Chapter 741 Model Testing (Second Update)
"I'll go and see it 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 of the film and television city have been beautified to a certain extent, such as the emperor's bedroom is taller and larger, so that it looks good in the photos.
Because the interiors of these palaces do not have residential properties, people who have lived in the north know that the larger the room, the more difficult it is in winter.
The courtyard houses you see in TV dramas, are each room very large in reality? In fact, most of the rooms in the courtyard houses are just like that. The courtyard house where Liu Hai lives used to be where the rich and powerful lived, and they knew exactly how big the rooms were.
Liu Hai also saw a report that the number of helicopter exports in my country hit a record high last year. Of course, this number is not very large, only more than 1,300.
After reading the news, Liu Hai came to the fighter research and development department, or more accurately, the fly-by-wire system control under the fighter research and development department.
The fighter fly-by-wire research and development department is also in the motorcycle factory, an inconspicuous square building.
Entering this department, you can see a huge test site.
A model of an aircraft skeleton was built on the test site, and this aircraft skeleton is exactly the same as the designed fighter skeleton.
Although Liu Hai could produce a detailed design drawing of the fly-by-wire system, he did not do so.
It is necessary for testers to test little by little, and through the test data, they can find out where and what control equipment should be installed, such as pressure sensors, temperature sensors, and control units that control the wing rudders. The size of the control unit must be obtained through experiments.
Because it is necessary to ensure that the motor has sufficient control power, after all, the supersonic flight of fighter jets requires 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 one 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? Then there must be a sensor.
This sensor can be a mechanical gear controller, that is, the wing will trigger the mechanical gear at a certain angle.
This mechanical gear will be connected to a chip controller, and this chip controller will be connected to the control chip of the control unit motor. If the motor control is an angle of five degrees, and the gear of the mechanical sensor is ten degrees, if these two data conflict, an alarm will be triggered.
If the two data are consistent, then there will be no alarm.
Of course, in order to ensure safety, there will be an independent sensor, which is a pure display.
If the pilot receives a system warning, he will look at this independent sensor and make a judgment.
This is still a simple wing control unit, and there are many control units on the entire aircraft.
Each control unit needs this multiple safety system.
The fighter pilot controls the joystick in his hand, and the onboard computer will read the data of the joystick to determine the pilot's intention, such as the pilot wants to pull the plane up.
Then the computer will issue commands to each control unit of the aircraft based on this data.
To put it bluntly, the fly-by-wire system is to let the onboard computer understand the pilot's intention, and then understand the current state of the aircraft and how to control it to achieve the pilot's intention.
It sounds simple, but the data model of this fly-by-wire system, this data model must be supported by a lot of test data.
In addition, it is also a test of related sensors and control unit components.
"Engineer Liu!" Liu Hai, who works in a department like this, comes once a week at most, because data collection and data 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, which showed an optimized drawing of a control unit.
Because there are many other control units in the wing control surfaces of the aircraft, such as how many control units should be used for a wing, and how much power should be used. If there are two control units at the beginning, it is found that the two control units are not suitable in the subsequent continuous testing, and one more control unit needs to be added.
Or the two control units may fail in some 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, just test it according to this." Liu Hai can't remember how many times this has been changed, because sometimes it is not his department's business, but other departments have changed the drawings, so the control unit has to move.
Because the fighter's wing is not only a fly-by-wire system, but also many systems, such as the suspension system for hanging missiles. When the design drawings of other departments need to be changed, this department sometimes has to change them too.
Fighter design is a very comprehensive job, and it is most suitable for this project to affect the whole 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 test process of the fly-by-wire system on the entire aircraft frame.
The fly-by-wire system has not been completed yet, it is still just a basic framework, so when the test personnel are operating in the front, there may be some other problems later.
The scene is densely packed with lines, these lines are connected to various instruments, these instruments display the working conditions of each part of the fly-by-wire system, and there is also a computer that displays the data of each sensor and control unit of the aircraft in real time.
The current fly-by-wire system is extremely unstable. There may be no problems in the last test, but problems will arise in the next test.
The main thing is to make the onboard computer understand the pilot's intention, 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.
Make sure the test data is correct.
The fly-by-wire system of a fighter 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 test personnel were now controlling the aircraft in the state of pulling up, but there was a data conflict in the control unit, which caused the control unit to respond incorrectly.
The person in charge looked at Liu Hai with an awkward smile, and then immediately went to find the problem.
If the onboard computer simply controlled one control unit, it would be very simple, but the onboard computer had to control many control units and make these control units coordinated, which was difficult.
As for the problem of the control unit response, I didn't find out where the problem was in the morning.
Because sometimes the problem is very strange, sometimes it is not a software problem at all, but a hardware problem.
Before you find the real problem, you can't think of where the problem is.
