Sender: wuree (Wilderness), the letter area: Fea Title: How to learn the financing station on the view of Tsinghua finite yuan sector: BBS Shuimu Tsinghua Station (Fri Aug 13 17:08:43 2004) , the station
Accurately, it should be to talk about the quality of the post here. For professional reasons, I have a deep feelings about finite yuan and their software. It is also because I have been deeply aware of Tsinghua, but I have not come to Tsinghua deep because some reasons have not been to Tsinghua. Write this article to spend almost a complete afternoon, but I am willing. I know that learning finite yuan is not a matter of easy things, I will say my idea, I hope to benefit beginners. Frankly, I think the quality of the finite element sector is not high. The reason is because many people here are too simple and are not responsible for themselves. This is not the wrong mode, because many of us have not developed a good professionalism and rigorous spirit. Please don't deny my evaluation, ok? At least, please don't now. It is for me, it should be after reading my words. I use my way of thinking, not everyone will habits, please forgive me! I have to declare that my own level is generally general, I have a lot of dissatisfaction with myself, so I am very naive or wrong here. Please advise! We should have a good discussion atmosphere. Finite elements for the people of many engineering, their necessity and importance are self-evident. The problem is what should I learn? Learn it, at least if it doesn't have to harm others, I think there are at least four aspects of the following aspects: 1. Basic theory of finite element and its solution (mathematics foundation); 2, finite element professional English ( English foundation); 3, your own professional Dongdong (professional foundation); 4, geometric modeling and topology knowledge (modeling foundation). This sort is being kept light. Next, I first said the meaning and role of the above four aspects; after talking about why I think a considerable part of the question asked here is too simple and is irresponsible to yourself. 1. Do you have a professional look. Our science and engineering students don't have a hard work. It is impossible to have truly harvest. Harvest and pay here are proportional. Often some people think that the software of finite element is very difficult, not good, not easy to use, and many things don't understand, and they will hurt. In fact, this considerable part of this is the problem that the basic theory of finite element can solve, not the software's design ideas. Nowadays, the commercial finite element software, such as I have used Abaqus, ANSYS, Adina, and Algor, you should say that their interface is already friendly, including help documents, and more. A large extent, the user's question is that the user does not care about the finite element basic theory. For example, many people don't know what the ANSYS is related to the relationship between KEYPOINT, LINE, AREA, etc., and the finite element model does not have any inevitable links. They are only the intermediate means provided by the software to establish finite element models. Is there any difference between the two-dimensional solid unit (2-D Solid Element) and the three space shell unit? Fundamentally, the freedom of the two is different. This concept will be mentioned in almost any finite element book. As long as you have the basic knowledge of elastic mechanics, it should not be difficult. However, when you encounter problems, do you think that your finger element is not enough? 2. Finite element theory can completely read Chinese books. However, learning finite element software is not enough. The large finite element software we use is almost all European and American products. They use English with almost no exception.
In order to solve this language problem, there have been many Chinese use reference books in many finite element software, especially the book of ANSYS, the most obvious, harmful! Although each such book is written in the author's name, as long as you feel a little bit of sex, you will understand that you will understand that the Chinese ANSYS use reference book is actually to help documents. Some part of translation OK. This author actually has a name - "Thief". Because such a book and the existence of such a person, if you have long enough to see the Chinese book, you are harmful. The reason is very simple, the contents of those books can provide, you can learn from the software English help. If there is a problem, English help documents can not solve it, then I will bet, "the book" of the "famous" "book" in the country will definitely blaspid. Many people are not used to seeing English help, but they are used to reading Chinese books. The reason is roughly in short confidence in their own English, and there is also the dependence on Chinese. You will find that you will not contact those English, you want to continue to advance. Of course, there are two points to explain that, when you just start, you can look at the use of Chinese in Chinese, but the sooner you use English, the second is, I feel that it is difficult to see English help, The problem is often not a problem with the language itself, but your unfamiliarity of finite element basic theories. At this time, I don't understand the use of Chinese. I should see the finite element book. 3. Finite elements can solve many problems. Simply put, there is almost that you can solve about the problem of continuous media. Therefore, electromagnetic field problems, mechanical field issues (including solid mechanics, fluid mechanics), temperature field problems, and coupling problems, limited elements often become preferred when performing computer numerical analysis simulation. Therefore, different professionals must understand their profession when using finite yuan. However, many people don't have big problems, they will not be nonsense. (Oh, someone else's professionalism is actually "nonsense", I don't understand what ^ _ ^). Still reminding a little, abstract your own professional issues into a finite element model, or be careful! ! 4, it is best to know a geometry and topological knowledge. Let's say it, when you use ANSYS, if you are building a geometric model in the three-dimensional space, then establish a finite element grid with it based on it, then you may be difficult to cut the six-sided body due to some places. Grid and headache, so that you have to use "Free Mesh" to generate yourself to see the nauseaful grid. So, what kind of geometric model can take a good grid? It is not enough to do things to do, just know that the shape of the geometry is not too deformed. Do you know that "Topology is invariant" and "Topological structure is not variable"? If you know, your modeling ideas will be relatively rational and clear. And these knowledge, you can refer to the related books of topology. Sister Suqing, I wrote a very thin book in decades ago, taught the most basic knowledge, writing very vivid, popular. Otherwise, buddy (or beautiful woman is fool) your old man also look at it?
