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| 1 | 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 |
| 2 | An experimental study of the dual-loop control of electro-hydraulic load simulator (EHLS)显示文摘This paper investigates motion coupling disturbance(the so called surplus torque)in the hardware-in-the-loop(HIL)experiments.The‘‘velocity synchronization scheme’’was proposed by Jiao for an electro-hydraulic load simulator(EHLS)in 2004.In some situations,however,the scheme is limited in the implementation for certain reasons,as is the case when the actuator’s valve signal is not available or it is seriously polluted by noise.To solve these problems,a‘‘dual-loop scheme’’is developed for EHLS.The dual-loop scheme is a combination of a torque loop and a position synchronization loop.The role of the position synchronization loop is to decouple the motion disturbance caused by the actuator system.To verify the feasibility and effectiveness of the proposed scheme,extensive simulations are performed using AMESim.Then,the performance of the developed method is validated by experiments. | Wang Chengwen Jiao Zongxia Wu Shuai Shang Yaoxing | 2013 | Chinese Journal of Aeronautics2013，26，6： | 15 |
| 3 | Study on Friction Torque Loading with an Electro-hydraulic Load Simulator显示文摘针对特殊伺服机构的半实物仿真与测试,提出采用电液力矩负载模拟器施加摩擦力矩载荷。针对机械系统常用的Stribeck摩擦模型缺乏对静摩擦的数学描述这一问题,引入了带静摩擦描述的Stribeck摩擦模型。提出了'力矩-零速度'切换控制的新原理。解决了用电液力矩负载模拟器切换加载动、静摩擦力矩的问题;即采用零速度控制方式实现静摩擦的模拟;采用传统力矩控制实现动摩擦的模拟。建立了对象的数学模型,并设计了'力矩-零速度'切换控制器结构与'双阈值判断'算法。仿真表明,'力矩-零速度'切换控制,从原理上实现了静摩擦与动摩擦的真实模拟,能够复现伺服机构拖动大摩擦力负载运动的真实情况。 | Shang Yaoxing Jiao Zongxia Wang Xiaodong Zhao Sijun | 2009 | Chinese Journal of Aeronautics2009，22，6： | 14 |
| 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 | A practical nonlinear robust control approach of electro-hydraulic load simulator显示文摘This paper studies a nonlinear robust control algorithm of the electro-hydraulic load simulator(EHLS). The tracking performance of the EHLS is mainly limited by the actuator's motion disturbance, flow nonlinearity, and friction, etc. The developed controller is developed based on the nonlinear motion loading model. The problems of the actuator's disturbance and flow nonlinearity are considered. To address the friction problem, the friction model of the loading motor is identified experimentally. The friction disturbance is compensated using the obtained friction model. Therefore, this paper considers the main three factors comprehensively. The developed algorithm is easy to apply since the controller can be obtained just with one step back-stepping design. The stability of the developed algorithm is proven via Lyapunov analysis. Both co-simulation and experiments are performed to verify the effectiveness of this method. | Wang Chengwen Jiao Zongxia Wu Shuai Shang Yaoxing | 2014 | Chinese Journal of Aeronautics2014，27，3： | 10 |
| 6 | Fuzzy robust nonlinear control approach for electro-hydraulic flight motion simulator显示文摘A fuzzy robust nonlinear controller for hydraulic rotary actuators in flight motion simulators is proposed. Compared with other three-order models of hydraulic rotary actuators, the proposed controller based on first-order nonlinear model is more easily applied in practice, whose control law is relatively simple. It not only does not need high-order derivative of desired command,but also does not require the feedback signals of velocity, acceleration and jerk of hydraulic rotary actuators. Another advantage is that it does not rely on any information of friction, inertia force and external disturbing force/torque, which are always difficult to resolve in flight motion simulators. Due to the special composite vane seals of rectangular cross-section and goalpost shape used in hydraulic rotary actuators, the leakage model is more complicated than that of traditional linear hydraulic cylinders. Adaptive multi-input single-output(MISO) fuzzy compensators are introduced to estimate nonlinear uncertain functions about leakage and bulk modulus. Meanwhile, the decomposition of the uncertainties is used to reduce the total number of fuzzy rules. Different from other adaptive fuzzy compensators, a discontinuous projection mapping is employed to guarantee the estimation process to be bounded. Furthermore, with a sufficient number of fuzzy rules, the controller theoretically can guarantee asymptotic tracking performance in the presence of the above uncertainties, which is very important for high-accuracy tracking control of flight motion simulators.Comparative experimental results demonstrate the effectiveness of the proposed algorithm, which can guarantee transient performance and better final accurate tracking in the presence of uncertain nonlinearities and parametric uncertainties. | Han Songshan Jiao Zongxia Wang Chengwen Shang Yaoxing | 2015 | Chinese Journal of Aeronautics2015，28，1： | 7 |
| 7 | Review of fluid and control technology of hydraulic wind turbines显示文摘 | Maolin CAI Yixuan WANG Zongxia JIAO Yan SHI | 2017 | Frontiers of Mechanical Engineering2017，12，3： | 2 |
| 8 | RESEARCH ON CONTROL METHOD OF HYDRAULIC TORQUE SIMULATOR显示文摘An effective controller and compensator is designed by using the system identification and constant structure theory to realize the effective control. The experimental results indicate the extraneous torque can be decreased by 90% and the characteristics can be improved greatly by means of this kind of method. | Wang Shaoping Jiao Zongxia Hua Qing Institute of Automation Science and Electronic Enginearing, Beijing University of Aeronautics and Astronautics | 2001 | Chinese Journal of Mechanical Engineering2001，14，1： | 1 |
