Chapter 748 Preliminary tasks of LNG ships
Liu Fangping and Lei Zhixing basically fit the traditional portrait of boys majoring in science and engineering.
Although Chang Haonan was very reserved when he first met him, 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.”
"Although the temperature of LNG is not as extreme as that of liquid nitrogen, according to data, it is about -60C under normal high-pressure storage conditions. However, compared with storage tanks on land, a sailing ship is not a good storage platform. Inside the ship There is also a high-temperature environment like the power cabin. Under normal circumstances, the temperature difference across the ship can be pulled up to 100 degrees Celsius. If we also consider that once the LNG leaks, the low temperature of -168 degrees C will directly impact the hull structure, and the safety factor is required... "
In just a few minutes after getting the information, he had already said more than half an hour before.
Compared with 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.
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:
"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.”
When talking about areas he was relatively familiar with, Liu Fangping's speaking speed gradually changed from slow at the beginning to normal.
Of course, “normal” here is the standard for most people.
For him, it should be very fast.
After he finished speaking the paragraph just now, Liu Fangping's originally dark face turned quite red.
Chang Haonan was so frightened that he quickly handed him a bottle of water.
Lei Zhixing next to him was obviously used to this, still looking down at the documents in front of him.
When Liu Fangping expressed his opinion just now, he kept nodding beside him, obviously agreeing with the other party's opinion, but at this time he frowned, looking troubled:
"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 ultra-low-temperature equipment...it may not be easy to solve in a short time. "
"Uh... then take your time?"
At this time, Liu Fangping drank some water and his complexion returned to normal.
Of course, the speaking speed also returned to its previous slow state.
"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 their estimates, 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 the time is not generous..."
Lei Zhixing shook his head while flipping through the information.
Chang Haonan gradually began to understand why Yan Yongnian had to accept two closed disciples at the same time.
Lei Zhixing and Liu Fangping are indeed complementary in many ways.
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 bit sorry for such a pair of live treasures being cut off like this.
So I quickly thanked Yan Yongnian in my heart.
Then he spoke:
"For equipment issues, I can contact the China Institute of Atomic Energy. They should have relatively complete ultra-low temperature research equipment."
"This... is... 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 to this project."
The former Nuclear Industry Corporation has now been split into two, but it still accepts the leadership of the Science and Technology Commission in terms of business. With Chang Haonan's current position in the Science and Industry Commission, it is only a matter of words to use the equipment there.
"As for the entry point for 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, and it is obviously impossible for Lei Zhixing and Liu Fangping to ask for more.
After all, they are teachers in Chang Haonan's research group, not graduate students under Chang Haonan.
If you still have to feed it into your mouth, then all these years of learning will be in vain.
"Then Professor Chang, the two of us will move to the dormitory here on Beijing Airlines immediately after we return."
Liu Fangping immediately expressed his stance:
"Also...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 sounded completely different to other people's ears——
New laboratory building!
You know, funding in universities has 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 material are two different concepts.
If nothing else, even if you really focus on academics, better material conditions will undoubtedly bring higher research efficiency.
Lei Zhixing, who has an engineering background from his undergraduate degree to his Ph.D., understands this very clearly.
Foreign researchers can get results by just doing it 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 stretched so far.
Thinking of this, he was once again convinced that he had made the right choice.
"Okay, then 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.
"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 112 over at the th 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 which..."
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 see any groundbreaking on that building?"
"Of course not in the current campus."
Chang Haonan explained with a smile:
"The capital 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.
