It's a laboratory, but it looks like a 'shed'.

Because the laboratories of Nuoda are all built of simple brick and concrete structures, and the decoration inside is only a layer of white walls pasted with quicklime, and Liu Feng can clearly see the mottled patches on the surrounding walls, which are caused by the red masonry exposed by the weathering of quicklime.

Outside the window, a gust of wind blew, and then there was a burst of rattling sound in his ears, Liu Feng looked up at the sound, it was the roof of the laboratory, which was paved by the aluminum alloy structure similar to the roller shutter door common in the countryside, a gust of wind blew, and the aluminum alloy on the roof rattled straight, which made people wonder if these things would be taken away by the wind.

This is an academician's laboratory?

Liu Feng couldn't believe his eyes.

The conditions were a little rudimentary, which made Professor Liu smile. Academician Ma seemed to know Liu Feng's doubts, and explained with a smile, "This laboratory used to be a warehouse, because it was close to our Haizhou University, and the land price was cheap, so it was bought by the school, but it has not been developed before, and it just so happens that our electromagnetic catapult covers a large area, and I can't afford to build a laboratory building specifically for placing catapults, so I simply applied to the school for this old-fashioned warehouse, which will be used with a simple transformation." Fortunately, the original construction party was strong, and after all these years, there were no major problems except for some weathering of the walls. ”

Liu Feng was really impressed.

If he hadn't seen it with his own eyes, he really couldn't believe that an academician at the level of a national treasure could have made the most advanced aircraft carrier electromagnetic catapult on the earth in such a humble laboratory, although it was only a prototype!

That's how a person can be content with this, not to mention that the conditions are simple or not simple, as long as there is a place for him to experiment, he can be satisfied;

Fortunately, in addition to this 'laboratory', Academician Ma's other laboratories look quite 'gorgeous', whether it is equipment or environment, that is the treatment that academicians should have, otherwise, Liu Feng would have to wonder if Academician Ma offended some big man and was exiled here.

Such a talent is actually treated like this, how can he not let other people feel like a rabbit is dead and a fox is sad and sad?

Shaking his head, Liu Feng didn't care about the environment here.

In fact, although he is a little vain, he is still a figure like Academician Ma in general.

Well, that's right.

Looking up and carefully looking at the overall layout of the laboratory, I found that this laboratory, which was converted from a warehouse, covers an area that is really not small, the size of two basketball courts, and a complete set of prototype units of electromagnetic catapults, with hundreds of thousands of large and small parts placed in it, and there is still enough space left around for a heavy truck to pass through.

"This is the prototype of the 1:1 unit equipment?" Liu Feng asked, staring at the instruments and equipment that filled most of the warehouse.

"That's right,"

Academician Ma nodded, and led Liu Feng directly into the door, followed by two security personnel around him, and walked to a corner of the laboratory.

"Our catapult prototype is mainly composed of two structural modules: the power grid and the electromagnetic transmitter, and now in front of you is the power grid module, which is also a comprehensive power generation system composed of 12 AC and DC double-winding generators, which is used to simulate the power supply facilities on the warship. ”

Liu Feng nodded, he admired this set of Academician Ma's proud works very much, because with his ability, he couldn't even find any place that could be 'deep processing'.

did not bring humiliation on himself, and then, Liu Feng followed Academician Ma to another corner of the laboratory.

"What you're looking at now is the electromagnetic transmitter module. It is composed of a closed-loop motion control system, which is mainly composed of an energy storage system, a pulse power conversion system and a pulse transmitter. ”

His working principle, simply put, when the whole system begins to work, the energy storage system absorbs and stores energy from the grid for a long time with a small power; when the stored energy meets the transmission requirements, once the transmission command is received, it immediately releases energy to the pulse power conversion system; the pulse power conversion system then converts the electric energy released by the energy storage system into the pulse power required for the work of the pulse transmitter, and generates electromagnetic force to promote the movement of the transmitter; and finally the closed-loop motion control system controls the running trajectory of the transmitter in real time to ensure that it is accelerated to the set final speed at the predetermined position to complete the launch task。 ”

While listening to Academician Ma's introduction, he observed the structural layout of the system, and then used it to corroborate with the technical details he got from Academician Ma.

