Courtyard light

Chapter 741 Model Testing (Second Update)

"I'll go and have a look in the summer." Liu Hai is still looking forward to the establishment of the film and television city.

Because to a certain extent, the buildings in the film and television city have been beautified. For example, the emperor's bedroom is taller and bigger, so that it looks better when photographed.

Because the interiors of these palaces are not habitable, people who have lived in the north know that the larger the room, the more difficult the winter.

The courtyard houses you see in TV dramas, are the rooms in reality very big? In fact, the rooms in most courtyard houses are just like that. The slum where Liu Hai lives was once where the powerful and wealthy lived, and it is clear how big the rooms inside are.

Liu Hai also saw a report that my country's helicopter exports hit a record high last year. Of course, the number is not very large, only more than 1300.

After reading the news, Liu Hai came to the fighter jet research and development department, or to be more precise, the fly-by-wire system control under the fighter jet research and development department.

The fighter fly-by-wire research and development department is also located inside the motorcycle factory, in an inconspicuous square building.

Once you enter this department, you can see a huge testing site.

A model of an aircraft frame was built on the test site, and this aircraft frame is exactly the same as the designed fighter frame.

Although Liu Hai could produce detailed design drawings of the fly-by-wire system, he did not do so.

This requires test personnel to conduct tests bit by bit, and use the test data to determine where and what control equipment should be installed, such as pressure sensors, temperature sensors, and control units that control the wing control surfaces. The size of the control unit, all of these data must be obtained through experiments.

Because it is necessary to ensure that the motor has sufficient control force. After all, supersonic flight of fighter jets requires very high control.

In addition, there must be an error correction function. For example, in a certain action, the angle of the wing can only be controlled at a certain angle. If the angle is too large or too small, it will cause catastrophic consequences. So how can the pilot intuitively see whether the angle is correct? Therefore, a sensor is required.

This sensor can be a mechanical gear controller, which means that the wing will trigger the mechanical gear at a certain angle.

The mechanical gear position will be connected to a chip controller, which will be connected to the control chip of the control unit motor. If the motor control angle is five degrees and the mechanical sensor gear position is ten degrees, an alarm will be triggered if the two data conflict.

If the two data are consistent, no alarm will be issued.

Of course, in order to ensure safety, there will also be an independent sensor, which is purely for display.

If the pilot receives a system warning, he will look at this independent sensor and make a judgment.

This is just a simple wing control unit, but there are many control units on the entire aircraft.

Every control unit requires this multiple safety system.

The fighter pilot controls the joystick in his hand, and the onboard computer reads the data from the joystick to determine the pilot's intentions, such as whether the pilot wants to pull the plane up.

The computer will then issue commands to each control unit of the aircraft based on this data.

To put it simply, the fly-by-wire system is to allow the onboard computer to understand the pilot's intentions, and then understand the current state of the aircraft and how to control it to achieve the pilot's intentions.

It sounds simple, but the data model of the fly-by-wire system requires a lot of test data to support it.

In addition, a test is also carried out on related sensors and control unit components.

"Engineer Liu!" In a department like this, Liu Hai comes once a week at most, because data collection and optimization are very cumbersome and slow. The head of this department quickly picked up a piece of paper.

Liu Hai looked at the piece of paper in his hand, on which was an optimized drawing of a control unit.

Because the aircraft wing control surfaces and other control units have many other control units. For example, how many control units are needed for one wing and how powerful the control unit should be. If there are two control units at the beginning, it may be found in subsequent continuous testing that two control units are not suitable and another one needs to be added.

Or the two control units may fail in certain extreme cases, so the two control units should be designed to be larger.

Don't underestimate the change of a control unit, because it involves the overall circuit, various sensors, power supply, etc.

"Well, let's test it according to this." Liu Hai couldn't remember how many times this had been changed, because sometimes it was not his department's business, but other departments changed the drawings, so the control unit had to be moved.

