中国科学院机构知识库网格系统: 检索

Development of a variable-porosity metal-foam model for the next fuel cells flow-distributors 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2022, 卷号: 47, 期号: 7, 页码: 4772-4792
作者: Kermani, M. J.; Moein-Jahromi, M.; Hasheminasab, M. R.; Wei, L.; Guo, J.

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收藏 | 浏览/下载：11/0 | 提交时间：2023/11/21

Variable-porosity model Functionally graded porous material (FGPM) Metal foam Volumetric-power-density Streamlines customization Uniform velocity distribution

Variable-gain control for continuum robots based on velocity sensitivity 期刊论文 OAI收割
Mechanism and Machine Theory, 2022, 卷号: 168, 页码: 1-17
作者: Zhang, Xu; Liu, Yue; Branson, David T.; Yang CH(杨铖浩); Dai JS(戴建生)

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收藏 | 浏览/下载：59/0 | 提交时间：2021/11/18

Continuum robot Kinematic model Variable gain control Velocity sensitivity

Improved formulae of velocity distributions along the vertical and transverse directions in natural rivers with the sidewall effect 期刊论文 OAI收割
ENVIRONMENTAL FLUID MECHANICS, 2018, 卷号: 18, 期号: 6, 页码: 1491-1508
作者: Jinyou Lu; Yinjun Zhou; Yonghui Zhu; Junqiang Xia; Li Wei

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收藏 | 浏览/下载：35/0 | 提交时间：2018/12/17

Definite solution problem Method of variable separation Velocity distribution formula Narrow-deep rivers Sidewall effect

Laboratory observations of transient frictional slip in rock-analog materials at co-seismic slip rates and rapid changes in normal stress 期刊论文 OAI收割
TECTONOPHYSICS, 2012, 卷号: 558, 页码: 58-69
作者: Yuan FP(袁福平); Prakash V

收藏 | 浏览/下载：30/0 | 提交时间：2013/01/18

Rock-analog materials Co-seismic slip rates Rate weakening and strengthening Flash heating Rapid change in normal stress Plate-impact pressure-shear friction experiments Velocity-Dependent Friction Variable Normal Stress Molten-Metal Films Dynamic Rupture Constitutive-Equations Earthquake Prediction Sliding Conditions Melt Lubrication Fault Gouge Behavior

Structure buckling load interval analysis of supercavitating projectile (EI CONFERENCE) 会议论文 OAI收割
2011 9th International Conference on Reliability, Maintainability and Safety: Safety First, Reliability Primary, ICRMS'2011, June 12, 2011 - June 15, 2011, Guiyang, China
作者: Zhou L.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

As a result of supercavitating projectiles with high underwater velocity their structures undergo high longitudinal force. It is necessary to perform structure buckling load interval analysis because the uncertainty of structural own parameters should be considered. Critical buckling load of supercavitating projectiles is calculated by Galerkin method. The partial matrixes of critical buckling load implicit function to each uncertainty variable are deduced and the interval of structure critical buckling load is calculated by interval analysis and convex model methods. Numerical results show that the nominal value lower and upper bounds of critical buckling load increase with the increment of the ratio of base diameter to cavitator diameter. And the uncertainty degree of basic variables should be controlled as far as possible in the project for high reliability. 2011 IEEE.

Structure buckling reliability analysis of supercavitating projectile (EI CONFERENCE) 会议论文 OAI收割
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
作者: Zhou L.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

Because the underwater velocity of supercavitating projectile is very high its structure undergo high longitudinal force. It is necessary to perform structure buckling reliability analysis because the randomicity of structural own parameters and flow parameters should be considered. Critical buckling load of supercavitating projectile is calculated by Galerkin method. The partial matrixes of critical buckling load implicit function to each random variable are deduced and structural buckling reliability index is calculated by limit step length iteration method. Numerical results show that the critical buckling load and structural buckling reliability index increase with the increase of the ratio of base diameter to cavitator diameter. And structural buckling reliability index increase with the decrease of velocity coefficient. 2011 IEEE.

Research on model reference sliding mode control in roll stabilization of aerocraft (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Chu H.-R.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

Aimed at aerospace roll stabilization control arithmetic based on model reference sliding mode variable structure theory and chattering reduction arithmetic are formulated. Correctness and validity of arithmetic are analyzed. With flight dynamics the roll-loop mathematic model and reference model are established. Sliding hyperplane is deduced based on model reference sliding mode variable structure theory. Combing with reaching law control law is derived and stability of roll-loop is analyzed. Chattering of aileron instructions is alleviate by using boundary layer approach. Digital flying simulation result shows that variable structure control arithmetic realized roll stabilization control the roll angle is less than 5.3 under powered flight and that of unpowered flight is less than 0.5 respectively. The command fin angle is less than 1.5. High frequency chattering of fin command nearby the minimum velocity was trailed off by chattering reduction arithmetic. The sliding mode control arithmetic show good performance when aerodynamic coefficients varies 20%. The control arithmetic is easy to be implemented for its simplicity. 2011 IEEE.

Dynamic behaviors of mode III interfacial crack under a constant loading rate 期刊论文 OAI收割
Continuum Mechanics and Thermodynamics, 2010, 卷号: 22, 期号: 6-8, 页码: 515-530
作者: Chen SH(陈少华); Gao HJ(高华健); Chen SH

收藏 | 浏览/下载：29/0 | 提交时间：2011/03/01

Mode Iii Interfacial Crack Constant Loading Rate Subsonic Supersonic Daughter Crack Simulating Materials Failure Worlds Fastest Computer Intersonic Shear Cracks One Billion Atoms Bimaterial Interface Transient Analysis Variable Velocity Homogeneous Media Transition Waves Phase-Transition

Consistent projection methods for variable density incompressible navier-stokes equations with continuous surface forces on a rectangular collocated mesh 期刊论文 iSwitch采集
Journal of computational physics, 2009, 卷号: 228, 期号: 18, 页码: 6938-6956
作者: Ni, Ming-Jiu

收藏 | 浏览/下载：76/0 | 提交时间：2019/05/10

Consistent projection method Divergence-free velocity Variable density navier-stokes equations Surface tension Pressure gradient

Dynamics simulation on control technology for 4WS vehicle steering performance (EI CONFERENCE) 会议论文 OAI收割
ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China
Rong-Hui Z.; Hong-Guang J.; Tao C.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

By combining visual preview kinematics dynamic equation of steering system and 2-DOF steering dynamistic model of 4WS it can easily attenuate the change and uncertainty of model. 2008 IEEE. we establish the two degree of freedom model of four-wheel steering vehicle. And then the switching hyper plane is designed by applying the optimal control theory. During the change of parameter is little 4WS steering performance is carried out by adopting sliding variable structure controller. To improve the steering performance of 4WS especially state variables convergent velocity Kalman filter for 4WS is designed. And the robust optimal controller is designed for model and parameter is uncertainty. The simulation results show that the controller designed by the proposed method has good robustness