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| 1 | Altered Wnt Signaling Pathway in Cognitive Impairment Caused by Chronic Intermittent Hypoxia: Focus on Glycogen Synthase Kinase-3β and β-catenin显示文摘 | Yue-Ying Pan Yan Deng Sheng Xie Zhi-Hua Wang YuWang Jie Ren Hui-Guo Liu | 2016 | Chinese Medical Journal2016，，7： | 14 |
| 2 | Spaceborne GPS receiver antenna phase center offset and variation estimation for the Shiyan 3 satellite显示文摘In determining the orbits of low Earth orbit(LEO) satellites using spaceborne GPS, the errors caused by receiver antenna phase center offset(PCO) and phase center variations(PCVs) are gradually becoming a major limiting factor for continued improvements to accuracy. Shiyan 3, a small satellite mission for space technology experimentation and climate exploration, was developed by China and launched on November 5, 2008. The dual-frequency GPS receiver payload delivers1 Hz data and provides the basis for precise orbit determination within the range of a few centimeters. The antenna PCO and PCV error characteristics and the principles influencing orbit determination are analyzed. The feasibility of PCO and PCV estimation and compensation in different directions is demonstrated through simulation and in-flight tests. The values of receiver antenna PCO and PCVs for Gravity Recovery and Climate Experiment(GRACE) and Shiyan 3 satellites are estimated from one month of data. A large and stable antenna PCO error, reaching up to10.34 cm in the z-direction, is found with the Shiyan 3 satellite. The PCVs on the Shiyan 3 satellite are estimated and reach up to 3.0 cm, which is slightly larger than that of GRACE satellites. Orbit validation clearly improved with independent k-band ranging(KBR) and satellite laser ranging(SLR) measurements. For GRACE satellites, the average root mean square(RMS) of KBR residuals improved from 1.01 cm to 0.88 cm. For the Shiyan 3 satellite, the average RMS of SLR residuals improved from 4.95 cm to 4.06 cm. | Gu Defeng Lai Yuwang Liu Junhong Ju Bing Tu Jia | 2016 | Chinese Journal of Aeronautics2016，29，5： | 11 |
| 3 | Precession–nutation correction for star tracker attitude measurement of STECE satellite显示文摘Space Technology Experiment and Climate Exploration(STECE) is a small satellite mission of China for space technology experiment and climate exploration. A new test star tracker and one ASTRO 10 star tracker have been loaded on the STECE satellite to test the new star tracker's measurement performance. However,there is no autonomous precession–nutation correction function for the test star tracker,which causes an apparent periodic deflection in the inter-boresight angle between the two star trackers with respect to each other of up to ±500 arcsec,so the precession and nutation effect needs to be considered while assessing the test star tracker. This paper researches on the precession–nutation correction for the test star tracker's attitude measurement and presents a precession–nutation correction method based on attitude quaternion data. The periodic deflection of the inter-boresight angle between the two star trackers has been greatly eliminated after the precession and nutation of the test star tracker's attitude data have been corrected by the proposed method and the validity of the proposed algorithm has been demonstrated. The in-flight accuracy of the test star tracker has been assessed like attitude noise and low-frequency errors after the precession–nutation correction. | Lai Yuwang Liu Junhong Ding Yonghe Gu Defeng Yi Dongyun | 2014 | Chinese Journal of Aeronautics2014，27，1： | 7 |
| 4 | Minimum critical thickness of dike for ore-bearing fluid injection:A new approach applied to the Shihu gold deposit,Hebei Province,North China显示文摘根据由 transmagmatic 液体(TMF ) 的 metallogenic 理论,一 magmatic 侵入是忍受矿石的液体,然而并非他们的来源的一条隧道。因此,为注射使用 TMF 能力进并且为逃离 magmatic 侵入评估它的形成矿石的潜力是可能的。当当岩浆充分结晶时,忍受矿石的液体不能有效地注入 magmatic 侵入,改变的冷却时间和率粘性能被用来估计侵入的最小的批评厚度。一个维的热转移模型被用来在 Shihu 金存款为不同作文(花岗石斑岩,石英闪长岩和辉绿岩) 的三个代表性的堤决定冷却时间。它也估计率粘性在这些时间间隔变化了。我们作为最小的批评厚度在冷却时间厚度曲线对厚度曲线的交叉拿了堤的厚度。为有效地注入岩浆的忍受矿石的液体,为三个代表性的堤的最小的批评厚度是为花岗石斑岩,为石英闪长岩的 8.22 m 和为辉绿岩的 1.02 m 的 33.45 m,显示忍受矿石的堤一定比每价值厚。这些结果与矿石身体的出现一致,并且因此,他们能在实践被使用。基于在长度和堤的宽度之间的统计关系,这些批评厚度被用来计算批评区域:为辉绿岩,为石英闪长岩的 0.0140.068 km2 和为花岗石斑岩的 0.0110.034 km2 的 0.00030.0016 km2。这暗示忍受矿石的次要的侵入改变了相应于他们的作文的区域。数字模拟提供了忍受矿石的侵入的暴露的厚度和区域的理论阀值。这些价值能被用来决定堤的形成矿石的潜力。 | Dedong Li Yuwang Wang Jingbin Wang Zhaohua Luo Jiulong Zhou Zongfeng Yang Cui Liu | 2012 | Geoscience Frontiers2012，3，5： | 6 |
