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高熵形状记忆合金相变行为研究现状

稀有金属材料与工程 2024年第3期53卷 848-855页

作者：赵燕春冯远飞冯力李文生史亚鹏寇生中段望春兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室甘肃兰州730050 兰州理工大学温州泵阀工程研究院浙江温州325105 甘肃省机械工程研究院增材制造与新材料事业部甘肃兰州730000

随着先进工程技术对形状记忆合金性能要求的不断提高,传统形状记忆合金愈发难以满足要求,高熵形状记忆合金应运而生,引起了研究者的极大关注。高熵形状记忆合金相较于传统形状记忆合金具有显著提高的可回复应变、屈服强度、高温物相稳... 详细信息

随着先进工程技术对形状记忆合金性能要求的不断提高,传统形状记忆合金愈发难以满足要求,高熵形状记忆合金应运而生,引起了研究者的极大关注。高熵形状记忆合金相较于传统形状记忆合金具有显著提高的可回复应变、屈服强度、高温物相稳定性和超弹性等特性,具有广阔的应用前景。本文对高熵形状记忆合金的研究现状、马氏体相变和形状记忆效应等进行了简要的论述,并对高熵形状记忆合金目前存在的不足和未来的发展进行了展望。

关键词：高熵形状记忆合金形状记忆效应马氏体相变微观组织结构

A highly ionic conductive succinonitrile-based composite solid electrolyte for lithium metal batteries

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Nano Research 2022年第6期15卷 5153-5160页

作者： Genrui Qiu yapeng shi Bolong Huang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

Solid-state Li metal batteries with solid electrolytes have built a potential way to solve the safety and low energy density problems of current commercial Li-ion batteries with liquid *** a key component of solid-state Li metal batteries,solid electrolytes require high ionic conductivities and good mechanical *** have designed a composite solid electrolyte(CSE)consisting of poly(vinylidene fluoride-hexafluoropropylene)(PVDF-HFP)-Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZTO)-succinonitrile(SN)and Li bis(trifluoromethylsulphonyl)imide(LiTFSI).The PVDF-HFP-based porous matrix made by electrospinning ensures good mechanical properties of the electrolyte membrane,and the large proportion of SN filling material makes the electrolyte membrane have an ionic conductivity of 1.11 mS·cm^(–1)without the addition of liquid *** symmetric battery assembled with CSE can be cycled stably for more than 600 h,and the LiFePO4|CSE|Li full battery can also be cycled stably for more than 200 *** addition to Li metal batteries,Li-O_(2)and Li-CO_(2)batteries that use CSE as electrolytes also have good performances,reflecting the universality of *** does not only guarantee good mechanical properties but also obtain a high ionic *** design provides a new idea for the commercial application of polymer-based solid batteries.

关键词： Li metal batteries composite solid-state electrolyte succinonitrile ionic conductivity mechanical strength

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异质梯度纳米结构金属的研究现状

稀有金属材料与工程 2024年第4期53卷 1195-1206页

作者：赵燕春吕志马虎文史亚鹏毛丰寇生中段望春冯力兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室甘肃兰州730050 兰州理工大学温州泵阀工程研究院浙江温州325105 甘肃省机械工程研究院增材制造与新材料事业部甘肃兰州730000

强度-塑性倒置普遍存在于传统均匀或随机微观结构的金属材料,而梯度纳米结构材料由于其晶粒尺寸呈梯度变化,变形过程中不同特征尺寸的结构相互协调,使其具有优异的综合力学性能。近年来,由不同性质的非均质区域构成异质结构的设计理论... 详细信息

强度-塑性倒置普遍存在于传统均匀或随机微观结构的金属材料,而梯度纳米结构材料由于其晶粒尺寸呈梯度变化,变形过程中不同特征尺寸的结构相互协调,使其具有优异的综合力学性能。近年来,由不同性质的非均质区域构成异质结构的设计理论、制备方法和变形机理逐步完善。本文总结了梯度结构、双峰结构、谐波结构、异质层状结构、分散纳米域和层状纳米孪晶结构等异质结构金属材料的分类及制备方法。结合梯度纳米结构金属在应力加载过程中非均匀塑性变形行为,总结其强塑性机制,包括梯度塑性、几何必须位错、机械驱动的晶粒粗化、表面残余应力和表面扰动和剪切带行为等,并讨论其未来发展所面临的挑战。