Because the fighter jet's wing contains not only this fly-by-wire system, but also many other systems, such as the suspension system for hanging missiles. When the design drawings of other departments need to be changed, this department sometimes also needs to make changes.

Fighter jet design is a highly comprehensive job, and this project is most suitable for the concept of "one move affects the entire body".

The person in charge was relieved when he saw that Liu Hai didn't say anything. He had no idea that Liu Hai already knew the complete design drawings, but when he presented them himself, no one could learn anything.

Liu Hai carefully observed the testing process of the fly-by-wire system on the entire aircraft frame.

The fly-by-wire system is not yet complete and is just a basic framework, so when the testers are operating it in the front, some other problems may arise later.

The scene is filled with dense wires connecting various instruments that display the working conditions of each part of the fly-by-wire system. There is also a computer that displays the data of the aircraft's current sensors and control units in real time.

Today’s fly-by-wire systems are extremely unstable. There may not be any problems in the last test, but problems may arise in the next test.

The main thing is to make the onboard computer understand the pilot's intentions, release signals to various control units, and make these control units cooperate with each other.

This is a very boring process, dealing with these experimental data every day.

It is imperative that the test data is correct.

The fly-by-wire system of a fighter jet is much more complicated than that of a civil airliner. First of all, the speeds of the two are different. The higher the speed, the higher the requirements for the system's response time and accuracy.

Less than two minutes into the test, a beeping sound was heard. Liu Hai saw on the computer screen that the tester was now controlling the aircraft to ascend, but there was a data conflict in the control unit, causing the control unit to respond incorrectly.

The person in charge looked at Liu Hai with an awkward smile, and then immediately went to look for the problem.

If the onboard computer simply controls one control unit, it is very simple, but the onboard computer has to control many control units and make these control units coordinate with each other, which is the difficulty.

As for the control unit response problem, we still haven't figured out what the problem is this morning.

Because sometimes the problems are very strange, and sometimes they are not software problems at all, but hardware problems.

You have no idea what the problem is until you find out the real problem.

Liu Hai is relatively relaxed. He just watches everyone work. If these people are not making any general mistakes, Liu Hai generally doesn't say much.

Let them work on their own. After all, they can’t make too many mistakes in a general direction, and these mistakes are also very useful. Just like in material testing, although 99.99% of the tests fail, when enough data is accumulated, it is a huge wealth.

We have lunch in this department at noon. Liu Hai doesn’t like attending meetings or talking during meals.

Eating is everyone's free time, so after Liu Hai finished eating, he put the plate back, wiped his mouth and left.

People in these departments are not surprised.

Liu Hai didn’t have any rest time at noon today, so he came to his teacher Zhu Haiyang.

The shaftless water jet propulsion system is now a black technology, and it took several efforts just to make a model.

There are many things involved in shaftless water jet propulsion. The first is the sealing problem, and then the problem of water pressure at different water depths.

Even changes in water temperature affect the material structure.

This is just the simple aspect, not to mention the control of the entire shaftless water jet propulsion system and so on.

"Xiao Hai, you're here." The team led by Zhu Haiyang already has more than 600 people, divided into nearly 20 groups. Even Zhu Haiyang feels that the manpower is not enough, because the shaftless waterjet propulsion involves too many things.

Often new departments have to be added during the research process.

To be honest, Liu Hai is not proficient in this area. He has only read some papers in some academic journals on the aircraft carrier space.

Besides, the shaftless water jet propulsion system is the most advanced high-tech of various countries, and it is impossible to provide detailed data.

Moreover, even if the detailed data is available, it may not be appropriate, because the power and appearance of the shaftless water jet propulsion system are also closely related to the big black fish itself, just like the parameters of car engines of different sizes, and the parameters of each system are different.

"Come and take a look at our latest model." In Zhu Haiyang's mind, his student and son-in-law is a genius among geniuses.

