Chinese entertainment for engineering students

"So, the core reason is that the sensor is overweight?" Wang Xu took a bite of the duck and watched Wang Fei pour wine for the guests. Wang Fei didn't go out today, but came to accompany him, which made him very happy. He was depressed because no one answered. My mood became much more relaxed.

"It's just one aspect, but it's really the most important thing. The core of the quadcopter flight control is the gyroscope, which is similar to the inertial guidance part in the missile, and the space you leave for this part in the drawing is simply not enough to install this thing.

In addition, you have particularly high requirements for balance and are required to be able to hover stably in level 7 winds. This requirement requires at least a three-dimensional level to monitor the attitude of the aircraft at any time so that it can be adjusted at any time.

If other smoothness is needed, all four corners should be needed to balance the jitter and deflection caused by the rigidity of the body itself.

Similarly, you also require at least two 50 Ah lithium-ion batteries to be hot-swappable without shutdown, and you must also leave enough space.

We roughly calculated that the overall weight is about 2 kilograms. According to your parameter design, it is more than 30% overweight. This kind of overweight cannot be solved by ordinary methods.

I took a wild guess and guessed that your initial idea was to use Mems micro electromechanical sensors.

But we basically can’t buy that thing unless we use special channels. For a private project to make a movie, it’s not very worthwhile, and we don’t have that option. "The speaker is in his thirties, quite handsome, wearing a pair of gold-rimmed glasses, and looks a bit like a young student.

His name is Zhang He, a professor at the Imperial Aviation College. He studied for a doctorate in Chou State. He later worked at Boeing for two years and was one of the special hires invited back by the Imperial Aviation College.

In recent years, the colleges on College Road have begun to recruit overseas talents back to China in a planned way. Although they cannot provide any particularly good treatment, the professional titles are basically given at once.

Although this man looks gentle and elegant, he is very quick-witted when speaking and working. He has a slight accent from the three eastern provinces, but Wang Xu can't tell where he comes from.

"No wonder, as long as there is a reason, I thought you looked down on such a small project."

"How could that be possible? Who doesn't know that your Dongsi Wang Er project is a fat one? If you weren't really unsure, how could you refuse to accept it?" Zhang He happily raised his glass and touched it with Wang Xu.

Wang Xu and Zhang He have known each other for a long time. They met at last year's College Student Science and Technology Festival. He led the Royal Aircraft Academy's electric aircraft endurance contest, which involved specifying an AA battery and a small motor to see who could fly the farthest. That game.

In this event, Imperial Aviation Academy won the championship, but only by a narrow margin of more than ten meters.

But on the rubber band flight, I was inferior to Northwest Airlines. I obviously took longer to prepare than others, but I still lost in the end. I felt quite embarrassed.

However, I got to know Wang Xu and left each other's contact information. Wang Xu always attached great importance to various young scientists and engineers and paid great attention to collecting their information.

This time it was used. The mission of the quadcopter was announced. Many people came to ask, but in the end no one took it. This made Wang Xu very confused. After seeing Zhang He also wrote to inquire, he invited him to come to Shuimu for dinner. , by the way, ask about the situation.

"Then let's study the chip. I'll find someone to do it here. It's not a big problem. This thing is similar to the IC circuit manufacturing method, so it should be possible."

"Can you make this thing?" Zhang He was obviously shocked. This thing is truly sophisticated. It was not until five years later that the first Mems sensor was developed by the Institute of Microelectronics of the Chinese Academy of Sciences.

It was not until the 21st century that this thing was mass-produced in China. Large-scale mass production and the price were reduced to cabbage, and it was ten years later.

This kind of chip will be found on any smartphone in the future. The compass, shake, jitter, and posture are all information provided by this microelectronic mechanical chip.

Therefore, Wang Xu never thought about such a trivial thing. He always felt that what China could produce was not high-tech, and his eyes were always focused on those things that China was still stuck on.

As everyone knows, in this era, this thing is really unavailable. Why? Everyone who understands understands (you are not allowed to write).

This is why Zhang He was shocked after Wang Xu lightly said to do it.

