w*********h
发帖数: 664 | 1 我也收到猎头的电话了
此人联系方式是
Ryan Urban
Work: 732-447-1232 E-mail: r****[email protected]
具体内容如下
FEA Engineer Job Description
Looking for a development engineer to perform advanced finite element analys
is for solution of complex structural problems related to development of eme
rgency slide systems.
This individual acts as the primary FEA analyst for the company, therefore r
equiring a very solid understanding of FEA functions, such as modelling, mes
hing, element limitations, setting of boundary conditions,... 阅读全帖 |
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l******i
发帖数: 1404 | 2 不知道为什么金融数学的计算里面不怎么引入finite element method.
现在解大部分物理方程已经不用空间上的有限差分了，因为误差原因，
离散时间用显式表达微分项的话，空间离散的程度必须非常高，才能让误差可以接受；
基本上涉及到物理量的扩散和对流的方程都不会再用有限差分了；
目前来说，解每个时间定点上的Stokes问题的话，
还是用有限元比较多（stokes需要用到mixed finite element）或者有限体积（finite
volume），一是算的快，二是误差小，而且符合微分几何里面的真解的一些代数性质，
比如梯度场对应点，散度对应边，正好和离散空间在的基函数配起来；
另外Navier-Stokes最关键的问题还在于解决那个速度和速度的梯度做内积的非线性项，
很多离散问题都避开那个，
也就是避开了速度的空间变化对于速度的时间变化的影响
（即连续介质方程中都要涉及到的对流项），其实是很取巧的；
有限差分（finite difference）和有限元（finite element）区别还是很大的，在一
维你可以认为他们是相同，但在2维以上完全不同，有限差分是把空间离散... 阅读全帖 |
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r****y
发帖数: 1437 | 3 For same-order schemes of finite difference and finite volume,
which one is more numerically diffusive?
Thanks in advance. |
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l***m
发帖数: 920 | 4 Finite element is not as easy to apply as finite difference. It remains
unpopular in the US, I believe only a few French in this world still
actively researching on FE.
A good FE method requires a good meshing technique, which appears way harder
than building a grid for FD. It is not uncommun to hear that in some
industries like car making , there is a job called "mesher", for those who
try to find best possible mesh everyday...
finite
项， |
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w********l
发帖数: 11447 | 5 随便搜了他两个帖子。就这还小将呢。靠，老将就那么丢脸吗？
================================================
发信人: finite (螺旋), 信区: Military
标 题: Re: 毛轮和普世老将其实都属于左派
发信站: BBS 未名空间站 (Sun Apr 8 02:22:12 2012, 美东)
扯，毛派是赤化，属于变态版的西化
发信人: finite (螺旋), 信区: Military
标 题: Re: 中国贫穷与共产党责任---李敖拍案而起！
发信站: BBS 未名空间站 (Sun Apr 8 16:35:21 2012, 美东)
老蒋的责任确实还小些，因为老蒋当时根本没能力控制全中国
老毛倒是实现了真正的中央集权，还好意思把责任往老蒋身上推
李敖因为他和国民党的恩怨，就胡说八道 |
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x******r
发帖数: 367 | 6 I would like to find an appropriate introductory Finite Element method book.
I have learned mathematics analysis, linear algebra and numerical analysis
before.
But I have not learned functional analysis.
Can anyone recommend a Finite Element method book without too many mathematics
flavors to me?
Thanks a lot for your help. |
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c*******n
发帖数: 1648 | 7 【 以下文字转载自 Computation 讨论区,原文如下 】
发信人: xiaozhu (體育用品), 信区: Computation
标 题: an online book: Finite Element Analysis
发信站: Unknown Space - 未名空间 (Wed Mar 3 23:47:19 2004) WWW-POST
Finite Element Analysis
with
Error Estimation
by
J. E. Akin
Rice University
Department of Mechanical Engineering
and Materials Science
Houston, TX 77251−1892
(Enlarged PDF copies are viewable at
http://www.owlnet.rice.edu/~mech517/Books/ )
Draft 4.1 Copyright © 2003. All Rights Reserved. |
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c*******e
发帖数: 8624 | 8 你把问题贴出来吧,包括bc,
finite difference和finite element两回事
fe里面的数学背景要高一个数量级 |
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c*******e
发帖数: 8624 | 9 你把问题贴出来吧,包括bc,
finite difference和finite element两回事
fe里面的数学背景要高一个数量级 |
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n********r
发帖数: 65 | 10 let v_1 v_2, ..., v_n be a set of column N-dimensional vectors with it's
elements lie in the finite field Z_p, where p is a prime number. Z_p = {0,1,
2,...,p-1}.
