industrial overlord

Chapter 416 Vibration Reduction
A cylindrical steel sample with a length of 120 mm and a diameter of 5 mm is suspended horizontally on two metal filaments. It is a variety of test equipment such as signal generators, signal amplifiers, oscilloscopes, and frequency counters.

Lin Fanghua and her junior sister He Xiaoyu stood in front of the test bench, meticulously conducting pre-test adjustments.Lin Fanghua's eyes were bloodshot, and her face was full of tiredness. If you observe carefully, you can see that her hands are shaking slightly, which is caused by fatigue after working continuously for a long time.

What they are doing is testing the vibration damping performance of metal materials.This test method is called the bending resonance method. The principle is that the signal generator first generates a vibration signal with the same natural frequency as the sample to excite the resonance of the sample.Then turn off the vibration source and record the free decay curve of the sample amplitude.The faster the amplitude of the sample decays, the stronger the internal friction of the material and the better its vibration damping performance.

Finding a steel with good vibration damping performance is a key part of this project to develop industrial steam turbines for driving ethylene compressors.The blades of industrial steam turbines have to withstand long-term, high-speed operation, and the vibration damping performance of blade materials is an important factor affecting the service life of blades.If the blades have poor vibration damping performance, high-frequency vibrations are likely to occur during operation, resulting in excessive noise of the steam turbine, and the blades are also prone to fracture due to fatigue.

The research on blade materials was undertaken by Professor An Zixuan of Huaqing University. Lin Fanghua was An Zixuan's assistant and was responsible for searching data and conducting post-material testing.According to An Zixuan's original estimate, it would take them about a year to complete all the work and come up with a steel that meets the requirements for vibration damping performance.But after learning that Lin Zhenhua had been suspended, Lin Fanghua took the initiative to ask Ying, threatening to produce applicable materials within three months.

There is a reason for Lin Fanghua to be so ruthless. She knows that she cannot help her brother in terms of social relations or politics. The only thing she can do is to use her own skills to help her brother.Large ethylene is a project led by Lin Zhenhua. If this project fails, those who pour dirty water on Lin Zhenhua will have more to say.Conversely, if this project is successful, Lin Zhenhua will become a hero leading independent innovation. Anyone who wants to attack him must re-evaluate his weight in the minds of the central leaders.

From then on, Lin Fanghua moved her bedroll into the reference room. The data staff in the reference room knew that she was Lin Zhenhua's younger sister, so naturally they couldn't stop her.Lin Fanghua bought four big steamed buns from the cafeteria every morning as a day's food, and then stopped going out, and buried herself in the reference room looking through the dusty Soviet materials.

No one knew how many hours Lin Fanghua slept every day in those days. The data workers only knew that she almost drank coffee as plain water, which kept her nerves in a high state of excitement.

In just one and a half months, Lin Fanghua digested tons of Soviet experimental data and mastered the Soviet Union's experience in developing vibration-damping materials.Combining the knowledge he learned during his study in the United States, Lin Fanghua proposed the idea of ​​developing vibration-damping alloy materials.

Just having an idea is not enough. The vibration damping performance of the damping alloy needs to be verified through experiments.Lin Fanghua wrote out a long list of experiments, and asked the steel factory to produce various samples according to different formulas and different heat treatment processes, and then tested them one by one in the laboratory.

An Zixuan sent several assistants to Lin Fanghua, who were PhD students and master students of Huaqing University.These assistants can help Lin Fanghua do material testing, but for the analysis of experimental data, Lin Fanghua needs to complete it himself.She has to revise her theory based on the test results of each formula, and then propose a new formula.This is a very complicated process, which tests the analyst's theoretical foundation and the degree of data accumulation.

Also, no one remembers how long Lin Fanghua stayed in the laboratory. They only know that several filing cabinets have been filled with drawing paper for recording the experimental results.Zhang Yihua, who is in charge of the overall design of the industrial steam turbine, has been here several times, and seeing the results of the experiment, he couldn't help being overjoyed, because several materials that Lin Fanghua brought out have reached the domestic advanced level and met his requirements.

But Lin Fanghua did not stop there. She once read in the literature that a laboratory in the United States had developed a vibration-damping alloy called Silentalloy, and its vibration-damping performance was among the best among all known alloy materials. .Lin Fanghua's goal is to develop a better material than Silentalloy, so that the performance of Hanhua's industrial steam turbine blades can reach the world-class level.

"Xiaoyu, are you ready?"

"Senior sister, get ready."

"let's start."

"Ok."

The signal generator was turned on, and He Xiaoyu skillfully adjusted the knob of the generator to make the signal generator generate signals of different frequencies.At the beginning, the sample vibrated slightly, but suddenly, the vibration became intense, which indicated that the current vibration frequency coincided with the natural vibration frequency of the sample, and the sample resonated at the same frequency.

"Turn off the vibration source and start recording the amplitude decay." Lin Fanghua ordered.

An oscillating curve appeared on the screen of the light-recording oscilloscope. It was shaped like the tip of a pen, wide at the tip, and then rapidly contracted to nearly a straight line.This rapidly shrinking shape shows that the material has a very high internal resistance, which is exactly the material property that Lin Fanghua is striving for.

