Chapter 1016 SeA650 Engine, Final Assembly Completed!

After hearing this, Wu Wei's eyes revealed a clear confusion.

However, after today's round of ups and downs, his mentality has been tempered to be as solid as a rock.

Therefore, although he didn't understand it at all, he didn't show it, just waiting for Chang Haonan's further explanation.

After all, the latter had just mentioned that it would involve changes at the hardware level, so in the end it would have to be implemented by their fifty-fourth institute.

Sure enough, after a brief thought, Chang Haonan spoke again:

"In theory, as long as the mapping relationship between the superimposed waveform and the information can be established, the superimposed waveform can be directly demodulated without demodulating each user's information separately... Only one step of XOR operation is needed to eliminate the self-interference caused by the broadcast effect, and it will not add too much extra computing power and power consumption burden to the system."

"In addition, in this way, a typical single-hop two-way relay communication will only have two time slots in the middle, instead of three in the traditional transmission strategy, which is equivalent to increasing the theoretical throughput by about one-third..."

The jump in this deduction is indeed a bit large, which makes Wu Wei's eyes clearer.

Looking at the other party's appearance, Chang Haonan knew that he probably didn't explain the two paragraphs just now, so he had to return to car No. 1 and take out the notebook-

Just when waiting for the results of those rounds of experiments, he had already written down some ideas on it.

"Under the half-duplex condition, the system needs to perform two stages, uplink and downlink, to complete a two-way relay communication. In the uplink stage, node 1 and node 2 simultaneously send their own data frames S1 and S2 to node R. In the downlink stage, node R demodulates and maps the received superimposed electromagnetic wave signals to form a network coded data frame SR and broadcasts it to nodes 1 and 2."

Chang Haonan said as he found a page with relevant content in his notebook and handed it to Wu Wei:

"Because there is a mapping relationship between the superimposed waveform and the information, the node can restore another data frame by using the coded data frame SR and a data frame it originally has. At this time, the entire two-way communication process has been completed, and there is no need for a third time slot."

"Of course, the key point of this process is the specific plan for the relay node R to process the received superimposed electromagnetic wave signals. I haven't thought about how to design this point yet..."

Wu Wei listened to Chang Haonan's explanation while quickly scanning the contents of the notebook.

Although the illustrations were a bit abstract and the handwriting was rather flamboyant, he was not a beginner with zero basics, and there was a note next to him teaching on the spot, so he quickly understood the content above.

After that...

He couldn't help but read it again.

Although it didn't involve the means of engineering implementation, even from the perspective of ideas, it was enough to make people applaud.

It was a pity that the two of them were standing in a Gobi desert and there was no table to use.

So Wu Wei had to settle for the second best and slapped the hood next to him:

"Mr. Chang, isn't this just another implementation of network coding at the physical level?"

This summary is indeed insightful, and it can even be said to penetrate the essence through the phenomenon.

Even Chang Haonan couldn't help but look at it differently.

"From the principle level, it's really like this..."

He nodded:

"In my opinion, this technology should be called physical layer network coding technology..."

"..."

...

While Chang Haonan was busy developing a two-way communication relay system.

Another key project in the hands of the Aviation Power Group also achieved important interim results.

After about two years of research and development, the first prototype of the SeA650 in a complete technical state was finally assembled and rolled off the production line at the Snecma Group's factory in Villaroche.

In addition, a few days ago, Snecma's wholly-owned subsidiary, the Herrell-Dubois Group, had also produced two sets of engine nacelles for the first prototype according to the design provided by China.

This means that the power system of the entire Falcon Z project has officially entered the actual machine test phase.

Of course, since the entire SeA series of engines uses the M88-3 core engine, and the latter has previously been tested in China and France for a total of thousands of hours, the entire process will not be as long as a brand new engine.

If everything goes well, it will definitely catch up with the model's first flight at the beginning of next year.

There will definitely be risks when a new aircraft is equipped with a new engine.

Especially when both sides use a lot of new technologies.

