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| 1 | Remaining useful life prediction based on the Wiener process for an aviation axial piston pump显示文摘An aviation hydraulic axial piston pump's degradation from comprehensive wear is a typical gradual failure model.Accurate wear prediction is difficult as random and uncertain characteristics must be factored into the estimation.The internal wear status of the axial piston pump is characterized by the return oil flow based on fault mechanism analysis of the main frictional pairs in the pump.The performance degradation model is described by the Wiener process to predict the remaining useful life(RUL) of the pump.Maximum likelihood estimation(MLE) is performed by utilizing the expectation maximization(EM) algorithm to estimate the initial parameters of the Wiener process while recursive estimation is conducted utilizing the Kalman filter method to estimate the drift coefficient of the Wiener process.The RUL of the pump is then calculated according to the performance degradation model based on the Wiener process.Experimental results indicate that the return oil flow is a suitable characteristic for reflecting the internal wear status of the axial piston pump,and thus the Wiener process-based method may effectively predicate the RUL of the pump. | WangXingjian LinSiru Wang Shaoping HeZhaomin ZhangChao | 2016 | Chinese Journal of Aeronautics2016，29，3： | 28 |
| 2 | Mechanical wear debris feature,detection,and diagnosis:A review显示文摘Mechanical debris is an important product of friction wear, which is also a crucial approach to know the running status of a machine. Many studies have been conducted on mechanical debris in related fields such as tribology, instrument, and diagnosis. This paper presents a comprehensive review of these studies, which summarizes wear mechanisms(e.g., abrasive wear, fatigue wear, and adhesive wear) and debris features(e.g., concentration(number), size, morphology, and composition), analyzes detection methods principles(e.g., offline: spectrograph and ferrograph, and online: optical method, inductive method, resistive-capacitive method, and acoustic method),reviews developments of online inductive methods, and investigates the progress of debris-based diagnosis. Finally, several notable problems are discussed for further studies. | Wei HONG Wenjian CAI Shaoping WANG Mileta M.TOMOVIC | 2018 | Chinese Journal of Aeronautics2018，31，5： | 19 |
| 3 | Flow field and pressure loss analysis of junction and its structure optimization of aircraft hydraulic pipe system显示文摘The flow field in junction is complicated due to the ripple property of oil flow velocity and different frequencies of two pumps in aircraft. In this study, the flow fields of T-junction and Y-junction were analyzed using shear stress transport (SST) model in ANSYS/CFX software. The simulation results identified the variation rule of velocity peak in T-junction with different frequencies and phase-differences, meanwhile, the eddy and velocity shock existed in the corner of the T-junction, and the limit working state was obtained. Although the eddy disappeared in Y-junction, the velocity shock and pressure loss were still too big. To address these faults, an arc-junction was designed. Based on the flow fields of arc-junction, the eddy in the junction corner disappeared and the maximum of velocity peak declined compared to T-and Y-junction. Additionally, 8 series of arc-junction with different radiuses were tested to get the variation rule of velocity peak. Through the computation of the pressure loss of three junctions, the arc-junction had a lowest loss value, and its pressure loss reached the minimum value when the curvature radius is 35.42 mm, meanwhile, the velocity shock has decreased in a low phase. | Li Xin Wang Shaoping | 2013 | Chinese Journal of Aeronautics2013，26，4： | 17 |