In fact, the model has been made many times, but problems of one kind or another occurred during testing.

Because it is not just a design issue, but also processing and material issues must be considered.

The big black fish we have now has a high back. Fat Bear solved the problem of the back of the big black fish in a simple and rough way.

That is to make the big black fish bigger. Fat Bear directly puts two submarines side by side, and then makes a bigger submarine. The space between the two submarines is used to install submarine-launched missiles.

Moreover, Fat Bear is very rich and can directly use titanium alloy to make the big black fish.

Fat Bear’s weapons manufacturing concept is to pile up materials, stainless steel planes, and titanium alloy submarines.

Not to mention that before stainless steel aircraft were discovered by the bald eagle, they were simply a nightmare for the West.

When a stainless steel fighter is flying, once the speed increases, the temperature of the fuselage surface will rise rapidly due to friction with the atmosphere. The same is true for the Tornado-A radar, so the fighter must use uniquely developed alcohol to achieve the cooling effect.

The stainless steel fighter has a total of two built-in alcohol tanks, which contain pure alcohol and a solution mixed with 49% alcohol distilled water. During high-speed flight, they can be used as coolants to cool the fuselage and radar system and reduce malfunctions.

But everyone also knows that people on Fat Bear's side like to drink, so this kind of alcohol will certainly not escape the hands of Fat Bear's pilots and ground crew.

Although the Feixiong officials have thought of many ways, they are unable to stop it.

Fat Bear pilots like to fly MiG fighters very much. That's because the antifreeze of MiG fighters contains alcohol. Although the official has added various things to it, the pilots have summed up their experience and there will be no problem if they do not drink more than 5 cups a week.

Of course, this stainless steel plane is not pure stainless steel, it is also silver-plated.

Liu Hai looked at the model, which was only one meter in diameter.

"Based on the experience of the last failure, we continue to study and make changes. We don't know what the results of this test will be." Zhu Haiyang looked at the thing in front of him and found it hard to imagine that this was a thruster.

"Teacher, failure is not terrible. What is terrible is that you cannot find the reason for failure. As long as there is progress, one day you will be able to make products that meet performance parameters." Liu Hai did not say something perfect, because there is no perfect thing in machinery. With the development of the times, it seems that perfect things will always be replaced.

"Haha, you are good at comforting people." Zhu Haiyang laughed. He was very happy that he could research this kind of product which seemed not to appear in this era, especially that he kept making some progress.

People who do research know that they are not afraid of failure, but they are afraid of making no progress after failure.

As long as there is progress, it means victory will be achieved.

"That's what I thought when I was doing my own research." Liu Hai replied with a smile.

While the two were talking, the factory director arrived, and the deputy factory director in charge of military industry also arrived.

In fact, the deputy factory director in charge of military industry has been keeping an eye on this project because it is too high-tech.

Although I didn't research it myself, I will be remembered by history if such a high-tech thing came into being during my tenure.

Of course, the higher authorities are also keeping a close eye on this project. As long as Zhu Haiyang encounters difficulties with this project, they will immediately send someone to solve it.

It can be said that the several hundred people in Zhu Haiyang's project are only a part of it, and more are distributed in other research institutes across the country.

Of course, these research institutes do not know what the research task assigned by their superiors is for.

"Leaders!" Liu Hai greeted the two leaders.

"Xiao Liu!" Sun Aiguo directly called Liu Hai Xiao Liu.

"Engineer Liu!" The deputy factory director in charge of military industry respectfully called Engineer Liu.

"Engineer Zhu!" The two of them called Zhu Haiyang "Engineer Zhu" at the same time.

"Since the two leaders came to observe in person, I feel quite pressured." Zhu Haiyang also laughed and joked. In fact, these two leaders came every now and then.

"We are just spectators, don't mind us." Sun Aiguo waved his hand and said.

"Then I'll start preparing for the test?" Zhu Haiyang prepared to start the test.

(End of this chapter)