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弹性打纬系统弹性节机构的参数优化
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作者 周井玲 刘延山 +1 位作者 曹清林 徐山青 《南通工学院学报》 1998年第2期24-28,共5页
本文以织机打纬力为恒值作为优化目标,对设计出的弹性打纬系统中弹性节机构参数进行了优化,得到了机构尺寸和弹簧特征参数的优化结果.
关键词 打纬机构 弹性打纬系统 纺织机构 弹性节机构
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弹性节的优化设计
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作者 周井玲 刘延山 《江苏理工大学学报(自然科学版)》 1999年第1期48-51,共4页
在静力学的基础上,以打纬力为恒值作为优化目标,优化了弹性打纬系统中弹性节的参数。
关键词 打纬机构 弹性打纬 弹性节 优化设计
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弹性轴节的成形工艺与成形模设计 被引量:2
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作者 谢永峰 《模具工业》 2016年第8期19-22,共4页
介绍了弹性轴节的成形工艺与成形模结构,结合零件材料特性、力学性能及零件的圆度、同轴度公差尺寸要求,通过制订合理的成形工艺,设计了相应的模具结构,经生产验证,成形的零件满足设计要求,提高了零件的生产质量和生产效率。
关键词 弹性 成形工艺 模具
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Analysis on the Economical and Intensive Utilization of Regional Construction Land in Zunyi City of Guizhou Province
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作者 兰安军 王昌浩 +1 位作者 钟九生 秦微 《Agricultural Science & Technology》 CAS 2017年第6期1133-1137,共5页
Taking Zunyi City of Guizhou Province as research area, the research performed spatial dynamic analysis and elastic coefficient method to evaluate the e- conomical and intensive utilization of the regional constructio... Taking Zunyi City of Guizhou Province as research area, the research performed spatial dynamic analysis and elastic coefficient method to evaluate the e- conomical and intensive utilization of the regional construction land, and to discuss the decision direction for economical and intensive utilization of the regional con- struction land. The results showed that, the population based land utilization both in Zunyi and the city districts and counties indicated extensive trend. The economy- based land utilization in Zunyi City, as well as in Huichun, Zunyi and Tongzi County presented intensive trend, however the other districts and counties were in extensive tendency. It concluded that the economical and intensive utilization of construction land should be focused on the rural collective construction land, and the potential tapping of rural collective construction land in rocky desertification area should be the first priority, otherwise, the regional economic development was unbalanced be- tween different district and county in Zunyi. 展开更多
关键词 Economical and intensive utilization Elastic coefficient Spatial dynamicanalysis Zunyi City
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Numerical Analysis on Displacement Law of Discontinuous Rock Mass in Broken Rock Zone for Deep Roadways 被引量:5
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作者 靖洪文 许国安 马世志 《Journal of China University of Mining and Technology》 2001年第2期132-137,共6页
On the basis of the characteristics of broken rock zone, using the program of "discontinuous deformation analysis(DDA)", the changing law of influential factors of discontinuous rock mass in large broken roc... On the basis of the characteristics of broken rock zone, using the program of "discontinuous deformation analysis(DDA)", the changing law of influential factors of discontinuous rock mass in large broken rock zone was researched quantitatively for the first time. Based on the results of computation, the concept of "key part"of roadways and its stability criterion were brought forward, and it was pointed out that in inclined coal and rock seams the"key parts"of roadways are the upper side and the floor of surrounding rocks, especially the former. 展开更多
关键词 deep mining discontinuous rock mass broken rock zone DISPLACEMENT
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Motion estimation of elastic articulated objects from image contours
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作者 潘海朗 戴跃伟 石磊 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第3期326-330,共5页
A new method of elastic articulated objects (human bodies) modeling was presented based on a new conic curve. The model includes 3D object deformable curves which can represent the deformation of human occluding conto... A new method of elastic articulated objects (human bodies) modeling was presented based on a new conic curve. The model includes 3D object deformable curves which can represent the deformation of human occluding contours. The deformation of human occluding contour can be represented by adjusting only four deformation parameters for each limb. Then, the 3D deformation parameters are determined by corresponding 2D contours from a sequence of stereo images. The algorithm presented in this paper includes deformable conic curve parameters determination and the plane, 3D conic curve lying on, parameter determination. 展开更多
关键词 elastic articulated object human body modeling motion estimation
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Effects of wheelset vibration on initiation and evolution of rail short-pitch corrugation 被引量:6
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作者 闫子权 谷爱军 +2 位作者 刘维宁 V.L.Markine 梁青槐 《Journal of Central South University》 SCIE EI CAS 2012年第9期2681-2688,共8页
The initiation and evolution of short-pitch corrugation in Beijing metro line 4 was studied from the viewpoint of wheelset vibration.A three-dimensional elastic model was set up.Numerical simulations were undertaken w... The initiation and evolution of short-pitch corrugation in Beijing metro line 4 was studied from the viewpoint of wheelset vibration.A three-dimensional elastic model was set up.Numerical simulations were undertaken with this model to analyze the corrugation by the wheelset vertical vibration and torsional vibration.Based on numerical results,the relation between rail corrugation and wheelset vibration,and the relation between the position of electromotor and wheelset vibration were indicated.It is found that avoiding the wheelset-rail resonance is one method of controlling the rail short-pitch corrugation and solving the vibration and noise problem in metro lines. 展开更多
关键词 rail corrugation wheelset vertical vibration wheelset torsional vibration finite element modeling
