don't call me singer

Chapter 194 Gu Xiaobai, please use a scientific method!

"Xiaobai, I'm here to drop by!" Zhao Xingsheng followed Xia Cong into Gu Xiaobai's laboratory with a large bag of various snacks.

Gu Xiaobai's laboratory has opened, so it is necessary to celebrate.

When he entered the door, he saw two bald-headed professors inside, typing in front of the computer, as if they were doing paperwork.

Gu Xiaobai was sitting in his room, reading a book.

Zhao Xingsheng walked in with snacks, took a closer look, and found that Gu Xiaobai was reading a few books on electromagnetism, and was still writing and drawing beside him.

"Aren't you guys doing acoustics? Why are you still studying electromagnetism?" Zhao Xingsheng wondered.

"Oh... Acoustics and electromagnetism are actually interlinked." Gu Xiaobai said.

Zhao Xingsheng: "?????"

I'm a liberal arts student, I don't study much, don't lie to me.

Gu Xiaobai was writing and drawing next to him, not knowing what formula he was deriving, or what he was calculating, while explaining to Zhao Xingsheng:
"In fact, the two can be calculated with the same formula. In the 19s, the German physicist Helmholtz obtained an equation 70A + k2A = 2 after separating the variables from the wave equation of electromagnetic waves..."

Do not understand.

Vaguely, Zhao Xingsheng felt the fear of being dominated by Gu Xiaobai's flute formula last time.

He wanted to run away now.

"The 2 in this equation is what we usually call the Laplace operator, A is the vibration mode (or natural mode), and k is the frequency (or natural frequency) corresponding to this mode."

What?We don't usually talk like that!Isn't Lapras a Pokemon?
"This equation is not only applicable to electromagnetic waves, but also to membrane vibrations, and even string vibrations, because strings are one-dimensional, membranes are two-dimensional, and electromagnetic waves are three-dimensional. They are all vibrating and follow the same law."

I probably understand this.

It turns out that things in this world are always changing.

"For general vibration problems, it is given the shape and mass distribution of the object to find the natural mode shape and frequency of the object. The formulation of this kind of problem is called a direct problem."

"Now we can do the reverse. If we know the natural mode shape and frequency of an object, we can know its shape in reverse..."

"The way the membrane vibrates, unlike the string vibration, can be seen as superimposed sine waves. Its mode shape is very complex, and this mode shape affects the timbre of a drum."

"Then some heavy objects are dotted on the drum surface to suppress a certain vibration mode of it, so that the sound of the drum can be made better..."

Zhao Xingsheng still understands this, tune the drums!
Moreover, with the same drum, some people sound good when it is played, and some people sound bad when it is played, because of this.

The timbre is different depending on the strike position and intensity.

Tone control is always the most important and difficult skill.

However, modern people don’t often use it this way. Modern people usually develop more suitable materials, or control the thickness changes of the materials themselves to suppress some bad waveforms.

But in the words of the ancients, there is definitely no way to do this.

"So you are reducing your workload by calculating?" Zhao Xingsheng understood.

"You can say that." Gu Xiaobai said.

"Then consider the problem of the material itself. The skin used for the drum is the skin of the alligator. The alligator belongs to the genus Alligator, which is alligator. There is only one kind of alligator in China, which is the alligator. But the skin of the alligator is If it is illegal, we can only take the next best thing and use the belly skin of the American alligator to make the drum. The size of the American alligator is larger than that of the Chinese alligator, so we must choose young alligators.” (Note 1)

"In addition, in the remains, a large number of bone plates of the alligator were found, that is to say, the ancients' tanning of the alligator skin was very shallow, and there were still a large number of bone plates, which were not as soft and soft as modern crocodile skin. The edge of the drum actually has a certain thickness and hardness. The middle abdomen has a slub pattern, and the part of the skin that is not ossified is softer. Therefore, the drum should be a situation between plate vibration and membrane vibration, and the outer ring plate vibration , the inner ring is more similar to membrane vibration..."

