Chapter 174 New Issues at the Carbon Research Institute (3k)
The structure of the OSI seven-layer network model that Gao Zhendong studied in his previous life is different. The simple network that Gao Zhendong prepared this time is a bit like what he prepared in his previous life. A private data transmission protocol family implemented in Bishe, which completely abandons the OSI seven-layer model. The application layer is one layer, and further down, except the physical layer, the rest are compressed into one layer, reducing the number of communication layers. Control it on the third floor, as long as you can run.
This is actually closer to the idea of TCP/IP. TCP/IP actually only has four or five layers. It is not clear whether it is four or five layers. Everyone has their own opinions.
The seven layers of OSI are a relatively ideal model. The ideal model has a flaw: it does not pay much attention to reality and is a bit ungrounded. To fully realize these seven layers, to put it simply, some things are superfluous. , a waste of resources.
TCP/IP was born from practical applications. It is more down-to-earth. To achieve more reliable network transmission under the hardware environment and communication resources of the 1970s, we should try to save as much as possible.
Gao Zhendong also has the same idea, and he is even more extreme: as long as he can run, he can use the header information of the telnet and ftp protocols that he has on hand to assist in controlling the handshake and transmission. Others have done it well, and he can use it for his own purposes. Just fine.
The Modem in Gao Zhendong’s hands has a bug in the system. Although everything is based on existing technology, there is a future function that can be implemented using existing technology.
——That is to realize the basic operation control such as dialing of the Modem controlled by the AT command set. Although it is not as complete as the AT command set in the future, the basic part is there.
It is a pity that in the current context of manual exchange of telephones, this thing is of little significance for the time being.
The modem at this time was very troublesome to use. It relied on the sound from the telephone receiver and something called an "acoustic coupler" to work together to successfully connect, and this set of things was already popular even in the West. This is still the case after the program-controlled switching telephone network was installed.
It was not until the 1980s that Heshi Company invented the smart modem, which allowed the computer to directly control Modem dialing mentioned above.
What’s interesting is that one of the famous early hackers was able to dial the Internet simply by simulating a telephone dial tone with his own mouth. He took advantage of this flaw in the acoustic coupler, and that mouth was So awesome.
Just when Gao Zhendong was struggling with network transmission, Yu Yuncheng came to see him. He must have encountered a small problem.
"Director Gao, when we were debugging the temperature measurement system, we found a problem that is not easy to solve."
"What problem, tell me." Gao Zhendong gave them the principle The overall design of the design is relatively complete in big aspects, but it may not be so complete in terms of some small details. It is normal for some small problems to arise.
"As for the temperature measurement problem, the accuracy and precision of the thermocouple temperature measurement are fine. However, because it is on the furnace, the sensitivity is not enough and the response is slower. This thing cannot be sent to the center of the furnace, so it is not easy to solve. For this problem, you made the thermocouple, and I want to see if its sensitivity can be improved."
Gao Zhendong thought for a while, this really can't be solved with the thermocouple that automatically extinguishes the tank fire. , this thing needs to work in a high temperature environment for a long time, but there are still ways.
"In this way, we don't have to think about the thermocouple itself. If the heat can't come through, just ask it to come over. Try using quartz glass as a condenser in front of the thermocouple to concentrate the light in the furnace as much as possible. To the thermocouple, the reaction speed should be improved. It just needs to recalibrate the relationship between the thermocouple temperature and the furnace body temperature.
Yu Yuncheng heard it, eh, this method is good, simple and direct, curve. Director Gao has to solve the problem.
“Haha, this is a good method. You don’t have to waste time and effort on fiddling with thermocouples. Just adding a piece of quartz glass will solve the problem. I’ll try it right away. By the way, Director Gao, people from the Northeast Carbon Research Institute are here and are unloading the goods. Do you want to go take a look? ”
After hearing this, Gao Zhendong put down what he was doing and went to the single crystal furnace laboratory with Yu Yuncheng.
The graphite components, such as heating bodies, electrodes, and insulation covers, contracted by the Northeast Carbon Research Institute for the third rolling mill, have arrived. The graphite heating body and the quartz crucible are basically the thermal field. The main equipment is ready.
This time, it was Duan Gong who escorted the car over in person, which made Gao Zhendong a little surprised. This thing didn't require him to come over in person.
When he saw Gao Zhendong, Duan Gong laughed loudly: "Haha, Director Gao, here I am again! This batch of components of yours was personally taken care of by our dean, and I watched them all the way. The quality is It definitely meets your requirements.”
Gao Zhendong thanked you repeatedly: “Thank you so much. I may bother you more often in the future.”
Graphite components cannot be installed once and for all. Some parts need to be replaced, which is a bit like consumables, so Gao Zhendong said this.