| 4 | Design and Simulation of Electro-hydrostatic Actuator with a Built-in Power Regulator显示文摘电动静液作动器(EHA)是一种功率电传(PBW)作动器,可将电能输入转换为局部液压能以实现飞行控制。通过取消中央液压源和液压管路,电动静液作动器的可靠性和效率获得提高,但是带宽和刚度受到限制。为解决上述问题,本文提出了一种基于能量调节的新型电动静液作动器。能量调节器由高压蓄能器和比例阀组成,可以根据不同的控制需求储存和管理液压能。提出了转移体积的概念用于评价调节器的工作能力。液压锁用于保持作动器的输出位置。仿真结果表明:经过优化的新结构有效扩展了系统频宽。 | Kang Rongjie Jiao Zongxia Wang Shaoping Chen Lisha | 2009 | Chinese Journal of Aeronautics2009，22，6： | 16 |
| 5 | Nonlinear dynamic modeling of a helicopter planetary gear train for carrier plate crack fault diagnosis显示文摘Planetary gear train plays a significant role in a helicopter operation and its health is of great importance for the flight safety of the helicopter.This paper investigates the effects of a planet carrier plate crack on the dynamic characteristics of a planetary gear train,and thus finds an effective method to diagnose crack fault.A dynamic model is developed to analyze the torsional vibration of a planetary gear train with a cracked planet carrier plate.The model takes into consideration nonlinear factors such as the time-varying meshing stiffness,gear backlash and viscous damping.Investigation of the deformation of the cracked carrier plate under static stress is performed in order to simulate the dynamic effects of the planet carrier crack on the angular displacement of carrier posts.Validation shows good accuracy of the developed dynamic model in predicting dynamic characteristics of a planetary gear train.Fault features extracted from predictions of the model reveal the correspondence between vibration characteristic and the conditions(length and position)of a planet carrier crack clearly. | Fan Lei Wang Shaoping Wang Xingjian Han Feng Lyu Huawei | 2016 | Chinese Journal of Aeronautics2016，29，3： | 16 |
| 6 | Fault diagnosis of an intelligent hydraulic pump based on a nonlinear unknown input observer显示文摘Hydraulic piston pumps are commonly used in aircraft. In order to improve the viability of aircraft and energy efficiency, intelligent variable pressure pump systems have been used in aircraft hydraulic systems more and more widely. Efficient fault diagnosis plays an important role in improving the reliability and performance of hydraulic systems. In this paper, a fault diagnosis method of an intelligent hydraulic pump system(IHPS) based on a nonlinear unknown input observer(NUIO) is proposed. Different from factors of a full-order Luenberger-type unknown input observer, nonlinear factors of the IHPS are considered in the NUIO. Firstly, a new type of intelligent pump is presented, the mathematical model of which is established to describe the IHPS. Taking into account the real-time requirements of the IHPS and the special structure of the pump, the mechanism of the intelligent pump and failure modes are analyzed and two typical failure modes are obtained. Furthermore, a NUIO of the IHPS is performed based on the output pressure and swashplate angle signals. With the residual error signals produced by the NUIO, online intelligent pump failure occurring in real-time can be detected. Lastly, through analysis and simulation, it is confirmed that this diagnostic method could accurately diagnose and isolate those typical failure modes of the nonlinear IHPS. The method proposed in this paper is of great significance in improving the reliability of the IHPS. | Zhonghai MA Shaoping WANG Jian SHI Tongyang LI Xingjian WANG | 2018 | Chinese Journal of Aeronautics2018，31，2： | 13 |
| 7 | Reliability and safety analysis of redundant vehicle management computer system显示文摘Redundant techniques are widely adopted in vehicle management computer(VMC) to ensure that VMC has high reliability and safety.At the same time,it makes VMC have special characteristics,e.g.,failure correlation,event simultaneity,and failure self-recovery.Accordingly,the reliability and safety analysis to redundant VMC system(RVMCS) becomes more diffcult.Aimed at the diffculties in RVMCS reliability modeling,this paper adopts generalized stochastic Petri nets to establish the reliability and safety models of RVMCS.Then this paper analyzes RVMCS operating states and potential threats to flight control system.It is verifed by simulation that the reliability