| 9 | Climate change and water security in the northern slope of the Tianshan Mountains显示文摘Water security is under threat worldwide from climate change. A warming climate would accelerate evaporationand cryosphere melting, leading to reduced water availability and unpredictable water supply. However, thewater crisis in the Northern Slope of Tianshan Mountains(NSTM) faces dual challenges because water demandsforfast-growing urban areas have put heavy pressure on water resources. The mountain-oasis-desert system featuresglacier-fed rivers that sustain intensive water use in the oasis and end in the desert as fragile terminal lakes.The complex balance between water conservation and economic development is subtle. This paper investigateschanges in hydroclimatic variables and water security-related issues on the NSTM. The spatiotemporal variationsin glaciers, climatic variables, rivers, lakes and reservoirs, groundwater, surface water, human water use, andstreamflow were analyzed for the past four decades. The results show that temperature in the NSTM exhibitedan apparent upward trend with a more significant warming rate in the higher altitude regions. Glacier massloss and shrinkage was strong. The average annual streamflow increased from 1980-1989 to 2006–2011 at mosthydrological stations. The monthly dynamics of surface water area showed notable variability at both inter-annual and seasonal scales, revealing the impacts of both natural and anthropogenic drivers on surface wateravailability in the region. The terrestrial water storage anomaly showed a decreasing trend, which might berelated to groundwater pumping for irrigation. Human water use for agriculture and industry grew with theincrease in cultivated land area and gross domestic product (GDP). The increased agricultural water use wasstrongly associated with the expansion of oases. It is unclear whether water availability would remain high underfuture climatic and hydrological uncertainties, posing challenges to water management. In the context of rapidurban growth and climate change, balancing water for humans and nature is vital in achieving the SustainableDevelopment Goals (SDGs) in NSTM. This study provides a baseline understanding of the interplay among water,climate change, and socio-economic development in NSTM. It would also shed light on wise water managementunder environmental changes for other rapidly developing mountain-oasis-desert systems worldwide. | Qiuhong Tang Xingcai Liu Yuanyuan Zhou Puyu Wang Zhongqin Li Zhixin Hao Suxia Liu Gang Zhao Bingqi Zhu Xinlin He Fadong Li Guang Yang Li He Haoxin Deng Zongxia Wang Xiang Ao Zhi Wang Paul P.J.Gaffney Lifeng Luo | 2022 | Geography and Sustainability2022，3，3： | 1 |
| 10 | The velocity synchronizing control on the electro-hydraulic load simulator显示文摘 | Jiao Zongxia Gao Junxia Hua Qing Wang Shaoping | 2004 | Chinese Jounenal of Aeronautics2004，，： | 1 |
| 11 | Ultrasonic constitutive model and its application in ultrasonic vibration-assisted milling Ti3Al intermetallics显示文摘Ultrasonic vibration-assisted technology is widely utilized in the performance research and manufacturing process of metallic materials owing to its advantages of introducing highfrequency acoustic systems. However, the acoustic plasticity constitutive model and potential mechanism, involving Ti3Al intermetallic compounds, have not yet been clarified. Therefore, the Ultrasonic-K-M hybrid acoustic constitutive model of Ti3Al was established by considering the stress superposition, acoustic thermal softening, acoustic softening and acoustic residual hardening effects according to the dislocation density evolution theory and crystal plasticity theory. Meanwhile, the mechanical behavior of ultrasonic vibration-assisted tension(UVAT) and microstructure of ultrasonic vibration-assisted milling(UVAM) for Ti3Al was investigated. Dislocation density to be overcome from initial deformation to failure of Ti3Al was calculated in UVAT and was verified in UVAM. The results indicated that the Ultrasonic-K-M model showed a good agreement with the experimental data. There was an obviously softening phenomenon after introducing the ultrasonic energy field in the Ti3Al whole deformation region, and the degree of softening was positively correlated with amplitude. Furthermore, the maximum reduction ratio in yield strength of Ti3Al was16 % and the maximum reduction value in ultimate tensile strength was 206.91 MPa. The elongation rose first and then fell as amplitude enlarged, but only as the vibration was applied in the whole deformation region, the elongation was always greater than 14.58 %. In addition, The UVAM process significantly reduced the dislocation density increment to be overcome for Ti3Al material removal by 1.37 times, and promoted dislocation motion and cancellation to make twisted dislocations evolve into parallel dislocations. As the amplitude increased to 4 μm, the depth of the disturbed area of the plastic deformation layer increased by a maximum of 2.5 times. | Guofu GAO Zongxia FU Yi WANG Xianrong PAN Daohui XIANG Bo ZHAO | 2023 | Chinese Journal of Aeronautics2023，36，7： | 0 |