"Two different vibrations are compounded together, which also creates a very peculiar sound, which is not the same as other drum sounds." (Note 2)

Zhao Xingsheng nodded again and again, it sounds like what Gu Xiaobai said is very reasonable.

"Okay, Xiaobai, you guys have made a splash so quickly!" Zhao Xingsheng praised.

Sure enough, he is worthy of being Xiaobai. Even if Gu Xiaobai did not win the project this time, this kind of valuable experience, as well as the process of seeking proof and seeking knowledge, is also a very valuable asset.

The teacher must be very happy to see Xiaobai making such progress again.

At this moment, another door opened, and Qin Chuan poked his head out from inside: "Xiaobai, you can come and tune!"

tuning?

What the hell?

"Here we come!" Gu Xiaobai entered another room, and saw Qin Chuan, senior sister Jing and the four single dogs from 306 all there.

Gu Xiaobai didn't have many people who could use it, so all his friends came to help.

There are also various tools and two hollowed out tree trunks inside.

A piece of crocodile skin cut into a circle was covered on the hollowed out tree trunk.

"Where did you get the crocodile skin?" Zhao Xingsheng stared.

Crocodile skins are known as gold in skins, especially these few crocodile skins, which are all back-opened and have almost no flaws on the abdomen. It can really be said that the price is more than [-] per piece, and there are at least seven or eight pieces on site.

How much is this?
There is always 100 million.

"Brother Han has a friend who opened the largest leather foundry in our country and sponsored me these few photos." Gu Xiaobai said.

This is the price of paying a letter to buy "Zhu".

Absolutely bleeding.

"What about other funds?" Zhao Xingsheng asked again. Now in Gu Xiaobai's laboratory, there is no fund at all.

And without applying for a project, the funds of the laboratory cannot be used casually.

The current project funding supervision is unprecedentedly strict.

You can look at the various tools and instruments at the scene, and there are not many of them. It seems that this room has been directly arranged into a complete studio.

"Sponsorship for dormitory fees in 306." Zhou Xianting raised his hand beside him.

306 dormitory fees?These tools, wood, and labor costs are not small amounts. How can there be so much money for dormitory fees?
and many more……

306 Sheriff?Doesn't that mean...it's the funds earned by 306 singing so many times?
In fact, there are not many rewards for selling singing, even if it is 306 singing singing group, the money that can be received on the spot is at most a few thousand.

But the 306 Singing Group, which has been stalked every time, has so far had three shows on "Singing the Street".

Every time Director Shi said that he would have to pay, considering the current popularity of "Fanging on the Street" and the resulting advertising revenue, how much is this money?
How much does Director Shi have to pay to continue Gu Xiaobai's performance?
I'm afraid Dongyuan University's largest dormitory was born!

Zhao Xingsheng shook his head.

The kids these days are... really amazing.

Then he focused on what was in front of him.

The tanning of these crocodile skins is not particularly exquisite, and there are still some bone plates and hardness, which simulates the state of tanning in ancient times.

After all, what is needed to restore a musical instrument is not perfection, nor improvement, but its unique style and timbre.

The drum is a very distinctive kind of drum. In this world, which drum is covered with crocodile skin?I am afraid this is the only one.

In order to adjust the sound, dozens of different clips are used to fix the crocodile skin around. The clips are connected with tension-adjusting bolts, which pull down the crocodile drum skin and cover it tightly on the hollowed out tree trunk.

Gu Xiaobai stepped forward, stretched out his hand, and tapped lightly.

The sound of "Fengfeng" came out, and the tone was bright in the dark, which was very strange.

"The pitch is a little lower, so make it tighter." Gu Xiaobai said.

Qin Chuan adjusted the tension, Gu Xiaobai tapped it again, nodded, and said, "It's almost there, tighten the No. 12 bolt by half a turn, and loosen the No. 27 bolt by half a turn."

