Chapter 748 Preliminary tasks of LNG ships
Liu Fangping and Lei Zhixing basically conform to the most traditional portraits of boys majoring in science and engineering.
Although he was very reserved when he first met Chang Haonan, as soon as he talked about things related to the project, he immediately became more relaxed and his nervousness disappeared.
“Professor Chang.”
This time it was Lei Zhixing who spoke first:
“To store and transport liquefied natural gas, the main difficulty in shipbuilding is probably structural safety.”
Mechanics is a broad-based major that can be involved in anything in the material world.
Therefore, although he has not studied the shipbuilding industry in depth and the information at hand is incomplete, he can still get some inspiration from projects he has done in the past.
Chang Haonan did not speak, but stretched out his hand slightly to signal the two of them to continue talking.
Liu Fangping, who was a little clumsy just now, answered this time:
"Most materials, especially metal materials containing iron elements, have highly nonlinear and even discrete characteristics in their performance changes at extremely low temperatures. Structural properties such as strength, plasticity, fatigue life, etc. change greatly and cannot be Design based on experience with general equipment.”
"When I was a PhD student in Stiffness, I followed my mentor to analyze an accident involving cracking and failure of a container in a low-temperature liquid nitrogen storage tank. The cause found at that time was an abnormal increase in strain-induced martensite content caused by cold deformation of austenitic stainless steel, which ultimately led to The head section suffered brittle failure.”
At this time, Liu Fangping drank some water and his complexion returned to normal.
Of course, the “normal” here is the standard for most people.
"Although the temperature of LNG is not as extreme as that of liquid nitrogen. According to data, it is about -60°C in normal high-pressure storage. However, compared with storage tanks on land, ships in navigation are not a good storage platform. Ships There is a high-temperature environment like the power cabin inside. Under normal circumstances, the temperature difference across the ship can be pulled up to 100°C. If we also consider that once the LNG leaks, the low temperature of -168°C will directly impact the hull structure. For the safety factor, Require…"
After saying that paragraph just now, Liu Fangguan's face, which was originally a little dark, turned quite red.
Compared to Lei Zhixing, Liu Fangping's speech rate is slower, but judging from his eyes and expressions, it is obvious that he is thinking while talking, rather than being at a loss like before on the sofa.
Lei Zhixing and Liu Fangping are indeed complementary in many ways.
Lei Zhixing next to him was obviously used to this, still looking down at the documents in front of him.
When talking about areas that he is relatively familiar with, Liu Fangping's speaking speed gradually became normal from the slow pace at the beginning.
Chang Haonan was so frightened that he quickly handed him a bottle of water.
For him, it should be very fast.
"Professor Chang, I think that before going to Hudong, it is best to conduct some preliminary research on the relationship between temperature changes in the elastic body and thermal stress and thermal strain, especially the structural temperature field function, heat conduction equation and The coupling relationship between the thermoelastic equations of motion can then be used to establish a relatively accurate hull structure model. Otherwise, just by going around for a while, I'm afraid you won't gain much.”
“Uh…then take your time?”
"Hmm... But looking at the meaning of this information, it seems that Hudong Shipyard wants to compete with Bang... er, South Korea's Samsung Offshore for the dominance of GTT Group's second-generation cargo tank technology shipping orders. According to them It is estimated that the key time point for this round of competition should be 2002-2003 at the latest. In other words, the plan, or at least the key technology, must be come up before then, and time is not generous..."
When Liu Fangping expressed his opinion just now, he kept nodding beside him, obviously agreeing with the other person's opinion, but at this time he frowned, looking troubled:
Chang Haonan gradually began to understand why Yan Yongnian had to accept two closed disciples at the same time.
Lei Zhixing shook his head while flipping through the information.
“But in terms of time...if we want to start research from scratch, firstly, neither of us has systematically studied thermodynamics in the past, and secondly, studying low-temperature topics requires specialized ultrlow-temperature equipment...I am afraid it will not be easy to solve in a short time.”
Since both his undergraduate and master's degrees are in science, his project experience is obviously not as good as that of the former who has been following Yan Yongnian since his senior year.
However, for the same reason, he is often better at analyzing the essence of the problem:
Of course, the speaking speed has also returned to its previous slow state.