Liu Hai is still relatively relaxed. Anyway, he just watches everyone work. If these people have no mistakes in the general direction, Liu Hai generally won't say too much.
Let them toss it themselves. Anyway, in a general direction, they can't make many mistakes, and these mistakes are also very useful.
Just like in material testing, although 99.99% of the tests fail, when enough data is accumulated, this is a huge wealth.
At noon, I had lunch in this department. Liu Hai didn't like meetings or talking during meals.
Eating was originally 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 also used to it.
Liu Hai didn't have a break at noon today, and came to teacher Zhu Haiyang.
Shaftless water jet propulsion is now black technology, and a simple model manufacturing has been tossed several times.
There are many things involved in shaftless water jet propulsion, first of all, the sealing problem, and then the problem of water pressure at different water depths.
Even the temperature change of water affects the material structure.
This is just a simple aspect, not to mention the control of the entire shaftless water jet propulsion and so on.
"Xiao Hai, you are here." The team led by Zhu Haiyang has more than 600 people, divided into nearly 20 groups. Even Zhu Haiyang feels that there are not enough people, because shaftless water jet propulsion involves too many things.
Often, new departments need to be added continuously during the research process.
To be honest, Liu Hai is not proficient in this area, and he has only seen some papers in some academic journals on aircraft carrier space.
Besides, the shaftless water jet propulsion is the most advanced high-tech of the big black fish in various countries, and it is impossible to take out detailed data.
And even if the detailed data is taken out, it may not be appropriate, because the power and appearance of the shaftless water jet propulsion are also closely related to the big black fish itself, just like the parameters of different car engines and the parameters of various systems 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 various problems have occurred during the test.
Because it is not only a design problem, but also processing and material problems must be considered.
Our current big black fish also has a high back, and Fei Xiong solves this big black fish's back simply and crudely.
That is to make the big black fish bigger. Fei Xiong directly puts two submarines side by side, and then makes a larger submarine, and the gap between the two submarines is used to install submarine-launched missiles.
Moreover, Fat Bear is rich and powerful, and directly uses titanium alloy to manufacture the big black fish.
Fat Bear's weapon manufacturing concept is to pile up materials, stainless steel aircraft, titanium alloy submarines.
Not to mention that stainless steel aircraft was a nightmare for the West before it was discovered by the bald eagle.
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. In addition, the Tornado-A radar is also the same, so the fighter must use uniquely developed alcohol to achieve the cooling effect.
The stainless steel fighter has two alcohol tanks built in, one is pure alcohol and the other is a solution of 49% alcohol distilled water. During high-speed flight, it can be used as a coolant to cool the fuselage and radar system and reduce failures.
However, everyone knows that people on the Feixiong side like to drink, so this kind of alcohol certainly cannot escape the hands of Feixiong pilots and ground crew.
Although the Feixiong official has thought of many ways, there is no way to stop it.
Feixiong pilots like to fly MiG fighters very much, because there is alcohol in the antifreeze of MiG fighters. Although the official has added various things to it, the pilots have summed up the experience that there is no problem if they do not drink more than 5 cups a week.
Of course, this stainless steel plane is not pure stainless steel, and it is also silver-plated.
Liu Hai looked at the model, which has a diameter of only one meter.
"Based on the experience of the last failure, we continue to study and change it, and we don't know what the results of this test will be." Zhu Haiyang looked at the thing in front of him, and it was 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 the performance parameters." Liu Hai did not say perfect things, because there is no perfect thing in the mechanical field. With the development of the times, it seems that perfect things will always be replaced.
"Haha, you are very good at comforting people." Zhu Haiyang laughed. He was very happy that he could study this kind of product that 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 no progress after failure.
As long as there is progress, it means that there will be victory.
"I think so when I do research myself." Liu Hai replied with a smile.
While the two were talking, the factory director also came, and the deputy factory director in charge of military industry also came.
In fact, the deputy factory director in charge of military industry has been keeping an eye on this project because this project is too high-tech.
Although it was not researched by himself, if such a high-tech thing can appear during his tenure, he will also be remembered by history.
Of course, the superior department is also keeping a close eye on this project. As long as Zhu Haiyang has difficulties in this project, they will immediately send someone to solve it.
It can be said that the hundreds of 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 the superiors is for.
"Leader!" Liu Hai greeted the two leaders.
"Xiao Liu!" Sun Aiguo directly called Liu Hai Xiao Liu.
"Engineer Liu!" The deputy director in charge of military industry respectfully called Engineer Liu.
"Engineer Zhu!" The two called Zhu Haiyang Engineer Zhu at the same time.
"The two leaders came to observe in person, and I am under a lot of pressure." Zhu Haiyang also laughed and joked. In fact, these two leaders come every now and then.
"We are just a spectator, don't pay attention to us." Sun Aiguo waved his hand and said.
"Then I will start preparing for the test?" Zhu Haiyang prepared to start the test.