However, thanks to the good aviation technology and excellent basic industrial level, Europeans do not have too much psychological burden for such things.

Besides, there are no other alternatives available on the market at this time.

Only the BR700 series jointly developed by Rolls-Royce and BMW is of the same level.

But Dassault Business Jets has never used Rolls-Royce products in the past, and the Falcon Z has integrated flight and thrust control. If the engine control system is to be replaced, a special version of the flight control must be modified.

In short, whether from the market or technical level, it is better to go directly with SeA650.

Anyway, judging from the situation of M88, there should not be any major flaws.

As the main designer of SeA650, Aerospace Power Group naturally sent a team to France to participate in the delivery ceremony under the leadership of Liu Yongquan.

When an important partner comes to visit like this, unless there are special needs such as confidentiality, the reception methods are the same whether at home or abroad.

First have a round of eating and drinking, and then introduce a history of the company's development (if the company history is too short, skip it, or change it to the boss's family history), then arrange a visit to different areas of the factory or R&D center according to the specifications, and finally have another round of eating and drinking .

The formal ceremony will not be held until the next day.

What Liu Yongquan and others faced was basically this set of procedures.

It must be said that as a veteran aviation company, Snecma’s final assembly factory is indeed worth a visit.

Although Huaxia has made rapid progress in recent years and has approached or even achieved international leading levels in many individual technologies, there is indeed still considerable progress in the overall organization and management of the factory, as well as basic skills such as mechanical processing and manufacturing. space.

Not to mention anything else, Liu Yongquan found many details worthy of learning from Liming Factory just as he walked through the workshop working environment and worker safety protection.

Of course, he came here to visit today, not to study.

Therefore, the group of people walked around and quickly arrived at the engine that would not be officially delivered until tomorrow, but had actually been tested on the bench for several rounds.

As a small engine with a medium bypass ratio, the SeA650 is not large.

Even because of the cancellation of the afterburner, it is shorter than the M88.

So if the thirty or so people wanted to watch, they would be divided into two levels: inner and outer.

But with Liu Yongquan's identity, of course he can have direct and close contact with him.

He leaned down slightly, put his head in front of the tail nozzle, and looked at the internal turbine structure.

It is not difficult to see from the light coming from behind that the turbine blades used in this prototype are still produced and exported by Liming Factory.

As for the turbine disk…

Although the view is blocked, the results are obvious.

Snecma has been trying to mass-produce SeA650 turbine parts at its parts manufacturing plant in Gennevilliers since March this year.

But Paris is a trial production workshop, which is considered a pilot environment, and there are still many differences from the actual factory.

In the end, it took more than two months and still no complete batch of qualified products was produced.

With no choice but to place a new order with China before final assembly, it was used for the production of a total of four prototypes.

Although to this day, Snecma has still not publicly admitted that it will use parts provided by Liming Factory in mass production products.

But everyone already understood it tacitly——

The yield rate produced in two months is 0, which shows that there is a big problem in the process technology and even the process route, which cannot be solved by simply adjusting parameters.

Whether it is a complete upgrade of an existing process or the development of a new process from scratch, the cycle is basically calculated in years.

Your Falcon Z will make its first flight early next year as planned, and the product will be delivered the year after next at the latest.

How can I have so much time for you to slowly research new techniques?

We can only use imported parts to top it off first, and then make long-term plans in the future.

Just like when China introduced the Arriel 1C engine from France.

It's just that now the offense and defense have changed.

But then again.

In this way, the next move is almost obvious.

As an important partner, Aerospace Power Group cannot wait for Snecma to complete technical research before kicking itself out of the supplier list.

Therefore, you must sign a minimum supply quantity and minimum delivery time guarantee contract.

That is to say, no matter whether Snecma solves the process problem or not, it needs to order no less than a certain number of products every year for at least x years.

Or simply, within the entire life cycle of the entire series of engines, no less than xx% of turbine parts must be supplied by China.

In fact, Liu Yongquan led the team on this trip. In addition to participating in the delivery ceremony, another important task was to communicate with Snecma and reach such an agreement.