| 5 | Special Issue on Reconfigurable Robots显示文摘Reconfigurable robots have the characteristics that structures can be changed or reorganized.They can adapt to different environments and tasks through changing configurations or structures,which is a hot research direction in recent years.Existing researches has not yet formed a complete theoretical method system of reconfigurable robots.Therefore,exploring new design theories,key technologies and typical applications is an effective way to promote the rapid development of this field. | Jinguo Liu Yuwang Liu Guangbo Hao | 2020 | Chinese Journal of Mechanical Engineering2020，33，5： | 2 |
| 6 | A new exhalite type—siderite-sericite chert formed in fault-controlled lacustrine basin显示文摘 | Jianming Liu Jie Ye Anli Zhang Yuwang Wang Neng Jiang | 2001 | Science in China Series D: Earth Sciences2001，，12： | 1 |
| 7 | Design and experimental study of a passive power-source-free stiffness-self-adjustable mechanism显示文摘Passive variable stiffness joints have unique advantages over active variable stiffness joints and are currently eliciting increased attention.Existing passive variable stiffness joints rely mainly on sensors and special control algorithms,resulting in a bandwidth-limited response speed of the joint.We propose a new passive power-source-free stiffness-self-adjustable mechanism that can be used as the elbow joint of a robot arm.The new mechanism does not require special stiffness regulating motors or sensors and can realize large-range self-adaptive adjustment of stiffness in a purely mechanical manner.The variable stiffness mechanism can automatically adjust joint stiffness in accordance with the magnitude of the payload,and this adjustment is a successful imitation of the stiffness adjustment characteristics of the human elbow.The response speed is high because sensors and control algorithms are not needed.The variable stiffness principle is explained,and the design of the variable stiffness mechanism is analyzed.A prototype is fabricated,and the associated hardware is set up to validate the analytical stiffness model and design experimentally. | Yuwang LIU Dongqi WANG Shangkui YANG Jinguo LIU Guangbo HAO | 2021 | Frontiers of Mechanical Engineering2021，16，1： | 1 |
| 8 | Design and experiment of a novel pneumatic soft arm based on a deployable origami exoskeleton显示文摘T Soft arms have shown great application potential because of their flexibility and compliance in unstructured environments.However,soft arms made from soft materials exhibit limited cargo-loading capacity,which restricts their ability to manipulate objects.In this research,a novel soft arm was developed by coupling a rigid origami exoskeleton with soft airbags.The joint module of the soft arm was composed of a deployable origami exoskeleton and three soft airbags.The motion and load performance of the soft arm of the eight-joint module was tested.The developed soft arm withstood at least 5 kg of load during extension,contraction,and bending motions;exhibited bistable characteristics in both fully contracted and fully extended states;and achieved a bending angle of more than 240°and a contraction ratio of more than 300%.In addition,the high extension,contraction,bending,and torsional stiffnesses of the soft arm were experimentally demonstrated.A kinematic-based trajectory planning of the soft arm was performed to evaluate its error in repetitive motion.This work will provide new design ideas and methods for flexible manipulation applications of soft arms. | Yuwang LIU Wenping SHI Peng CHEN Yi YU Dongyang ZHANG Dongqi WANG | 2023 | Frontiers of Mechanical Engineering2023，18，4： | 0 |
| 9 | Design and Analysis of a 2-DOF Actuator with Variable Stiffness Based on Leaf Springs显示文摘Variable Stiffness Actuator(VSA)is the core mechanism to achieve physical human–robot interaction,which is an inevitable development trend in robotic.The existing variable stiffness actuators are basically single degree-of-freedom(DOF)rotating joints,which are achieving multi-DOF motion by cascades and resulting in complex robot body structures.In this paper,an integrated 2-DOF actuator with variable stiffness is proposed,which could be used for bionic wrist joints or shoulder joints.The 2-DOF motion is coupling in one universal joint,which is different from the way of single DOF actuators cascade.Based on the 2-DOF orthogonal motion generated by the spherical wrist parallel mechanism,the stiffness could be adjusted by varying the effective length of the springs,which is uniformly distributed in the variable stiffness unit.The variable stiffness principle,the model design,and theoretical analysis of the VSA are discussed in this work.The independence of adjusting the equilibrium position and stiffness of the actuator is validated by experiments.The results show that the measured actuator characteristics are sufficiently matched the theoretical values.In the future,VSA could be used in biped robot or robotic arm,ensuring the safety of human–robot interaction. | ShangKui Yang Peng Chen DongQi Wang Yi Yu YuWang Liu | 2022 | Journal of Bionic Engineering2022，19，5： | 0 |