Duan Gong smiled and said: "How can we call it troublesome? Isn't that what we do, haha."
After saying that, he winked at Gao Zhendong.
It seemed like he had something to say, so no wonder he wanted to come over in person.
Gao Zhendong nodded, handed over the unloading, inspection, and installation matters to Yu Yuncheng, and took Duan Gong to his office.
After entering Gao Zhendong's office, Duan Gong talked about his purpose.
"Director Gao, it's just a small matter. It's the Chinese New Year. I went around to find some new year's goods and brought some for you. Haha, it's not a rare thing. I'll ask someone to send it to your home later. "Knowing the style of Duan Gong, who is rough on the outside but delicate on the inside, Gao Zhendong smiled and thanked him. The people who came over there are all good things, and some of them can't be found in his own system.
After talking about this really trivial matter, the next thing Duan Gong said was not a trivial matter.
“The second thing is, I’m here to ask you for help.”
"Ask for help?" Gao Zhendong was a little strange. He had told him thoroughly about graphite before. After thinking about it, by the way, there was also the matter of pyrolytic graphite. Last time he was embarrassed and didn't continue. Keep listening.
It seems that pyrolytic graphite is needed now?
Gao Zhendong smiled and said: "What about pyrolytic graphite? No problem."
But Duan Gong's answer was a bit beyond his expectation. Duan Gong shook his head: "No, It’s a matter of the copper-infiltrated graphite throat lining material. I can’t say where it’s going to be used, but I can tell you the specific situation and relevant parameters. I would like to ask you to give us some advice.”
Gao Zhendong almost laughed out loud. What's the difference between this and what you've already said? Where else can this thing be used?
He also has a certificate of appointment as a technical consultant from the Carbon Research Institute, which is probably why he actually has no scruples when talking about it and is just pretending.
"Well, it's okay. Just tell me what the problem is."
What Duan Gong said is actually very simple.
Gao Zhendong taught them to make a graphite-copper-infiltrated material that has relatively high strength and good ablation resistance, so it is ready to be used in another situation where similar materials are needed.
However, after the test, it was found that the ablation resistance performance dropped significantly. It was washed away by high-pressure airflow and the mechanical erosion was serious. This made them puzzled. According to theoretical calculations, the strength of this material meets the requirements of this usage scenario.
Moreover, it is also very smooth to use on the infrared air-to-air missile of the Institute of Guidance and Research. Even the working pressure difference between the two is not too big. It is said that it will not cause such a degree of performance degradation.
The Carbon Research Institute thought about it and couldn’t find the reason, so it simply took advantage of the opportunity to transport components and came to see Gao Zhendong. First, bring some New Year’s goods to deepen the relationship. Second, come and ask in person. Maybe there is a way.
At least, you have to find out the reason before you can proceed with the next step of research, otherwise you won’t even be able to find the direction.
Gao Zhendong carefully asked about the working conditions when the problem occurred, and he probably felt confident.
"Duan Gong, it sounds like the working hours of your new application have far exceeded the working hours of the Institute's products, right?"
"Well, yes, but it is said that as the working hours increase, the degree of ablation will increase, but the ablation rate, that is, the ablation speed, should be maintained within a certain range, but the current performance is a sharp decline, mainly due to the impact of airflow Mechanical erosion."
Gao Zhendong smiled: "Do you think the mechanical strength of copper-infiltrated graphite is sufficient according to calculations, and this should not happen?"
"Well,? Yes, this is where we scratch our heads. It’s enough, but it will collapse when used.”
Gong Duan, think about it, will copper burn?
"Burn, burn, burn?! Hey, be a good boy, Director Gao, you just woke up the dreamer with just one word!"
When Duan Gong heard Gao Zhendong's simple words, he suddenly understood.
Test the strength of graphite copper-infiltrated material at normal temperature. Since copper is solidified and intertwined with the graphite material, its strength must be very high.
But when it is in working condition, the copper is burned into a liquid. At this time, it only serves as a sweating material, evaporating and taking away heat, and it does not contribute much to the strength.
The rocket engine of the infrared air-to-air bomb has a short working time, so this problem is not outstanding.
But this problem arises in engines that work for a long time. The copper is not completely melted in the early stage, and the work is fine. Later, the copper is completely melted, which resists mechanical erosion caused by high-pressure airflow. Performance is not good.
Duan Gong was dancing with excitement in Gao Zhendong's office: "Haha, Director Gao, thank you so much. Such a simple problem has been bothering us for a long time. Once we find the problem, we can find a way to solve it."
< br>If you can't find the problem, you can't deal with it in a targeted manner. Now that you know the problem, it's much easier to deal with. To put it harshly, the stupidest way is to break through the weight index and make things thicker. It doesn’t burn quickly, so I’ll add more and let you burn it for a while.
(End of this chapter)