I personally created the dragon chant of the great nation

"But, since the senior sister has said so. "

That means it's a test for you. "

"I can't excuse myself, do I? "

"So I can only ask you a few questions, Comrade Chen Qingxuan. "

Li Xiaoran said, so he casually found a few questions in the book and asked.

Actually, he couldn't understand it either.

But luckily, there is the right answer in the book.

"Due to the vibration at the bottom of the engine, it will cause alternating stress reaction, resulting in material fatigue failure, in order to avoid the occurrence of mechanical resonance accidents, after vibration analysis and dynamic load calculation, vibration isolation materials such as spring rubber are usually installed. "

"According to the principle of the Great Lambert, the inertial force and the moment of inertia are included in the energy balance equation, and the force or moment that needs to be applied to the prime mover structure in order to balance the static load and the dynamic load, as well as the reaction force, is calculated, that is, the dynamic static analysis. "

"The balancing of the rotor is specified in Kyoto, and as long as the remaining unbalance is less than the allowable unbalance, the requirement can be completed. "

The questions raised by Li Xiaoran are more acute than the other.

However, Chen Qingxuan's expression did not change in the slightest.

He just closed his eyes slightly, his fingers on the table, tapping rhythmically.

I said all the correct answers.

And more importantly....

"Oh my God. "

"How did you do that?".

"Not a word. "

Li Xiaoran looked at the book in his hand in shock.

Chen Qingxuan not only said all the answers and principles.

What's more, there is not a single word wrong.

Li Xiaoran felt that she had been completely struck.

It's the feeling of a genius being forcibly pressed into the dust!

He gritted his teeth.

Simply pick up the thickest book on the side.

Turning straight to the last page, one of the hardest questions was asked.

Questions about modeling!

This problem not only requires theoretical support, but also requires a large amount of data calculation.

"Whew..."

After asking this most difficult question, Li Xiaoran couldn't help but exhale.

He felt a little ashamed.

"I didn't expect Comrade Chen Qingxuan to memorize the above questions word for word. "

"He just watched it so fast, is it unforgettable?".

"Genius!".

"This question is so difficult, I still ask it, isn't this deliberately embarrassing?"

"The front alone is shocking enough, and it's nothing if you can't answer this question. "

"It's that I'm narrow-minded. "

Li Xiaoran said ashamedly.

Just about to speak, I was going to say that this question didn't have to be answered anymore.

But before he could speak.

Chen Qingxuan's voice slowly sounded in the library.

"First of all, we should build an equivalence model and reduce the mechanical system just described to a single component, which we can call an equal component. "

"According to the principle of kinetic energy of the particle system, all the external forces and moment of inertia acting on the mechanical system are thought of being converted into equivalent components. "

"Secondly, the equivalent quantities are calculated, including the equivalent moment, the equivalent mass, the equivalent moment of inertia, and so on. "

Finally, the angular velocity function and angular acceleration function of the equivalent member are obtained through the equation, and the real motion law of the mechanical system is obtained. "

After speaking, Chen Qingxuan opened his eyes.

Pull out a piece of calculus paper directly.

Without thinking, write the formula on it, and substitute the data for calculation.

But only five minutes.

"This, this question is the most difficult question in the senior elective of Qinghua Mechanical Engineering, and it was actually calculated by you like this?".

Li Xiaoran and the senior sister opened their mouths wide.

The entire library fell silent, and everyone looked at each other in disbelief from what was happening in front of them.

Genius!

"I was wrong, I was wrong, Comrade Chen Qingxuan, I shouldn't have any doubts about you. "

"I'm sorry, I apologize to you!".

Li Xiaoran's face was full of guilt, shock, and his apologetic voice trembled.

The senior sister also came to her senses, covered her mouth and exclaimed, looking at Chen Qingxuan with complicated eyes.

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