Chapter 1087 Titanium Alloy Hollow Fan Blades

Although the results were not given directly, as long as it was handed over to superiors for discussion, it basically meant that the problem was not serious.

Especially if the technology itself has been proven on the ground and in the air.

The subsequent conversation among several people quickly turned to a more specific level.

After all, a satellite, especially a small 100-kilogram satellite with limited frequency band resources and energy supply levels, has many issues that need to be considered in addition to the core functional modules.

For example, cross-layer adaptive transmission, Doppler change rate estimation algorithm, Ka-band satellite channel model, and tilt estimation algorithm, etc.

Not to mention at the beginning of the 21st century, even in another twenty years, a large number of microsatellites will be launched with a probability of failure calculated before entering orbit, and then launched with redundancy.

But Chang Haonan and his team only tested four constellations this time, so they would definitely not be able to withstand any accidents.

Fortunately, Lin Senming and Zhang Weiyong were originally from satellite design backgrounds, so they had already considered everything in these aspects.

And Guo Lin was happy to reduce his presence.

Unless the question is related to one's own business, it is just a matter of silence.

Therefore, the meeting came to an end very quickly.

However, just after leaving Luan Wenjie's office, he was stopped by Shen Junrong who followed him out of the office.

"Comrade Guo Lin, please wait a moment!"

After all, Guo Lin is considered a member of his brother's unit, so Shen Junrong's attitude towards him is relatively polite.

The three of them stopped at the same time and turned to look at the latter who was holding a briefcase and coat in his hands.

Seeing them looking like they were facing a formidable enemy, Shen Junrong smiled and waved his hand, signaling them to relax:

"Don't be nervous... We've just finished talking about the business. I just want to ask a few more things that I'm personally interested in."

That’s what he said, but Guo Lin couldn’t really take it as a casual chat:

"You said."

As an expert in the field of aerospace measurement and control, Shen Junrong is naturally most interested in his old profession:

"I remember you just said that because this constellation only corresponds to individual spacecraft and ground terminals, there is not much pressure on the frequency domain and beam pointing?"

"That's right."

Guo Lin nodded:

"Due to satellite size considerations, we only set up two downlink channels and four uplink channels on each satellite, but combined with the new attitude determination algorithm, it is expected that the communication needs of this test can still be achieved."

In fact, Guo Lin did not tell Chang Haonan's entire plan.

This four-star constellation is expected to operate effectively for more than a year.

After completing the relay communication mission for Shenzhou 5, it will return to the original design purpose.

That is to provide a wider image return window for the Haiyang-1 satellite——

Or only serve individual objects.

It is expected that the time for data transmission can be increased to 6-8 hours per day.

Of course, because the communication rate of Ocean One itself is very slow, it is impossible to reach the theoretical performance upper limit of the relay constellation.

But it is enough to avoid the situation at the beginning of the year where a lot of useful information was captured but required multiple cycles to be transmitted, which affected the timeliness of reconnaissance information.

However, this answer obviously did not solve Shen Junrong's doubts:

He motioned for several people to move forward together and continued:

"When I was at the Science and Industry Committee, I had some contact with Advisor Chang. He doesn't seem like the kind of person who only looks at what's in front of him..."

"You have put so much effort into verifying relay communications from airships to airplanes to satellites. So the ultimate goal in the future is probably not to just serve a few individual spacecraft or satellites, right?"

“Then when the number of users increases, won’t we have to solve the problems of frequency domain range and pointing flexibility?”

I can only say that people who have led large projects do have a different perspective.

Chang Haonan's long-term goals can be seen at a glance.

In fact, the other three people didn't know about this issue either.

Zhang Weiyong knew that Chang Haonan's original purpose of planning the relay communication constellation was to form a global space-based remote sensing system with a revisit cycle of days or sub-days at the lowest possible cost.

And it takes into account multiple levels of tactics and strategy, military and civilian use.

Considering the diversity of usage environments and the multiple classifications of remote sensing satellites themselves, as Shen Junrong said, it must be a quite complex network.

But Chang Haonan has never revealed how to achieve it technically.

However, Guo Lin on the side gave an answer after pondering for a while:

"We did not apply for the commonly used but crowded L/S/C bands, but chose the Ka band, which is currently relatively sparsely used. We have considered this aspect, and the other thing is..."

At this point, he hesitated for a moment, as if deciding whether he should continue.

But finally he continued:

"Although Mr. Chang didn't mention it explicitly, I personally guess... it may also be related to the new wide-bandwidth angle phased array technology we are currently testing."

Ground testing of the optically controlled phased array radar has been carried out for almost two years. It has many advantages, such as light weight, low heat generation, high beam pointing accuracy, and wide frequency domain... all of which are suitable for use on satellites. .

It is logical for Guo Lin to make this conjecture.

When Shen Junrong heard the description of "new phased array technology", he knew that the other party should be referring to the optically controlled phased array.

He had heard this from the leader of the China Electronics Technology Group when he was holding an industry meeting.

However, Shen Junrong did not delve further.

Although the whole country is a chessboard, everyone is not a system after all. It is impossible for you to reveal all the details just because of the cooperative relationship.

Continuing to ask without any care will only lead to embarrassment on both sides.

Coincidentally, the four people also walked to the door of the building.

He took the opportunity to say goodbye to the three people and asked them again to report the plan as soon as possible...

...

While the comrades of several brother units were busy because of his early layout, Chang Haonan himself had completed a series of preparatory work after the project was established.

Generally speaking, the research and development work is officially started at this stage.

But the project managed by Chang Haonan still conforms to his past habits-

In the pre-research stage, the tasks of each unit have been assigned, and even some key technologies have been tackled.

Therefore, less than a month after the AE1500/WS-20 project was established, Chang Haonan convened the two departments responsible for production and testing to hold the first sample production seminar.

Of course, it does not refer to the whole machine sample.

It is not even a component-level sample.

Even if there is a system cheat, it is still too outrageous to come up with complete design parameters in one month.

In fact, it can only be regarded as a pre-task for fan testing.

However, although it is a pre-task.

But the difficulty is not low at all...

In the conference room, Chang Haonan was sitting at the head of the conference table, looking sideways at the blade design displayed on the screen behind him.

"In the design, we tried to increase the relative chord width by more than 40%, greatly improving the aerodynamic efficiency of the fan blade, and enhancing the rigidity of the blade while weakening the vibration intensity under high-speed rotation. In this way, the boss in the middle of the blade body was removed in the design, reducing the difficulty of manufacturing the outer contour of the blade..."

"..."

However, on both sides of him, more than a dozen other technicians looked embarrassed--

Compared with the fan designs they had previously come into contact with, whether it was WS-9, D436 or PS90A, the scheme in front of them was very different.

The wide chord design did reduce the difficulty of manufacturing the outer contour.

But the use of titanium alloy to make a large backward-bent and swept blade means that the basic difficulty is extremely high.

And the nearly 40% internal hollowness is a bit too outrageous, isn’t it?

Due to the excessive void ratio, and Chang Haonan did not adopt the radical blade pre-deformation design, a large number of triangular trusses were designed inside the fan blade to ensure strength.

It is even more of a nightmare in the CNC processing process...

After the introduction, Chang Haonan turned around and saw the embarrassed expressions of the comrades in front of him.

However, he smiled instead:

"Don't be so bitter... I know this blade is a form that you have never touched before, and it will use many new technologies and concepts... But I have basically planned the production route of the sample."

Hearing Chang Haonan say this, the atmosphere on the scene finally relaxed a little...