suppose the set {v_1,v_2, .., v_n} is linearly independent in the finite
field Z_p,
then does this fact implies that {v_1,v_2, .., v_n} is linearly independent
if they are viewed
as the vectors with base field R (real number field) |
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n***p
发帖数: 7668 | 11 记得愚公移山么？
如果愚公只是自己这一辈子移山，那是finite
但是他想连子孙都搭进去，‘子又生孙，孙又生子，子子孙孙，无穷尽焉’，那就是
countable but not finite. |
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h********g
发帖数: 5 | 12 Finite Element Analysis of the Indentation-Induced
Delamination of Bi-Layer Structures
Ming Liu and Fuqian Yang∗
Materials Program, Department of Chemical and Materials Engineering,
University of Kentucky, Lexington, KY, 40506, USA
Journal of
Computational and Theoretical Nanoscience
Vol. 9, 851–858, 2012
Contact deformation can cause local damage of mechanical structures and lead
to structural failure
of mechanical devices. In this work, we use the finite element method
to analyze t... 阅读全帖 |
|
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a*******y
发帖数: 235 | 14 有个造谣帖子说，美国护照封面上写着“美国军队是你强大的后盾”。
然后finite看到这个帖子，就自摸高潮了，痛批了一番中国政府如何邪恶，在护照上写
着“请遵守当地法律法规”，不如美国政府派军队保护公民，不如美国政府在护照上印
着“美国军队是你强大的后盾”。 |
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p********8
发帖数: 2061 | 15 傻逼，你看看你自己的帖子。
装中国人之前，还是把中文学好吧。
发信人: finite (螺旋), 信区: Military
标 题: Re: 亚裔男的在美国受歧视的原因很简单
发信站: BBS 未名空间站 (Sat Jul 4 00:36:44 2015, 美东)
这个和菌斑崇拜洋妞，损国女身材不行一样
男女都有外形歧视，国男比国女劣势更大，这都是客观事实，索南自己也不能免俗 |
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l*******o
发帖数: 5673 | 16 这个finite和那个withourcar/wugongoanda都是极品 现实生活中都不知道是啥样的变
态 估计人人绕着走吧 我不觉得有老中能忍受得了这种人 老将也不至于这样 |
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g****t
发帖数: 31659 | 17 Finite and infinite games 这本书，
其实是一本神学书，我觉得是解释Bible的。
没想到20年后，被一帮设计软件的
码工再次炒红，还出了中文版。 |
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t*****r
发帖数: 448 | 18 I think Fortran code is very easy to be transfered into MATLAB
You may find some commercial software to do that for you.
you may try searching key words such as MATLAB + "FINITE ELEMENT" + CODE
in google |
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w*******g
发帖数: 99 | 19 I think by searching FEM on the web you can find a lot of good materials about
finite element, both introduction, tutorial and codes, even some very powerful
codes. Good luck! |
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x*****u
发帖数: 3419 | 20 Finite Element Analysis
with
Error Estimation
by
J. E. Akin
Rice University
Department of Mechanical Engineering
and Materials Science
Houston, TX 77251−1892
(Enlarged PDF copies are viewable at
http://www.owlnet.rice.edu/~mech517/Books/ )
Draft 4.1 Copyright © 2003. All Rights Reserved. |
|
d****i
发帖数: 360 | 21 建了一个模型，要用finite devided difference method 来解出来。有没有人给建议本
好的参考书？THANKS A LOT！ |
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s***t
发帖数: 195 | 22
i knew this. but i don't know too much about finite difference. so pardon
my ignorance. this is kind of an interview question.
then what's special about "parabolic" and "explicit"? |
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d****i
发帖数: 360 | 23 建了一个模型，要用finite devided difference method 来解出来。有没有人给建议本
好的参考书？THANKS A LOT！ |
|
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d*********g
发帖数: 49 | 25 做随即控制问题做到一个高维的两次parabolic type PDE,想要用有限差分做一个
数值解试试。现在两次导数前面的系数有state variable, 符号不定，导致
一般做法下得到的finite difference scheme没有单调性。不知道这种
情况是不是还有希望，请教熟悉的同学推荐一些书或者论文。 |
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m****n
发帖数: 45 | 26
What is "monotonicity" for a finite difference scheme? |
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w**d
发帖数: 2334 | 27 It is very tricky for Chebyshev collocation, because the weight function.
You can check David Gottlieb's work. He did some work about 20 years ago.
It surely has the issue of stability, no matter it is onestep or multistep.