He Xiaoyu took out a pen and recorded the time when the amplitude decayed by half, and then substituted it into the formula to calculate the internal friction value of the material.After pressing the calculator for a while, she excitedly waved the draft paper and shouted: "Sister, it's a success, it's a success! The internal friction value of our sample is 20% higher than that of Silentalloy!"

"Successful, finally successful." Lin Fanghua only felt a burst of ecstasy in his heart.In fact, this result was within her expectations. She obtained inspiration from the experimental records of the Soviets, and after going through hundreds of previous experiments, there is no suspense at all to get today's result.Even so, when she heard the data reported by He Xiaoyu, she still felt a kind of blissful dizziness. She suppressed her excitement and wrote in the experiment record:

"Sample formula: 13% chromium, 3% aluminum, less than 0.6% nickel, iron as the balance, high temperature annealing treatment, cooling with furnace method, slow cooling at 1000 degrees Celsius for 2 hours..."

After registering all the experimental data, Lin Fanghua signed his name at the end, and then said to He Xiaoyu: "Xiaoyu, send this experimental record to Zhang Gong immediately, he is waiting for our materials."

"No problem, Senior Sister!" He Xiaoyu continued to record the experiment, and ran out of the laboratory like a cheerful bird.

Lin Fanghua raised her head, wiped the sweat from her forehead, stood up with force, and walked slowly outside the laboratory.When she walked outside the door, she only felt that the sunlight outside was so glaring. She couldn't remember how long it had been since she saw the bright sunshine.

Brother, have you seen that I finally did it, and in three months, what I took out is the world's first-class vibration-damping material!

Lin Fanghua shouted loudly in her heart, and then, she felt her eyes darkened, and she fell to the ground.

……

Lin Zhenhua received this news when he was talking with Chen Tian. He jumped into the jeep Chen Tian gave him like crazy, and ran all the way to the hospital where Lin Fanghua lived.When he rushed into Lin Fanghua's ward, he saw Yang Xin and Ma Jie sitting on both sides of the bed, and it was the pale Lin Fanghua lying on the bed.

"Xiaofang, what's the matter with you?" Lin Zhenhua rushed to the hospital bed and asked, holding his sister's hand.

"Brother, I'm fine." Lin Fanghua had come to her senses at this time, and when she saw her brother coming, she forced a smile and replied weakly, "The doctor said, I may be a little anemic, and I didn't stand up right away. Just fell."

"Anemia? Why are you anemic!" Lin Zhenhua asked loudly.Only then did he realize that his formerly chubby sister was now so emaciated that it made people feel distressed. There was hardly a trace of blood on her face, and the two naive little dimples were gone.

"Yang Xin, what's going on?" Without hearing Lin Fanghua's answer, Lin Zhenhua turned to Yang Xin and asked.

"Xiaohua, I, I..." Yang Xin stammered a few words, tears streaming down her face, "Xiaohua, I'm sorry, I'm sorry... I didn't take good care of Xiaofang."

"It's not Yang Xin's fault." Lin Fanghua said, "Yang Xin often brings me food, because I don't eat well. Also, I may have stayed up too late, and I am a little tired."

"Don't eat well? Why don't you eat well?" Lin Zhenhua was puzzled. He didn't know what Lin Fanghua was doing in the research institute. Although Yang Xin told him about Lin Fanghua's hard work before, he couldn't think of it anyway. Lin Fanghua will survive to this extent.

"Xiaohua, Xiaofang has only slept three or four hours a day for the past few months in order to develop vibration-damping materials, and often forgets to eat. It's all my fault. It would be better if I didn't let her do this earlier. It's all my fault, it's all my fault ..." Yang Xin cried to Lin Zhenhua.She and Lin Fanghua are close friends in the boudoir, and at the same time Lin Fanghua's sister-in-law. Under her nose, Lin Fanghua was so tired that she fell ill and was hospitalized, and she felt that she was to blame.

Seeing Yang Xin crying sadly, Lin Fanghua quickly excused her and said, "Yang Xin, how can you blame this? When I was studying in the United States, I often did this, and I'm used to it."

Speaking of this, she turned to Lin Zhenhua and said, "Brother, I have good news for you. I have produced the damping material Zhang Gong wanted, which is even better than Silentalloy in the United States, and it is the world's first-class. Brother ,Are you happy?"

Lin Zhenhua understood everything at once, and his eyes were a little moist. He sat on the edge of Lin Fanghua's bed, stretched out his hand, stroked his sister's hair, and complained softly: "Xiaofang, who made you mess around like this? What? World-class materials, in my heart, how can your body be more important? I only have you as a sister, do you know?"

Lin Fanghua leaned her head on her brother's arm and said with a smile: "Brother, I only have you as my brother. You have been taking care of me for so many years, and finally I can do something for you. No matter how hard or tired you are , I am willing."

"You are really my silly sister!" Lin Zhenhua's tears finally flowed down.Since he was suspended, there have been many people who have cared for him and helped him. All these camaraderie have touched him very much, but he has never shed a tear.At this moment, he shed tears, because of the true love that blood is thicker than water.

(End of this chapter)