"This is the sun gear, this is the large planet wheel. The number of teeth of the sun gear is 17 and the planet wheel is 80. Assuming the normal modulus is 8, the center distance is 388..., we divide the grid according to different accuracy, draw the non-meshing area a little thicker, and the meshing area is refined. Assuming the node displacement matrix is ​​u, the finite element strain and stress matrix is ​​as follows..."

Feng Xiaochen took a stack of blank maintenance registration forms and squatted on the ground, skillfully writing the equations of finite element analysis in the blank space on the back of the form, while explaining to Chen Bangpeng.

For later students who studied mechanical science, finite element analysis is the most basic homework. If they can't write a model of finite element analysis on a machine, they should really doubt whether his graduation certificate was paid for the phone bill. Considering that there are currently no professional finite element analysis software in China, all calculation processes need to be solved by the analysts' own programming, Feng Xiaochen highly simplified the analysis model, simplified the three-dimensional to two-dimensional, and added several constraints.

Even so, the equations he listed are much more accurate than the calculation models used by Chen Bangpeng in the past. Calculating them according to such a set of equations will be able to effectively solve the problem of gear load mismatch.

When Feng Xiaochen was writing these equations, Wang Weilong, Chen Bangpeng and several other technicians all surrounded him. They squat or stand, and were staring at the formulas and symbols written by Feng Xiaochen. Among these people, except Chen Bangpeng, they were not studying gears, but when it comes to issues such as frame structure and box structure, they also needed to use this set of stress analysis methods, so everyone was holding their breath, for fear of disturbing Feng Xiaochen, and at the same time desperately digesting the profound meaning contained in the equations written by Feng Xiaochen.

"This is the general analysis framework. When it comes to the division of grids, Chen can consider it again. The finer the plot, the better the analysis effect, but the calculation volume will increase geometrically. I am worried that the computers in your factory will not be able to afford it. There is also this contact stress equation, Chen can adjust it. I am an amateur, and the setting of the equation may not be accurate."

After writing all the equations, Feng Xiaochen stood up, handed a stack of forms to Chen Bangpeng, and said with a smile.

"So that's the case... Oh, it's really amazing!"

Chen Bangpeng took the stack of paper and looked back and forth. The more he looked, the more excited he became. There was no dissatisfied expression on his face. If it were ancient customs, he would have planned to bow to Feng Xiaochen and bow to him.

Some of the equations written by Feng Xiaochen are inaccurate, such as the concentric conditions and overlapping conditions of gears. In the eyes of Chen Bangpeng, a gear expert, seem very unprofessional. But what Chen Bangpeng saw was not these things. He focused on the analysis methods introduced by Feng Xiaochen, including how to divide finite elements, how to set strain matrix, stiffness matrix, etc., which are things he had never figured out before.

After listening to Feng Xiaochen's introduction from beginning to end, Chen Bangpeng felt a sudden realization. It turned out that finite element was like this. With his wisdom, he could completely construct a set of equations that conform to the actual situation based on the comparison and solve the problems in gear design.

As for specific algorithms, it is even more difficult for Chen Bangpeng. Luo Ye is a big factory and has purchased several computers in the past two years. Chen Bangpeng and many people in the technical department have taught themselves algorithm grammars such as algol60, and can proficiently compile programs and convert algorithms on paper into computer algorithms.

"That's great, it's great!" Chen Bangpeng said repeatedly. He turned to look at Feng Xiaochen, with a embarrassed look on his face and said in a daze: "Director Feng, just now...ah, I won't say anything. During the meal, I will punish him three cups and apologize to Director Feng."

Feng Xiaochen smiled and said, "Mr. Chen is so serious. What crimes are not guilty? You are all heroes of the development of 120-ton dump trucks. I admire you too much. Also, don't call me Director Feng. If you really treat me as a friend, it's just like Brother Wang, just call me Xiao Feng."

"This..." Chen Bangpeng looked at Wang Weilong, not knowing whether he should listen to Feng Xiaochen.

Wang Weilong smiled and said, "No need to be polite. Xiao Feng is famous for his kindness in our Metallurgical Bureau. Do you still remember the fact that Xue Li took her children to Beijing for medical treatment. Xiao Feng saw that it was too hard for them to squeeze the bus every day, so he forced himself to sell his face to help us borrow a house from the Qianmen. From that incident, I recognized Xiao Feng as my best little brother. Everyone, like me, treated Xiao Feng as their friend, and just called him Xiao Feng."

After he said this, everyone laughed, walked up to greet Feng Xiaochen with affection:

"Xiao Feng, it's amazing!"

"Xiao Feng, I'm in my 20s this year? Where did you learn from this skill? I've given us all!"

"Haha, what's the point of putting us in? Even Mr. Chen was buried? Mr. Chen, are you convinced?"

"I don't know if Mr. Chen is not convinced. Anyway, I am convinced. Oh my, you said Xiao Feng is only in his early 20s and is not a few years older than my boss. He may be so resistant."

