Guessing that what Professor Qian and others are doing now is likely to be the project of the Nanpu Bridge, Li Huayong made up his mind that he must be mixed with a lever in this project.

Of course, Li Huayong's thoughts are very normal, and the saying of "Jinqiao Yinlu" in these years is not in vain, the so-called soldier who does not want to be a general is not a good soldier, and the contractor who does not want to work as a bridge must not be a good contractor. Since he has chosen such a development path in this life, Li Huayong has tried every means to enter the bridge field.

It's a pity that he hasn't encountered similar projects before, and he doesn't even have a decent opportunity, after all, he used to be mixed with Huajian Ninth Bureau, and although Huaxia Construction General Manager is considered to be a leader in the field of civil construction, but in the field of roads and bridges, especially in the field of bridges, their heritage and strength are still poor.

As we all know in the industry, our country's two trump card armies in bridge construction, one is the bridge bureau of China Railway, and the other is the second harbor bureau of CCCC. Now it is rare to encounter such an opportunity, and Li Huayong certainly does not want to let it go.

It must be pointed out that Li Huayong did not think of taking over this project at this time and doing it himself, not to mention that this idea is unrealistic, even if this job is handed over to him, with the resources he has at hand now, he does not have the strength and background. The meaning of the so-called "mixed into one" is: find a way to brush up on such a project, meet some people, and preferably make some friends, so as to prepare yourself for entering the field.

It was with such a purpose that Li Huayong chatted with Professor Qian Zhengying.

"Professor Qian, what kind of bridge is this to be so solemn, and it is a subject to tackle key problems, or is it necessary to make such an exaggeration when it is a joint research project of major universities?"

"Hehe, this time our city is preparing to use new technology to build a bridge that has not been repaired in China, and is ready to use the suspension ... Xiao Li told you this, this time to repair the bridge, the river is not ready to repair the piers, on both sides of the river to build two bridge piers, and then the whole bridge body with the kind of high strength of the steel cable to pull it, you can think about it, this type of bridge of course on the technical requirements is relatively high, and we are ready to repair the bridge is still relatively long, after repairing its span in the world of the same type of bridge can rank third, so it is still necessary to organize joint research. ”

Li Huayong was happy in his heart, of course he could hear that Lao Qian was taking care of his identity as a "high school student", so there was not a single professional term in his words, he was using the most easy-to-understand language to popularize science with himself.

"By the way, you just said that the key topic of our school is building wind resistance, should such an advanced bridge also consider this problem?"

In the face of Li Huayong, who is like a curious baby, Lao Qian did not feel impatient, on the contrary, as a real research-oriented scholar, he is very willing to popularize science to people like Li Huayong:

"Yes, so much, this.... Xiao Li, you should know about resonance, right? You should have learned this in middle school, but what you may not know is that the resonance phenomenon is very important for a bridge, and this phenomenon is extremely harmful to the bridge. ”

"Hehe, the bridge Professor Qian said should be the Tacoma Narrows Bridge in the United States, right?"

Lao Qian was immediately impressed by Li Huayong: "Yo, Xiao Li, your knowledge is quite wide? haha, but it's normal to think about it, since you were able to refute Dr. Kong speechless that day, you know that this bridge is too normal, you are right, although there may be many bridges that have been shaken down by resonance, but this should be the most famous, the accident of this bridge has now become a topic that cannot be bypassed by modern engineering, and the collapse of this bridge has also made aerodynamics and resonance experiments a compulsory course in architectural engineering." For example, if we hadn't collapsed this bridge, we probably wouldn't have my lab, haha. ”

It can be said that until this time, Professor Qian is still talking to Li Huayong in a popular science tone, and Lao Qian made sure that his words could be understood by an ordinary middle school student. His "impressive" view of Li Huayong is limited to the level of "well-informed".

However, in the next moment, when a professional term came out of Li Huayong's mouth, this made him really impressed, and at the same time, it also refreshed Lao Qian's understanding of Li Huayong again.

"Yes, I heard that the collapse of the Tacoma Bridge was caused by Carmen Vortex Street, tsk, who would have thought that such beautiful whirlpools would be the culprit of the collapse of the bridge. ”

"Yes, yes, that accident must have something to do with the Carmen vortex phenomenon... Huh, Xiao Li is good, you actually know Carmen Vortex Street, you, how do you know this thing?"

At this time, you can't blame Lao Qian for being surprised, if Li Huayong knows about the collapse of the Tacoma Bridge, including his debate with Dr. Kong that day, what Li Huayong showed is not a profound knowledge after all, it will only make people feel that he is well-informed and knowledgeable.

However, "Carmen Vortex Street" is different, this is real professional knowledge, even deeper professional knowledge, it can be said that in addition to related majors, even if most undergraduates have heard this term, it is limited to the level of popular science, and to understand its principle, it must be a master's degree or above.