关键词：异质结构材料梯度纳米结构力学性能制备方法

A Unified Trajectory Optimization Approach for Long-Term and Reactive Motion Planning of Legged Locomotion

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Journal of Bionic Engineering 2023年第5期20卷 2108-2122页

作者： yapeng shi Bin Yu Kaixian Ba Mantian Li School of Mechanical Engineering Yanshan UniversityNo.438 West Hebei AvenueQinhuangdao066004HebeiPeople’s Republic of China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150001People’s Republic of China

This paper proposes a unified trajectory optimization approach that simultaneously optimizes the trajectory of the center of mass and footholds for legged *** on a generic point-mass model,the approach is formulated as a nonlinear optimization problem,incorporating constraints such as robot kinematics,dynamics,ground reaction forces,obstacles,and target *** unified optimization approach can be applied to both long-term motion planning and the reactive online planning through the use of model predictive control,and it incorporates vector field guidance to converge to the long-term planned *** effectiveness of the approach is demonstrated through simulations and physical experiments,showing its ability to generate a variety of walking and jumping gaits,as well as transitions between them,and to perform reactive walking in obstructed environments.

关键词： Legged locomotion Motion planning Trajectory optimization Bionic robot

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不同产地大红袍花椒香麻味差异分析

经济林研究 2024年第2期42卷 40-53页

作者：张正军姜抢平朱德琴石亚鹏庆阳市林业科学研究所甘肃庆阳745000 陇南市经济林研究院花椒研究所甘肃武都476000

【目的】探究不同产地大红袍花椒香麻味差异,为大红袍花椒综合品质评价提供理论依据。【方法】选择四川汉源、四川茂汶、四川金阳、陕西韩城、陕西凤县、云南昭通、甘肃武都、甘肃庆阳大红袍花椒作为研究对象,以挥发性物质与麻味物质作... 详细信息

【目的】探究不同产地大红袍花椒香麻味差异,为大红袍花椒综合品质评价提供理论依据。【方法】选择四川汉源、四川茂汶、四川金阳、陕西韩城、陕西凤县、云南昭通、甘肃武都、甘肃庆阳大红袍花椒作为研究对象,以挥发性物质与麻味物质作为香麻味指标,采用挥发油提取器、气相色谱-质谱联用仪、高效液相色谱仪进行检测。【结果】8个不同产地大红袍花椒挥发油含量为(17.80±1.30)~(26.20±0.80)mL·kg^(-1),挥发性成分种类为醛类、苯类、烯烃类、酮类、醇类、酸类、烷烃类、酯类,挥发性成分累计检出124种,共有挥发性成分29种,且不同产地大红袍花椒挥发性成分及相对含量存在差异;麻味物质含量为(105.97±0.34)~(156.81±0.44)mg·g^(-1),其中四川汉源的含量最高、甘肃庆阳的含量最低,4种山椒素中羟基-α-山椒素含量最高、羟基-γ-山椒素含量最低,且不同产地麻味物质成分存在差异;(5R)-1-甲基-5-丙-1-烯-2-基环己烯与四川汉源、四川茂汶相关性极显著,羟基-ε-山椒素与陕西韩城、陕西凤县相关性显著;反-2-辛烯醛与甘肃庆阳相关性极显著;经主成分分析,大红袍花椒优劣依次为四川汉源、甘肃武都、四川茂汶、陕西韩城、陕西凤县、四川金阳、云南昭通、甘肃庆阳,且四川金阳、云南昭通、甘肃庆阳产地大红袍花椒香麻味综合品质差异较小。【结论】8个不同产地大红袍花椒香麻味存在一定差异,其优劣依次为四川汉源、甘肃武都、四川茂汶、陕西韩城、陕西凤县、四川金阳、云南昭通、甘肃庆阳,且四川金阳、云南昭通、甘肃庆阳产地大红袍花椒香麻味综合品质差异较小。本研究结果可为食品、医疗卫生等行业原料选择提供依据。

关键词：花椒香麻味挥发性物质麻味物质主成分分析

Force-controlled Compensation Scheme for P-Q Valve-controlled Asymmetric Cylinder used on Hydraulic Quadruped Robots

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Journal of Bionic Engineering 2020年第6期17卷 1139-1151页

作者： yapeng shi Mantian Li Fusheng Zha Lining Sun Wei Guo Cong Ma Zhibin Li State Key Laboratory of Robotics and System Harbin Institue of TechnologyHarbin 150001China Shenzhen Academy of Aerospace Technology China Aerospace ScienceShenzhen 518057China School of Informatics The University of EdinburghEdinburgh EH89ABUnited Kingdom