For finite difference, if the problem is periodic, you can use Von Neumann
stability analysis; if the problem is IBVP, things become much more
complicated, but we still have general ways to check the stability of the
boundary conditions (which is essentially due to the fact |
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c****n
发帖数: 2031 | 28 It surely has the issue of stability, no matter it is onestep or multistep.
For finite difference, if the problem is periodic, you can use Von Neumann
stability analysis; if the problem is IBVP, things become much more
complicated, but we still have general ways to check the stability of the
boundary conditions (which is essentially due to the fact that the
corresponding discrete linear operator is diagonalizable, e.g. by Fourier-
Laplace transform). What I'd like to know is that for Chebychev s |
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g******a
发帖数: 69 | 29 This is not the point.
The problem is convergence or stability...
Also, finite difference solution is linear in each intervals???
You must mess it up with FEM. |
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c****n
发帖数: 2031 | 30 It surely has the issue of stability, no matter it is onestep or multistep.
For finite difference, if the problem is periodic, you can use Von Neumann
stability analysis; if the problem is IBVP, things become much more
complicated, but we still have general ways to check the stability of the
boundary conditions (which is essentially due to the fact that the
corresponding discrete linear operator is diagonalizable, e.g. by Fourier-
Laplace transform). What I'd like to know is that for Chebychev s |
|
w**d
发帖数: 2334 | 31 It will be very beneficial to read some book.
For time dependent problem, the definition of stability
should be the same for whatever schemes. It basically means
the energy is bounded.
Assume the final time is T, the time step dt = T/N.
Let u_n be numerical solu at t=t_n. For finite difference/element,
u_n is mostly piecewise polynomials, not necessary linear.
For spectral methods, u_n will be a global polynomial.
Just like for u, we can define some norm(energy) for u_n. Then
the stability means |
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w**d
发帖数: 2334 | 32 It is very tricky for Chebyshev collocation, because the weight function.
You can check David Gottlieb's work. He did some work about 20 years ago.
It surely has the issue of stability, no matter it is onestep or multistep.
For finite difference, if the problem is periodic, you can use Von Neumann
stability analysis; if the problem is IBVP, things become much more
complicated, but we still have general ways to check the stability of the
boundary conditions (which is essentially due to the fact |
|
n*****n
发帖数: 100 | 33 让prove a algorithm is finite.这个是线性问题算法。 |
|
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p**********9
发帖数: 58 | 35 大家好，2个月后就master毕业了，现在工作还没有着落。面试少的可怜。
想看看版上有没有finite element analysis方向的牛人帮忙推荐个实习或者工作，
本人女，对工资要求不高，只要有一份工作，生活充实点就好了，比较垃圾的学校毕业。
能帮忙的jjgg，先谢过了，给我发信哈。 |
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p**********9
发帖数: 58 | 36 大家好，2个月后就master毕业了，现在工作还没有着落。面试少的可怜。
想看看版上有没有finite element analysis方向的牛人帮忙推荐个实习或者工作，
本人女，对工资要求不高，只要有一份工作，生活充实点就好了，比较垃圾的学校毕业。
能帮忙的jjgg，先谢过了，给我发信哈。 |
|
h********2
发帖数: 33 | 37 求审稿机会, 方向为finite element analysis,composite materials, heat and mass
transfer, solid mechanics
如有推荐可联系
[email protected]/* */
谢谢大家的帮忙 |
|
y*h
发帖数: 2121 | 38 楼主跟我方向完全一样啊。同求。
finite element analysis,composite materials, heat and mass
transfer, solid mechanics
[email protected] |
|
h********g
发帖数: 5 | 39 Understanding the electrothermal-mechanical behavior of electronic
interconnects is of practical importance in improving the structural
reliability of electronic devices. In this work, we use the finite-element
method to analyze the Joule-heating-induced thermomechanical deformation of
a metallic sphere that is sandwiched between two rigid plates. The
deformation behavior of the sphere is elastic–perfectly plastic with Young
’s modulus and yield stress decreasing with temperature. The mechanical... 阅读全帖 |
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g****e
发帖数: 10 | 40 【 以下文字转载自 EE 讨论区 】
发信人: gozune (allen), 信区: EE
标 题: RF/EM, Finite element 的大侠请帮忙
发信站: BBS 未名空间站 (Mon Dec 15 16:18:17 2008)
本人初学用有限元方法来模拟RF/EM问题。 现考虑平面波在无限大air-glass 界面的反
射／折射 （y=0 为界面），平面波在上半平面（air)入射到界面。 我选择矩形计算窗
口：左，右 为周期性边界，上下用PML . 用COMSOL的RF In-plane TE model (
scattered field formulation), 模拟结果总是不对。 原因是 total e-field 在y=0
界面不连续。琢磨多时也不得要领。请经验的大虾指点一下， 非常感谢！ |
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l***u
发帖数: 26081 | 41 想了解一下finite element在finance上的应用。
请大家推荐些书或论文
谢谢！ |
|
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a*********7
发帖数: 4 | 43 正在看John hull的书，其中finite difference method 中有个例子，怎么算也跟结果
不符，不知道，在微分方程中的Sigma用不用换算到当期的，把标准的年波动率换算成
半个月的？ |
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b***k
发帖数: 2673 | 44 ☆─────────────────────────────────────☆
accumulator (power) 于 (Fri Dec 7 23:07:33 2007) 提到:
Does anyone know the answer for this question? Thanks a lot.