Liu Feng's eyes lit up.

As if inspired, he nodded eventually.

Speaking of which, the technical bottleneck encountered by Academician Ma is not in the power grid and energy storage system, but in the pulse power conversion system and pulse transmitter.

In fact, according to the use of electromagnetic catapults, the length of the launch trajectory and the terminal velocity, Liu Feng knows that electromagnetic emission technology can be divided into three main categories:

The first type is the carrier-based aircraft catapult applied to the aircraft carrier, the launch trajectory length of the pulse launch device is generally not more than 100 meters, its terminal speed can reach the level of 100 m/s (360 km / h), and the maximum weight of the ejection can reach 45 tons.

The other type is the electromagnetic railgun technology that Liu Feng saw before, mainly used for military electromagnetic guns and close defense guns, the length of its launch track is generally within 10 meters, the final speed can reach 3km/s (8-9 times the speed of sound), and the mass of its ejection object is generally about 10 to dozens of kilograms.

As for the third type of electromagnetic thrust technology, it is more sci-fi, mainly used for the launch of spacecraft, the length of its launch orbit is generally at the kilometer level, its final speed can reach 8km/s (the first cosmic velocity), and the ejection mass is generally above the tonnage.

From these three types of electromagnetic emission technology, it can be seen that when discussing electromagnetic emission technology specifically, there is a technical index that needs to be paid attention to, that is, the acceleration G value!

This is a crucial indicator for electromagnetic catapults!

Because, for the average person, acceleration of more than 3G is unbearable, even a trained pilot can only briefly withstand an acceleration of no more than 9G, exceeding the limit may cause short-term or permanent bodily injury or even death.

Therefore, as with all kinds of equipment, there is a limit to the G value, for example, the average civil airliner cannot exceed 2.5 g, otherwise there is a possibility of disintegration and structural damage in the air.

Even fighter jets are quite limited in what they can sustain, for example, the F35 was originally designed to withstand a maximum structural acceleration value of no more than 6.5G.

In the field of electromagnetic emission, because it can achieve a fairly stable acceleration process, its emission process can be approximated to the uniform acceleration process of zero initial velocity in Newtonian mechanics.

According to the corresponding motion formula, the acceleration required during the launch is actually only affected by the length of the launch orbit S and the final velocity V, more precisely, the acceleration is opposite to the orbital length (the longer the orbit, the less acceleration is required), and is proportional to half the average of the final velocity (final velocity) (the greater the required final velocity, the greater the acceleration required, and it increases in a flat manner).

It can be seen from this that the acceleration of the electromagnetic catapult for the aircraft carrier must be below 6G, while the acceleration of the electromagnetic gun and the close defense gun can reach more than 45000G!

Therefore, compared with the steam catapult, the electromagnetic catapult is actually very stable, adjustable, and has a low G-value, which is definitely its most prominent advantage;

However, success is also the same, and so is failure, stable and adjustable, but the low G value definitely tests the design indicators and science fiction degree of the catapult.

On the one hand, it requires a low G value, and on the other hand, it requires a short instantaneous speed, which is a great test for the pulse power conversion system and pulse transmitter, and this is the biggest bottleneck that Academician Ma has not been able to solve!

However, for Liu Feng, he has thought of two ways to improve these problems, of course, whether it can succeed in the end is not certain, he needs to be further familiar with these devices, and be able to simulate the operation of the devices in his mind.

But for now, it seems that he is at least 80% sure.

As time gradually passed, the two stayed in the laboratory for several hours, and finally, before it was getting late, Liu Feng smiled confidently:

"Academician Ma, I heard that country M is building the latest Ford-class aircraft carrier, which also uses electromagnetic catapults; do you know how they solve these problems with the electric bomb equipment of country M?"

Academician Ma was disdainful, and he simply disdained the so-called electric bomb equipment of the M countryman:

"It's not that I'm boasting, even my 1:1 prototype is more than twice as advanced as the electromagnetic catapult index they announced!"

"Oh?" Liu Feng craned his neck and listened.

