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NEW APPROACHES FOR COMPUTING DYNAMIC LOAD-CARRYING CAPACITY OF MULTIPLE COOPERATING ROBOTIC MANIPULATORS

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 67-72页

作者： Yang yulin Lu Ling zhao Yongsheng Zhou yulin Yanshan University Yanshan Univ China

A novel unified method for computing the dynamic load carrying capacity(DLCC) of multiple cooperating robotic manipulators is *** this method,the kinematic constraints and the governing dynamic equations of the multiple robot system are formulated in the joint space by using the method of transference of dependence from one set of generalized coordinates to another,and the virtual work principle,which includes the readily available dynamics and joint torques of individual manipulators,and the dynamic of *** on this dynamic model,the upper limit of the DLCC at any points on a given trajectory is obtained by solving a small size linear programming *** method is conceptually straightforward,and it is applicable also to the cases of multi fingered robot hands and multi legged walking machines.

关键词： Robotic manipulators Cooperating Dynamics Load carrying capacity

Quadratic perturbations of a class of quadratic reversible center of genus one

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Science China Mathematics 2013年第3期56卷 577-596页

作者： LIANG HaiHua WU KuiLin zhao yulin Department of Computer Science Guangdong Polytechnic Normal University College of Science Guizhou University Department of Mathematics Sun Yat-sen University

This paper is concerned with the quadratic perturbations of a one-parameter family of quadratic reversible system, having a center of genus one. The exact upper bound of the number of limit cycles emerging from the pe... 详细信息

关键词： quadratic perturbations quadratic reversible system limit cycle abelian integral

Lithium deposition behavior in hard carbon hosts:Optical microscopy and scanning electron microscopy study

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Nano Research 2023年第6期16卷 8368-8376页

作者： Ge Zhou yulin zhao Chuan Hu Zhenzhen Ren Hong Li Liping Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Tianmu Lake Institute of Advanced Energy Storage Technologies Changzhou 213300China Key Laboratory for Renewable Energy Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Lithium(Li)metal is an ideal anode for the next generation high-energy-density ***,it suffers from dendrite growth,side reactions,and infinite relative volume *** strategies are using porous carbons or surface modification carbons to guide Li deposition into their *** the Li deposition behavior is still ***,we systematically determine their deposition behavior in various surface-modified carbons and in different electrolytes via optical microscopy and scanning electron microscopy *** is found that Li will not spontaneously deposit into the carbon pores,which is significantly dependent on the carbon surface,current density,areal capacity,and ***,a“lithiophilic”modified commercial hard carbon with Ag is developed as a stable“host”and efficient surface protection derived from the localized high-concentration electrolyte exhibits a pretty low volume change(5.3%)during cycling at a current density of 2 mA·cm^(−2)and an areal capacity of 2 mAh·cm^(−2).This strategy addresses the volume change and dendrite problems by rationally designed host and electrolyte,providing a broad perspective for realizing Li-metal anode.

关键词： lithium-metal anode lithium deposition behavior hard carbon host lithiophilic sites localized high-concentration electrolyte

Bottom-up lithium growth guided by Ag concentration gradient in 3D PVDF framework towards stable lithium metal anode

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Journal of Energy Chemistry 2022年第2期31卷 666-673页

作者： yulin zhao Liping Wang Jian Zou Qiwen Ran Li Li Pengyu Chen Hailong Yu Jian Gao Xiaobin Niu School of Materials and Energy University of Electronic Science and Technology of Chin1Chengdu 610054SichuanChina New Energy Materials Laboratory Sichuan Changhong Electric Co.Ltd.Chengdu 610041SichuanChina Key Laboratory for Renewable Energy Chinese Academy of SciencesBeijing Key Laboratory for New Energy Materials and DevicesBeijing 100190China

Three-dimensional(3 D)frameworks have received much attention as an effective modification strategy for next-generation high-energy-density lithium metal ***,the top-growth mode of lithium(Li)on the 3 D framework remains a tough *** achieve a uniform bottom-up Li growth,a scheme involving Ag concentration gradient in 3 D PVDF framework(C-Ag/PVDF)is *** nanoparticles with a concentration gradient induce an interface activity gradient in the 3 D framework,and this gradient feature is still maintained during the *** a result,the C-Ag/PVDF framework delivers a long lifespan over 1800 h at a current density of 1 mA cm^(-2) with a capacity of 1 mAh cm^(-2),and shows an ultra-long life(>1300 h)even at a high current density of 4 mA cm^(-2) with a capacity of 4 mAh cm^(-2).The advantage of concentration gradient provides further insights into the optimal design of the 3 D framework for stable Li metal anode.