1) If you are solving a parabolic partial differential equation by using
explicit finite difference method, is it worse to have too many time steps
or too fine a grid in the space dimension? Why?
2) To get 3 heads in a row, what is the expected minimum times of coin
tosses needed?
☆─────────────────────────────────────☆
moreroads (做好自己的 |
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d********t
发帖数: 9628 | 45 几种finite difference都是
du/dt = d^2u/d^2x
为啥呢？还是直接从热传导公式过来的？ |
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d********t
发帖数: 9628 | 46 几种finite difference都是
du/dt = d^2u/d^2x
为啥呢？还是直接从热传导公式过来的？ |
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o******e
发帖数: 3522 | 47 只有傻子才用fem搞金融，呵呵，不过还是很多Quant在用fem
换个话说，金融的问题比起物理工程类的问题简单很多很多。 杀鸡何必用牛刀呢？
finite
项， |
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p**n
发帖数: 10 | 48 I would like to solve the following diffusion equation in 3 dimension
using finite element method.
-grad{D(x,y,z)grad[U(x,y,z)]}+h(x,y,z)U(x,y,z)=0
subject to mixed boundary conditions
This is a pretty standard problem. I was wondering if any one knows
there are any 3D FEM matlab code (or other codes) that can solve this
equation (and I can download)? If you know please let me know
bow!!! |
|
b*****9
发帖数: 8922 | 49 ☆─────────────────────────────────────☆
repeating (randomly) 于 (Sat Aug 21 00:18:09 2010, 美东) 提到:
合肥男子自驾车横穿美国游玩(组图)
http://www.sina.com.cn 2010年08月20日10:40 新安传媒网
合肥男子自驾车横穿美国游玩(组图)
一家五口在尼亚加拉大瀑布前留影。
合肥男子自驾车横穿美国游玩(组图)
黄石湖旁小憩。
黄伟1998年本科毕业于华中理工大学，2000年来到合肥“科学岛”读研，2005年毕
业后到加拿大，一年后前往美国，在太平洋西北国家实验室从事博士后研究。今年初，
又到“常青藤联盟”中的美国布朗大学担任助理教授。7月份，黄伟辞职，准备回合肥
，并预订了8月初从洛杉矶到上海的飞机票，而在此之前，他想和家人先在洛杉矶附近
玩玩。
在美国，没人能离开车。但布朗大学在美国东北角的罗德岛州，洛杉矶在美国的西
海岸，黄伟要把“座驾”运过去，只有两个办法。一是托运，另一个是自己开车横穿美
国。但黄伟一打听，托运估计要花900美元，很贵，而且很多行李... 阅读全帖 |
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l*********2
发帖数: 95 | 50 各位板上的学长学姐,小弟是3+2项目的,现在是大四学生,但已经在普渡大学读机械
系的研究生课程.
我下周就要开始选下学期的课了,但是由于我还不是正是的研究生,没有导师指导选
课,现在比较迷茫.
本人想读固体力学方向,昨天问了一位教我ME4800 finite element analysis的教
授,他向我推荐先修一门弹性力学(CE 59500 - Finite Elements In Elasticity 或者
AAE 55300 - Elasticity In Aerospace Engineering) 然后修读 ME 55900 -
Micromechanics Of Materials 和 ME 61200 - Continuum Mechanics.
大家觉得如何?本人打算硕士毕业出来找工作，想多读些实用的课程。
普渡non-theis硕士的修读计划是读10门硕士课程即可，数学课（MA）至少读一门
，但是我也完全没思路,不知道选那些有用.一直想找本院的师兄师姐问问,无奈没有找
到读固体陆雪的,所以向板上求助.
今早用googl... 阅读全帖 |
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