"Although I don't know where they got the confidence to announce that they would abandon their mature steam catapults and use immature electric bombs on the USS Ford, in my opinion, there must be many ulterior secrets in addition to the pursuit of high technology, the most likely of which is that they are trying to defraud their Congress of funds. ”

"And, as far as I know, their catapults are now facing a lot more problems than ours.

Insiders look at the doorway, laymen look at the excitement, here I summarized 4 major problems.

First of all, the people of country M seriously underestimated the workload and maintenance load brought by electric bombs to the aircraft carrier! It is precisely for this reason that not long ago, I heard that their aircraft carrier USS Ford had changed its original design and expanded the relevant space because of the electromagnetic catapult, and it had been tossing and turning for a long time!

Secondly, there is the problem of ejection stress: the original design index of the M people felt that the use of electromagnetic catapult should be able to effectively reduce the structural stress load of the aircraft during ejection (that is, the g-value discussed above), but in the actual test on land, the main structural stress load of the F/A-18 carrier-based aircraft was increased.

Not long ago, the Navy of Country M found that the design of their USS Ford aircraft carrier could not isolate a catapult for independent maintenance, which seriously reduced the reliability and operational capability of the system.

Finally, there is the problem of reliability: at present, the failure rate of our prototype is 1 in 200, that is, there will be a problem in 200 ejections, while the electric bomb data released by the M people is 1 in 100, and there will be a failure in 100 ejections, which is far from its design target of 4166 times!

Of course, most of these are the data they have published, and after being confirmed by our people, there may be a big difference from the facts, but they will not be much different. ”

Listening to Academician Ma's confident and disdainful tone, Liu Feng suddenly remembered a sentence

- "To be ahead is to be ahead of country M!"

This is a sentence that Academician Ma said when the integrated power system was successfully developed before.

Confident and domineering!

I'm afraid that only such a national treasure-level scientist can say such a thing!

Academician Ma's efforts and talent in scientific research, as well as his knowledge of the most cutting-edge research on both sides of the enemy, cannot but be admired, and he is fascinated.

Although Liu Feng thinks that he can do it, even better than Academician Ma, Academician Ma has no plug-ins!

In addition to Academician Ma, there are only a few scientists of the older generation who occasionally appear in a few ...... For this kind of person, Liu Feng has always admired it from the bottom of his heart.

"It seems that we are creating an unprecedented record," Liu Feng is also arrogant, "The second-generation catapult system of the aircraft carrier, the electromagnetic catapult, will eventually be led by our Huaguo!"

"It seems that Professor Liu is very confident!" Academician Ma said with a smile.

"Of course, how can I live up to Academician Ma's vision?" Liu Feng also smiled, "Then, next, it's up to me to throw bricks and tell me what I think." ”

So, next, Liu Feng elaborated his thoughts in detail, and Academician Ma also listened carefully to Liu Feng's narration, his face full of expectation.

The sun was setting in the west, and the night was getting darker, but neither of them seemed to notice the passage of time, and in the small office next to the laboratory, the discussion continued one after another, and it never stopped.

The staff who were kicked out of the door by the two professors looked at the closed small door, waited from afternoon to evening, and from evening to late at night, then shook their heads helplessly and left.

Only Geng Tang, who was with Liu Feng, and the security guard next to Academician Ma were waiting outside the door.

Seeing the two bigwigs who had never been out of the office, Geng Tang was a little worried: "Old Wei, you said, these two have been in it for a long time, and they don't eat or drink, nothing should happen, right?"

Speaking of which, he and the one next to Academician Ma are also colleagues, but the work they are engaged in is similar in different systems, so when they were waiting outside the door, the two had already formed a relationship.

The comrade named Lao Wei seemed to be a decade older than Geng Tang and had a lot of experience, and he had experienced this kind of thing more than once, so he smiled and encouraged: "Why don't you go in and have a look?"

Geng Tang hesitated for a while, walked to the door, and was about to knock on the door, but suddenly remembered something, and turned around: "But why don't you go?"

Lao Wei smiled: "Because I'm afraid!"

Geng Tang also smiled: "Afraid, what's there to be afraid of?"

Lao Wei: "I'm afraid that I will become a sinner for our country through the ages!"

Geng Tang: "......"

Three words suddenly flashed in my mind - cheat!