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| 1 | Attitude tracking control for variable structure near space vehicles based on switched nonlinear systems显示文摘An adaptive robust attitude tracking control law based on switched nonlinear systems is presented for a variable structure near space vehicle (VSNSV) in the presence of uncertainties and disturbances. The adaptive fuzzy systems are employed for approximating unknown functions in the flight dynamic model and their parameters are updated online. To improve the flight robust performance, robust controllers with adaptive gains are designed to compensate for the approximation errors and thus they have less design conservation. Moreover, a systematic procedure is developed for the synthesis of adaptive fuzzy dynamic surface control (DSC) approach. According to the common Lyapunov function theory, it is proved that all signals of the closed-loop system are uniformly ultimately bounded by the continuous controller. The simulation results demonstrate the effectiveness and robustness of the proposed control scheme. | Wang Yufei Jiang Changsheng Wu Qingxian | 2013 | Chinese Journal of Aeronautics2013，26，1： | 21 |
| 2 | Anti-disturbance control of hypersonic flight vehicles with input saturation using disturbance observer显示文摘This paper proposes an anti-disturbance control scheme for the near space vehicle(NSV) based on terminal sliding mode(TSM) technique and disturbance observer method. To tackle the system uncertainty and the time-varying unknown external disturbance of the NSV, a disturbance observer based on TSM technique is designed which can render the disturbance estimate error convergent in finite time. Furthermore, an auxiliary design system is introduced to analyze the input saturation effect. Based on the developed disturbance observer and the auxiliary design system, an anti-disturbance attitude control scheme is developed for the NSV using the TSM technique to speed up the convergence of all signals in closed-loop system. For the closed-loop system,the stability is rigorously proved by using the Lyapunov method and we guarantee the finite time convergence of all closed-loop system signals in the presence of the integrated affection of the system uncertainty, the input saturation, and the unknown external disturbance. Simulation study results are given to show the effectiveness of the developed TSM anti-disturbance attitude control scheme using the disturbance observer and the auxiliary system for the NSV. | CHEN Mou REN BeiBei WU QinXian JIANG ChangSheng | 2015 | Science China(Information Sciences)2015，58，7： | 21 |
| 3 | Guaranteed transient performance based control with input saturation for near space vehicles显示文摘This paper describes the design of guaranteed transient performance based attitude control for the near space vehicle(NSV)with control input saturation using the backstepping method.To improve the robust controllability of the NSV,the parameter adaptive method is used to tackle the integrated effect of unknown time-varying disturbance and control input saturation.Based on the backstepping technique and parameter estimated outputs,a robust attitude control scheme is proposed for the NSV with input saturation.A novel robust attitude control scheme is then proposed based on a prescribed performance bound(PPB)which characterizes the convergence rate and maximum overshoot of the attitude tracking error.The closed-loop system stability under both the developed robust attitude control schemes is proved using Lyapunov’s method and uniformly asymptotical convergence of all closed-loop signals is guaranteed.Finally,simulation results are given to show the effectiveness of both the proposed robust constrained attitude control schemes. | CHEN Mou WU QinXian JIANG ChangSheng JIANG Bin | 2014 | Science China(Information Sciences)2014，57，5： | 19 |
| 4 | A FVCOM-Based Unstructured Grid Wave, Current,Sediment Transport Model,I.Model Description and Validation显示文摘An effort was made to couple FVCOM (a three-dimensional (3D),unstructured grid,Finite Volume Coastal Ocean Model) and FVCOM-SWAVE (an unstructured grid,finite-volume surface wave model) for the study of nearshore ocean processes such as tides,circulation,storm surge,waves,sediment transport,and morphological evolution.The coupling between FVCOM and FVCOM-SWAVE was achieved through incorporating 3D radiation stress,wave-current-sediment-related bottom boundary layer,sea surface stress parameterizations,and morphology process.FVCOM also includes a 3D sediment transport module.With accurate fitting of irregular coastlines,the model provides a unique tool to study sediment dynamics in coastal