of VMC is not the product of hardware reliability and software reliability,and the interactions between hardware and software faults can reduce the real reliability of VMC obviously.Furthermore,the failure undetected states and false alarming states inevitably exist in RVMCS due to the influences of limited fault monitoring coverage and false alarming probability of fault monitoring devices(FMD).RVMCS operating in some failure undetected states will produce fatal threats to the safety of flight control system.RVMCS operating in some false alarming states will reduce utility of RVMCS obviously.The results abstracted in this paper can guide reliable VMC and effcient FMD designs.The methods adopted in this paper can also be used to analyze other intelligent systems' reliability. | Shi Jian Meng Yixuan Wang Shaoping Bian Mengmeng Yan Dungong | 2013 | Chinese Journal of Aeronautics2013，26，5： | 11 |
| 8 | Modeling of reliability and performance assessment of a dissimilar redundancy actuation system with failure monitoring显示文摘Actuation system is a vital system in an aircraft,providing the force necessary to move flight control surfaces.The system has a significant influence on the overall aircraft performance and its safety.In order to further increase already high reliability and safety,Airbus has implemented a dissimilar redundancy actuation system(DRAS) in its aircraft.The DRAS consists of a hydraulic actuation system(HAS) and an electro-hydrostatic actuation system(EHAS),in which the HAS utilizes a hydraulic source(HS) to move the control surface and the EHAS utilizes an electrical supply(ES) to provide the motion force.This paper focuses on the performance degradation processes and fault monitoring strategies of the DRAS,establishes its reliability model based on the generalized stochastic Petri nets(GSPN),and carries out a reliability assessment considering the fault monitoring coverage rate and the false alarm rate.The results indicate that the proposed reliability model of the DRAS,considering the fault monitoring,can express its fault logical relation and redundancy degradation process and identify potential safety hazards. | Wang Shaoping Cui Xiaoyu Shi Jian Mileta M.Tomovic Jiao Zongxia | 2016 | Chinese Journal of Aeronautics2016，29，3： | 10 |
| 9 | Adaptive Fuzzy Torque Control of Passive Torque Servo Systems Based on Small Gain Theorem and Input-to-state Stability显示文摘Passive torque servo system (PTSS) simulates aerodynamic load and exerts the load on actuation system, but PTSS endures position coupling disturbance from active motion of actuation system, and this inherent disturbance is called extra torque. The most important issue for PTSS controller design is how to eliminate the influence of extra torque. Using backstepping technique, adaptive fuzzy torque control (AFTC) algorithm is proposed for PTSS in this paper, which reflects the essential characteristics of PTSS and guarantees transient tracking performance as well as final tracking accuracy. Takagi-Sugeno (T-S) fuzzy logic system is utilized to compensate parametric uncertainties and unstructured uncertainties. The output velocity of actuator identified model is introduced into AFTC aiming to eliminate extra torque. The closed-loop stability is studied using small gain theorem and the control system is proved to be semiglobally uniformly ultimately bounded. The proposed AFTC algorithm is applied to an electric load simulator (ELS), and the comparative experimental results indicate that AFTC controller is effective for PTSS. | WANG Xingjian | 2012 | Chinese Journal of Aeronautics2012，25，6： | 10 |
