pertwk Chapter 10 This is simply a scientific research sanctuary
Chapter 10 This is simply a scientific research sanctuary
Just as Zhou Mingyuan was about to say something, the familiar footsteps echoed down the corridor again.
Li Hongde pushed the door open and saw four people huddled in front of the computer by the window. He paused for a moment.
"What's wrong? Are you having a problem?"
His tone was calm, but his eyes had already swept over Lu Feng. In his opinion, it was normal for a freshman to encounter setbacks on his first day in a group; it would be abnormal if he didn't encounter any setbacks at all.
The purpose of assigning that task was to let Lu Feng familiarize himself with the process first, and to deliver a decent result within a week would be considered satisfactory.
Zhou Mingyuan turned around, his expression subtle, like a mixture of constipation and winning the lottery.
"Teacher, I'm so discouraged."
Li Hongde was taken aback: "What do you mean?"
Zhou Mingyuan didn't explain, but simply stepped aside and gave up his spot to display the screen.
Li Hongde walked to the computer, bent down and glanced at the screen.
The folder contains the processing results of four sets of data, simulation comparison reports, and parameter modification instructions.
He didn't speak, but clicked on the first data comparison chart.
The curves of the measured data and the simulation results almost overlapped, and the peak positions of several key meshing frequencies were exactly matched.
Li Hongde's hand remained on the mouse without moving.
He then opened the parameter modification instructions and read them from beginning to end.
The reasons for re-identifying the damping coefficient, the correction scheme for time-varying meshing stiffness, and replacing the ideal involute assumption with measured tooth profile error.
Each item is written concisely and clearly, with the derivation process attached to the key steps.
The office was so quiet you could hear the computer fans humming.
Zhao Pengfei stood to the side, his expression somewhat complicated.
He built that model, and after running it for over a month without being able to reduce the deviation, someone else solved it in one morning by changing just two parameters. It would be a lie to say he wasn't upset, but he was mostly impressed.
Li Hongde straightened up, pushed up his glasses, and looked at Lu Feng with a completely different gaze than he had in the classroom yesterday.
"Did you finish all of this in just one morning?"
"Yes." Lu Feng scratched his head.
Li Hongde nodded and didn't ask any more questions, but his heart was in turmoil.
He looked at Lu Feng with eyes full of fervor.
Completed a week's worth of work in one morning, this is simply a scientific marvel!
This gave Li Hongde a look that triggered Lu Feng's reaction: "Teacher, I'm not gay."
Li Hongde took a deep breath, calmed himself down, then glanced around at everyone in the laboratory and made a decision that went against his ancestors' wishes.
"Everyone, go to the conference room next door for a short meeting."
Zhou Mingyuan and the others looked at each other in bewilderment.
The formal group meeting is every Friday afternoon. Today is only Wednesday, and an extra meeting has been added. This is unusual for Li Hongde.
The meeting room next door wasn't big; it had a long table, eight chairs, and a whiteboard on the wall.
The window was open, and the leaves of the sycamore trees outside rustled in the wind. The five people sat down in turn, with Li Hongde standing in front of the whiteboard, his arms crossed.
"Lu Feng, don't be nervous." Li Hongde's tone softened considerably, even carrying a hint of expectation that he himself didn't realize. "Just briefly tell us what you were thinking when you were making this model. Say whatever comes to mind."
Lu Feng nodded.
"Teachers and senior students, I think the core difficulty of this project lies in the strong nonlinear characteristics of the dynamic behavior of the gear system at high speeds. Traditional linear models are effective at low speeds, but once the speed exceeds a certain threshold, the simulation results will deviate significantly from the actual working conditions because the changes in damping and stiffness are ignored."
Zhou Mingyuan and the others involuntarily sat up straight. What was originally a somewhat spectator-like mentality was instantly drawn into his logic.
"So, when I was building the model, I made two main corrections." Lu Feng picked up a marker and wrote the first formula on the whiteboard.
"First, a nonlinear damping term was introduced. I referenced some theories on high-speed shear damping in fluid mechanics and constructed a damping function that is related to the square of the velocity. This allows for a more realistic simulation of the energy dissipation characteristics of the lubricating oil film at high speeds."
He then wrote down the second set of derivations.
"Secondly, regarding the calculation of meshing stiffness, the software's built-in stiffness calculation is based on empirical formulas, which have limited accuracy. I used the variational method to unify the contact deformation and bending deformation of the gear teeth into a single functional for solution."
He spoke slowly but clearly and logically, breaking down complex theoretical issues in a way that was easy to understand.
Li Hongde's eyes grew brighter and brighter, and he even took out his notebook to start taking notes on several key points mentioned by Lu Feng.
This kid is not only good at operating software, but he also has a profound understanding of the essence of the whole problem that far surpasses that of his peers!
When Lu Feng finished explaining the last detail and put down his marker, applause rang out in the conference room.
It was Li Hongde who was clapping.
"Great! Excellent!" Li Hongde made no attempt to hide his praise. "Your thinking was clear, your logic was rigorous, and especially your understanding of nonlinear problems, Lu Feng, you gave me a huge surprise."
Zhou Mingyuan and the others clapped along, but their applause was mostly numb.
Is this a freshman?
They'd believe it if you told them it was a doctoral thesis proposal!
"Did you encounter any difficulties while doing it?" Li Hongde asked.
Lu Feng thought for a moment and said the truth: "Teacher, that computer is a bit strained."
"When running the simulation of the fourth set of data, it froze three times, and each time I had to force it to close and start over. If we were to do parameter scanning or Monte Carlo simulations on the fourth set of conditions, the machine's memory and processor wouldn't be able to handle it."
Li Hongde turned to Zhou Mingyuan: "Mingyuan, make a budget; that computer needs to be replaced."
Zhou Mingyuan's lips twitched, and he almost burst into tears.
That computer by the window is the highest-spec one in Lab 302. Zhao Pengfei used that computer to run simulations last year, and he even added more RAM to it.
Lu Feng complained about the slowness on his first day here, and the key point is that Li Hongde approved it directly. He had used his laptop for three years, and the paint on the F key on the keyboard was worn away, but he was too embarrassed to say anything even once.
A freshman, joining the crew for the first time.
He accomplished in half a day what others do in a week, and incidentally identified the core flaws in the model.
Zhou Mingyuan lowered his head and wrote the budget in his notebook, with only one thought in his mind.
I'm sticking with this big shot, and I'm going to swoon over this junior brother.
Li Hongde glanced at his watch; it was 11:40.
"Alright, there are still twenty minutes before class starts, you guys go eat quickly."
As the group began packing, Li Hongde called out to Zhou Mingyuan, who was about to leave.
"Write down Lu Feng's bank card number later, and start sending him the allowance from this month."
"Those who do things should be rewarded."
Lu Feng paused for a moment.
allowance?
Each supervisor's research project has funding, and students participating in the project receive a monthly stipend, the amount of which varies depending on the size of the project and the supervisor's style.
But this is usually for graduate students. Undergraduates are lucky if they can get some resources and learn something when they join a group. He had never heard of anyone getting a stipend in his previous life.
But since they're offering it, I'll just take it. After all, it would be foolish not to take money when it's available.
Li Hongde walked out with his notebook tucked under his arm, his voice echoing back down the corridor.
"Zhou Mingyuan, this month we'll pay you according to the standard for a first-year graduate student."
Zhou Mingyuan stood at the door for two seconds, then turned to look at Lu Feng. The expression on his face was no longer a bitter smile, but pure numbness.
No, how could this person be so twisted?