During the later war between Russia and Ukraine, this was actually what Russia was most afraid of cutting off its supply of. For this reason, it sometimes had to buy Chinese products and disassemble them for parts.

As for the cruise missile, in addition to Beidou navigation, the inertial navigation part is realized by such a small chip.

Later generations would strike accurately at every turn, which felt very worthless.

You must know that during the 1991 Gulf War, the precise strikes of Tomahawk missiles completely shocked the entire Chinese military community, and many seminars were held.

Later, China made all kinds of dumplings, all kinds of high-end, but now, hehe, (not allowed to write)

This incident only became well-known to the public after the Internet era, especially after the Yugoslav Embassy incident. It was mentioned repeatedly in various memoirs and gradually emerged from the circle.

Wang Xu knew it, but there was really nothing he could do. Without this incident, other incidents would have happened.

The Ugly Kingdom has been left alone to seek defeat. They no longer need China to watch over the red monster for them. (I won’t let you write this because it’s diplomatically sensitive.)

The Chinese military fans are the saddest at the moment. All the magazines introduce foreign weapons, including the army, navy and air force, without exception.

This situation will continue until the second decade of the 21st century. Only after China's various new equipment is unveiled one by one will military fans have a good meal.

"There should be no problem." Wang Xu thought about it carefully, and actually looked for it in the technical list of the camera he just bought. Well, sure enough, it is there. This thing is a necessity for all equipment that requires attitude detection.

Mems can be made into micron-level or even sub-micron-level sizes in the future, but that requires higher chips to be made.

The principle of this thing remains unchanged. Being so small is mainly to serve the combination of mechanical structures. A single sensor, or a combination of several sensors, does not require such high process specifications. China's existing chip manufacturing process is completely can be satisfied.

However, with the research on various chips for supercomputing projects, China's lithography machines have also successfully made breakthroughs. This has temporarily solved the bottleneck problem. Canon, in its small days, has relented and provided China with lithography machines and related equipment. .

China's latest chip factory has begun construction in Shanghai, and I don't know how they are doing. Chip factories are really not something that can be run with just the equipment. Both R\u0026D and operation are indispensable.

In the past life, China established several wafer fabs in the 1990s, but they all ended dismally. The reasons were a lack of talent, a lack of management capabilities, and even a lack of respect for chips.

It can be said that those Chinese people from the Ugly Country and the Bayan people really brought a lot of technology and management experience. Later, China was able to successfully break through in this field, and overseas talents really contributed.

Wang Xu is not worried about production problems. After all, the quantity he wants is not large. As for mass production, there will still be capable Chinese entrepreneurs who will come forward. Not all Chinese people build houses.

Therefore, Wang Xu nodded with certainty. This thing has so many uses that Wang Xu can't even count them. For example, another common application is inkjet printers. EPSON uses this kind of piezoelectric micromachines. High-precision inkjet printing.

"That would be great. If this part can be solved, the only thing left is remote control and image transmission.

Your requirements require the ability to transmit images in real time and install the equipment in such a small space. I have never heard of anyone who can do that.

As for the three-kilometer remote control distance, it also faces size and weight problems, and the current remote control module cannot be installed. "

"Ah, that's right." Wang Xu scratched his head, and the sequelae of time travel appeared again. This kind of bad technology in later generations is almost impossible to accomplish in this era.

Remote control in this era mainly used analog signals. You can tell by looking at the weight of mobile phones today. As for image transmission, it needs to be broadcast through television using PAL or NTSC standards.

The average person doesn't even think about digital video being distributed via digital wireless links.

On the contrary, Chou State used C3I bus technology in the command system, which is a digital transmission method. It sounds like a god-like technology to China. But that thing uses microwave communication, and the loan is only 1M. Transmitting a video will take up all the bandwidth.

"Okay, let's separate this thing first, and remove the requirement to upload the image back first.

As for the remote control, we should do it separately. I really don’t know if it’s possible. "Wang Xu is really a little weak this time.

Later generations of DJI can be ranked first in the world, and its unique Light bridge connection technology can be said to account for a big reason. This technology allows DJI drones to transmit 720P high-definition images within a range of three kilometers.