| 10 | Variable load failure mechanism for high-speed load sensing electro-hydrostatic actuator pump of aircraft显示文摘This paper presents a novel transient lubrication model for the analysis of the variable load failure mechanism of high-speed pump used in Load Sensing Electro-Hydrostatic Actuator(LS-EHA). Focusing on the slipper/swashplate pair partial abrasion, which is considered as the dominant failure mode in the high-speed condition, slipper dynamic models are established. A forth sliding motion of the slipper on the swashplate surface is presented under the fact that the slipper center of mass will rotate around the center of piston ball when the swashplate angle is dynamically adjusted. Besides, extra inertial tilting moments will be produced for the slipper based on the theorem on translation of force, which will increase rapidly when LS-EHA pump operates under highspeed condition. Then, a dynamic lubricating model coupling with fluid film thickness field, temperature field and pressure field is proposed. The deformation effects caused by thermal deflection and hydrostatic pressure are considered. A numerical simulation model is established to validate the effectiveness and accuracy of the proposed model. Finally, based on the load spectrum of aircraft flight profile, the variable load conditions and the oil film characteristics are analyzed, and series of variable load rules of oil film thickness with variable speed/variable pressure/variable displacement are concluded. | Cun SHI Shaoping WANG Xingjian WANG Yixin ZHANG | 2018 | Chinese Journal of Aeronautics2018，31，5： | 8 |
| 11 | An adaptive-order particle filter for remaining useful life prediction of aviation piston pumps显示文摘An accurate estimation of the remaining useful life(RUL) not only contributes to an effective application of an aviation piston pump, but also meets the necessity of condition based maintenance(CBM). For the current RUL evaluation methods, a model-based method is inappropriate for the degradation process of an aviation piston pump due to difficulties of modeling, while a data-based method rarely presents high-accuracy prediction in a long period of time. In this work,an adaptive-order particle filter(AOPF) prognostic process is proposed aiming at improving long-term prediction accuracy of RUL by combining both kinds of methods. A dynamic model is initialized by a data-driven or empirical method. When a new observation comes, the prior state distribution is approximated by a current model. The order of the current model is updated adaptively by fusing the information of the observation. Monte Carlo simulation is employed for estimating the posterior probability density function of future states of the pump's degradation.With updating the order number adaptively, the method presents a higher precision in contrast with those of traditional methods. In a case study, the proposed AOPF method is adopted to forecast the degradation status of an aviation piston pump with experimental return oil flow data, and the analytical results show the effectiveness of the proposed AOPF method. | Tongyang LI Shaoping WANG Jian SHI Zhonghai MA | 2018 | Chinese Journal of Aeronautics2018，31，5： | 7 |
| 12 | Variations of precipitation characteristics during the period 1960–2014 in the Source Region of the Yellow River,China显示文摘Precipitation, a natural feature of weather systems in the Earth, is vitally important for the environment of any region. Under global climate change condition, the characteristics of precipitation have changed as a consequence of enhanced global hydrological cycle. The source region of the Yellow River(SRYR), locating within the Qinghai-Tibet Plateau, is sensitive to the global climate change due to its complex orography and fragile ecosystem. To understand the precipitation characteristics and its impacts on the environment in the region, we studied the characteristics of rainy days and precipitation amount of different precipitation classes, such as light(0–5 and 5–10 mm), moderate(10–15, 15–20 and 20–25 mm) and heavy(≥25 mm) rains by analyzing the precipitation data of typical meteorological stations in the SRYR during the period 1961–2014, as well as the trends of persistent rainfall events and drought events. Results showed that annual average precipitation in this area had a non-significant(P>0.05) increasing trend, and 82.5% of the precipitation occurred from May to September. Rainy days of the 0–5 mm