ocean,estuaries,and wetlands where local geometries are characterized by inlets,islands,and intertidal marsh zones.The model was validated by two standard benchmark tests: 1) spectral waves approaching a mild sloping beach and 2) morphological changes of seabed in an idealized tidal inlet.In Test 1,model results were compared with both analytical solutions and laboratory experiments.A further comparison was also made with the structured grid Regional Ocean Model System (ROMS),which provides an insight into the performance of the two models with the same open boundary forcing. | WU Lunyu CHEN Changsheng GUO Peifang SHI Maochong QI Jianhua GE Jianzhong | 2011 | Journal of Ocean University of China2011，10，1： | 15 |
| 5 | Robust adaptive backstepping control for a class of uncertain nonlinear systems based on disturbance observers显示文摘In this paper, a novel robust adaptive control scheme for a class of uncertain nonlinear systems is proposed using disturbance observer and backstepping method.Firstly, a disturbance observer is developed using radial basis function(RBF) neural network.The parameter updated law of the RBF neural network is given for monitoring subsystem disturbance well.The robust adaptive control scheme is then presented with backstepping method based on the designed disturbance observer.Semiglobal uniform ultimate boundedness(SGUUB) of all signals in the closed-loop uncertain nonlinear system is achieved.The closed-loop system stability analysis shows that semiglobal uniform boundedness of all signals is guaranteed by appropriately choosing design parameters.Finally, two examples are taken to illustrate the effectiveness of the proposed control scheme. | MEI Rong WU QingXian JIANG ChangSheng | 2010 | Science China(Information Sciences)2010，53，6： | 10 |
| 6 | Adaptive recurrent-functional-link-network control for hypersonic vehicles with atmospheric disturbances显示文摘The controller design for a near-space hypersonic vehicle (NHV) is challenging due to its plant uncertainties and sensitivity to atmospheric disturbances such as gusts and turbulence. This paper first derives 12 states equations of NHVs subjected to variable wind field, and presents a novel recurrent neural network (RNN) control method for restraining atmospheric disturbances. The method devises a new B-spline recurrent functional link network (BRFLN) and combines it with the nonlinear generalized predictive control (NGPC) algorithm. Moreover, the proportional-derivative (PD) correction BRFLN is proposed to approximate atmo- spheric disturbances in flight. The weights of BRFLN are online tuned by the adaptive law based on Lyapunov stability theorem. Finally, simulation results show a satisfactory performance for the attitude tracking of the NHV in the mesosphere, and also illustrate the controller's robustness to wind turbulence. | DU YanLi WU QingXian JIANG ChangSheng XUE YaLi | 2011 | Science China(Information Sciences)2011，54，3： | 8 |
| 7 | Noise-sidebands-free and ultra-low-RIN 1.5 μm single-frequency fiber laser towards coherent optical detection显示文摘A noise-sidebands-free and ultra-low relative intensity noise(RIN) 1.5 μm single-frequency fiber laser is demonstrated for the first time to our best knowledge. Utilizing a self-injection locking framework and a booster optical amplifier, the noise sidebands with relative amplitudes as high as 20 dB are completely suppressed.The RIN is remarkably reduced by more than 64 dB at the relaxation oscillation peak to retain below-150 dB∕Hz in a frequency range from 75 kHz to 50 MHz, while the quantum noise limit is -152.9 d B∕Hz.Furthermore, a laser linewidth narrower than 600 Hz, a polarization-extinction ratio of more than 23 dB, and an optical signal-to-noise ratio of more than 73 dB are acquired simultaneously. This noise-sidebands-free and ultralow-RIN single-frequency fiber laser is highly competitive in advanced coherent light detection fields including coherent Doppler wind lidar, high-speed coherent optical communication, and precise absolute distance coherent measurement. | QILAI ZHAO ZHITAO ZHANG BO WU TIANYI TAN CHANGSHENG YANG JIULIN GAN HUIHUI CHENG ZHOUMING FENG MINGYING PENG ZHONGMIN YANG SHANHUI XU | 2018 | Photonics Research2018，6，4： | 7 |
