There is already a large group of people waiting for them here.

When we arrived, it was already evening. The day had been too stressful. We stayed at the guest house of Ruby Design Bureau for one night. The contact between the two parties officially began in the morning of the next day.

"Welcome everyone." Yuri Nikolayevich Kormlison, the head of the Ruby Design Bureau, said with a smile on his face: "We have been waiting for you here for a long time."

"Yes, we also want to come here as soon as possible." Qin Tao said with a smile: "See our Warsaw women as soon as possible."

"Women of Warsaw?" Cole Millison said with some surprise: "Our submarine 636 is codenamed Song of Warsaw!"

This chapter is not over, please click on the next page to continue reading! What?

Qin Tao was a little embarrassed. Is this code name wrong?

Lao Maozi's various weapons also have their own code names. For example, the 877 submarine, their code name is Flounder. Therefore, Lao Maozi often talks about "flounder", and he will definitely not say "such and such" Kilo class.

, the latter is the code name of NATO.

The Type 636 submarine is also a Kilo class. NATO thinks so, it is just a modification of the Kilo class. However, Lao Maozi already thinks this is a brand new submarine, so in addition to the number 636,

Lao Maozi also gave it the code name Song of Warsaw.

However, I don’t know how it spread, and when it came to Qin Tao, she became a Warsaw woman.

"However, the title of Warsaw woman is not bad." Cole Millison continued: "Our submarine is like an underwater mermaid."

Boy, it seems like this must be a relatively friendly meeting.

Everyone entered the conference room in an intimate and friendly atmosphere.

"First of all, let me introduce to you the overall design of our 636 submarine so that you can have a deeper understanding of this submarine. It is also my most proud work." Cole Millison said, opening the slide projector.

Cole Millison, who was born in 1932, grew up in a shipbuilding family. Therefore, he was very interested in shipbuilding, especially submarines. After graduating from college in 1956, he entered the famous Ruby Design Bureau.

An ordinary engineer worked his way up to chief designer step by step, and participated in the development of four generations of Soviet submarines. Especially the development of the 877 submarine. He was already the chief designer of this project at that time.

Therefore, after Bazarov died, as Mao's meritorious designer, he was promoted to be the general manager of the Ruby Design Bureau. The first thing he did when he took office was to prepare for the arrival of Eastern guests and promote the latest 636 submarine

go out!

Thinking of his taking office, he felt very emotional. If Bazarov could be more patient and less desperate, he would be able to wait for the bright future.

The Chinese came to place orders. Their design bureau and shipyard were all saved. Half of the people in St. Petersburg were waiting eagerly for it.

Bazarov died before dawn!

The internal structure diagram is marked in great detail! Deng Rui looked at the design drawing carefully, trying to memorize the entire drawing in his mind.

"You have already seen the 877 submarine. From the appearance, it is difficult to distinguish the two submarines. In fact, our 636 submarine is only 1.2 meters longer than the 877 submarine, and its displacement has increased to more than 3,100 tons.

The added part, the shell has been lengthened by 1.2 meters, and the hull has grown to 73.8 meters. The added part is mainly used to install more sophisticated and complete turbine sound insulation and vibration reduction base and bulkhead sound insulation measures. After some improvements, our 636 model

The noise of the submarine sailing at full speed has been reduced to about 118 decibels."

When hearing this sentence, everyone was shocked: "Only this low?"

Low?

The national noise standard is 55 decibels. The noise of 100 decibels is the sound of an electric drill drilling into a wall or an electric saw cutting wood. 120 decibels is even more terrifying. People are exposed to this kind of sound environment for a few minutes.

It can cause deafness.

The decibel of a submarine is 118, but it is still said to be low?

There are many technical issues in this.

When a submarine is sailing at low speed, the sound it emits will be very low. When it remains silent, there will be no sound. As the speed increases, the noise will increase rapidly.

Secondly, these noises are not heard by sailors inside the submarine. In the entire submarine, only the noise in the engine room is slightly louder. After all, there is a diesel engine rotating inside. Of course, with the advancement of technology, the vibration of the diesel engine

It is also reducing the noise. If an advanced German diesel engine is placed on the carpet and started, people in the next room can sleep quietly. As for nuclear submarines, the source of noise is the circulating water pump.