precipitation class significantly decreased, whereas the rainy days of 5–10, 10–15, and 20–25 mm precipitation classes increased and that of ≥25 mm precipitation class decreased insignificantly. The persistent rainfall events of 1-or 2-day and more than 2-day showed an increasing trend, with the 1-or 2-day events being more frequent. Meanwhile, the number of short drought periods(≤10 days) increased while long drought periods(>10 days) decreased. Since the 0–5 mm precipitation class had a huge impact on the grasslands productivity; the 5–10, 10–15, and 20–25 mm precipitation classes had positive effects on vegetation which rely on the deep soil water through moving nutrients and water into the root zone of these vegetation or through the plant-microbe interactions; the ≥25 mm precipitation class contributed to the floods; and more persistent rainfall events and fewer long drought events inferred positive effects on agriculture. Thus, these results indicate grassland degradation, less risk of floods, and the upgrading impact of climate change on agriculture. This study may provide scientific knowledge for policymakers to sustain the eco-environmental resources in the SYSR. | Mudassar IQBAL WEN Jun WANG Shaoping TIAN Hui Muhammad ADNAN | 2018 | Journal of Arid Land2018，10，3： | 6 |
| 13 | Genome-and transcriptome-wide association studies provide insights into the genetic basis of natural variation of seed oil content in Brassica napus显示文摘Seed oil content(SOC)is a highly important and complex trait in oil crops.Here,we decipher the genetic basis of natural variation in SOC of Brassica napus by genome-and transcriptome-wide association studies using 505 inbred lines.We mapped reliable quantitative trait loci(QTLs)that control SOC in eight environments,evaluated the effect of each QTL on SOC,and analyzed selection in QTL regions during breeding.Six-hundred and ninety-two genes and four gene modules significantly associated with SOC were identified by analyzing population transcriptomes from seeds.A gene prioritization framework,POCKET(prioritizing the candidate genes by incorporating information on knowledge-based gene sets,effects of variants,genome-wide association studies,and transcriptome-wide association studies),was implemented to determine the causal genes in the QTL regions based on multi-omic datasets.A pair of homologous genes,BnPMT6s,in two QTLs were identified and experimentally demonstrated to negatively regulate SOC.This study provides rich genetic resources for improving SOC and valuable insights toward understanding the complex machinery that directs oil accumulation in the seeds of B.napus and other oil crops. | Shan Tang Hu Zhao Shaoping Lu Liangqian Yu Guofang Zhang Yuting Zhang Qing-Yong Yang Yongming Zhou Xuemin Wang Wei Ma Weibo Xie Liang Guo | 2021 | Molecular Plant2021，14，3： | 6 |
| 14 | Reliability estimation of mechanical seals based on bivariate dependence analysis and considering model uncertainty显示文摘The reliability estimation of mechanical seals is of crucial importance due to their wide applications in pumps in various mechanical systems.Failure of mechanical seals might cause leakage,and might lead to system failure and other relevant consequences.In this study,the reliability estimation for mechanical seals based on bivariate dependence analysis and considering model uncertainty is proposed.The friction torque and leakage rate are two degradation performance indicators of mechanical seals that can be described by the Wiener process,Gamma process,and inverse Gaussian process.The dependence between the two indicators can be described by different copula functions.Then the model uncertainty is considered in the reliability estimation using the Bayesian Model Average(BMA)method,while the unknown parameters in the model are estimated by Bayesian Markov Chain Monte Carlo(MCMC)method.A numerical simulation study and fatigue crack study are conducted to demonstrate the effectiveness of the BMA method to capture model uncertainty.A degradation test of mechanical seals is conducted to verify the proposed model.The optimal stochastic process models for two performance indicators and copula function are determined based on the degradation data.The results show the necessity of using the BMA method in degradation modeling. | Rentong CHEN Chao ZHANG Shaoping WANG Yujie QIAN | 2021 | Chinese Journal of Aeronautics2021，34，5： | 5 |