| 8 | Retrospective forecasting test of a statistical physics model for earthquakes in Sichuan-Yunnan region显示文摘Pattern informatics (PI) model is one of the recently developed predictive models of earthquake phys- ics based on the statistical mechanics of complex systems. In this paper, retrospective forecast test of the PI model was conducted for the earthquakes in Sichuan-Yunnan region since 1988, exploring the possibility to apply this model to the estimation of time-dependent seismic hazard in continental China. Regional earthquake catalogue down to ML3.0 from 1970 to 2007 was used. The ‘target magnitude’ for the forecast test was MS5.5. Fifteen-year long ‘sliding time window’ was used in the PI calculation, with ‘anomaly training time window’ being 5 years and ‘forecast time window’ being 5 years, respectively. Receiver operating characteristic (ROC) test was conducted for the evaluation of the forecast result, showing that the PI forecast outperforms not only random guess but also the simple number counting approach based on the clustering hypothesis of earthquakes (the RI forecast). If the ‘forecast time window’ was shortened to 3 years and 1 year, respectively, the forecast capability of the PI model de- creased significantly, albeit outperformed random forecast. For the one year ‘forecast time window’, the PI result was almost comparable to the RI result, indicating that clustering properties play a more important role at this time scale. | ChangSheng Jiang ZhongLiang Wu | 2008 | Science China Earth Sciences2008，51，10： | 5 |
| 9 | Annual Consultation on the Likelihood of Earthquakes in Continental China: Its Scientific and Practical Merits显示文摘Since the 1970s, Chinese seismologists have started to conduct the Annual Consultation on the Likelihood of Coming Earthquakes in the Next Year. This approach has unique scientific and practical merits either as an active response to the social needs in the situation that earthquake prediction research meets many difficulties, or as a real forward prediction test persistently conducted for 1/3 century. It is a pity that such an approach has not been well-known by international seismological community, and the scientific merits of such an endeavor is sometimes regrettably underestimated. | Wu Zhongliang Liu Jie Zhu Chuanzhen Jiang Changsheng Huang Fuqiong | 2007 | Earthquake Research in China2007，21，4： | 5 |
| 10 | Adaptive functional link network control of near-space vehicles with dynamical uncertainties显示文摘The control law design for a near-space hypersonic vehicle(NHV) is highly challenging due to its inherent nonlinearity,plant uncertainties and sensitivity to disturbances.This paper presents a novel functional link network(FLN) control method for an NHV with dynamical thrust and parameter uncertainties.The approach devises a new partially-feedback-functional-link-network(PFFLN) adaptive law and combines it with the nonlinear generalized predictive control(NGPC) algorithm.The PFFLN is employed for approximating uncertainties in flight.Its weights are online tuned based on Lyapunov stability theorem for the first time.The learning process does not need any offline training phase.Additionally,a robust controller with an adaptive gain is designed to offset the approximation error.Finally,simulation results show a satisfactory performance for the NHV attitude tracking,and also illustrate the controller's robustness. | Yanli Du Qingxian Wu Changsheng Jiang Jie Wen | 2010 | Journal of Systems Engineering and Electronics2010，21，5： | 5 |
| 11 | Properties of three seismic events in September 2017 in the northern Korean Peninsula from moment tensor inversion显示文摘In September 2017 three noticeable seismic events occurred in the northern Korean Peninsula(Fig.1;Table 1).Democratic People’s Republic of Korea(DPRK)authorities announced that the first M6.3 event on September 3rd was a‘‘successfully conducted hydrogen-bomb test'.The M4.6 event,some 8 min followed,was regarded as an implosion.However,it is still not clear | Libo Han Zhongliang Wu Changsheng Jiang Jie Liu | 2017 | Science Bulletin2017，62，23： | 5 |
| 12 | Electric-field-controlled superconductor–ferromagnetic insulator transition显示文摘Superconductivity beyond electron-phonon mechanism is always twisted with magnetism. Based on a new field-effect transistor with solid ion conductor as the gate dielectric(SIC-FET), we successfully achieve an electric-field-controlled phase transition between superconductor and ferromagnetic insulator in(Li,Fe)OHFeSe. A dome-shaped superconducting phase with optimal T_c of 43K is continuously tuned into a ferromagnetic insulating phase, which exhibits an electric-field-controlled quantum critical behavior. The origin of the ferromagnetism is ascribed to the order of the interstitial Fe ions expelled from the(Li,Fe)OH layers by gating-controlled Li injection. These surprising findings offer a unique platform to study the relationship between superconductivity and ferromagnetism in Fe-based superconductors. This work also demonstrates the superior performance of the SIC-FET in regulating physical properties of layered unconventional superconductors. | Likuan Ma Bin Lei Naizhou Wang Kaishuai Yang Dayong Liu Fanbao Meng Chao Shang Zeliang Sun Jianhua Cui Changsheng Zhu Tao Wu Zhe Sun Liangjian Zou Xianhui Chen | 2019 | Science Bulletin2019，64，10： | 4 |
