Chapter 1122: We Can’t Expand Nuclear Power, but We Can Expand Nuclear Power

Time soon came to the end of 2003.

The tracking filtering technology mentioned by Chang Haonan before has begun to take shape.

Of course, it is purely a dream to come up with a hardware prototype in just one week.

Even if you hit the screwdriver with sparks, it's too late.

Therefore, what he actually produced was actually a program that simulated the filtering function.

It cannot play a practical role.

But the principle of argument is enough.

At the second seminar of the project team, Chang Haonan retrieved a data curve from the computer on the spot and input it into the program as an analog signal source.

"Is this the test data of the fan blade from a few days ago?"

Qu Liangsheng sat next to Chang Haonan, leaned over and looked at the first vibration amplitude curve, and asked curiously.

"That's right."

The latter did not move his eyes away from the screen. He quickly entered the parameters and replied:

"The dynamic balance of the blades is better than I expected, but some parameters of the truss-type sandwich structure need to be further optimized to achieve a cyclic fatigue life of more than 10^9 cycles..."

These parameters are all content that needs to be publicly publicized after future commercialization, so Chang Haonan doesn't mind revealing them in advance.

What's more, the other party is one of our own.

"A billion times?"

Qu Liangsheng specializes in ground and offshore equipment, so there is little need to consider the weight of the equipment.

But even so, this cycle fatigue life really made him feel exaggerated.

"There is no way...the crack growth life of titanium alloys is too short and there is almost no fault tolerance, so we can only raise the standards."

Chang Haonan hit the Enter key, then breathed a long sigh of relief, leaned back in his chair and waited for the calculation process to end:

"Of course, on the other hand, the maximum operating temperature of the fan blades will not exceed 400°C, and the rotational speed is only four digits. The conditions are still relatively mild...The main difficulty lies in the balance between static strength and high cycle fatigue performance."

Seeing that the work at hand was over, Qu Liangsheng suddenly changed the topic:

"Speaking of which, I analyzed the imbalance compensation technology that you mentioned last week, Academician Chang, after I went back..."

He took out a notebook from his pocket and opened it.

A simple geometric model is drawn on it.

"Of course, the electromagnetic bearing-flexible rotor combination is still too far away from being implemented, so I wanted to use it in the improvement of existing products, including the next generation, so I prioritized the research on the contact bearing-rigid rotor combination, and then through the A balance block is installed on the rotor for balancing..."

"The balance of a rigid rotor requires two correction planes, which is equivalent to four balance weight angles that need to be adjusted. The monotonic relationship between the optimization objective function and these four angles is very unclear, so it can only be converted into four one-dimensional Variable loop optimization problem."

"Assuming that the rotor correction surface and the measurement surface are the same and both are on the rotor end surface, the centrifugal force generated by the unbalanced mass of the rotor is mu, the maximum centrifugal force generated by the two balance head correction mass blocks is m, and the coordinate system and the rotor rotate synchronously, then... …”

"..."

At first, several graduate students nearby took the initiative to come over, wanting to hear what the two big guys were discussing.

But soon someone sat back down again...

In fact, if the entire question was turned into a detailed paper, many people might be able to understand it.

However, the discussion between Qu Liangsheng and Chang Haonan was too jumpy and it was really difficult to follow the train of thought.

It wasn't until about fifteen minutes later, when the simulated filtering results came out on the screen, that the former explained the entire derivation process.

Of the dozen or so people who had gathered around just now, only three were still behind Qu Liangsheng.

Judging from their intelligent eyes, I'm afraid they didn't really understand.

Just wanted to see what happens next...

While the old academician was drinking water after finishing his lecture, Chang Haonan reviewed the other party's derivation process again.

I found that it is generally a coordinate rotation method.

It can ensure that the stable point of the objective function is searched, and it must be the global optimal solution to the optimization problem.

Then the purpose of the other party coming to find you is already obvious...

