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A New Flexible Multibody Dynamics Analysis Methodology of Deployable Structures with Scissor-Like Elements

Chinese Journal of Mechanical Engineering 2019年第5期32卷 107-116页

作者： Qi’an Peng Sanmin Wang Changjian Zhi Bo Li School of Mechanical Engineering Northwestern Polytechnical University

There are vast constraint equations in conventional dynamics analysis of deployable structures,which lead to differential-algebraic equations(DAEs)solved *** reduce the difficulty of solving and the amount of equations,a new flexible multibody dynamics analysis methodology of deployable structures with scissor-like elements(SLEs)is ***,a precise model of a flexible bar of SLE is established by the higher order shear deformable beam element based on the absolute nodal coordinate formulation(ANCF),and the master/slave freedom method is used to obtain the dynamics equations of SLEs without constraint ***,according to features of deployable structures,the specification matrix method(SMM)is proposed to eliminate the constraint equations among SLEs in the frame of *** this method,the inner and the boundary nodal coordinates of element characteristic matrices can be separated simply and efficiently,especially on condition that there are vast nodal *** the element characteristic matrices can be added end to end ***,the dynamic model of deployable structure reduces dimension and can be assembled without any constraint ***,a new iteration procedure for the generalized-a algorithm is presented to solve the ordinary differential equations(ODEs)of deployable ***,the proposed methodology is used to analyze the flexible multi-body dynamics of a planar linear array deployable structure based on three scissor-like *** simulation results show that flexibility has a significant influence on the deployment motion of the deployable *** proposed methodology indeed reduce the difficulty of solving and the amount of equations by eliminating redundant degrees of freedom and the constraint equations in scissor-like elements and among scissor-like elements.

关键词： Flexible multibody dynamics Scissor-like elements Absolute nodal coordinate formulation Specification matrix method ordinary differential equations

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Extraordinary Austrian National Dish

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China & The World Cultural Exchange 2020年第12期86卷 44-45页

作者： Wang Juan 不详

Wiener Schnitzel made in various restaurants is quite diflerent in appearance,ingredients,cuisine and ***,what the authentic Wiener Schnitzel?The dish name Wiener Schnitzel das Kalbfleisch first came up in The La test Popular Recipe published in Austria in *** in South Germany,another recipe book popular in the 19th century,applied the dish name Veal Cutlet,which was gradually evolved to the name Wiener Schnitzel in the following ***,the authentic Wiener Schnitzel is made of veal,to be more exact,the tenderloin of calves less than 8 months old.

关键词： Wiener ordinary exact

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Unsteady Squeezing Flow of Jeffery Fluid between Two Parallel Disks

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Chinese Physics Letters 2012年第3期29卷 135-138页

作者： A.Qayyum M.Awais A.Alsaedi T.Hayat Department of Mathematics Quaid-I-Azam University 45320Islamabad 44000Pakistan Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80257Jeddah 21589Saudi Arabia

We investigate an unsteady axisymmetric flow of a Jeffrey fluid between two parallel *** relevant partial differential equations are modeled and simplified by using appropriate *** resulting ordinary differential system is solved and a series solution is *** of various parameters of interest on the flow quantities are *** is found that the velocity profile increases when porosity and squeezing parameters are increased.

关键词： ordinary unsteady flow

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High Bulk Modulus of Nanocrystal γ-Fe2O3 with Chemical Dodecyl Benzene Sulfonic Decoration Under High Pressure

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Chinese Physics Letters 2000年第2期17卷 126-128页

作者： ZHAO Jing GUO Lin LIU Jing YANG Yang CHE Rong-Zheng ZHOU Lei Beijing Synchrotron Radiation Laboratory Institute of High Energy PhysicsChinese Acaderny of SciencesBeijing 100039 Institute of Physics Chinese Academy of SciencesBeijing 100080

Structural transformation in γ-Fe2O3 nanocrystals (about 1Onm) with dodecyl benzene sulfonic (DBS) coated is studied by using high-pressure energy dispersive x-ray diffraction of synchrotron radiation and high-resolution transmission electron microscopy (HRTEM). Relative to the bulk crystal, the transition pressure showed a decrease while the compressibility increases significantly up to 375 (±9 GPa). HRTEM picture confirmed that there is surface cladding surrounding nanocrystals due to DBS, which formed new special boundaries between nanocrystals and should be different from the ordinary grain boundaries. The experimental results imply that the surface layers of γ-Fe2O3 nanocrystals have strong effect on the compressibility.

关键词： crystal ordinary surface

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Ambassador Extraordinary and Plenipotentiary of the People's Republic of China to the Islamic Republic of Pakistan *** Rong

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China's Foreign Trade 2021年第3期 14-15页

The year of 2021 is the 70th anniversary of diplomatic relations between China and *** 70 years,no matter how the international and regional situations change,the two countries have always trusted and supported each *** friendship between China and Pakistan has become an example of friendly relationships for countries with different social systems and historical as well as cultural differences to establish.