This indicator alone lags behind a large number of small brands that use WIFI and Bluetooth technology.

But this technology is unique to DJI and is kept secret. No one really knows how they achieve it.

Well, okay, even if it wasn't kept secret, Wang Xu probably wouldn't know about it, and no one, no matter how engineering-majored, would be interested in pondering this.

Of course Wang Xu can come up with WiFi, Bluetooth, and even star flash. These technologies are all included in the cameras he buys. But even Star Flash only supports high-speed connections of about one kilometer. Of course, Star Flash’s connection speed and multi-device capabilities cannot be matched by Light bridge.

In this regard, Wang Xu really has no choice. Maybe he can slowly save money and buy DJI's technology, but it's hard to catch up with the technology from far away. Huawei is still tinkering with program-controlled switches.

However, you can go back and ask Director Jiang, maybe he can find someone. What should I do if I can't do it myself? Yao Ren, as a direct descendant of Shuimu, he naturally knows how to make full use of his own resources.

A full version of DJI is definitely not possible now, but it may not be impossible to make a castrated version. If color video is not possible, then it may not be impossible to transmit TV signals.

The remote control capability requires a very small bandwidth, and using analog signals is also a method. Digital is not available now, so analog is the main solution.

The key is to be able to let him fly. This thing is actually not that helpful to Wang Xu's movie. After all, this movie does not have many large-area panoramic shots.

After all, it is just a small gift from Wang Xu to the above. We can't handle the big one, but we can't handle the small one.

"Are there any other problems?"

"The rest is the flight control. You need to provide the motor. The motor performance you indicated cannot be achieved by ordinary domestic products." Zhang He seemed to feel that the project must be his, and began to bargain.

"You still have to compete. I can't blatantly violate the rules." Wang Xu reminded him.

"Of course, you revealed the news to me in advance. If you want to go through the back door, I won't have the nerve." Zhang He didn't care. His face was very red. It was because of the drink. I didn't expect this gentle man to still show up. Really drinkable.

What Wang Xu didn't know was that Zhang He was also stunned in his heart. Why didn't Wang Xu change at all when he drank wine? He was almost there. Wang Xu on the opposite side spoke clearly and adjusted clearly, as if he hadn't drank.

"Okay, as long as you know it, your strength should be no problem. I remember that your computer department is also very strong. If you get this project, you will be equipped with a brand new workstation, which is much easier to use than ordinary PCs." Wang Xuchi They eat food and drink, and interact with Wang Fei from time to time, picking up dishes from each other.

"Yes, yes, thank you very much, brother. Our department has purchased two sets of Tongfang workstations. Three-dimensional simulation is very easy to use. We have a group that is working on a simulated flight platform. They use the equipment you made. The basics are Open source products are also made by you, you are really awesome. Hiccup."

Zhang He's compliment was very genuine, with a hint of the heroic spirit of a Northeastern man, but a sudden hiccup made him feel timid.

Wang Fei obviously also noticed the embarrassment of Zhang He who was covering his mouth and burping. He was drinking with Wang Xu and being made like this by Wang Xu without knowing it. It was so normal. Wang Fei didn't know how many times she had seen it, but she still found it very interesting. .

Wang Fei could hardly understand what they talked about today, but she still stayed with Wang Xu quietly. Wang Xu was good at this. Unless Wang Fei felt annoyed and she didn't want to come, she would never do it because of Wang If she didn't understand, she would isolate Wang Fei from her own world.

To be honest, there are not many people in China who can understand all the things Wang Xu does. Wang Xu will not cause trouble for himself. He insists that his own woman can talk to him about these things.

That's hypocritical. Although Wang Xu doesn't have much experience in love, he's not a noob either. Bringing his woman into his life and letting each other's lives blend together is the long-term way for a couple.

Giving women a sense of participation is a very important thing in itself. If it happens too often, Wang Fei will not be able to be a stick. It is actually quite boring just not understanding.

Therefore, most women will not interfere endlessly in your daily life, but if you don't let her and she doesn't want to, it's two different things.

——

(See you tomorrow)