Therefore, Chang Haonan took the initiative to ask without the need for Qu Liangsheng to speak again:

"I think... Academician Qu should have already tested this algorithm?"

Qu Liangsheng, who had just put down the water glass, visibly hesitated, then nodded:

"Yeah, but it's just like yours, it's just a simulation test."

He pointed at the computer screen in front of Chang Haonan——

The results after filtering are shown above.

Even if there is no detailed analysis, it can be seen that the noise signal other than the vibration component of the same frequency as the rotation speed is much weaker than before processing.

At least it won't dominate the show.

And this result was already expected by Chang Haonan.

Therefore, he didn't even bother to look, but continued to discuss the issue at hand with Qu Liangsheng:

"I think the test results should be very good. Except for a few tentative steps, every other operation will reduce the amount of vibration, and the system vibration will not change suddenly. It just takes a long time and cannot adapt to the need for rapid balance. , right?”

Hearing this, several graduate students who had worked with Academician Qu in the past two days couldn't help but stop recording or communicating, and all looked in the direction of Chang Haonan.

Obviously, the latter guess is not wrong.

Even Qu Liangsheng didn't expect Chang Haonan to predict the result so accurately.

After opening his mouth several times, he asked with a little regret:

"So Academician Chang, you also think that this technology cannot be used on rigid combinations?"

Although the calculation model of the contact bearing-rigid rotor is simple, the adjustment range of the two degrees of freedom only through the slider is limited. Compared with the various control methods of the electromagnetic bearing, the potential is indeed not very good.

"Um……"

Chang Haonan looked at the notebook in front of him, organized his language a little, and then borrowed a pen from a graduate student next to him:

"Not entirely. Of course, the adjustment range and effect are definitely not as good as electromagnetic bearings..."

"If we use the influence coefficient method instead, we can identify the initial information of the balance head by rotating the balance head twice, and then directly solve the algebraic equations to determine the rotation angle of the balance mass, thereby quickly finding the optimal balance point... …The specific strategy is probably…”

Chang Haonan quickly listed a matrix calculation formula on the paper.

"As long as the first round of balancing can be achieved, the parameter values ​​can be saved, and then the remaining vibration amplitude after balance can be measured again, and the subsequent recursive process can be entered..."

"..."

Facing Qu Liangsheng, Chang Haonan did not need to explain the entire process like he was in class.

As long as you explain a few key points, the other party will understand.

As for more specific engineering practice, it definitely requires joint research by both parties based on the actual situation.

So it didn't take long for him to put down his pen again:

"Of course, this balancing strategy may cause a sudden increase in the unbalance amount when identifying the initial information of the balancing head. It can only be used for rotors with a small balance correction amount. Specifically for centrifuges, the separation factor of a single separation stage cannot be too large... …”

The graduate student next to him had quick eyes and quick hands, and he put the pen back at the speed of light.

It’s not that he is stingy, in fact, in the past week, he has been prostituted by others for almost a box of ballpoint pens...

Fortunately, Qu Liangsheng and Chang Haonan were paying attention and did not notice this small movement.

"It's enough... not too big but enough."

The former brought the notebook to his eyes and read it carefully again:

"Although it is not weapons-grade, it can just solve the most urgent needs of the nuclear power industry..."

In 2003, although China already had nuclear power technology and industry, they were not very developed.

There are only three nuclear power plants in operation, Qinshan, Daya Bay, and Ling'ao, which together account for 2% of the country's power generation.

Among them, only Qinshan's reactor was independently designed and built.

But according to the plan, nuclear power plants will build reactors very quickly in the next few years.

For example, Tianwan Nuclear Power Plant is already building its first two VVER units.

This places higher demands on the supply quantity and quality of nuclear fuel.

Qu Liangsheng closed his notebook and looked at Chang Haonan solemnly:

"Academician Chang, I wonder if you are willing to go to Jincheng to make a name for yourself?"