However, these noises are only part of the noise produced by submarines. The larger noise comes from the propellers. The propellers stir up the sea water, produce bubbles, make a swishing sound, and may even resonate within a certain speed range.

This is the most terrifying killer for submarines. It has a nice name called "singing sound". It is the unique identification feature of each submarine. The singing sound is also called "voiceprint" and has a high

Information value.

Of course, it's not just the propellers, but also the sound of water hitting the surface of the submarine, and these sounds are all propagated outward.

These are all technical problems, but sound is caused by vibration. When it propagates in seawater, it travels faster than in the air and attenuates faster. After all, vibration propagating in the air is absolutely different from ship vibration in seawater.

Not of the same order of magnitude.

"The Romance of Fairy Wood"

Even if the Kilo-class sails at its highest speed, it emits a noise of 118 decibels, which propagates in the ocean. Except for the subtle low-frequency noise that can be heard dozens of kilometers away, nothing else can be heard.

Of course, there is another most important reason, that is, the decibels in sea water are different from those in the air. If converted, the decibels in sea water are 52 lower than those in the air. Therefore, the decibels under water minus

52, is the same volume in the air. (Thanks to book friend Xishan Tengqiang for his advice.)

Therefore, the noise of the Kilo-class submarine is 118 decibels. When converted to land, minus 52 is 66, which is not high anymore. It can be regarded as a black hole in the ocean. The noise of the Los Angeles-class submarine is 128 decibels, while the noise of the domestic 091 submarine

It reached 170 decibels and was called a submarine tractor.

As for the movie, in order to avoid being discovered, even speaking in a low voice is not necessary at all. However, the knocking sound can be transmitted, so there is indeed a sound when a coin falls, but being able to tell which side is up is a stroke of genius.

.

This chapter is not over yet, please click on the next page to continue reading! Nowadays, the noise of 118 decibels is already very low.

Therefore, everyone was surprised when they heard this introduction.

"Yes, through our careful design, the noise has been reduced to the order of magnitude of the ocean background noise." Cole Millison said proudly: "Now, let's first introduce its noise reduction technology."

The length they increased is mainly used to reduce noise. For a submarine, this is very important and is directly related to its life and death.

After all, for submarines, concealment is the first priority. Once discovered, the consequences are unpredictable.

The slide of the power cabin was released.

In order to reduce noise, the entire power cabin uses "floating raft vibration isolation and noise reduction technology", that is, multiple different machinery and equipment are arranged in a compact space and installed on a common raft body or raft frame to flexibly support or

Suspended on the hull structure. Since it is not rigidly connected, this greatly reduces the transmission of vibrations.

In the past, the diesel engine drove the propeller directly through the transmission shaft, which would cause the vibration of the engine to be directly transmitted to the outside through the transmission shaft. This has long been abandoned and electric transmission technology is used.

"The power system is basically the same as that of the 877, but in order to increase the speed, we upgraded the original two 1,000-kilowatt diesel engines to two 1,500-kilowatt diesel engines, PG-142 low-speed cruise generator sets and two

The emergency diesel generator set remains unchanged. As for the battery, we have upgraded it to the latest model 476, with a capacity that is 1.5 times the original and a lifespan that has been increased from two years to five years."

Although Lao Maozi's submarine has good performance, there are also many pitfalls. Submarines mainly rely on batteries for underwater navigation. The capacity drops drastically after two years, and the batteries need to be replaced with new ones, just like the batteries of electric cars.

The new battery can last for five years and its lifespan has been increased by 2.5 times. This is quite an improvement.

"Yeah, not bad." Everyone nodded.

"Let's introduce its command and control system again. By the way, in order to guide the cruise missile, we still need to update it, so the delivery time to you may be extended."

"We can afford to wait." Qin Tao said generously.

Qin Tao certainly knows that the basic version of the 636 cannot launch 3M-54 cruise missiles. After all, this kind of submarine was designed in the late 1980s, and the missile was only successfully test-fired this year. Therefore, there is no

Matching.

The real supporting equipment will not be available until the 636M, which is the improved version. The old man was forced into a hurry and risked his life in order to sell weapons to support St. Petersburg!
Chapter completed!