其他论文
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⊙第31篇⊙
混凝土重力坝振动参数识别研究
（观看全文请点击上面的链接）
注意：本论文已在《水力发电》 2001,(2)17-19.发表
使用者请注明论文出处
王登刚, 刘迎曦，李守巨
（大连理工大学 工程力学系，辽宁 大连，116024）
摘 要：本文基于最优控制解的理论，建立了引入先验约束条件的混凝土重力坝动态参数识别模型，提出了求解该模型的约束变尺度方法。以某大坝空库情形为例，在振动观测数据不完全的条件下，对本文所提出的动态材料参数识别方法进行考察。识别结果表明，本文方法不仅具有较高的计算精度和良好的数值稳定性，并且具有一定的抑制数据噪音的能力。在只有一阶圆频率和几个固定点处有一阶振型观测数据的情况下，可以可靠地识别出坝体混凝土和基础岩石的动弹性模量。从而为识别混凝土坝体和岩石基础弹性常数提供了一条新的有效途径。
关键词：振动参数；参数识别；混凝土重力坝；约束变尺度方法
WANG Deng-gang,
LIU Ying-xi, LI Shou-ju
(Dept. of Eng. Mechanics, Dalian Univ. of Technol, Dalian 116024, China)
Abstract：Based
on the theory of optimal control solution, the parameters identification model
was built to estimate the elastic material parameters of concrete dam according
to the model data of dam prototype experiment. The priori-constrained information
was considered in the present model. And the constrained variable metric algorithm
was proposed to solve it. The present process was inspected through using
the incomplete measuring data of the concrete gravity dam under the condition
of empty reservoir. Numerical results show that the present method not only
has high precision and good stability, but also has powerful capability to
restrain noise of measurements. The elastic modulus of dam concrete and that
of rock basement could be reliably identified only using the first order frequency
and the first order vibration mode values at several fixed points in the dam.
Consequently a new reliably approach to identify dynamic elastic modulus of
dam concrete and that of rock basement.
key
words：vibration
parameters；parameter
identification；concrete
gravity dam；constrained
variable metric algorithm
⊙第32篇⊙
求解不可微函数优化的一种混合遗传算法
（观看全文请点击上面的链接）
注意：本论文已在《东北大学学报(自然科学版)》2001,22(S1)74-77.发表
使用者请注明论文出处
王登刚，刘迎曦，李守巨
（ 大连理工大学 工程力学系，辽宁 大连，116024）
摘 要 在浮点编码遗传算法中加入Powell方法，构成适于不可微函数全局优化的混合遗传算法。混合算法改善了遗传算法的局部搜索能力，显著提高了遗传算法求得全局解的概率。由于只利用函数值信息，混合算法是一种求解可微和不可微函数全局优化问题的通用方法。
关键词 全局最优；混合算法；遗传算法；Powell方法
WANG Denggang,
LIU Yingxi, LI Shouju
( Dept. of Eng. Mechanics., Dalian Univ. of Technol. Dalian, 116024)
Abstract
A
hybrid computational intellective algorithm for locating the global optima
of indifferentiable nonlinear function was put forward by setting the Powell
algorithm in real-code genetic algorithm. The hybrid approach improved the
local searching ability of the genetic algorithm and promoted the probability
for the global optima greatly. Because only the objective values are used,
the hybrid approach is a generalized genetic algorithm for global optima of
differentiable and indifferentiable nonlinear functions.
Key words
global optima；hybrid
approach；genetic
algorithms；Powell
algorithm
⊙第33篇⊙
两个新型的八结点块体单元-三维离散算子差分法田中旭1
唐立民2
刘正兴3
张立志4
(1：上海大学，上海市机械自动化及机器人重点实验室，200072
2：大连理工大学，工程力学系，116024
3：上海交通大学，工程力学系，200030
4：吉林油田集团公司
131100)
摘要：本文给出了弹性力学三维问题的离散算子差分法，讨论离散算子差分法在三维问题中的特点，意在为该方法的进一步发展提供依据，为应用弱形式进行数值求解的研究提供参考。本文从弹性力学平衡方程更为一般的弱形式出发，给出了含边界参数的弱形式方程。由该方程不仅可以得到有限元法，还可得到离散算子差分法。给出了两个八结点块体单元，虽然单元中位移函数是非协调的，不需特殊处理便可保证离散格式收敛，并对单元位移有十分好的反映能力。
关键词：弱形式
导出方程
离散算子差分法
有限元法
分类号：O242.21
Two
new eight node brick element-three dimension discrete operator difference
method
Tian
Zhongxu1 Tang Limin2
Liu Zhengxing1 Zhang
Lizhi3
(1：Shanghai
University, Shanghai Enhanced Laboratory of Manufacturing Automation &Robotic,
200072
2：Dept.
