Foreign media: A research team in Shanghai has developed a vibration reduction technology, which is expected to significantly improve the stealth performance of submarines during covert operations.
According to peer-reviewed research published in the "Journal of Noise and Vibration Control," this innovation has the potential to reduce the detection range of enemy sonar systems by more than half. This technology adopts a hybrid active-passive vibration reduction system, replacing traditional rigid engine mounts, which can reduce engine noise transmitted through the submarine hull by up to 26 decibels.
In particular, the system combines steel-rubber-steel "sandwich" rings to dissipate vibrations and arranges 12 piezoelectric actuators around the engine to further reduce noise. These electric actuators neutralize the engine's micrometer-level motion with powerful control force through precise lever mechanisms.
The study points out that reducing noise by only 10 decibels can reduce the detectable range of underwater vehicles by 32%. At low speeds, mechanical noise generated by power equipment is the main noise source for underwater vehicles, usually manifested as low-frequency tones, which are an important part of their acoustic characteristics.
Source: https://www.toutiao.com/article/1833251143564423/
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