Zheng Guolin is not exaggerating at all.

Increasing the shock-absorbing floating raft is an important measure for submarine noise reduction, but how to set it up and how to set it up, the Ship Machinery Research Institute responsible for this subsystem is blind and does not know at all.

Although some results have been achieved with a little tenacity, most of them are not quite in line with the actual situation, and some are even counterproductive.

However, this "investigation" of the Argosta-70 submarine directly made Zheng Guolin, who had been behind closed doors for several years, instantly find the direction.

In the past, Zheng Guolin and his family thought that the shock-absorbing floating raft was similar to the device on the river cruise ship of Endeavor Factory, using springs or special rubber as a medium to cancel out the mechanical noise of the engine.

After visiting the French submarine, I found that it was completely different from the previous way of thinking, and whether there was a shock-absorbing floating raft or not, but it was not directly installed on the submarine's cabin.

Instead, the raft is supported to the hull by means of a vibration isolator, in other words, the valve body is not in direct contact with the hull, but is suspended in the air by the support structure.

As for the vibration isolator supporting the raft, the hydraulic principle is used instead of the hard spring, so that the support structure can absorb the potential energy generated by the engine to the greatest extent, so as to achieve the purpose of reducing noise.

But it is not enough, because the contact and friction between the various structures will also produce unnecessary noise, so the French submarine is equipped with several layers of damping materials made of special rubber on the contact surface of the engine, raft, vibration isolator and so on, so as to minimize the vibration.

Not to mention, the system pipes in the boat are not directly connected to the hull, but are installed on the hull by elastic connecting pipes, so as to minimize the vibration of the pipe wall.

All in all, the French submarine is far stronger than any other type of submarine in China in terms of structural noise reduction, and Zheng Guolin's "inspection" can be described as both happy and urgent.

Glad to have a clear reference and idea in terms of structural noise reduction, this time I will definitely make good progress in this regard.

As for the urgency, it is not difficult to understand that the Agosta-70 submarine is, after all, a product of France in the 70s, and although it has adopted a lot of technology from the French "Ruby" class nuclear submarines, it still cannot change the essence of its technical level in the 70s.

But even so, the country still can't reach the technical level of others, such a gap, Zheng Guolin is not in a hurry to see the hell.

In fact, it is not only Zheng Guolin who is also anxious, but also Jiang Huaimin, although this sonar technology expert does not seem to be as wasteful as Zheng Guolin, but the shock is not bad at all.

In particular, the reconnaissance sonar in the sonar base array on the boat was simply subversive to Jiang Huaimin, an old expert.

Because this set of low-frequency passive ranging and reconnaissance sonar is not ordinary sonar in the traditional sense, but a special sonar specially used to identify target information and torpedo warning.

In other words, this sonar can not only accurately determine the specific model of enemy ships and submarines through different acoustic signals, but also provide the approximate model of incoming torpedoes and corresponding early warnings.

This set of things doesn't seem to be a big deal, isn't it just the specific recognition of acoustic signals, as long as the sonar can be made more precise, and the calculation and processing are faster, it is not a difficult task.

It is true that it is not technically difficult to achieve this, but it is not technically possible to accurately determine the specific model of a ship, submarine and torpedo from complex acoustic signals.

Rather, it is necessary to accumulate over the years and constantly collect and sort out the acoustic signals of the ships and torpedoes in service in various countries around the world and then make a very detailed database, so that it is possible to quickly judge the specific situation of the enemy in actual combat.

Because of this, the key to this sonar setup is not the technology, but the voiceprint database that can identify the specific situation of the enemy target.

In this regard, China is really poor, and in addition to the voiceprint information of its own submarines, there is no voiceprint information of other countries' ships, submarines and torpedoes.

It's good to say in peacetime, if it comes to wartime, a submarine that lacks the support of voiceprint information, and a submarine with the help of a voiceprint database, is simply like a myopic eye meets the air force eye, and before you can see what's going on, people will figure you all out, and then needless to say, it must be three times five divided by two to be beaten into a pig's head.

Jiang Huaimin did not conduct in-depth research on this issue, but only focused on the improvement of sonar technical performance, and as a result, this "investigation" found that even if your sonar sensitivity is so high that you can hear a needle drop, the actual combat effect may not be much better.

Because you can hear the sound of the needle dropping, you don't know what the size of the needle is, how long it is, and whether the tip of the needle is sharp or not.

This will inevitably affect the judgment of the submarine commander, and it will inevitably require further detection, or even repeated detection at the risk of reaching at risk.

However, if there is a detailed voiceprint database, it is different, don't just judge the model of the ship or torpedo, as long as you do your homework in advance, you can find the advantages and disadvantages of the equipment, and then formulate a targeted combat plan.

It's just that this kind of voiceprint database is easy to say, but it is very difficult to do, because it requires the navy to collect the specific acoustic signals of ships and torpedoes of various countries in peacetime.

However, it is not possible to obtain these acoustic signals overnight, and it requires the continuous investment of the entire navy and even the entire country to accumulate little by little.

Of course, now Jiang Huaimin can take a small shortcut through the voiceprint recognition database in the sonar recognition memory in the Agosta-70 submarine in France.

However, after all, the threat faced by France is different from the actual situation in China, and international arms sales have always been to leave a few hands on the core technology, so the value of the voiceprint database in Pakistan's submarines is not as great as imagined, so after returning to China, it is necessary to persuade the navy to increase investment in this direction and build China's own voiceprint recognition database as soon as possible.

Also preparing to return to China to convince the Navy was Niu Jun, deputy director of the Radar Electronics Research Institute, who was drawing up a structural diagram of the integrated command system for submarines in a hotel.

The French Agosta-70 submarine is capable of tracking eight targets at the same time through the combat command system on board, and can simultaneously guide torpedo attacks and attack four of the most threatening targets at the same time.

Domestic submarines do not have this capability at all, and can only attack one target one-on-one, so compared with French submarines, the combat efficiency of domestic submarines is really low.

But there is no way, it is really because China is as simple as a newborn baby in the submarine combat system, and now it is okay, with this "investigation" Niu Jun quickly understood the structure and specific composition mode, and the rest is to see how to build it back.

All in all, the impact of this investigation on the experts is huge, but the gains are also immeasurable, which also makes Meng Jianye very pleased, after all, these gains will not be long before they can become a lot of dollars, which is not too valuable.

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