of Eng. Mechanics, Shanghai Jiaotong Univ., Shanghai 200030
3：Dept.
of Eng. Mechanics, Dalian Univ. Of Technology, Dalian 116024
4：The
company of Jilin oil field, 131100)
Abstract:
Discrete operator difference method
was given for elastic problems in three-dimension. The properties of the method
in three-dimension were talked about in order to provide some basic material
for its further development and some reference for the study of solutions
by using weak form equations. A weak form equation containing boundary parameters
was given for elastic problems in three-dimension. Both finite element method
and discrete operator difference method can be pushed forward from which.
Two eight-node brick elements were generated using discrete operator difference
method. Although the displacements are non-conforming, their discrete schemes
are convergent without additional disposal. Furthermore, this method is very
simple both in formula’s generating and in programming, and the computational
results are stable while the meshes are changed.
Key words: weak forms;
driving equation; discrete operator difference method; finite element method
⊙第34篇⊙
弱形式方程中分片函数奇异性的光滑化分析田中旭 刘正兴
上海交通大学工程力学系，上海，200030
摘要：本文研究了弱形式方程中的分片光滑函数因求导数出现的奇异性问题，意在为得到得到离散格式时正确处理这一问题提供依据。本文是在不改变拟合性质的情况下，将分片函数光滑化，则分步积分公式仍然有效，并通过光滑后的函数讨论其积分的性质。经过分析总结出了几条计算规则，文中的典型例子说明这些计算规则是合理而有效的。
关键词：光滑化，弱形式，计算规则，有限元，离散算子差分，再现
Smoothing Analysis
for the Singularity of Patch Functions in Weak-Form Equations
Tian Zhongxu Liu Zhengxing
Department of engineering Mechanics, Shanghai Jiaotong University, Shanghai 200030
Abstract:
In weak form equations, singularity problems will be faced when derivatives
of patch functions are concerned. This paper concentrates on the disposal
of the singularities of the sample and test functions in week forms, So that
.to provide some rules for the disposal of the singularity. Through the analysis,
the patch functions were smoothing without any change of their property of
fitting and integrate property are analyzed. Some computational rules are
given to ensure the singularities be disposed of properly while obtaining
the discrete forms. These computational are frank and easy to be used. The
computational rules can also be some basis of the analysis for the singularity.
Two typical elastic problems, Beam bending and thin plate bending problems
are disposed of and analyzed. The examples have shown that these rules are
useful and reasonable.
Key Words: smoothing, weak-form, computational rules, finite element
method, discrete operator difference, reproduction
⊙第35篇⊙
Hamiltonian Formulation of Nonlinear Water Waves in a Two-Fluid SystemApplied Mathematics and Mechanics - English Edition, Vol. 20, No. 4, pp. 343-349, Apr 1999.
Lu
Dongqiang, Dai Shiqiang, Zhang
Baoshan
(Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,
Shanghai 200072,P R China)
Abstract:
In this paper, it is dealt with that the Hamiltonian formulation of nonlinear
water waves in a two-fluid system,which consists of two layers of constant-density
incompressible inviscid fluid with a horizontal bottom,an interface and a
free surface. The velocity potentials are expanded in power series of the
vertical coordinate. By taking the kinetic thickness of lower fluid-layer
and the reduced kinetic thickness of upper fluid-layer as the generalized
displacements, choosing the velocity potentials at the interface and free
surface as the generalized momenta and using Hamilton's principle, the Hamiltonian
canonical equations for the system are derived with the Legendre transformation
under the shallow water assumption. Hence the results for single-layer fluid
are extended to the case of stratified fluid.
