulated to build an edge user data security defense model.Secondly,we research the����-Nash equilibrium of the individual cost function with finite players and prove the existence of the optimal defense strategy.Finally,by analyzing the stability of edge user data loss,it proves that the proposed defense strategy is effective. | Chengshan Qian Xue Li Ning Sun Yuqing Tian | 2020 | Journal of Cyber Security2020，2，2： | 0 |
| 11 | HPDS133-bus:A Benchmark Test System for Distribution Systems with High Penetration of Distributed Generation显示文摘The benchmark test system for distribution systems is necessary and important for system analysis and result data checking.In order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is proposed.Based on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this paper.In order to adapt to the trend that the distribution systems will present the mixed state of AC and DC,a typical improvement scheme of distribution systems in urban scenario is presented.The benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of DG.Moreover,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in detail.Finally,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are given.The benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches. | Fengzhang Luo Chongbo Sun Xin Yang Tianyu Zhang Chengshan Wang Jun Xiao Liangzhong Yao Lingzhi Zhu Minhui Qian | 2023 | CSEE Journal of Power and Energy Systems2023，9，3： | 0 |
| 12 | Edge enhancement of phase objects through complex media by using transmission-matrixbased spiral phase contrast imaging显示文摘The wavefront shaping based technique has been introduced to detect the edges of amplitude objects through complex media,but the extraction of the boundary information of invisible phase objects through complex media has not been demonstrated yet.Here,we present a phase contrast imaging technique to overcome the scattering,aiming to achieve the edge detection of the phase object through the complex media.An operator based on the experimentally measured transmission matrix is obtained by numerically adding a spiral phase in the Fourier domain.With the inverse of the filtered transmission matrix,we can directly reconstruct the edge enhanced images for both amplitude object and phase object beyond scattering.Experimentally,both digital and real objects are imaged,and the results verify that isotropic edge detection can be achieved with our technique.Our work could benefit the detection of invisible phase objects through complex media. | Qian Zhao Shijie Tu Qiannan Lei Qingyang Yue Chengshan Guo Yangjian Cai | 2022 | Frontiers of physics2022，17，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员