"There is one aspect of being able to do it, and the most rare thing is modesty, which is too rare..."

Feng Xiaochen nodded to everyone and smiled and expressed his humility. At this time, Xiao Xu and Xiao Guo, who had gone to cook, both came over and informed everyone that the meal was ready and that they could enter the table. Everyone surrounded Feng Xiaochen and came to the temporary table, insisting that he sit down in the main seat.

It is said to be a dining table, but it is actually just a triple board used when transporting dump trucks, with ore underneath, which becomes the table where Luo Ye’s team usually eats. The chairs they sit in are genuine, and they are all canvas folding chairs brought by Luo Ye’s team. According to Wang Weilong, these are all made by Luo Ye himself, just to use them when doing field operations.

The temperature difference between day and night in the mining field is large. In order to resist the cold at night, the miners of the cold water mine are accustomed to storing some liquor in the shed. Luo Ye’s team followed the customs and also prepared a lot of liquor. At this time, it happened to be taken out to welcome Feng Xiaochen.

Wang Weilong is the leader of this guy. He stood up first, picked up the wine glass to toast Feng Xiaochen, and said to everyone: "Do you don't know anything? The cold water mine can accept our industrial experiments because of Xiao Feng's golden idea. Have you noticed the stone factory on the mining site? That was when Xiao Feng helped build the cold water mine. Without this stone factory, the cold water mine would probably not accept us until now. I suggest that everyone raise their glasses together and express their sincere thanks to Xiao Feng!"

"Thank you Xiao Feng!"

Everyone picked up the wine glasses and raised them to Feng Xiaochen. Feng Xiaochen quickly got up, raised the wine glasses high, said a few polite words, and then drank the first glass with everyone.

Then, Wang Weilong introduced Feng Xiaochen's negotiations at Pinghe Power Plant, buying meat and eggs for everyone, and the things he taught everyone the finite element analysis just now. Every time he introduced one, he would propose to drink a cup together. After he finally finished introducing it, Feng Xiaochen felt that he was about to be knocked down.

After Wang Weilong sat down, Chen Bangpeng stood up. He also held the wine glass and said to Feng Xiaochen: "Teacher Xiao Feng, I don't call you Director Xiao Feng, but I want to respect you. Teacher Xiao Feng just explained the finite element analysis to us, and it was really good. I have read it many times in the book that I didn't understand. You will understand it as soon as you say it. You are my teacher of Chen Bangpeng. To be honest, I saw you young just now and looked down on you a little bit. Now it proves that I am completely wrong. You don't have to drink this glass of wine. Is it good to be punished and apologized? "

"Mr. Chen, don't say that. You make me feel ashamed." Feng Xiaochen stood up and said, "What teacher is not a teacher? I just learned a little bit of a superficial knowledge. I just made a fool of myself in front of everyone just now. The 120-ton dump truck is a large-scale equipment produced by our country's self-reliance. All the masters of Luoye have made great contributions. Let's do this. I'll toast this glass of wine. How about it?"

Chen Bangpeng patted Feng Xiaochen's shoulder and smiled, "Haha, Xiao Feng is so modest. Your little fur is more than so many of us. Well, since Xiao Feng is so polite, let's do it together!"

After Chen Bangpeng toasted, others began to toast one after another, and they said nothing more than admiration or thanks. Feng Xiaochen did not dare to see the bottom of the cup. He found some reasons to only take a small sip at a time, so he was not put to the ground.

After the toasting ceremony, everyone started to eat dishes. The meat and eggs bought by Feng Xiaochen were used halfway, and a large hen weighing about four pounds, the dishes on the table seemed very rich. Everyone had been vegetarian for several weeks, and finally got a chance to eat meat. They were all greedy, and their eating habits were extremely ugly. Feng Xiaochen was determined not to compete with everyone for food, but Wang Weilong directly brought him a chicken leg, and Chen Bangpeng prepared a large spoonful of braised pork for him, and piled the bowl in front of him with a sharp look, so he could only eat it.

After sweeping the dishes on the table, everyone picked up their glasses again and started drinking and chatting in groups of three or three. Wang Weilong and Chen Bangpeng sat on both sides of Feng Xiaochen, and the person they were talking to naturally chose Feng Xiaochen.

Chen Bangpeng asked, "Xiao Feng, you have just seen our dump truck. Tell me, how is this truck like?"

"It's amazing." Feng Xiaochen responded.

"Is that so? What do you think are amazing?" Chen Bangpeng asked.

Feng Xiaochen said: "Under very simple technical conditions, we mainly rely on our own strength to complete the development of such major equipment with leading significance, breaking the long-term dependence on imports of such equipment. Whether it considers economic benefits or from the perspective of revitalizing the national spirit, it is an amazing achievement."

Chen Bangpeng laughed and said, "Hahahaha, it was indeed from the Economic Commission. It summed up very well, which made us embarrassed."

Feng Xiaochen smiled with her and looked at Chen Bangpeng. He said slowly until Chen Bangpeng stopped laughing:
Chapter completed!