Key words: two-fluid system; Hamilton's principle; nonlinear water
waves; shallow water assumption; Hamiltonian canonical equations
一个二流体系统中非线性水波的Hamilton描述
卢东强 戴世强 张宝善
(上海大学应用数学与力学研究所)
摘要： 讨论了一个二流体系统中非线性水波的Hamilton描述，该系统由水平固壁之上的两层常密度不可压无粘流体组成，上表面为自由面．文中将速度势函数展开成垂向坐标的幂级数，在浅水长波的假定下，取下层流体的“动厚度”与上层流体的“折合动厚度”为广义位移、界面上和自由面上的速度势为广义动量，根据Hamilton原理并运用Legendre变换导出该系统的Hamilton正则方程，从而将单层流体情形的结果推广到分层流体的情形．
关键词： 二流体系统； Hamilton原理； 非线性水波； 浅水假定； Hamilton正则方程
中图分类号： O353.2 文献标识码： A
文章编号：1000-0887(1999)04-0331-06
⊙第36篇⊙
三维非连续变形分析方法中角-面接触模型的研究摘要：提出了三维DDA的角-面接触模型,并用矢量方法和罚函数法给出了详细的理论推导。算例表明,所提出的角-面接触模型是正确的,并且易于编程实现。
关键词：非连续变形分析,进入面,罚函数法分类号 O242,P244 文献标识码 A 文章编号 1000-6915(2000)增-0930-06
A STUDY ON ANANGLE-FACE
MODEL OF THREE DIMENSIONAL DISCONTINUOUS DEFORMATIONAN ALYSIS
Jiang Qinghui, Feng Dingxiang
Chinese Journal of Rock Mechanics and Engineering. June,2000
(InstituteofRockandSoilMechanics,TheChineseAcademyofSciences, Wuhan 430071 China)
Abstract:The
angle-face contact model of three dimensional discontinuous deformation analysis
is established and its formulation is det derived by vector analytical and
penalty function method. The result of three typical examples indicates that
the proposed model is correct and easy to program.
Keywords:discontinuous deformation analysis,the reference face,penalty
function method
⊙第37篇⊙
粘弹性类型岩石——泰山花岗岩动态凿入特性的实验研究
（下载论文全文请点击上面的链接）
注意：本论文已在《岩石力学与工程学报》2000，第19卷（5）：613-617发表
使用者请注明论文出处
（EI
village已经收录本文）
姜清辉 1 罗先启 1 赵统武 2 丰定祥 1
(1.中国科学院武汉岩土力学研究所 武汉 43 0 0 71 )
(2.长沙矿冶研究院 长沙 41 0 0 1 2 )
摘要 运用两点应变测量法的基本原理进行了圆柱形杆末端冲击力测试实验 ,理论值和实测结果取得了一致 ,验证了其可行性 ,并利用两点应变测量法对岩石的动态凿入特性进行实验研究
,根据最小二乘法曲面拟合 ,得出了更为精确的凿入系数和粘度系数值 ,并在实验的基础上综合得到粘弹性类型岩石——泰山花岗岩力——凿深特性的一般模式。
关键词 两点应变测量法 ,岩石的力 -凿深特性 ,凿入系数 ,粘度系数
TESTING STUDY ON
DYNAMIC PENETRATION CHARACTERISTIC FOR TAISHAN GRANITE WITH VISCOUS-EL ASTICITY
Jiang Qinghui1 , Luo Xianqi1
, Zhao Tongwu2 ,
Feng Dingxiang1
(1 Institute of Rock and Soil Mechanics,The Chinese Academy of Sciences,
Wuhan
430 0 71 China)
(2 Changsha Research Institure of Mining and Metallurgy,
Changsha 41 0 0 1 2
China)
Abstract
The impact force at the end of
a cylindrical rod can be estimated by measuring the strains at two suitable
points on it. The theoretical value is in well accordance with the testing
resultand the feasibility is verified. The dynamic penetration characteristic
of rock is determined in each test by using the technique from two-point strain
measurement. The accurate dynamic penetration coefficient and viscous damping
coefficientof rock are evaluated by regressive analysis,and the typical model
of the force-penetration relation of Taishan granite with viscous-elasticity
is determined.
Key words two-point
strain measurement method, force-penetration characteristic of rock, dynamic
penetration coefficient,viscous damping coefficient
⊙第38篇⊙
粘弹三维非连续变形分析方法中的锚杆模拟
（下载论文全文请点击上面的链接）
注意：本论文已在《岩土力学》2001，第22卷（2）：176-178发表
使用者请注明论文出处
（EI
village已经收录本文）
姜清辉，丰定祥
（武汉大学水电学院，湖北武汉；中国科学院武汉岩土力学研究所湖北武汉）
摘要：提出了三维非连续变形分析方法中锚杆的简化模型，给出了相应的算法和公式。算例表明，该模型能较好地反映锚杆的加固效果。
关键词：节理岩体；三维非连续变形分析；锚杆
Modeling
of rockbolts in three-dimensional discontinuous deformation analysis
Jiang Qinghui1 ,
Feng Dingxiang2
(1 College of Water Couservancy and Hydropower Engineering, Wuhan
430 0 72 China)
(2,Institute of Rock and Soil Mechanics , The Chinese Academy of Sciences,
Wuhan 43
0 0 71 China)
Abstract
Based on three-dimensional
DDA method, a simple three-dimension model was proposed to analyze rockbolting
and the corresponding algorithm and formulas were given. The calculation example
of the tunnel excavated shows that the model has a good reflection of the
reinforcing effects of rockbolts in the longitudinal direction.