| 15 | Integrated genomic analysis identifies deregulated JAK/STAT-MYC-biosynthesis axis in aggressive NK-cell leukemia显示文摘好攻击的 NK 房间白血病(ANKL ) 是在从亚洲的人之中是更流行的 NK 房间瘤的一种稀罕形式并且中央并且南美洲。病人们通常在天以内死到月,甚至在收到迅速的治疗学的管理以后。这里,我们由集成整个染色体执行了 ANKL 的第一全面研究, transcriptome 并且定序指向,象功能的试金一样的 cytokine 数组。在 JAK-STAT 小径的变化在 48% 被识别(14/29 ) ANKL 病人,当细胞外的 STAT3 激发器 IL10 被 56 褶层的一般水准提高时(P < 0.0001 ) 在检查的所有病人的血浆。另外的经常变异的基因包括的 TP53 (34%) , TET2 (28%) , CREBBP (21%) 和 MLL2 (21%) 。耐心的 NK 白血病房间在多重新陈代谢的小径显示出 STAT3 phosphorylation, MYC 表示和 transcriptional 活动的突出的激活。机能上地, STAT3 激活和 MYC 表示为 ANKL 房间的增长和幸存是批评的。发信号的 STAT 调整了发信号的 MYC 抄写节目,和两 STAT, MYC 抄写被要求维持核苷酸合成和 glycolysis 的激活。一起, JAK-STAT 小径在 ANKL 为 genomic 改变和 IL10 刺激代表一个主要目标。这最新发现的 JAK/STAT-MYC-biosynthesis 轴可以在对待白血病的这种子类型为新奇治疗学的策略的发展提供机会。 | Liang Huang Dan Liu Na Wang Shaoping Ling Yuting Tang Jun Wu Lingtong Hao Hui Luo Xuelian Hu Lingshuang Sheng Lijun Zhu Di Wang Yi Luo Zhen Shang Min Xiao Xia Mao Kuangguo Zhou Lihua Cao Lili Dong Xinchang Zheng Pinpin Sui Jianlin He Shanlan Mo Jin Yan Qilin Ao Lugui Qiu Hongsheng Zhou Qifa Liu Hongyu Zhang Jianyong Li Jie Jin Li Fu Weili Zhao Jieping Chen Xin Du Guoliang Qing Hudan Liu Xin Liu Gang Huang Ding Ma Jianfeng Zhou Qian-fei Wang | 2018 | Cell Research2018，28，2： | 5 |
| 16 | Active fault tolerant control for vertical tail damaged aircraft with dissimilar redundant actuation system显示文摘This paper proposes an active fault-tolerant control strategy for an aircraft with dissimilar redundant actuation system(DRAS) that has suffered from vertical tail damage. A damage degree coefficient based on the effective vertical tail area is introduced to parameterize the damaged flight dynamic model. The nonlinear relationship between the damage degree coefficient and the corresponding stability derivatives is considered. Furthermore, the performance degradation of new input channel with electro-hydrostatic actuator(EHA) is also taken into account in the damaged flight dynamic model. Based on the accurate damaged flight dynamic model, a composite method of linear quadratic regulator(LQR) integrating model reference adaptive control(MRAC)is proposed to reconfigure the fault-tolerant control law. The numerical simulation results validate the effectiveness of the proposed fault-tolerant control strategy with accurate flight dynamic model.The results also indicate that aircraft with DRAS has better fault-tolerant control ability than the traditional ones when the vertical tail suffers from serious damage. | Wang Jun Wang Shaoping Wang Xingjian Shi Cun Mileta M.Tomovic | 2016 | Chinese Journal of Aeronautics2016，29，5： | 5 |
| 17 | Non-obstructive Coronary Artery Disease in Chinese Patients with Angina Diagnosed by Coronary Angiography:A Retrospective Study显示文摘Objective:This study aimed to estimate the proportion of non-obstructive coronary artery disease(CAD)patients in large percutaneous coronary intervention(PCI)centers in China.Methods:The study was conducted at 6 large PCI centers in China from January 1,2013 to December 31,2015.Demographic and clinical data were collected from medical records,prescription records,and laboratory reports of patients with symptoms of angina who underwent coronary angiography(CAG).Results:A total of 1713 patients were consecutively screened,1600 of whom were included in the study.CAG showed that 300 patients had non-obstructive CAD while 1300 had obstructive CAD.Among the 300 patients with non-obstructive CAD,203 displayed mild coronary stenosis(20%-49%)and 91 had normal coronary status(ie,<20%stenosis).Of the 1300 patients with obstructive CAD,61.6%(801/1300)had typical symptoms of angina,compared with 49.3%(148/300)for patients with nonobstructive CAD.In addition,there were more women than men in the non-obstructive CAD group,whereas the reverse was observed among obstructive CAD patients.Conclusion:The prevalence of non-obstructive CAD in the Chinese population with coronary heart disease was estimated to be approximately 20%.Additionally,typical angina symptoms were correlated with obstructive CAD,whereas female gender was identified as a risk factor for non-obstructive CAD. | Chengfei Peng Shaoping Nie Yingxian Sun Hui Chen Zuyi Yuan Yanjun Gong Xiaozeng Wang Yaling Han | 2021 | Cardiology Discovery2021，1，4： | 4 |