Continue to adjust.

Gu Xiaobai tried the sound again, and the pitch was almost the same, so he began to adjust the tone.

If so again and again, Gu Xiaobai felt that there was no problem.

Then he stretched out his hands and slapped the drumhead, sometimes cutting half or a third of the drumhead with one palm, and beating the edge with the other hand, testing the timbre of each edge.

The rhythm of "moving, big, hitting, hitting" sounded.

Gu Xiaobai's rhythm is not particularly proficient, after all, he has never been exposed to percussion instruments before.

"Xiaobai, your drums are not as good as mine!" Wang Haixia laughed at Gu Xiaobai from the side, but Gu Xiaobai rolled his eyes.

But Zhao Xingsheng listened to him with mixed feelings.

This simple rhythm has traveled through thousands of years.

It was like an ancient ancestor beating his chest.

"No problem, this drum head is fixed, and then we change the bottom."

Gu Xiaobai didn't have time to sigh, he continued to make drums.

Now, this drum is still a long way from being fully restored.

The bottom of the drum, usually used to resonate, but there are also drums that are struck on both sides.

This is not the case with the drum, which is mainly about resonance.

But Gu Xiaobai still tapped to listen to the tone and kept adjusting.

In less than half an hour, the four sides of the two drums were fixed. Gu Xiaobai knocked for a long time, felt it, nodded, and said: "Okay, you can put the shell decoration and paint Painted."

"Okay, leave it to us." Qin Chuan licked his lips and started to work.

This kind of work is what he is good at.

He directed several other single dogs in dormitory 306, polished the shells into a fixed shape, and embedded them in the pre-dug positions on the drum body one by one.

The abstract and simple animal face pattern appears on the drum body.

"You...you just restored the drum?" Zhao Xingsheng felt a little skeptical about life.

"That's right." Gu Xiaobai said, "You think, if we compete in a serious manner, we will definitely not be able to compete with Teacher Deng from the Institute of Acoustics."

"So... you plan to rush in with the drum at that time?"

"Hmm... After all, no amount of theory can compare to reality, right?"

"Then...the theories you told me before..."

"Oh, when the time comes to fool the judges, I can't say that the drum was restored by my ears."

Zhao Xingsheng: "..."

After talking about the theory for a long time, in the end, all the acoustic foundations are just your pair of ears?

At this moment all he wanted to do was growl.

This is Gu Xiaobai Acoustics Laboratory?

This is obviously Gu Xiaobai Er's Metaphysics Laboratory, okay?

Student Gu Xiaobai, you are a scientist!

Please use scientific methods and compete with dignity!
This is not good, very bad!
Gu Xiaobai stretched out his hand, and lightly tapped the two drums a few times. In his memory palace, the complex vibration shapes were constantly changing and superimposing.

The music library system has been upgraded again!

It's true that he relied on both ears, but it's impossible for other people's ears to hear the vibration mode.

This is his trump card.

(Note 1: According to the information I read, commercial use of Chinese alligator is prohibited, and the existing population has problems of inbreeding, making it difficult to continue the race, but the news also said that Chinese alligator meat can be eaten, and there is also a plan to "raise crocodiles with crocodiles". However, there is no alligator skin in the market. It should be because the scale is not large, so you don’t want to harm your own alligator, but go to harm others.)
Note 2: The content of this chapter is fabricated by Uncle Ha based on acoustic data, archaeological data and research on crocodiles, please do not take it completely seriously.In addition, I always feel that the restored drums cannot be called drums at all.You don't use crocodile skin to cover it, but just imitate it, can it be called a drum?Different materials, can the sound be the same?right?Of course, using crocodile skin is too expensive to afford...

Note 3: When looking at the materials, I saw many stories about the alligator, which was embarrassing.This guy is really a stupid and cute thing, but it's a pity that he is too ugly, otherwise he would be a roll. )
(End of this chapter)