关键词： Lithium metal anode 3D framework Bottom-up growth Concentration gradient Ag nanoparticles

Slamming and Green Water Loads on Bow-Flare Ship in Regular Head Waves Investigated by Hydroelasticity Theory and Experiment

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Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 559-570页

作者： JIAO Jialong zhao yulin CHEN Chaohe LI Xiaochen School of Civil Engineering and Transportation South China University of Technology

With the development of ships towards large scale, high speed and light weight, ship hydroelastic responses and slamming strength issues are becoming increasingly important. In this paper, a time-domain nonlinear hydroelasticity theory is developed to predict ship motion and load responses in harsh regular *** restoring force, wave excitation force and radiation force are calculated on the instantaneously wetted body surface to consider the nonlinear effects caused by large amplitude motions of ship in steep waves. A twodimensional(2 D) generalized Wagner model and a one-dimensional(1 D) dam-breaking model are used to estimate the impact loads caused by bow flare slamming and green water on deck, respectively;the impact loads are coupled with the hydroelastic equation in time-domain. Moreover, segmented model tests are carried out in a towing tank to investigate the wave and slamming loads acting on the hull sailing in harsh regular head waves and also validate the numerical results.

关键词： hydroelasticity theory wave load slamming load green water on deck segmented model test

Field programmable topological edge array

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Photonics Research 2023年第3期11卷 476-484页

作者： XIAOXIAN HE XIANGRU WANG yulin zhao RUSHENG ZHUO FENG LIANG School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Valley Hall topological photonic crystals,inspired by topological insulators in condensed matter physics,have provided a promising solution to control the flow of ***,the dynamic manipulation property of topological photonic crystals has been widely ***,we propose a novel solution for programmable valley photonic crystals,called field programmable topological edge array(FPTEA),based on the field reorientation property of nematic liquid crystals and robust valley-protected edge *** is composed of an array of graphene-like lattices with C_(3)symmetry,in which the birefringence of liquid crystal is larger than *** to the dielectric anisotropy of liquid crystals being sensitive to external fields such as light,heat,electric,and magnetic fields,each lattice is tunable,and the topological propagation routes and even the lattice parameters can be dynamically changed while changing the distribution of external *** numerically demonstrate three methods of composing an FPTEA device to design arbitrary passive optical devices by electric driving,thermal inducing,or UV *** results show the great application potential of liquid crystals in topological photonic crystals,and enrich the design of programmable integrated topological devices with broad working bandwidth ranging from microwave to visible light.

关键词： topological property symmetry

PERTURBATIONS OF A KIND OF DEGENERATE QUADRATIC HAMILTONIAN SYSTEM WITH SADDLE-LOOP

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Chinese Annals of Mathematics,Series B 2002年第1期23卷 85-94页

作者： zhao yulin,WU XIAOMING,ZHU SIMING Department of Mathematics. Zhongshan University, Guangzhou 510275. China. E-mail: mcszyl@*** Department of Mathematics Zhongshan University Guangzhou 510275 China

The authors investigate a kind of degenerate quadratic Hamiltonian systems with saddle-loop. Under quadratic perturbations, it is proved that the perturbed system has at most two limit cycles in the finite plane. The ... 详细信息

关键词： Limit cycles Quadratic systems Abelian integrals

New Progress of Power Electronic On-Load Tap Changing Distributing Transformer

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Journal of Northeast Agricultural University(English Edition) 2009年第1期16卷 64-68页

作者： ZHANG Pinxiu zhao yulin Engineering College Northeast Agricultural University Harbin 150030 China Informtion Technology Institute Heilongjiang August First Land Reclamation University Daqing 169319 Heilongjiang China

At present, the widely applied mechanical on-load tap-changer is not suitable for the 10 kV power distribution network. Along with the development of power electronic technology, there has the report on on-load tap changing （OLTC） distributing transformer based on the power electronic technology. In this paper, the analysis on the characteristic of several kinds of non-contacts OLTC distributing transformer was carried on. The result indicates that OLTC distributing transformer based on the solid state relay has the broad applied prospect in the 10 kV medium distribution network.

关键词： powers electronics non-contact OLTC transformer SSR

The Actuality and Development Trend of Var Compensation for Distribution System

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Journal of Northeast Agricultural University(English Edition) 2008年第4期15卷 88-91页

作者： LIANG Qiuyan zhao yulin Engineering College Northeast Agricultural University Harbin 150030 China

Effective reactive power compensation is very important to the safe,economical and high quality running of power *** principle and characteristic of several main reactive power compensation devices were analyzed and c... 详细信息

关键词： reactive power reactive power compensation STATCOM