关键词： ordinary 国际风云 Republic

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The Extraordinary Decade of China's Import Market——Report on Chinese Imports 2022 Officially Released

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China's Foreign Trade 2022年第6期 12-13页

作者： Wei Hao Business School Beijing Normal University National Import Research Center

Recently,the Report on Chinese Imports 2022 was officially released,which stated that China has steadily held the position of the second largest importer in the world thanks to the dramatical development of China’s import trade in the last *** China International Import Expo (CIIE) fully demonstrates the broadness and the great potential of China’s import market,stimulating participating countries to export more to *** addition to the United States,Japan,Germany and other developed countries,more countries along the Belt and Road,central and eastern European countries,and the least developed countries now actively participate in the CIIE to exhibit their featured prime exports.

关键词： Market ordinary Import

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Zhong Zhaohui:An Extraordinary General Surgeon

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China Today 2022年第7期71卷 58-61页

作者： LI YUAN 不详

Zhong Zhaohui,a general surgeon at the Baitasi branch of Peking University People’s Hospital,is both a witness and promoter to the development of Chinese surgical *** is a building featuring distinctive Victorian architecture style on the bustling Fuchengmennei Street,in downtown *** was the first comprehensive Western medicine hospital financed and operated by Chinese nationals,originally named Cen-tral ***,the 104-year-old building is used as the main building of the Baitasi branch of Peking University People’s *** Zhaohui,a general surgeon at the branch,has worked in this ancient building for 22years,and witnessed the development of Chinese surgical medicine.

关键词： branch ordinary finance

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Mixed Convection Stagnation Point Flow of Casson Fluid with Convective Boundary Conditions

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Chinese Physics Letters 2012年第11期29卷 148-151页

作者： T.Hayat S.A.Shehzad A.Alsaedi M.S.Alhothuali Department of Mathematics Quaid-i-Azam University 45320 Islamabad 44000Pakistan Department of Mathematics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

The mixed convection stagnation-point flow of an incompressible non-Newtonian fluid over a stretching sheet under convective boundary conditions is *** formulation is presented for a Casson *** resulting partial differential equations are converted into the ordinary differential equations by the suitable *** velocity and temperature profiles are computed by employing the homotopy analysis *** plotted graphs illustrate the flow and heat transfer characteristics and their dependence upon the embedded *** values of skin-friction coefficient and Nusselt number are given and *** of the present results with the existing solution is also given.

关键词： method stretching ordinary

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用计算机求常微分方程解析解的若干研究

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厦门大学学报（自然科学版） 1991年第6期30卷 623-625页

作者：蔡晓青蔡经球厦门大学计算机与系统科学系

mμMATH-83是目前在微型机上流行甚广的一种计算机代数系统,它能处理初等数学与高等数学中的一系列符号求解问题。该系统具有相当广泛的求解常微分方程通解之能力,但是它并未提供根据方程的初始条件自动确定通解中之常数的功能。为此,... 详细信息

mμMATH-83是目前在微型机上流行甚广的一种计算机代数系统,它能处理初等数学与高等数学中的一系列符号求解问题。该系统具有相当广泛的求解常微分方程通解之能力,但是它并未提供根据方程的初始条件自动确定通解中之常数的功能。为此,我们在剖析该系统之常微分方程模块的基础上,用mμSIMP语言编制了实现这个功能的程序,使系统可以方便地求解常微分方程的初值问题。

关键词： Computer algebra system ordinary differential equation

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Forward Procedure of Magneto-Acousto-Electric Signal in Radially Stratified Medium of Conductivity for Logging Models

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Chinese Physics Letters 2013年第12期30卷 62-66页

作者： GUO Liang LIU Guo-Qiang XIA Hui CHEN Jing Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100190 College of Control Theory and Engineering China University of PetroleumQingdao 266555

Magneto-acousto-electric tomography(MAET)is known as a method of impedance tomography,with the procedure of acoustic waves propagating in a static magnetic field and producing the electric signal attributing to Lorentz *** analyze the method of calculating the electric signal with given sound sources and magnetic field in the radially stratified medium of *** consists of finding an analytic solution of the sound propagating in homogeneous acoustic medium and applying to the data one of the algorithms(the FD method)for the electric scalar potential *** ideal well logging model is considered in our algorithm,which is very different from the ordinary one in arrangement of the sound sources and electrodes in medical *** the analytical and numerical methods in coupled fields for the well logging model is a stable algorithm in forward procedure of MAET.

关键词： field propagating ordinary

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