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Equivalent elastic compliance tensor for rock mass with multiple persistent joint sets:Exact derivation via modified crack tensor 被引量:1
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作者 崔洁 江权 +3 位作者 冯夏庭 李邵军 高红 李帅军 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第6期1486-1507,共22页
Discontinuities constitute an integral part of rock mass and inherently affect its anisotropic deformation behavior.This work focuses on the equivalent elastic deformation of rock mass with multiple persistent joint s... Discontinuities constitute an integral part of rock mass and inherently affect its anisotropic deformation behavior.This work focuses on the equivalent elastic deformation of rock mass with multiple persistent joint sets.A new method based on the space geometric and mechanical properties of the modified crack tensor is proposed,providing an analytical solution for the equivalent elastic compliance tensor of rock mass.A series of experiments validate the capability of the compliance tensor to accurately represent the deformation of rock mass with multiple persistent joint sets,based on conditions set by the basic hypothesis.The spatially varying rules of the equivalent elastic parameters of rock mass with a single joint set are analyzed to reveal the universal law of the stratified rock mass. 展开更多
关键词 equivalent elastic compliance tensor crack tensor multiple joint sets rock mass
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Comparison of Node Architectures for Elastic Optical Networks with Waveband Conversion 被引量:1
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作者 张平 李巨浩 +3 位作者 郭秉礼 何永琪 陈章渊 邬贺铨 《China Communications》 SCIE CSCD 2013年第8期77-87,共11页
In Elastic Optical Networks(EONs)with flexible bandwidth allocation,the blocking probability is high because of spectral contention.Similar to the functionality of wavelength conversion in Wavelength-Division-Multiple... In Elastic Optical Networks(EONs)with flexible bandwidth allocation,the blocking probability is high because of spectral contention.Similar to the functionality of wavelength conversion in Wavelength-Division-Multiplexing(WDM)networks,waveband conversion has been proposed to solve spectral contention in EONs.In this paper,we discuss the design of node architectures for an EON with waveband conversion.Four node architectures with shared Tuneable Waveband Converters(TWBCs)are proposed,and their blocking performances are evaluated by simulation.Simulation results show that the blocking probability of a node is significantly improved by waveband conversion.The sharing efficiency of waveband converters is also investigated.Simulation results show that at the same blocking rate,the node architecture with converters shared per node can save more than 20% waveband converters compared with that of the one with converters shared per link. 展开更多
关键词 EON TWBC node architecture blocking probability
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Application Study on Elastomer Expansion Joint in Heavy Haul Railway
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作者 Leran Wang Bin Niu Yonghua Su 《Journal of Civil Engineering and Architecture》 2015年第9期1047-1053,共7页
The article summarizes related research results and achievements of elastomer expansion device in railway bridge and puts forward a new idea of using polyurethane elastomer material to seal concrete bridge joints betw... The article summarizes related research results and achievements of elastomer expansion device in railway bridge and puts forward a new idea of using polyurethane elastomer material to seal concrete bridge joints between adjacent spans in heavy haul railways. The new type expansion device is composed of polyurethane elastomer material and named TTXF (elastomer expansion joint). In theory, researchers find out expansion joint deformation regularity between adjacent bridge spans through theoretical analysis and detection in heavy haul railways, such as Datong-Qinhuangdao Railway and Shenchi-Huanghua Port Railway. Fatigue tests prove that TTXF can adapt to permanent and dynamic deformation. On the other hand, it has been successfully applied in the test section of Central South of Shanxi Railway Passage and continuous monitoring has been conducted in extreme weather for over one year. The expansion joint has a good effect practically. 展开更多
关键词 Heavy haul railway BRIDGE ELASTOMER expansion joint
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Relationship between triphasic mechanical properties of articular cartilage and osteoarthritic grade 被引量:3
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作者 NIU HaiJun LIU ChengRui +4 位作者 LIAng WANG Qing WANG YueXiang LI DeYu FAN YuBo 《Science China(Life Sciences)》 SCIE CAS 2012年第5期444-451,共8页
The purpose of this study was to explore the triphasic mechanical properties of osteoarthritic cartilage with different pathological grades.First,samples of cartilage from rabbits with different stages of osteoarthrit... The purpose of this study was to explore the triphasic mechanical properties of osteoarthritic cartilage with different pathological grades.First,samples of cartilage from rabbits with different stages of osteoarthritis (OA) were graded.Following this,the cartilage was strained by a swelling experiment,and changes were measured using a high-frequency ultrasound system.The result,together with fixed charge density and water volume fraction of cartilage samples,was used to estimate the uniaxial modulus of the cartilage tissue,based on a triphasic model.For the control cartilage samples,the uniaxial elastic modulus on the cartilage surface was lower than those in the middle and deep layers.With an increase in the OA grade,the uniaxial elastic modulus of the surface,middle and deep layers decreased.A significant difference was found in the surface elastic modulus of different OA grades (P<0.01),while no significant differences were identified for OA cartilages of Grades 1 and 2 in the middle and deep layers (P<0.01).Compared with Grades 1 and 2,there was a significant reduction in the elastic modulus in the middle and deep layers of Grade 3 OA cartilage (P<0.05).Overall,this study may provide a new quantitative method to evaluate the severity of OA using the mechanical properties of cartilage tissue. 展开更多