Key words: jointed rockmass; 3-D discontinuous deformation analysis;
bolt
⊙第39篇⊙
结构可靠性分析的区间方法
（下载论文全文请点击上面的链接）
注意：本论文已在《核动力工程---12届全国反应堆结构力学会议论文专辑》244-247.
2002年9月,烟台发表
使用者请注明论文出处
王登刚，李杰
（同济大学 建筑工程系，上海，200092）
摘要：
工程中的不确定性可以分别用随机方法，模糊方法和区间方法来建模。本文采用区间数描述具有不确定性的结构参数，基于区间数学知识，建立了一种新的可靠度度量体系和分析方法。当没有足够的实验数据获得结构参数的概率密度函数（或隶属度函数）时，这种方法比基于概率论（或模糊数学）的可靠度分析方法更为适用。为了克服直接采用区间计算法则计算结构功能区间函数时计算结果易于扩张的问题，把结构功能函数的计算转化为求解两个优化问题分别确定功能函数的上下限值，并采用一种具有全局寻优能力的智能性算法－实数编码遗传算法―来进行求解。算例对本文方法的可行性和有效性进行了验证。
关键词：结构可靠性；区间分析；区间数学；遗传算法；非概率的
Wang
Denggang , Li Jie
（Department of Building
Engineering, Tongji University, Shanghai, 200092,China）
Abstract:
The imprecision or uncertainty present in many engineering
problem can be modeled using probabilistic, fuzzy, or interval methods. By
representing the uncertain structural parameters as interval numbers, a new
measure and analysis methodology for structural reliability computation is
put forward in this paper, which is based on the theories of interval mathematics.
The priori probability density function or subjective function of the structural
parameters is not needed in this methodology. So it is more suitable than
probabilistic and fuzzy approach when there is no sufficient experimental
data to obtain these functions. Overestimation is a major drawback in interval
computations. In order to overcome this drawback, the structural functional
function was calculated by using of two optimization problems to obtain its’
lower and upper bounds respectively. Moreover, an intellective algorithm named
as real-code genetic algorithm was introduced to locate the global optima
of the two optimization problems. Examples show that the presented method
is feasible and efficient.
Key Words:
structural
reliability; interval analysis; interval mathematics; genetic algorithms;
non-probabilistic
⊙第40篇⊙
A
Relialble Approach to Compute the Forward Kinematics of Robot with Uncertain
Geometric Parameters
（观看全文请点击上面的链接）
注意：本论文已在《核动力工程---12届全国反应堆结构力学会议论文专辑》244-247.
2002年9月,烟台发表
使用者请注明论文出处
Wang Denggang 1 （王登刚）, Guo Jianying
2
1: Department of Building Engineering, Tongji University, Shanghai, 200092,
China
2: Mechanical Engineering School, Shanghai Jiao Tong University, Shanghai,
200030, China
Abstract:Uncertainties
widely exist in engineering structural analysis and mechanical equipment designs,
and they cannot always be neglected. The probabilistic method, the fuzzy method
and the interval method are the three major approaches to model uncertainties
at present. By representing all the uncertain length and the uncertain twist
of the link parameters, and the uncertain distance and the uncertain angle
between the links as interval numbers, the static pose (position and orientation)
of the robot end effector in space was obtained accurately by evaluating interval
functions. Overestimation is a major drawback in interval computation. A reliable
computation approach is proposed to overcome it. The presented approach is
based on the inclusion monotone property of interval mathematics and the physical/real
means expressed by the interval function. The interval function was evaluated
by solving the corresponding optimization problems to determine the endpoints
/ bounds of every interval element of the solution. Moreover, an intelligent
algorithm named as real-code genetic algorithm was used to locate the global
optima of these optimization problems. Before using the present approach to
determine the response interval of uncertain robot system, some mathematical
examples were used to examine its efficiency also.
Key words: robot kinematics; interval analysis; global optimization;
uncertain geometry parameter
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