In just a few minutes after getting the information, he had already said more than half an hour before.
Taken individually, they all have quite a few flaws, but when put together they can produce an effect of 1+1 greater than 2.
Chang Haonan himself felt a little sorry that such a pair of live treasures were cut off like this.
So he quickly thanked Yan Yongnian in his heart.
Then he spoke:
“For equipment issues, I can contact the China Institute of Atomic Energy. They should have relatively complete ultrlow temperature research equipment.”
“Is this… from the nuclear industry system?”
Lei Zhixing, who was troubled just now, was obviously not used to the new boss's incredible connections, so he just looked at Chang Haonan in shock.
The latter nodded:
"In the era of planned economy, our country's cryogenic engineering has always been studied by the nuclear industry system. Later, although many universities also opened cryogenic disciplines in energy, machinery or physics majors, the systems were not as complete as theirs, and most of them still stayed in theory or experiment. room research."
"Moreover, it's not just equipment. They should have accumulated some achievements in low-temperature materials science in the past, which should also be meaningful for this project." The leader of the committee, with Chang Haonan's current position in the Science and Technology Committee, it is only a matter of words to use the equipment there.
“As for the starting point of the research…”
Chang Haonan leaned back on the chair:
“I suggest you start with the theory of thermoelasticity, which mainly includes thermodynamic field theory, thermal conductivity and elasticity. For you, especially Teacher Lei, there should be no particularly high threshold.”
Even the research direction has been pointed out. Lei Zhixing and Liu Fangping obviously cannot ask for more.
After all, they are teachers in Chang Haonan's research group, and they are not graduate students under Chang Haonan.
If you still have to feed it into your mouth, all these years of learning will be in vain.
“Professor Chang, the two of us will move to the dormitory here in Beijing Airlines immediately after we return.”
Liu Fangping immediately expressed his position:
“And...if the office is located, it will be with you, right here?”
Chang Haonan nodded:
“The new experimental building of our laboratory is still under construction. Currently we can only work in the computing center. Your two offices are downstairs. I will have people clean them up as soon as possible.”
Yun Danfengqing's answer would be completely different in the ears of other people -
New laboratory building!
You must know that funds in universities have been tight in recent years. Most laboratories, even at the national level, can only use rooms cleared out by others for renovation.
Those who choose to enter colleges and universities these days are basically not materialistic people.
But not being material and not liking matter are two different concepts.
If nothing else, even if you really focus on academics, better material conditions will undoubtedly lead to higher research efficiency.
This point is understood very clearly by Lei Zhixing, who has an engineering background from undergraduate to doctoral degrees.
Foreign researchers can get results that they can just do once or twice, but in their group, it often takes days or even weeks to complete because of insufficient equipment or raw materials.
Unknowingly, research efficiency has been greatly improved.
Thinking of this, he was once again convinced that he had made the right choice.
“Okay, let's try to get on the job tomorrow!”
After sending Liu Fangping and Lei Zhixing away, Chang Haonan also breathed a sigh of relief.
Although he is experienced in projects, this is his first time leading a research team.
The other three are new lecturers, but he is actually also a new professor.
Everyone has little experience and can only fumble around.
“Senior sister.”
Chang Haonan looked again at Yao Mengna, who had been silent just now:
“As for your project, I may have to look for a suitable one...”
The latter waved his hand:
“It's not urgent. It just so happens that there is still some finishing work on the capacity ramp-up project of Project 11 over at 112 Field. I have to go to Shengjing in the next two months. As long as I have something to do after the start of the next semester.”
“That must be no problem.”
The fall semester starts in September. More than two months are enough for Chang Haonan to complete a project. Finding a project for Yao Mengna will be a piece of cake.
“Speaking of…”
Yao Mengna changed into a relaxed tone:
“You just said that we have a new laboratory building, but I have been at school these two days and I don't seem to have seen any groundbreaking for that building?”
“Of course not in the current campus.”
Chang Haonan smiled and explained:
“Beijing City has specially approved a piece of land for our laboratory outside the North Fourth Ring Road to build a joint school-enterprise experimental center, covering an area of about one hundred acres.”
Yao Mengna's eyes suddenly widened.
(End of this chapter)
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