| 18 | Effect of pH,temperature and heating time on the formation of furan in sugar–glycine model systems显示文摘Furan(C4H4O)has been classified as a possible animal and human carcinogen by many international agencies.The formation of furan in three sugar–glycine models using glucose,fructose,and sucrose was investigated using headspace gas chromatography mass spectrometry method(HSGC–MS)with various dual combinations of three important heat processing conditions,i.e.pH,temperature,and heating time.Results indicated that furan levels from sugar–glycine model systems during the thermal processing can be attributed to selective sugar types,pH,temperature,and heating time.In glucose–glycine and fructose–glycine system,the lowest furan level was detected in acid condition but in sucrose–glycine system furan formed significantly lower(P<0.05)in acidic conditions the lowest furan level was found in alkaline conditions.The furan levels were observed to increase with heating time in all three model systems.Furthermore,less furan was generated in non-reducing sugar system(sucrose)than in reducing sugar system(glucose and fructose).Therefore,they demonstrate the possibility of limiting the formation of furan in heat processed foods by both the careful selection of carbohydrates(i.e.non-reducing sugars and reducing sugars)ingredients and appropriate processing conditions.©2013 Beijing Academy of Food Sciences.Production and hosting by Elsevier B.V.All rights reserved. | Shaoping Nie Jungen Huang Jielun Hu Yanan Zhang Sunan Wang Chang Li Massimo Marcone Mingyong Xie | 2013 | Food Science and Human Wellness2013，2，2： | 4 |
| 19 | Motion synchronization in a dual redundant HA/EHA system by using a hybrid integrated intelligent control design显示文摘This paper presents an integrated fuzzy controller design approach to synchronize a dissimilar redundant actuation system of a hydraulic actuator(HA) and an electro-hydrostatic actuator(EHA) with system uncertainties and disturbances.The motion synchronous control system consists of a trajectory generator,an individual position controller for each actuator,and a fuzzy force tracking controller(FFTC) for both actuators.The trajectory generator provides the desired motion dynamics and designing parameters of the trajectory which are taken according to the dynamic characteristics of the EHA.The position controller consists of a feed-forward controller and a fuzzy position tracking controller(FPTC) and acts as a decoupled controller,improving position tracking performance with the help of the feed-forward controller and the FPTC.The FFTC acts as a coupled controller and takes into account the inherent coupling effect.The simulation results show that the proposed controller not only eliminates initial force fighting by synchronizing the two actuators,but also improves disturbance rejection performance. | Waheed Ur Rehman Wang Shaoping Wang Xingjian Fan Lei Kamran Ali Shah | 2016 | Chinese Journal of Aeronautics2016，29，3： | 4 |
| 20 | The threshold effect of the urban-rural income disparity on real economic growth in China显示文摘鉴于我国的城乡二元结构,本文使用泰尔指数度量和刻画我国的城乡收入差距及其变化特征。同时,本文设定了非线性阈值协整模型,以揭示我国改革开放以来城乡收入差距与实际经济增长的长期非线性关系。结果表明,长期非线性闽值关系在泰尔指数为0.100(阈值)处发生机制转移:1978—1991年,我国城乡收入差距对实际增长的长期效应为正;1992—1999年,收入差距对实际增长的效应由正向负平滑转换;1999年后,我国城乡收入差距对实际经济增长产生阻滞作用,且负效应呈逐年增加趋势。 | Wang Shaoping Ouyang Zhigang | 2008 | Social Sciences in China2008，29，3： | 4 |
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