Chapter 33: This result cannot be made public! (2 in 1) (page 12)
However, the surprise in Fang Zhen's eyes only lasted for a moment.
"Junior brother, if you want to redesign the wing, it will definitely affect the whole body. The overall structural characteristics of the aircraft will be changed, and it may also involve a higher level of materials and manufacturing technology, both in terms of cost and capability... …”
Fang Zhen's concerns are actually justified.
Because products don’t grow on their own off the shelf.
No matter how miraculous abilities Chang Haonan shows, things in the engineering field must eventually be implemented into production and manufacturing.
But this field cannot be promoted by the flash of inspiration of one or two geniuses.
Even if the raw materials, machinery and equipment, and a full set of technical documents are prepared for you, just cultivating workers who can adapt to new equipment and new technologies will not be achieved overnight.
The wing design scheme in their hands has basically reached the current upper limit in this regard.
But this time, before Han Feng could explain, Du Yishan spoke first.
"I think according to the calculations written by Xiao Chang, we should consider using active suppression methods without modifying the wing design?"
Although he has long passed the golden age of doing research, Du Yishan is experienced and well-informed after all, so he can see far more from those ten pieces of draft paper than two PhDs.
"Yes, Teacher Du is right." Chang Haonan nodded and continued:
"We can use model predictive control (MPC) theory to handle the constrained control system through rolling optimization and feedback correction to achieve active suppression of chatter."
"So you need to consider the influence of the flaperons and do aerodynamic servo elastic modeling?" Yao Mengna's eyes lit up.
She was just thinking about why Chang Haonan did this.
I originally thought it was just the other party's obsessive-compulsive disorder, but I didn't expect that there was a greater purpose behind it.
Thinking of this, Yao Mengna sighed softly in her heart.
At the beginning, she still felt a little unwilling to admit defeat towards Chang Haonan.
But now...
Recognize the reality.
Chang Haonan nodded: "Of course, but this time there is no need to re-simulate. Just apply an MPC control signal to the wingtip acceleration curve just calculated. I have already written the specific control rate into the program before."
He had already said this. How could the two doctors not understand? Fang Zhen quickly came back to the computer and started processing the data.
The next ten minutes felt like ten hours.
"After applying MPC control to the wing, the flutter critical speed increased to...175m/s."
There was some trembling in Fang Zhen's voice.
"That's no problem. 175m/s is equivalent to 630km/h. The safety margin is almost a quarter."
Chang Haonan's mentality was very stable at this time: "So our passenger aircraft can definitely use this new wing design!"
However, this time it was Yao Mengna who was worried.
After hesitating for a few seconds, she spoke in a voice that only four people could hear:
"But teacher, Junior Brother Chang, this is a brand-new engineering model after all. Professor Huo Jint is a foreign expert hired with a lot of money by the Haojing 603 Institute. The results are so different at once. Do you think they can really dare to use it?" What?"
Oddly enough, Yao Mengna was usually fearless when doing scientific research, but this time she was a little worried for the first time.
"foreign expert?"
At this time Du Yishan also recovered from the initial excitement:
"Huh, what's wrong with the foreign expert? Does what he says from the British have to be right?"
As he spoke, he stretched out two fingers and knocked on the table next to him: "Since the 603 Institute has handed over this project to us, it means that they at least have this idea and the courage."
"Then our topic is basically...completed?"
Fang Zhen next to him couldn't even believe what happened.
You know, just one day ago, he and Yao Mengna were still struggling with the idea of nonlinear simulation.
One day later, this problem was easily solved by a new undergraduate student who joined the research team.
By the way, the problem of the wing flutter critical speed being too low was also solved.
"The completion of the project must be done slowly. At least the completion report needs to be polished."
Du Yishan looked at the piece of paper in front of Fang Zhen with the calculation results written on it and said:
"I will personally go to Haojing tomorrow to explain the situation clearly to Comrade Zhou Yonghang and Comrade Yi Yuanhe. This is not just a problem of an air wing, nor is it just a passenger aircraft project."
Zhou Yonghang is now the director of Haojing Institute 603, and Yi Yuanhe is the chief engineer. They must sign and agree to replace the wings and conduct a flutter test again, a risky test subject.
Chang Haonan next to him remained silent, but he was already overjoyed in his heart.
As an academician, Du Yishan no longer holds front-line positions, but his influence is still there after all.
If he comes forward, there is a high probability that the 603 Institute will choose to believe this result and conduct a series of subsequent flight tests.
Once the test shows that there is no problem with this method, Chang Haonan, its creator, will definitely be noticed and can at least participate in the MA-60 follow-up project.
Compared with his initial plan to start with Professor Liu Hongbo and then gradually get involved with the Xinzhou 60 project, the progress has been made many times faster.
"It's just Xiao Chang." Du Yishan pulled a chair and sat next to Chang Haonan: "Your model involves our specific model design, and it has a wide range of applications. It will play a role in the entire aircraft design, especially in the field of passenger aircraft design. It has a huge effect, so... I’m afraid it won’t be suitable for public release in a short period of time.”
Chang Haonan was stunned.
"what do you mean……"
Obviously, since Du Yishan just expressed his intention to go to Haojing in person, he must not be prepared to hold on to this result.
So the only possibility is...
"Let the 603 Institute conduct verification first. If it can be determined to be feasible, it will become the internal design material of our national aviation system."
Du Yishan took off his glasses, wiped them with his clothes and put them back on:
"Only this kind of internal material can be seen by very few people."
"It's okay, Mr. Du." Chang Haonan smiled and replied in a nonchalant tone: "I have told you before that I think the value of our China Airlines people is not reflected through papers."
How could he be satisfied with gaining a little fame in the academic circle after reviving his life with the system?
The top priority is to find ways to gain access to higher-end projects as soon as possible, obtain more resources, and help China's aviation industry, and even the entire industry, develop on the fast track.
For him, the paper is just a means, not an end!
The previous improved design of the J-7 was said to be a second-and-a-half-generation improved model, and it was just a course design assignment, so it was necessary to use the influence of the journal to let others see it.
