Chapter 977 Mr. Gao flips the documents? Then we will feel relieved (2 chapters left tonight)
"Oh! Chief Engineer Gao is really amazing, you can guess this. That's it! Because of solar power and photography issues, we changed to three-axis stability, but the problem now is that we can't stabilize it." Zhu Gong was very surprised. What is an expert? That's it. All of them will answer!
Both of these problems are fatal to photographic satellites.
As long as the output power of the solar panel is not enough, no matter how large the battery is, it will be in vain.
Bad photography and imaging are also a fatal problem. If a pure meteorological satellite is actually better, its spin stability can also be imaged through a multi-channel scanning radiometer, such as our early Fengyun-2, but if you use a slow-scan camera or other cameras, it will be troublesome.
"Mr. Gao, I'll say that it's not only the three-axis stable, but also the seemingly simple solar windsurfing control is a bit difficult. It's okay to spread both sides, just use parts such as springs to bounce it open, but there is one place that is, where the solar panels are connected to the satellite, which is difficult to deal with. Our satellites have working attitude requirements..."
When taking photos, there must be a specific posture. This photo attitude is the most preferred. It is impossible to adjust the satellite attitude for the direction of the solar panels, which is not worth the cost. The working fluid of the satellite's investment engine is very precious and is directly linked to the satellite's life.
The reason why satellites have a short lifespan is that they are designed as a return type, the medium and high-orbit satellites are mostly not broken in the sky. This thing is difficult to break. The main problems are two - either they are out of power or they are exhausted.
It is easy to understand that there is no electricity, and the meaning of no gas is to refer to the loss of working fluid of the adjusting engine. For example, the spacecraft that the Citiman, who was emitting helium before Gao Zhendong traveled through time, was worried about similar problems.
The satellite's attitude adjustment and orbital maintenance all depend on this thing. Once the working fluid is exhausted, the satellite will fall into a state where it cannot maintain its working posture and will slowly drop orbit, and then the ball will die.
The reason why all the aerospace powers later tried to find ways to build industrial fluid-free engines, even if the thrust is low and it seems unreliable, is what they want to do. The problem is here, and it has nothing to do with the general propaganda running outside the solar system. People can't live that long. The main reason is that this thing is very useful for the actual service life of spacecraft.
Therefore, saving working fluid is definitely the top priority.
"...In this way, the solar panels require the control of the direction. This brings a problem. The direction control depends on the motor, and the transmission device of our hand motor is a bit problematic. Three-axis stability itself is a system that takes up a large space and weight."
Unlike spin stability that can achieve the effect by relying on a simple rotary engine, three-axis stability requires a lot of equipment to be stable.
It seems that the solar panel control mechanism is very simple, but in fact, it is a big challenge in terms of already stretched capacity.
"Although solar panels are weightless in space, their mass is still there. If you want to rotate it, you must consider the issue of moment of inertia. In short, the transmission ratio of this transmission mechanism is that the larger the transmission ratio, the better, so that we can drive it with a miniature motor. However, the transmission ratio of the transmission mechanism in our hands is larger, and the head is not small, which is equivalent to the miniature of the motor being turned white, which is very troublesome."
He said, watching Gao Zhendong flip through the documents.
What does Mr. Gao mean? Haven't you been patient to listen?
Gao Zhendong took out a document from the drawer, carefully blocked the other parts, and then kept the remaining parameter table like a sunroof, and then put it on the table and pushed it to him: "Mr. Zhu, can you use the transmission for this parameter?"
This is why Gao Zhendong laughed at their erotic noses. As soon as they started the relevant research, they came to their door.
This method made it impossible for Mr. Zhu to pick up this material, but he didn't care about it. What was important was what was written on it.
He stretched his head over with difficulty, looked at the skylight on the table, his face becoming more and more surprised.
Although this thing is a little bigger, it is really okay for others.
"The load, transmission ratio, weight, layout method and structural form of this thing are simply born for us! It can even save an angle sensor directly! Although it is a little larger, it is already very good and very suitable. We can adjust the layout." With the parameters you can see in this sunroof, what other bicycles are needed? If there is any problem, we have not arranged it ourselves!
Moreover, the transmission ratio of this transmission is strictly corresponding, with super high accuracy and a large transmission ratio. Combined with the stepper motor control system, the rotation state of the output shaft can be calculated more accurately and directly.
