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| 1 | 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 |
| 2 | 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 |
| 3 | Catalytic performance of Fe_3O_4-CoO/Al_2O_3 catalyst in ozonation of 2-(2,4-dichlorophenoxy) propionic acid,nitrobenzene and oxalic acid in water显示文摘Fe3O4-CoO/Al2O3 catalyst was prepared by incipient wetness impregnation using Fe(NO3) 3·9H2O and Co(NO3) 2·6H2O as the precursors,and its catalytic performance was investigated in ozonation of 2-(2,4-dichlorophenoxy) propionic acid(2,4-DP) ,nitrobenzene and oxalic acid.The experimental results indicated that Fe3O4-CoO/Al2O3 catalyst enabled an interesting improvement of ozonation eciency during the degradation of each organic pollutant,and the Fe3O4-CoO/Al2O3 catalytic ozonation system followed a radical-type mechanism.The kinetics of ozonation alone and Fe3O4-CoO/Al2O3 catalytic ozonation of three organic pollutants in aqueous solution were discussed under the mere consideration of direct ozone reaction and OH radical reaction to well investigate its performance.In the catalytic ozonation of 2,4-DP,the apparent reaction rate constants(k) were determined to be 1.456×10-2 min-1 for ozonation alone and 4.740×10-2 min-1 for O3/Fe3O4-CoO/Al2O3.And O3/Fe3O4-CoO/Al2O3 had a larger Rct(6.614×10-9) calculated by the relative method than O3 did(1.800×10-9) ,showing O3/Fe3O4-CoO/Al2O3 generated more hydroxyl radical.Similar results were also obtained in the catalytic ozonation of nitrobenzene and oxalic acid.The above results demonstrated that the catalytic performance of Fe3O4-CoO/Al2O3 in ozonation of studied organic substance was universal to a certain degree. | Shaoping Tong,Rui Shi,Hua Zhang,Chunan Ma College of Chemical Engineering and Materials Science,State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology,Zhejiang University of Technology,Hangzhou 310032,China | 2010 | Journal of Environmental Sciences2010，22，10： | 10 |
| 4 | 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 |
| 5 | 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 |
| 6 | 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 |
| 7 | 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 |
| 8 | Pipelines vibration analysis and control based on clamps'locations optimization of multi-pump system显示文摘The violent vibration of hydraulic pipelines in aircraft may cause faults or even an accident,especially for the large aircraft with the multi-pump system because of different vibration sources and complex pipelines system.Aiming to the vibration analysis and control of the multipump system,this paper proposed the clamps’locations optimization to minimize the system impedance at vibration frequencies.Firstly,the models of the flexible clamp and other components in multi-pump system were established,based on which,the system impedance was calculated by using Transfer Matrix Method(TMM);Secondly,the objective function is defined as weighted sum of system impedance at frequencies of different vibration sources.Then,the clamps’locations were altered to change the system impedance.Moreover,The Chaotic Swarm Particle Optimization(CPSO)algorithm was applied to obtain the optimal clamps’locations and the minimum value of objective function which decreased by 36.4%compared to the value of original clamps’locations;Finally,the experiments from vibration and pressure test with original and optimized clamps’locations verified the effectiveness of the system impedance calculation and clamps’locations optimization method. | Xin LI Weihao LI Jian SHI Qiang LI Shaoping WANG | 2022 | Chinese Journal of Aeronautics2022，35，6： | 2 |
| 9 | Evaluation of thermal effects on temperature-sensitive operating force of flow servo valve for fuel metering unit显示文摘The temperature-induced variation in operating force of flow control valves may result in performance degradation or even jam faults of fuel metering unit(FMU), which significantly affects the safety of aircrafts. In this work, an analytical modeling approach of temperature-sensitive operating-force of servo valve is proposed to investigate the temperature characteristics in varying temperature conditions. Considering the temperature effects, a new extended model of flow force is built and an analytical model of valve friction is also derived theoretically based on the dynamic clearance induced by thermal effects. The extremum condition of friction is obtained to analyze the characteristic-temperature points where jam faults occur easily. The numerical results show that flow force increases firstly and then decreases as temperature increases under a constant valve opening. The maximum friction of flow servo valve can be uniquely determined when the structural parameters and ambient temperature are given. The worst situation just happens at the characteristic-temperature points, which are linearly related to the axial temperature gradients of valve spool. Such evaluations may give an explanation for the temperature-induced jam faults of vulnerable valves and provide a reference for designers to determine a suitable workingtemperature range of valves in practice. | Yang ZHANG Shaoping WANG Jian SHI Xi WANG | 2020 | Chinese Journal of Aeronautics2020，33，6： | 2 |