| 13 | Robotic and laparoscopic hybrid pancreaticoduodenectomy: surgical techniques and early outcomes显示文摘In recent years,the use of minimally invasive surgery in pancreas has been gradually rising in importance.There has been growing interest in performing pancreatectomy by the laparoscopic approach.However,laparoscopic pancreaticoduodenectomy (LPD) is very complicated and difficult to control and requires surgeons to have a high level of laparoscopic skills.Since LPD provides no significant benefits in terms of blood loss,morbidity rate,or median hospital stay,robotic pancreaticoduodenectomy (RPD) gained surgeons' attention.The increased dexterity granted by endo-wristed instruments,the improved three-dimensional vision,and the computer filtration of the surgeon's movements have brought minimally invasive surgery into a new era.1 RPD can overcome most of the natural limitations and drawbacks of LPD mentioned above.Therefore,we propose a hybrid of laparoscopic and robotic approaches (RLPD),which may be more beneficial and effective to pancreaticoduodenectomy as it combines the advantages of both LPD and RPD.In this paper,we report our initial experience with the new method RLPD and analyze its surgical techniques and early outcomes. | Ji Wu Ding Kai Kao Xiaoming He Changsheng Li Ning Li Jieshou | 2014 | Chinese Medical Journal2014，，16： | 4 |
| 14 | Genetic models of structural traps related to normal faults in the Putaohua Oilfield,Songliao Basin显示文摘The Putaohua Oilfi eld is a fault-prolifi c area and the faults have close relation with structural traps. The genetic models of the structural traps in the Putaohua Oilfi eld can be divided into two types: individual fault model and multi-fault interaction model. This is based on the description of displacement distribution of typical individual normal faults, the geometry of the footwall and hanging wall, and the analysis of the interaction between faults and the corresponding change in geometry when the faults grow. The individual fault model is that the displacement reaches a maximum at or near the center of fault and decreases toward the fault tips, so a half-graben is formed on the hanging wall of the fault and a half-anticline is formed on the footwall because of the isostatic process. The multi-fault interaction model is that during the growth of faults, they overlap and interact with each other, and accommodation zones are formed in the overlapping segments. The accommodation zones are favorable targets for hydrocarbon exploration, and the trap characteristics are dependent on the extent of overlap and occurrence of faults. The multi-fault interaction model can be subdivided into three types: synthetic accommodation zone, convergent accommodation zone and divergent accommodation zone. Hydrocarbon migration and accumulation models of each type have been developed. The hydrocarbon migration and accumulation models of the traps with different genetic models have their own characteristics in the different stages of fault growth. | Sun Simin Wu Xinsong Liu Hongtao Wang Changsheng | 2008 | Petroleum Science2008，5，4： | 3 |
| 15 | Seismic comprehensive forecast based on modified project pursuit regression显示文摘In the research of projection pursuit for seismic comprehensive forecast,the algorithm of projection pursuit regression(PPR) is one of most applicable methods.But generally,the algorithm structure of the PPR is very complicated.By partial smooth regressions for many times,it has a large amount of calculation and complicated extrapolation,so it is easily trapped in partial solution.On the basis of the algorithm features of the PPR method,some solutions are given as below to aim at some shortcomings in the PPR calculation:to optimize project direction by using particle swarm optimization instead of Gauss-Newton algorithm,to simplify the optimal process with fitting ridge function by using Hermitian polynomial instead of piecewise linear regression.The overall optimal ridge function can be obtained without grouping the parameter optimization.The modeling capability and calculating accuracy of projection pursuit method are tested by means of numerical emulation technique on the basis of particle swarm optimization and Hermitian polynomial,and then applied to the seismic comprehensive forecasting models of polydimensional seismic time series and general disorder seismic samples.The calculation and analysis show that the projection pursuit model in this paper is characterized by simplicity,celerity and effectiveness.And this model is approved to have satisfactory effects in the real seismic comprehensive forecasting,which can be regarded as a comprehensive analysis method in seismic comprehensive forecast. | Anxu Wu Xiangdong Lin Changsheng Jiang Yongxian Zhang Xiaodong Zhang Mingxiao Li Ping'an Li | 2009 | Earthquake Science2009，22，5： | 3 |