| 10 | Variable Curvature Modeling Method of Soft Continuum Robots with Constraints显示文摘The inherent compliance of continuum robots holds great promise in the fields of soft manipulation and safe human–robot interaction.This compliance reduces the risk of damage to the manipulated object and its surroundings.However,continuum robots possess theoretically infinite degrees of freedom,and this high flexibility usually leads to complex deformations when subjected to external forces and positional constraints.Describing these complex deformations is the main challenge in modeling continuum robots.In this study,we investigated a novel variable curvature modeling method for continuum robots,considering external forces and positional constraints.The robot configuration curve is described using the developed mechanical model,and then the robot is fitted to the curve.A ten-section continuum robot prototype with a length of 1 m was developed in order to validate the model.The feasibility and accuracy of the model were verified by the ability of the robot to reach target points and track complex trajectories with a load.This work was able to serve as a new perspective for the design analysis and motion control of continuum robots. | Yuwang Liu Wenping Shi Peng Chen Liang Cheng Qing Ding Zhaoyan Deng | 2023 | Chinese Journal of Mechanical Engineering2023，36，6： | 0 |
| 11 | Design and modeling of a novel soft parallel robot driven by endoskeleton pneumatic artificial muscles显示文摘Owing to their inherent great flexibility, good compliance, excellent adaptability, and safe interactivity, soft robots have shown great application potential. The advantages of light weight, high efficiency, non-polluting characteristic, and environmental adaptability provide pneumatic soft robots an important position in the field of soft robots. In this paper, a soft robot with 10 soft modules, comprising three uniformly distributed endoskeleton pneumatic artificial muscles, was developed. The robot can achieve flexible motion in 3D space. A novel kinematic modeling method for variable-curvature soft robots based on the minimum energy method was investigated, which can accurately and efficiently analyze forward and inverse kinematics. Experiments show that the robot can be controlled to move to the desired position based on the proposed model. The prototype and modeling method can provide a new perspective for soft robot design, modeling, and control. | Peng CHEN Tingwen YUAN Yi YU Yuwang LIU | 2022 | Frontiers of Mechanical Engineering2022，17，2： | 0 |
| 12 | Analogy Theory and Application of Pressure Difference of Wind Turbine Blade Profile显示文摘This paper aims to design an optimized blade for Horizontal Axis Wind Turbine(HWAT).Since airfoil is a basic component of blade design,an optimized airfoil(referred as SJX)was proposed based on the line theory through the weight analogy to pressure distribution of air flow.Its lift,drag,lift⁃to⁃drag ratio were compared with those NACA2409⁃34,NACA2410,and RK40 airfoils by using Profili software at fixed wind velocity and under different angles of attack.The NACA2409⁃34 airfoil was found to be greatly similar with the SJX airfoil.Based on the Wilson method,blades using SJX and NACA2490⁃34 airfoils were developed and different performance parameters such as velocity distribution,pressure distribution,and power were compared under variable wind velocities and different angles of attack ranging from-4°to 6°at different radius from the center of rotor using computational fluid dynamics(CFD)in ANSYS FLUENT.Results of the study suggested that the performance of the SJX based airfoil and blade was much more optimized. | Zhaohuang Zhang Aqeel Muhammad Jun Zhang Qing Liu Weiwei Li Yuwang Song | 2020 | Journal of Harbin Institute of Technology(New Series)2020，27，6： | 0 |
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