| 10 | Multi-channel multiplexing quantum teleportation based on the entangled sideband modes显示文摘Quantum teleportation is a key primitive across a number of quantum information tasks and represents a fundamental ingredient for many quantum technologies. Channel capacity, other than the fidelity, becomes another focus of quantum communication. Here, we present a 5-channel multiplexing continuous-variable quantum teleportation protocol in the optical frequency comb system, exploiting five-order entangled sideband modes.Because of the resonant electro-optical modulation(EOM) that is specifically designed, the fidelities of five channels are greater than 0.78, which are superior to the no-cloning limit of 2∕3. This work provides a feasible scheme for implementing efficient quantum information processing. | YIMIAO WU QINGWEI WANG LONG TIAN †XIAOLI ZHANG JIAWEI WANG SHAOPING SHI YAJUN WANG YAOHUI ZHENG | 2022 | Photonics Research2022，10，8： | 2 |
| 11 | An energy-based coupling degradation propagation model and its application to aviation actuation system显示文摘The degradation of components in complex mechatronic systems involves multiple physical processes which will cause coupling interactions among nodes in the system.The interaction of nodes may be carried out not only by physical connections but also by the environment which cannot be described by single network using the traditional methods.In order to give out a unified model to quantitatively describe the coupling degradation spreading by both physical connections and environment,a novel Energy-Flow-Field Network(EFFN)and a coupling degradation model based on EFFN are proposed in this paper.The EFFN is driven by energy flow and the state transition of spatially related nodes is triggered by the dissipation energy.An application is conducted on aviation actuation system in which the degradation spreading by fluid-thermal-solid interaction is considered.The degradation path and the most probable fault reason can be obtained by combining the state transition and energy output of nodes,which is consistent with the given scenario. | Tongyang LI Shaoping WANG Jian SHI Enrico ZIO Xiaoyu CUI | 2020 | Chinese Journal of Aeronautics2020，33，4： | 1 |
| 12 | TGF‐β‐producing regulatory B cells induce regulatory T cells and promote transplantation tolerance显示文摘 | Kang Mi Lee Ryan T Stott Gaoping Zhao Julie SooHoo Wei Xiong Moh Moh Lian Lindsey Fitzgerald Shuai Shi Elsie Akrawi Ji Lei Shaoping Deng Heidi Yeh James F Markmann James I Kim | 2014 | Eur. J. Immunol2014，，： | 1 |
| 13 | Fault mode probability factor based fault-tolerant control for dissimilar redundant actuation system显示文摘This paper presents a Fault Mode Probability Factor(FMPF) based Fault-Tolerant Control(FTC) strategy for multiple faults of Dissimilar Redundant Actuation System(DRAS)composed of Hydraulic Actuator(HA) and Electro-Hydrostatic Actuator(EHA). The long-term service and severe working conditions can result in multiple gradual faults which can ultimately degrade the system performance, resulting in the system model drift into the fault state characterized with parameter uncertainty. The paper proposes to address this problem by using the historical statistics of the multiple gradual faults and the proposed FMPF to amend the system model with parameter uncertainty. To balance the system model precision and computation time, a Moving Window(MW) method is used to determine the applied historical statistics. The FMPF based FTC strategy is developed for the amended system model where the system estimation and Linear Quadratic Regulator(LQR) are updated at the end of system sampling period. The simulations of DRAS system subjected to multiple faults have been performed and the results indicate the effectiveness of the proposed approach. | Jun WANG Shaoping WANG Xingjian WANG Mileta M.TOMOVIC Cun SHI | 2018 | Chinese Journal of Aeronautics2018，31，5： | 1 |
| 14 | Information space of sensor networks:Lagrangian,energy-momentum tensor,and applications显示文摘It is a challenge to investigate the interrelationship between the geometric structure and performance of sensor networks due to the increasingly complex and diverse architecture of them.This paper presents two new formulations for the information space of sensor networks,including Lagrangian and energy–momentum tensor,which are expected to integrate sensor networks target tracking and performance evaluation from a unified perspective.The proposed method presents two geometric objects to represent the dynamic state and manifold structure of the information space of sensor networks.Based on that,the authors conduct the property analysis and target tracking of sensor networks.To the best of our knowledge,it is the first time to investigate and analyze the information energy-momentum tensor of sensor networks and evaluate the performance of sensor networks in the context of target tracking.Simulations and examples confirm the competitive performance of the proposed method. | Mo TAO Shaoping WANG Hong CHEN Han PAN Jian SHI Yuwei ZHANG | 2023 | Chinese Journal of Aeronautics2023，36，3： | 0 |