Li Huayong also felt a little overdone at this time, if it was not good to return the old money, he was in a hurry:

"This, I heard that this phenomenon was discovered by von Kármen, so it is called "Carmen Vortex Street", and this Mr. von Kármán is not the mentor of Mr. Qian Xuesen in our country, so I ...... it."

"Haha, that's right, Feng Kármán is indeed Qian Xuesen's mentor.....

Hearing this, Lao Qian was relieved. What is Kármán Vortex Street? It's a physical phenomenon, a physical phenomenon in aerodynamics or fluid mechanics. This phenomenon was discovered by Mr. Qian Xuesen's mentor von Kármen, so it was called "Carmen Whirlpool Street". And because of Mr. Qian Xuesen, many ordinary people know about Von Kármán, after all, the words "this guy can top five divisions alone" came from this person's mouth.

So gossip is sometimes a good thing, Li Huayong wants to explain why he knows about "Carmen Vortex Street", as long as he uses such roundabout gossip, he will soon let Lao Qian be relieved.

After Lao Qian was "relieved", the communication between the two was naturally smoother. Although this "smooth" is just Li Huayong's own opinion, Li Huayong doesn't know what Lao Qian thinks in his heart.

However, Li Huayong was originally chatting with Lao Qian about related topics with an attitude of "set almost", he tried his best to pull on the bridge, and he couldn't care if Lao Qian was tired of talking.

But soon, Li Huayong found an opportunity, and it was in this small talk with Lao Qian that he found an opportunity to meddle in this project.

The problem begins with the collapsed Tacoma Narrows Bridge in the United States.

"What are you talking about! Carmen Vortex Street is the culprit behind the collapse of the Tacoma Bridge? This has been settled abroad? Really, really, it has really been decided?"

When Professor Qian Zhengying said this, he looked at Li Huayong with excitement.

And Li Huayong also looked at Lao Qian with a surprised expression.

At this time, Li Huayong secretly complained in his heart, he said in his heart that he would not do it? Lao Qian is also a future academician of the Academy of Engineering, so he doesn't even know this? Isn't this common knowledge in the engineering circles? Even people who are not specialized in this direction know it clearly. Did you ever run into a pseudo-academician like Dr. Kong?

But with his understanding of old money in his previous life, he doesn't seem to be that kind of person?

Just when Li Huayong was a little messy, he reorganized his thinking, especially when he recalled the classic case of the Tacoma Narrows Bridge in the United States, he slowly understood and figured out some things. And after he figured it out, a smile appeared on the corner of Li Huayong's mouth.

That's right, although the Tacoma Narrows Bridge in the United States collapsed in 1940, it has been more than 40 years since now, and later everyone knows that the reason for the collapse of the bridge is because of the resonance phenomenon, and Carmen Vortex Street is the culprit, which has formed a consensus in the engineering community in later generations.

However, it is not a matter of overnight for humans to fully understand this matter, and it has taken quite a long time for scientists to completely solve this problem, which is a rather long process.

How long is that? It's been more than 40 years, and the research is going on in two phases.

In the first stage, counting from the date of the collapse of the bridge, especially from the late 40s of the 20th century, the engineering community has conducted a lot of analysis and experimental research on the causes of the wind damage accident of the Tacoma Narrows Bridge.

There were two points of view at the time. One view is that the vibration of the Tacoma Bridge is similar to the flutter of the wing, which is a kind of wind-induced torsional divergent vibration, and the other view is that the main girder of the Tacoma Bridge is an H-shaped section with obvious vortex shedding, so it is a vortex-induced resonance.

The two points of view are arguing with each other, and this debate is almost 20 years, which is also considered to be the first phase of research. At this time, everyone has recognized the harm of "resonance", but what form of "resonance" is still unclear to mankind.

It was not until 1969 that the scientist Scanlon() proposed the theory of separation flow flutter of blunt body sections, successfully explained the wind damage mechanism of the Tacoma Bridge, and thus laid the theoretical foundation for bridge flutter analysis, and everyone slowly formed a consensus.

Please note that at this time, everyone only formed a consensus, and the problem was not fully understood, and everyone continued to study along this path, and it was not until the 80s, that is, in recent years, that the basis of this was fully understood abroad.

Considering the current situation in China, Lao Qian's research is a few years behind that of foreign countries, which is of course very normal.

After thinking about this, Li Huayong smiled in his heart. "Goldfinger", I seem to have another chance to open a goldfinger. At the same time, Li Huayong was also a little funny in his heart, why did his golden finger always seem a little special? It seems that few seniors have opened a golden finger like himself.

"But anyway, the gold finger I opened seems to be very high. ”

Li Huayong thought with a little smugness.