Seeing this, he looked at Gao Zhendong with some confusion: "Mr. Gao, have you prepared for us long ago?" What does it mean to answer quickly? This is the quick answer, even all the answers are ready.
For a moment, Zhu Gong even doubted whether Gao Zhendong had sent someone to stare at them. Then he put this extremely unreliable idea behind his mind.
Gao Zhendong shook his head: "No, this was originally prepared for other projects, but I think you should be able to use it. This thing is still in the project establishment and development stage, but you are sure to catch up with your progress."
It was, but it wasn't true in this world line.
"That's great, then we're waiting for your good news! Thank you so much!" Zhu Gong was ready to go. Although the three-axis stability has not been resolved, at least solar panel control and even a considerable number of machinery that need to be driven in space can be said to have found the ultimate answer here. As for whether he could do this, he was not very worried. Judging from the past of Chief Executive Gao, his words are extremely credible.
"Then I will continue to talk about the three-axis stability, this is the case..."
Gao Zhendong knew that the three-axis stable spoke very long, so he simply interrupted him directly.
"Let's just talk about the details. Which part has a problem? I'll see if I can solve it. If I can't, there's no way."
I was stunned by Gao Zhendong's direct words. It was true that even though Chief Engineer Gao did not participate in any specific work related to satellites, he could just answer the details related to spin stability. He must have researched the stability system, at least he understood what he said, and wasted his time.
Tell me the problem directly, can I make a one-time deal? If I can’t, go find the next one immediately.
"Oh, OK."
Zhu Gong organized the language: "After we deny spin stability, we switched to using gravity gradient coarse stability plus three-axis precision stability, solar sensor plus gyroscope sensor to provide a stable reference method, and then discovered a new problem. The equipment and systems related to three-axis stability, such as gyroscope, flywheel stability, etc., have been added together, and their volume and weight seriously exceed the standard, especially the weight..."
Gravity gradient stability is actually a long pole extending back to the earth from the satellite, so that the earth's gravity will automatically pull the pole perpendicular to the surface of the earth, which will naturally stabilize the spacecraft. The accuracy is not high, but it is very easy to use as an auxiliary means. Anyway, there is no fuel. There are many spacecraft that stretch out a pole or long shelf that looks useless, but it is mainly for this.
For specific effects, see tying a magnet with a rope close to another magnet. The rope will be directly pulled directly to the magnet being approached by magnetic force.
"Well, this solution is indeed good. If the flywheel three-axis is stable, the weight and volume of the flywheel are relatively limited, and the rest is the gyroscope?" Gao Zhendong asked.
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"Yes, the flywheel is determined comprehensively based on the design conditions. In order to ensure the effect, we used 4, three directions, plus one oblique direction. This leaves little room for the gyroscope. The mechanical gyroscope with the accuracy is too large in size and component, and the problem now is that it cannot be installed at all..."
Before he could finish his words, he saw Gao Zhendong start to turn over the materials again with a look of surprise.
Is there any more?
Gao Zhendong did not open the skylight this time, and this thing was originally intended for them to use soon.
"This should be enough for you? This is a laser gyroscope that has been studied by the comrades from the original research institute. Look at it. You don't have to worry about this. This thing is almost just about acceptance, and you can even ask them for a few now." Gong Zhu looked at it, and Gao Zhendong laughed.
"Enough! Enough! Too enough! It's perfect replacement, light and small, and there is no wear problem of mechanical gyroscope! Mr. Gao, I'll go find them now!"
Zhu Gong even wanted to run to the original research institute. Compared with solar panel control, three-axis stability control is a problem they are more worried about. After all, solar panels are really difficult to control, so it is not a bad idea to install them at all.
Gao Zhendong held him down and said, "I've come here, but I still want to run away?"
"Don't worry, I'll give you two suggestions, you can consider it."
"You said, I remember."
Hey, Chief Engineer Gao has suggestions, so let the original research institute put it on first, and Mr. Zhu immediately sat back on the stool.
After all, the things there are ready-made, and Chief Executive Gao’s unknown suggestions may be even more important.
"I suggest you bring a device on it, a magnetometer."
"Magnet?"
"Yes, measure and review the strength of the Earth's magnetic field in space. These data can be used for spacecraft to determine its own position. Moreover, this thing is lightweight, does not consume much power, and does not require much temperature. Although the accuracy is low, it is very useful as an auxiliary position sensitive device. It is equivalent to this satellite, and it lays the foundation for the satellite behind it. Moreover, the magnetic field thing is very useful..."
(This chapter ends)