| 16 | Characteristics of U-pattern distribution of high-concentration ^(210)Pb in surface air at central Guizhou,China显示文摘A better understanding of the variation of 210Pb concentrations in the surface air is the key to trace lake sedimentation and catchment erosion, to establish and vali-date the global diffusion model of contaminants, and to as-sess the impact of natural radiation on the ecological system. Basing on the study progresses of the sedimentation, the at-mospheric model and the unique environmental background in the Yunnan-Guizhou Plateau, and starting from December 20, 2001, we made use of a 500 NE Type aerosol sampler to collect filter samples, once a week in the past consecutive two years, in the surface air at Mt. Guanfeng, Guiyang City, China. Synchronous detailed γ -energy spectrometric obser-vations of 210Pb concentrations at both Chinese and U.S. laboratories have shown that the average monthly 210Pb concentration displays a regular U-patterns distribution of annual variations, with high values appearing in winter and low values in late spring and summer. The average annual 210Pb concentrations are estimated to be 2.77±0.63 mBq/m3, about 4 times the average maximum concentrations reported from quite a number of monitoring stations throughout the world. The possible factors affecting the sources of 210Pb in the surface air in the central part of Guizhou Province are: Release of 222Rn from the U-Ra series enriched in the soils; chemical weathering of carbonate rocks; the exploitation, processing and utilization of coal and phosphorous resources. The principal factor controlling the high 210Pb concentrations in the surface air in the central Guizhou and their annual U-pattern distribution is the release of 222Rn. The average monthly 210Pb concentrations show a good negative power- function relationship with increasing precipitation and also show a good negative linear-function relationship with the rise of air temperature in month grouping. Group No.1 (June to November) reflects a relatively low release of 222Rn from soils in relatively high temperature seasons; Group No.2 (December to May) mirrors a relatively high release of 222Rn from soils in relatively low temperature seasons. The average monthly 210Pb concentrations simulated in terms of the pre-cipitation and air temperature are in good consistency with the measured values, revealing that the regular U-pattern distribution characteristics of 210Pb concentrations in the surface air in the central Guizhou are controlled predomi-nantly by regional precipitation and air temperature. Meanwhile, it is also indicated that the magnitude of varia-tion of air temperature and precipitation within the same year also constrains the ratio of high values over low values of average monthly 210Pb concentrations. On a month time scale, precipitation and air temperature are a main factor affecting the release of 222Rn from soils (rocks). In this aspect strong evidence has been obtained. | WAN Guojiang YANG Wei WANG Shilu WAN Enyuan WU Fengchang S.N.LEE WANG Changsheng HUANG Ronggui | 2005 | Chinese Science Bulletin2005，50，16： | 2 |
| 17 | Micro-earthquakes “Just-underneath” Seismic Stations as Ground Truth Events——Application to the 2008 Wenchuan Aftershock Sequence显示文摘Analyzing the aftershock sequence of the 2008 Wenchuan earthquake,we considered 26 micro-earthquakes 'just underneath' seismic stations.Making use of such special station-event configurations to determine the depth of these micro-earthquakes provided accurate relocation of aftershocks with a reference set of 'ground truth(GT)events'. | Liu Chun Wu Zhongliang Jiang Changsheng | 2008 | Earthquake Research in China2008，22，4： | 2 |
| 18 | Optical absorption of vanadium oxide films during lithium inner calation 显示文摘 | Guangming Wu Kaifang Du Changsheng Xia | 2005 | Thin Solid Films2005，485，12： | 1 |
| 19 | Structure transition comparison between the amorphous nanosize particles and coarse - grained polycrystailine of cobalt显示文摘 | Changsheng Xie Junhui Hu Run Wu | | 0，，： | 1 |
| 20 | Condensation formation of Co-Fe nanoparticles and the related magnetic properties 显示文摘 | Run Wu Changsheng Xie | 2003 | Materials Letters2003，57，9： | 1 |
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