A Shanghai-based research team has unveiled vibration damping technology that can significantly enhance the stealth of submarines during covert operations, according to a peer-reviewed study published in the Chinese journal Noise and Vibration Control.
Zhang Zhiyi and his team of researchers from the State Key Laboratory of Mechanical Systems and Vibration at Shanghai Jiaotong University said their innovation could theoretically reduce the detection range of enemy sonar systems by more than half. According to the article, this technology is designed to replace the traditional rigid engine supports with a hybrid active-passive vibration isolation system, which will reduce engine noise transmitted through the hull of the submarine by 26 decibels (dB).
It combines a multilayer ring made of steel, rubber and steel to dissipate vibrations and an active layer with 12 piezoelectric actuators arranged radially around the motor to further reduce noise.
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