| 15 | Complete photonic bandgap in silicon nitride slab assisted by effective index difference between polarizations显示文摘The slab effective index difference between the transverse-electric(TE)and transverse-magnetic(TM)polarizations was utilized to obtain complete photonic bandgap(CPBG)in a silicon nitride(Si_(x)N_(y))photonic crystal slab.For this,coincident frequency range in the TE photonic bandgap(PBG)and TM PBG,which denotes the CPBGs of the slab,must be found with the same structure.Through adjusting the effective index pair of TE and TM polarizations by changing the thickness of the Si_(x)N_(y)core layer,and also optimizing the structure parameters within the photonic crystal plane,a large normalized CPBG of 5.62%was theoretically obtained in a slab of Si_(x)N_(y)with a refractive index of 2.5.Moreover,based on the obtained CPBG,a microcavity which could support both TE and TM polarization was theoretically demonstrated.The cavity modes for different polarizations were both well confined,which proved the reliability of the CPBG.In addition,using the same method,the lowest refractive index of Si_(x)N_(y)on silica slab for a CPBG could be extended to as low as 2.The results indicate that there is potential for development of various high-performance CPBG devices based on Si_(x)N_(y)slab technology. | Can Ma Jin Hou Chunyong Yang Ming Shi Shaoping Chen | 2022 | Frontiers of Optoelectronics2022，15，2： | 0 |
| 16 | Research of Test Method on Abrasion Resistance at Elevated Temperatures of Refractories显示文摘In this work,the factors and parameters of a test method on abrasion resistance at elevated temperatures were discussed and researched.First of all,the precision tests of the test method on abrasion resistance at elevated temperatures were conducted in 8 laboratories.The results such as the standard deviation and reproducibility show good repeatability and reliability.The relationship between the stability of refractory performance and the standard deviation of their wear value was analyzed.Then the impact of the heat treatment condition of unshaped refractories and oxidation of SiC sand as abrasive on the lost volume of the tested specimens was researched. | WANG Xiaoli SHI Gan HUANG Shaoping ZHANG Wei PENG Xigao | 2017 | China's Refractories2017，26，1： | 0 |
| 17 | Demonstration of fully-connected quantum communication network exploiting entangled sideband modes显示文摘Quantum communication network scales point-to-point quantum communication protocols to more than two detached parties,which would permit a wide variety of quantum communication applications.Here,we demonstrate a fully-connected quantum communication network,exploiting three pairs of Einstein–Podolsky–Rosen(EPR)entangled sideband modes,with high degree entanglement of 8.0 dB,7.6 dB,and 7.2 dB.Each sideband modes from a squeezed field are spatially separated by demultiplexing operation,then recombining into new group according to network requirement.Each group of sideband modes are distributed to one of the parties via a single physical path,making sure each pair of parties build their own private communication links with high channel capacity better than any classical scheme. | Fan Li Xiaoli Zhang Jianbo Li Jiawei Wang Shaoping Shi Long Tian Yajun Wang Lirong Chen Yaohui Zheng | 2023 | Frontiers of physics2023，18，4： | 0 |
| 18 | SAR performance-based fault diagnosis for electrohydraulic control system:A novel FDI framework for closed-loop system显示文摘Model-based fault diagnosis serves as an efficient and powerful technique in addressing fault detection and isolation(FDI)issues for control systems.However,the standard methods and their modifications still encounter some difficulties in algorithm design and application for complex higher-order systems.To avoid these difficulties,a novel fault diagnosis framework based on multiple performance indicators of closed-loop control system is proposed.Under this framework,a socalled performance residual vector is constructed to measure the differences between the real system and the nominal model in terms of system stability,accuracy,and rapidity(SAR)respectively.The criteria for quantification,normalization of the SAR residuals and the explicit mappings between the thresholds and the required performance are given.FDI can be easily achieved simultaneously by monitoring the normalized residual vector length and direction in the SAR performance residual space.A case study on electro-hydraulic servo control system of turbofan engine is adopted to demonstrate the effectiveness of the proposed method. | Yang ZHANG Shaoping WANG Jian SHI Xinyu YANG Jiarui ZHANG Xi WANG | 2022 | Chinese Journal of Aeronautics2022，35，10： | 0 |
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