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Dimension and Laminates Optimization of CFRP Panel Using Multi-objective GA

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Dimension and Laminates Optimization of CFRP Panel Using Mul...

The Fourth China-Japan-Korea Joint symposium on Optimization of Structural and mechanical Systems

作者： Akira Todoroki Masato Sekishiro dept.of mechanical Sciences and eng. Meguro Tokyo Institute of Technology1528552TokyoJapan Graduated student of Tokyo Institute of Technology

＜正＞The present paper demonstrates a new low-cost optimization method for the optimal design of the laminated composite panels with stiffeners. For the optimal design of composite laminated panels with stiffeners, both stacking sequence optimization and structural optimization, such as dimension optimization, are indispensable. Authors have proposed a practical stacking sequence optimization method: fractal branch and bound method （FBB）. In the present paper, in order to make the FBB method applicable to the optimizations of both stacking sequences and dimension of composite laminated structures, a new low-cost optimization method using Kriging method using multi-objective GA is proposed. To examine the validity of the proposed method, the method is applied to the minimum weight design of stiffened composite panels. The result indicates that the method provides valuable solutions with good precision and a low computational cost.

关键词： Optimization Composite Structure Kriging Method Multi-objective GA

Deformation Analysis of MEMS using High Density Grating Measurement Techniques

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Deformation Analysis of MEMS using High Density Grating Meas...

第三届二十一世纪的实验力学学科发展——海峡两岸实验力学研讨会

作者：谢惠民 AFML Dept.of Eng.MechanicsTsinghua University dept.of mechanics School of AstronauticsBeijing Institute of Technology

Rapid development of microfabrication technologies has produced a wide variety of microelectromechanical systems(MEMS).The mechanical performances of those microdevices are normally related to deformation and movement of the structures under *** quantitative analysis of the structures deformation is very important for design and functional control of the microsystems.

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Modeling and simulation of capacitance weighing system

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Journal of Measurement Science and Instrumentation 2012年第2期3卷 109-111页

作者：赵纲领张宁杨三序 Shanghai Institute of applied Mathematics and mechanics Shanghai University Shanghai 200072 China dept. of Physics and Electrical Information Shangqiu Normal University Shangqiu 476000 China

In some cases necessary to weigh vehicles,an electromechanical weighing system has been developed,which consists of automobile leaf springs,capacitance sensors together with measuring circuits and other major *** increase the modeling accuracy,it is necessary to consider not only mechanical freedom,but also the electrical *** this paper,the dynamic model based on the Lagrange-Maxwell equation is *** results and test data show that the modeling is feasible and *** feature of the system is that it can provide static and dynamic measurements.

关键词： modeling capacitance weighting system electromechanical Lagrange-Maxwell simulation

维普期刊数据库

PROPAGATION OF NONLINEAR LOGITUDINAL WAVES IN AN ELASTIC ROD

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PROPAGATION OF NONLINEAR LOGITUDINAL WAVES IN AN ELASTIC ROD

2012全国压电和声波理论及器件技术研讨会

作者： Rong-xing WU Lan-zhen YU Wei SHI Jing YU Ji WANG Department of Architectural eng.neering Ningbo Polytechnic Piezoelectric Device Laboratory School of Mechanical Eng.& MechanicsNingbo University

The nonlinear longitudinal wave propagation in a rod is studied by the homotopy analysis method and obtained analytical solutions which are the same as earlier known *** also employed the explicit and implicit finite difference methods to solve this nonlinear equation,*** numerical results showed the wave form depends on many factors such as driving frequency,amphtude,nonlinear elastic constant,and wave *** found that compared with the explicit finite difference method,the implicit finite difference method need less amount of the grid but require more computational time to obtain rehable *** also found out that the energy of multiple-frequency components becomes larger with longer traveling distance.

关键词： Nonlinear Longitudinal wave Homotopy analysis method Finite difference method

The Boundary Layer Flows of a Rivlin-Ericksen Fluid

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The Boundary Layer Flows of a Rivlin-Ericksen Fluid

The Fifth International Conference on Fluid mechanics

作者： K.Sadeghy N.Khabazi S.M.Taghavi University of Tehran Department of mechanical Eng.North Kargar St.Jalale aleahmad Blvd.TehranIran

＜正＞The present work deals with the two-dimensional incompressible,laminar,steady-state boundary layer ***,we determine a family of velocity distributions outside the boundary layer such that these problems may have similarity *** study the Falkner-Skan flow of a viscoelastic fluid governed by second order model,as the Reynolds number Re→∞.We obtain an ordinary forth order differential equation to obtain the stream function,velocity profile and the *** stream function is then governed by a generalized Falkner-Skan *** comparison with Newtonian Falkner-Skan equation that has two coefficients this new one has four coefficients that two of them represent elastic properties of the *** effects of the elastic parameter on the velocity filed have been *** it is shown in the figure there is a good agreement between numerical results and previous special cases confirm the validity of the presented algorithm.

