The staff opened the box again, and the deafening sound of firecrackers woke Li Rujin up, Li Rujin had a feeling, just now, was his ears deaf? How could there be no sound so loud in an instant?

The box was closed again, and there was silence between heaven and earth once again. Li Rujin knew that this time it was not his deafness in his ears, but another invention made by the R&D team.

The box was opened again, this time there was no deafening sound of firecrackers, the firecrackers had already been released, Li Rujin waited for the smoke in the box to dissipate, walked over quickly, took the tin bucket of the box and threw it out, and then carefully studied the box.

The box was very light, less than ten catties, and Li Rujin could easily hold the box up with one hand. The inside of the box is full of small holes, densely packed, and the small holes are hexagonal, like a honeycomb, if you have a dense phobia, it will definitely be uncomfortable to see.

Li Rujin touched the small holes with his hand, and the material of these small holes was not metal, it should be something like paper or plastic. Li Rujin turned in a direction so that the sunlight could shine directly on the hole, so that he could see the internal structure of the hole.

Inside the small hole is no longer hexagonal but conical, and at the bottom there is a wire attached to the back of the honeycomb. Li Rujin saw these small holes, and he understood the principle of silencing this box in his heart, this kind of silocene structure, he had seen in his previous life, was the silencing tile of the cavity structure, but the effect was far less good than this effect.

When the firecrackers went off just now, the decibels should be above 120, maybe 130 decibels, but after the lid is closed, the sound drops to only about 30-40 decibels, which is a terrifying drop.

Sound can travel in a variety of media, such as air, water, steel, soil, and many more. Therefore, it is very troublesome to eliminate the noise, and it is quite difficult, how much did the Republic pay in order to eliminate the noise on the submarine in the previous life, even if the most advanced hole sound-absorbing tile - shark skin was used, but the noise decibel number of the latest nuclear submarine was still above 90.

Therefore, the appearance of this box made Li Rujin extremely interested, because its effect far exceeded the silany effect of shark skin.

This technology is simply against the sky! You must know that before Li Rujin crossed, the Dawen Empire did not attach importance to the silencing technology, which can be said to be a blank, and later after Li Rujin developed a new type of tank, there were some related technologies and means, mainly to use silencing cotton to come and go noise.

Now that such an anti-heaven thing has suddenly come out, can Li Rujin not be excited? Li Rujin was almost reluctant to let go of the box, and finally under the persuasion of the staff, this guy reluctantly handed over the box to the staff, and kept telling the staff that they must be careful, be careful.

Back in the laboratory, Li Rujin couldn't wait for the staff to disassemble the box, he wanted to understand what mystery was hidden behind the honeycomb, which could greatly reduce the sound wave, so as to achieve the purpose of sound elimination.

The box was dismantled, revealing the back of the honeycomb, which was a metal mesh with nodes corresponding to the wires behind each of the holes. Li Rujin looked at the metal mesh and wondered in his heart, could it be that these metal nets are working?

The staff next to him explained that it was indeed this metal mesh that worked, but it could only work after the metal mesh was energized, and after speaking, the staff flipped a small switch on the box, and then the metal mesh vibrated slightly.

The amplitude is not large, but the frequency is very high, but Li Rujin still does not understand the mystery in this. At this time, another staff member explained to Li Rujin how the box worked.

When the sound wave reaches the bottom of the hole, the sound wave has been decomposed and weakened a lot, at this time, the metal mesh behind the honeycomb is powered on, and the high frequency and bottom amplitude of the wire vibrate up, so that the wire in the hole vibrates with the same amplitude and frequency. Sends out mechanical shock waves.

Then, high-frequency mechanical shock waves are used to eliminate and dissolve sound waves, so as to achieve the purpose of silencing. (It's purely personal speculation, don't take it seriously.) ）

Li Rujin understood that this method was like an army engagement, first using various means to constantly weaken the enemy, and at the last moment, using strong troops, taking the initiative to attack and directly destroy the enemy. One of the most critical is the word initiative.

Moreover, the vibration frequency of the wire is high, which cannot cause the resonance of other substances, at most, it emits some heat when it vibrates, which is negligible compared to this technology.

This technology is still immature and still in the initial stage of development, Li Rujin made up his mind that this technology must be developed in depth, even if it requires a huge amount of investment, manpower and material resources.

If you can really develop mature technologies and products, it will not be a little bit to improve the strength of Emperor Dawen, think about it, if this set of technology is installed on the armored vehicles of the Dawen Empire, the noise of the armored troops will be greatly reduced, thereby reducing the chance of being discovered.

Especially when this technology is applied to submarines, as long as the submarine noise can be reduced to less than 90 decibels, which is similar to the ocean noise, then the submarine of the Dawen Empire will become a black hole in the ocean, and there is a great chance of escaping from the enemy's surveillance, becoming a ghost under the sea, and grasping the initiative on the battlefield.

Li Rujin held a meeting with the R&D team and affirmed the work of the R&D team, especially the main person in charge and relevant participants in the research and development of the two technologies of mortise structure and active silencing technology were praised by Li Rujin.

At the same time, he will apply to the Imperial Cabinet and the War Ministry for a commendation for their outstanding contributions, which, of course, will be done internally. to prevent relevant information from leaking. It will also apply for special funds to invest in the follow-up research and development of these two technologies.

Finally, Li Rujin asked everyone to pay attention to and strengthen the sense of confidentiality, because these two technologies are extremely sensitive, but the technical content is not high, and the tenon structure may be somewhat difficult, but the active silocence technology is an inspiration to put it bluntly, turning the passive into the active, without any technical difficulty, and it is easier to leak, so the secrecy of the active silocation technology is more difficult.

After the meeting, it was not early, Li Rujin had to go to the cabinet to order before going home, after all, he was now in the cabinet, and by the way, he asked the elder for a leave, during this time, he had to soak in the research institute and follow up on these two projects comprehensively.

Li Rujin asked for leave, how could the Great Elder approve it, he finally pulled Li Rujin to the cabinet, how could he let Li Rujin run away again, so Li Rujin did not ask for this leave, but the Great Elder agreed that Li Rujin would be in the cabinet every morning and go to the research institute in the afternoon.