关键词 osteoarthritis grade triphasic theory ultrasound uniaxial modulus
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Three dimensional efficient meshfree simulation of large deformation failure evolution in soil medium 被引量:4
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作者 WANG DongDong LI ZhuoYa +1 位作者 LI Ling WU YouCai 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第3期573-580,共8页
An efficient Galerkin meshfree formulation for three dimensional simulation of large deformation failure evolution in soils is presented. This formulation utilizes the stabilized conforming nodal integration, where fo... An efficient Galerkin meshfree formulation for three dimensional simulation of large deformation failure evolution in soils is presented. This formulation utilizes the stabilized conforming nodal integration, where for the purpose of stability and efficiency a Lagrangian smoothing strain at nodal point is constructed and thereafter the internal energy is evaluated nodally. This formulation ensures the linear exactness, efficiency and spatial stability in a unified manner and it makes the conventional Galerkin meshfree method affordable for three dimensional simulation. The three dimensional implementation of stabilized conforming nodal integration is discussed in details. To model the failure evolution in soil medium a coupled elasto-plastic damage model is used and an objective stress integration algorithm in combination of elasto-damage predictor and plastic corrector method is employed for stress update. Two typical numerical examples are shown to demonstrate the effectiveness of the present method for modeling large deformation soil failure. 展开更多
关键词 meshfree method three dimensions stabilized conforming nodal integration failure evolution large deformation
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On-chip higher-order topological micromechanical metamaterials 被引量:4
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作者 Ying Wu Mou Yan +3 位作者 Zhi-Kang Lin Hai-Xiao Wang Feng Li Jian-Hua Jiang 《Science Bulletin》 SCIE EI CSCD 2021年第19期1959-1966,M0003,共9页
Metamaterials with higher-order topological band gaps that exhibit topological physics beyond the bulkedge correspondence provide unique application values due to their ability of integrating topological boundary stat... Metamaterials with higher-order topological band gaps that exhibit topological physics beyond the bulkedge correspondence provide unique application values due to their ability of integrating topological boundary states at multiple dimensions in a single chip.On the other hand,in the past decade,micromechanical metamaterials are developing rapidly for various applications such as micro-piezoelectricgenerators,intelligent micro-systems,on-chip sensing and self-powered micro-systems.To empower these cutting-edge applications with topological manipulations of elastic waves,higher-order topological mechanical systems working at high frequencies(MHz)with high quality-factors are demanded.The current realizations of higher-order topological mechanical systems,however,are still limited to systems with large scales(centimetres)and low frequencies(k Hz).Here,we report the first experimental realization of an on-chip micromechanical metamaterial as the higher-order topological insulator for elastic waves at MHz.The higher-order topological phononic band gap is induced by the band inversion at the Brillouin zone corner which is achieved by configuring the orientations of the elliptic pillars etched on the silicon chip.With consistent experiments,theory and simulations,we demonstrate the emergence of coexisting topological edge and corner states in a single silicon chip as induced by the higher-order band topology.The experimental realization of on-chip micromechanical metamaterials with higherorder topology opens a new regime for materials and applications based on topological elastic waves. 展开更多
关键词 Higher-order band topology Micromechanical metamaterials On-chip devices Mechanical waves
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Deployment simulation of cable-strut structures considering cable sliding 被引量:2
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作者 CAI JianGuo FENG Jian WANG Kai 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第12期3263-3269,共7页
The influence of cable sliding on the deployment of foldable cable-strut structures was studied in this paper. In order to develop an effective program for the cable sliding program, two-node cable element based on th... The influence of cable sliding on the deployment of foldable cable-strut structures was studied in this paper. In order to develop an effective program for the cable sliding program, two-node cable element based on the analytical solution of elastic cate- nary was studied. Then the cable sliding stiffness was defined as the ratio of the variation of the cable force to the variation of the cable length. To validate the proposed numerical method, analyses of two examples given in references were carried out. The results show that the method given in this paper is accurate and effective, which can be used to model the cable sliding in cable structures. Finally, the deployment process of a foldable cable-strut structure, which is composed of four-bar linkages and cables, was discussed. It can be found that the effect of cable sliding on the behavior of cable-strut structures is significant. The length changes of active cables are smaller when the cable sliding is considered. Moreover, the nodal coordinate changes also become faster when the numerical model is with cable sliding. 展开更多
关键词 DEPLOYMENT elastic catenary cable-strut structures cable sliding nonlinear analysis
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