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ON CRACK PROPAGATION IN A COUPLED THERMO-mechanical SYSTEM OF NONLINEAR MEDIA

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applied Mathematics and mechanics(eng.ish Edition) 1983年第3期4卷 329-338页

作者：欧阳鬯 dept. of Mathematics China Fudan University Shanghai

In some eng.neering ***-mechanical coupling is im-portant and may not be *** paper deals With the crackpropagation problem in a coupled thermo-mechanical system of non-linear *** nonlinear *** nonlinear e-lastic and elastic-plastic cases,have been considered and therelated path-independent integrals are *** explain thephysical meaning of these integrals,a notched specimen hasbeen *** the dynamical crack extension force in acoupled thermo-mechanical system is shown to be equal to *** could consider such integrals as some non-linear criteria for coupled thermo-mechanical fracture dynamics.

关键词： ON CRACK PROPAGATION IN A COUPLED THERMO-mechanical SYSTEM OF NONLINEAR MEDIA

THE DIFFERENTIAL GEOMETRIC PRINCIPLE OF THE NONHOLONOMIC mechanical SYSTEMS OF CHETAEV’S TYPE

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applied Mathematics and mechanics(eng.ish Edition) 1986年第9期7卷 903-918页

作者：赵世鹰 dept. Math. & Mech. Shanghai Tongji University

This paper deals with the nonholonomic mechanical systems of Chetaev ’s type by useof modern differential geometric methods. Based on a precise definition of Chetaev-typeconstraint pfaffian systems, the differential geometric structure is given for the descriptionof nonholonomic mechanical *** this framwork,the classical theory of Lagrange’sequations with nonholonomic constraints is put into an invariant and coordinate free ***, the problems of constraint imbedding and conservation laws are discussedwithin this *** the Noether-type thereom on constraint-imbedding submanifoldsis obtained

关键词： S TYPE THE DIFFERENTIAL GEOMETRIC PRINCIPLE OF THE NONHOLONOMIC mechanical SYSTEMS OF CHETAEV

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固粒击靶的有效摩擦系数

工程力学 2004年第5期21卷 172-177页

作者：陈大年 S.T.S.Al-Hassani 陈建平俞宇颖尹志华宁波大学力学与材料科学研究中心浙江315211 dept.of mechanical eng.UMIST Manchester M60IQDU.K.

定义一种固粒击靶的有效冲击摩擦系数为粘着项与犁沟项的组合,其中包含表征剪切金属结合点的状态滑动或滚动的状态参数以及表征冲击物在击靶过程中产生犁沟效应的状态参数。研究表明,对于硬钢球斜冲击软钢靶情况,在连续滑移的情况下,只... 详细信息

定义一种固粒击靶的有效冲击摩擦系数为粘着项与犁沟项的组合,其中包含表征剪切金属结合点的状态滑动或滚动的状态参数以及表征冲击物在击靶过程中产生犁沟效应的状态参数。研究表明,对于硬钢球斜冲击软钢靶情况,在连续滑移的情况下,只有在计及接触斑点的微粒间的相互作用的一定条件下,粘着项的值才可能接近0.05,这是Hutchings为使一系列数值计算的钢球反弹速度及角度与实验结果一致,在所有计算中所取的调节参数“摩擦系数”值。然而,研究表明,对于著名的Hutchings实验,如果连续犁沟发生,犁沟项则是冲击过程及初始冲击角的函数,就过程平均而言,其值大于0.05。由此,可认为,冲击过程中可滑移界面瞬间的滑移、滚动及犁沟状态的转化使Hutchings实验中的“摩擦系数”约为0.05;一般而言,这些状态的转化使固粒击靶的有效摩擦系数的过程平均值远小于低速简单滑移的摩擦系数。

关键词：固粒击靶有效摩擦系数剪切项滑移或滚动犁沟项

维普期刊数据库

Determination of relationship between Rayleigh waves velocity and stress with laser Doppler velocimeter

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Determination of relationship between Rayleigh waves velocit...

实验力学国际会议

作者： Shoichi Kobayashi Depatment of Construction eng. Fukui Univ. of Tech. Fukui 910-8505 Japan

＜正＞ A non-contact measurement technique of Rayleigh wave velocity is proposed. In the non-contact measurement system, a laser Doppler velocimeter is used to detect wave motions. With above technique, the relationship between Rayleigh wave velocity and stress for an aluminum alloy 5052 and steel SS400 is determined, and the results are in good agreement with that obtained by contact measurement method.

关键词： Rayleigh wave velocity laser Doppler velocimeter stress-acoustic coefficient sing-around method non- contact measurement.