Chapter 1087 Titanium Alloy Hollow Fan Blade
Although the results are not given directly, as long as it is submitted to superiors for discussion, it basically means that the problem is not serious.
Especially when the technology itself has been proven on the ground and in the air.
The conversation among several people quickly turned to a more specific level.
After all, a satellite, especially a 100-kilogram-class small 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 tiny satellites will be launched with the probability of failure calculated before entering orbit, and then launched with redundancy.
But Chang Haonan and the others only tested four constellations this time, so they would definitely not be able to withstand any accidents.
Fortunately, Lin Senming and Zhang Weiyong are backgrounds in satellite design, so they have already considered all aspects in these aspects.
Guo Lin is also happy to reduce his presence.
Unless the question is related to one's own business, it is just a matter of silence.
Therefore, this 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!"
Guo Lin is considered a member of a brother unit after all, so Shen Junrong's attitude towards him is quite polite.
The three of them stopped at the same time and turned to look at the latter who was holding a briefcase and jacket in his hands.
Seeing them looking like they were facing a formidable enemy, Shen Junrong smiled and waved his hand, telling them to relax:
"Don't be nervous... we have just finished talking about the business, I just want to say... I want to ask a few more things that I am interested in.”
That’s what Guo Lin said, but Guo Lin couldn’t really take it as a chat:
“You said it”
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, the frequency domain and beam The pointing pressure is not big?”
“That’s right.”
Guo Lin nodded:
“For the sake of satellite size, we only have Two downlink channels and four uplink channels are set up, 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 Ocean-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 it took multiple cycles to transmit it, which affected the timeliness of the 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 Technology Commission, I had some contact with Advisor Chang. He is not the kind of person who only looks at what's in front of him..."
"From airships to airplanes to satellites, After putting so much effort into relay communication verification, the ultimate goal in the future is probably not to just serve a few spacecrafts or satellites, right?”
“When the number of users increases, won’t it be necessary? Solving the problems of frequency domain range and pointing flexibility? ”
It can only be said that people who have led large projects do have a different perspective.
The long-term goals planned by Chang Haonan can be seen through 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 diversification of use environments and the multiple classifications of remote sensing satellites themselves, it must be a quite complex network as Shen Junrong said. But Chang Haonan has never revealed how to achieve it technically.
However, after thinking for a while, Guo Lin on the side gave an answer:
“We did not apply for the commonly used but crowded L/S/C bands, but chose the Ka band, which is currently less used. , I have considered this, and the other thing is..."
At this point, he hesitated for a moment, seeming to decide 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. Related.”
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 range... all of which are suitable for use on satellites. .
It is logical for Guo Lin to make this speculation.
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.
When he held an industry meeting before, he overheard it from the leader of the Electronic Technology Group.
However, Shen Junrong did not delve deeper.
Although it is a national chess game, after all, we are not in the same system. It is impossible to tell you every detail just because there is a cooperative relationship.
Continuing to ask questions without taking it seriously will only lead to embarrassment for both parties.
Just in time, the four of them also walked to the door of the building.
He took advantage of the situation to say goodbye to the three of them, and once again asked to report the plan as soon as possible...
...
While comrades from several brother units were busy taking off because of his advance layout, Chang Haonan himself had also completed a series of preparatory work after the project was established.
Generally speaking, the development work does not officially begin until this stage.
However, the projects managed by Chang Haonan still conformed to his past habits -
In the pre-research stage, the tasks of each unit had been assigned, and even some key technologies had begun to be carried out. tackle key problems.
Therefore, less than a month after the AE1500/turbofan 20 project was established, Chang Haonan convened his two departments responsible for production and testing to conduct the first sample production workshop.
Of course, this does not refer to the complete machine sample.
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.
Actually, it can only be regarded as a prerequisite task for fan testing.
However, although it is a preliminary 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 curtain 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 blades, and enhancing the blade rigidity while also weakening the vibration intensity under high-speed rotation, thereby achieving better performance in the The design removes the boss in the middle of the blade body, which reduces the difficulty of manufacturing the outer contour of the blade..."
"..."
However, on both sides of him, there are more than a dozen other A technician looked embarrassed——
Compared with the fan designs they have been exposed to before, whether it is Turbofan 9, D436 or PS90A, the solution in front of them is hugely different.
The wide chord design really reduces the difficulty of manufacturing the outer contour.
However, the large backward curved and swept blade shape made of titanium alloy material itself means that the basic difficulty is extremely high.
Isn’t this nearly 40% internal hollowness a bit outrageous?
Due to the excessive void ratio and the fact that Chang Haonan did not radically adopt the blade pre-deformation design, a large number of triangular trusses were designed inside the fan blades to ensure strength.
It is even more of a nightmare during CNC machining...
After the introduction, Chang Haonan turned around and saw the embarrassed expressions of the comrades in front of him.
However, he showed a smile instead:
“Don’t grimace... I know that this blade is a form that you have never been exposed to before, and many brand-new ones will be used. Technology and concept...but I have basically planned the production route of the sample."
Hearing Chang Haonan say this, the atmosphere at the scene finally relaxed a little...
(End of this chapter)