Let's talk about why I think a considerable part of the question in this sector is too simple and is irresponsible to yourself. There is a violent tendency and not afraid of herole, I have retalled it, and I want to hide the guy who can get a brick, huh, huh. I am not against using the network, I oppose the use of network irresponsible treatments. For example, someone asked such a question: "Excuse me: What does this warning below? *** warning *** cp = 16348.630 time = 19:44:35 small equall equall equall equall equall equall equall equall equall equall equall equall equall = 3.698915243e-04 encountered at UY DOF Of node 108112. Check for an insufficiently constrained model. "I know what is going on. Because this English said clearly: Check for ansufficiently constrained model! ! - Check your model as this model is not enough. And this English also pointed out that the freedom constraints in the Y direction of the 108112 y is not enough. This warning information concise, how do you let me add the fuel to add vinegar to answer "What does this warning below? If you don't know where your constraint is wrong, I hope to answer accurately on the Internet, it should be impossible. Because there are many reasons for this warning information. This warning can be triggered by problems, displacement constraints, etc. No one knows your model online is an model of what is analyzing. So in the face of this warning, how much help you can give you more help? There is indeed a master on the Internet, but there is no mortgage of Mr., and there is no fairy that can be counted. I mean, it's not a problem. But you should learn to ask questions. Don't let go, ask, if you want to think, if you ask if you know, if you understand, what kind of level he can answer, especially in the network you may have a thousand miles away. This is said that you should ask questions. I know that people ask questions because there is no suitable person around you can ask, or it is very anxious, I think of the theoretical speed of 300,000 kilometers per second. However, a sentence of the ancients is often forgotten: "The speed is not reached." When you are anxious to sweat, please think about it, why is you anxious? Why are you in a hurry now? The more you try to solve professional problems in a few seconds in a few seconds, the easing that you are impetuous, there is no rigorous professionalism. If you are not specifically engaged in computer, and your machine is poisoned, then you can of course help. If you are learning mathematics, but there is no MM to pay attention to you, you can also ask for advice on the Internet. But if you are trying to solve the finite element professional problem, try to get it in the online three, the wrong person is you. Because it is impossible to implement. Others can tell you that the displacement and unit displacement of the Gauss point is different, but others can't make you understand the presence of a limited element method. Others can say that your temperature field is necessary and mechanical issues for finite element coupling analysis, but it is difficult for someone to make you understand whether your finite element model is appropriate. Others can tell you which problems should be paid attention to using Abaqus for the second development of this relationship with Abaqus, but when you start working, you will still fog. Simple saying that others can give you a direction, but others can't help you walk through the road that belongs to you.
If you ask questions just want to get the direction of others, avoid the danger of the South, then you are smart; but if you have a problem in the details, try to rely on others to help you, then you can do not learn to walk. At this time, you seem to be smart, but it is actually a chance to get hood and feelings in difficulties, friends, how far you can go on the road in the future? If you are anxious, you have no time, you can't wait to bring you a professional thousands of mountains, which means you haven't seriously prepared it. Don't expect to have an outbreak in expertise and level. No matter how beautiful you grow, you must pay rational and long-term efforts to become a professional "model". The warehouse promotes text, the words are disrespectful, please be sea! !
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※ Modification: · Wizard in AUG 14 18:54:09 Modified this article · [From: 166.111.177. *] ※ Source: · BBS Shuimu Tsinghua Station http://smth.org- [from: 211.162.187. *]