Under the requirement of the force controller of hydraulic quadruped robots,the goal of this work is to accurately track the force commands at the level of the hydraulic drive *** main contribution focuses on the development of a force-controlled compensation scheme,which is specifically aimed at the key issues affecting the hydraulic quadrupedal *** this idea,based on a P-Q valve-controlled asymmetric cylinder,we first establish a mathematical model for the hydraulic drive unit force control *** the desired force commands,a force feed-forward algorithm is presented to improve the dynamic performance of the ***,we propose a disturbance compensation algorithm to reduce the influence induced by external disturbances due to foot-ground ***,combining with a variable gain PI controller,a series of experiments are implemented on a force control performance test platform to verify the proposed *** results demonstrate that the force-controlled compensation scheme has the ability to notably improve the force tracking accuracy,reduce the response time and redundant force.

关键词： hydraulic drive unit force tracking P-Q valve-controlled asymmetric cylinder hydraulic quadruped robot

Intelligent self-powered sensor based on triboelectric nanogenerator for take-off status monitoring in the sport of triplejumping

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Nano Research 2022年第7期15卷 6483-6489页

作者： Jiahui Xu Xuelian Wei Ruonan Li yapeng shi Yating Peng Zhiyi Wu Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of ScienceBeijing 100049China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

In the era of big data and the Internet of Things,the digital information of athletes is particularly significant in sports ***,an intelligent self-powered take-off board sensor(TBS)based on triboelectric nanogenerator(TENG)with a solid-wooden substrate is provided for precise detection of athletes’take-off status in the sport of triple-jumping,which is sufficient for triplejumping training judgment with a high accuracy of 1 ***,a foul alarm system and a distance between the athlete’s foot and take-off line(GAP)measurement system are further developed to provide take-off data for athletes and *** induced charges are formed by the TBS during taking-off,and then the real-time exercise data is acquired and processed via the test *** work presents a self-powered sports sensor for intelligent sports monitoring and promotes the application of TENG-based sensors in intelligent sports.

关键词： self-powered sports sensor triboelectric nanogenerator triple jump intelligent sports

A self-powered and concealed sensor based on triboelectric nanogenerators for cultural-relic anti-theft systems

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Nano Research 2022年第9期15卷 8435-8441页

作者： Baocheng wang Xiaoying Zhai Xuelian Wei yapeng shi Xiaoqing Huo Ruonan Li Zhiyi Wu Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of ScienceBeijing 100049China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The theft prevention for cultural relics in museums,field excavation sites,and temporary exhibition events is of extreme ***,traditional anti-theft technologies such as infrared monitoring and radio frequency identification are highly costly,power-consuming,and easy to ***,a transparent,ultrathin,and flexible triboelectric sensor(TUFS)with a simple and low-cost method is *** a thickness,weight,and transmittance of 92μm,0.12 g,and 89.4%,the TUFS manifests superb *** from the characteristic of triboelectric nanogenerators,the TUFS responds effectively to common cultural-relic ***,distinguished electrical responses can be obtained even for very small weights(10 g)and areas(1 cm^(2)),proving the sensitivity and wide range of use of the ***,we construct a concealed cultural-relic anti-theft system that enables real-time alarming and accurate positioning of cultural relics,which is expected to strengthen the security level of the existing museum anti-theft systems.

关键词： concealed sensor self-powered triboelectric nanogenerator cultural relic anti-theft

Neural Network Robust Control Based on Computed Torque for Lower Limb Exoskeleton

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao Ma yapeng Wang Di shi Yanggang Feng Xianzhong Li Yanjun shi Xilun Ding Wuxiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(WeiFang)Intelligent Robot Co. Ltd.Beihang UniversityWeifangChina Research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng Aerospace Equipment Co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its control *** Radial Basis Function(RBF)neural network is used widely to compensate for modeling *** order to solve the problem that the current RBF neural network controllers cannot guarantee the asymptotic stability,a neural network robust control algorithm based on computed torque method is proposed in this paper,focusing on trajectory *** innovatively incorporates the robust adaptive term while introducing the RBF neural network term,improving the compensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are consistently less than 1.5°and 2.5°,*** proposed control algorithm effectively compensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model compensation RBF neural network Computed torque method