| 12 | An aircraft brake control algorithm with torque compensation based on RBF neural network显示文摘The wheel brake system of an aircraft is the key to ensure its safe landing and rejected takeoff.A wheel’s slip state is determined by the brake torque and ground adhesion torque,both of which have a large degree of uncertainty.It is this nature that brings upon the challenge of obtaining high deceleration rate for aircraft brake control.To overcome the disturbances caused by the above uncertainties,a braking control law is designed,which consists of two parts:runway surface recognition and wheel’s slip state tracking.In runway surface recognition,the identification rules balancing safety and braking efficiency are defined,and the actual identification process is realized through recursive least square method with forgetting factors.In slip state tracking,the LuGre model with parameter adaptation and a brake torque compensation method based on RBF neural network are proposed,and their convergence are proven.The effectiveness of our control law is verified through simulation and ground experiment.Especially in the experiments on the ground inertial test bench,compared to the improved pressure-biased-modulation(PBM)anti-skid algorithm,fewer wheel slips occur,and the average deceleration rate is increased by 5.78%,which makes it a control strategy with potential for engineering applications. | Ning BAI Xiaochao LIU Juefei LI Zhuangzhuang WANG Pengyuan QI Yaoxing SHANG Zongxia JIAO | 2024 | Chinese Journal of Aeronautics2024，37，1： | 0 |
| 13 | The in-situ Ti alloying of aluminum alloys and its application in A356 alloys显示文摘This research has investigated the in-situ Ti alloying of aluminum alloys and its application to A356 alloys and wheels through the evaluation of microstructure and mechanical properties. The results showed that stable titanium content can be obtained by adding a small quantity of TiO2 into electrolyte of pure aluminum. Under this approach, a greater than 95% absorptivity of titanium was achieved, and the microstructure of the specimens was changed to fine equiaxed grains from coarse columnar grains in the pure aluminum. In comparison with the tradition A356 alloys and wheels, the corresponding microstructure in the testing A356 alloys and wheels was finer. Although the tensile strength was similar between the testing and the tradition A356 alloys and wheels, the ductility of the former (testing) is superior to that of the later (tradition), leading to an excellent combination of strength and ductility from the testing alloys and wheels. | Zongxia LIU Mousheng SONG Tianfu SONG Mingxing WANG Jiwen LI Yonggang WENG Zhiyang LIU Jingpei XIE | 2005 | China Foundry2005，2，1： | 0 |
| 14 | Design and analysis of linear oscillating motor for linearpump application-magnetic field, dynamics and thermotics显示文摘A linear oscillating motor is an electromag-netic actuator that can achieve short-stroke reciprocatingmovement directly without auxiliary transmission mechan-isms. It has been widely used in linear pump applicationsas the source of power and motion. However, because ofthe demand of high power density in a linear actuationsystem, the performance of linear oscillating motors hasbeen the focus of studies and deserves further research forhigh power density. In this paper, a general framework oflinear oscillating motor design and optimization isaddressed in detail, including the electromagnetic,dynamics, and thermal aspects. First, the electromagneticand dynamics characteristics are modeled to reveal theprinciple for optimization. Then, optimization and analysison magnetic structure, resonant system, and thermalfeatures are conducted, which provide the foundation forprototype development. Finally, experimental results areprovided for validation. As a whole, this process offerscomplete guidance for high power density linear oscillat-ing motors in linear pump applications. | Zongxia JIAO Tianyi WANG Liang YAN | 2016 | Frontiers of Mechanical Engineering2016，11，4： | 0 |
| 15 | Multi-parameter load sensing pump model simulation and flow rate characteristics research显示文摘Load sensing pumps have been widely used in diverse hydraulic systems.Studies show that structural parameters have undeniable impacts on the characteristics and efficiency of the load sensing pump.The main purpose of this article is to study the influence of load sensing pump structure parameters on flow characteristics.In the present study,a nonlinear multi-parameter model is proposed for this type of pump.In this model,different parameters,including spool clearance,spool covering amount,internal leakage are considered to reflect the displacement adjustment process of the load sensing pump.Moreover,a frequency sweep method is proposed to analyze the frequency domain of the nonlinear mathematical model.An experiment rig was built to study the influence of key structural parameters on the dynamic follow-up characteristics of the pump flow.The obtained results show that the diameter of the orifice d can significantly affect the working characteristics of the pump.It is found that a large diameter of the orifice d can improve the phase following ability of the system,while a small diameter of the orifice d can reduce the bypass flow rate and increase the amplitude following ability.This paper provides a new consideration to study the dynamic follow-up characteristics of the load sensing pump. | ZongXia JIAO Zhenyu WANG Xiaochao LIU HuJiang WANG Pengyuan QI Weizhi QIAO | 2022 | Chinese Journal of Aeronautics2022，35，12： | 0 |
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