New technology helps Chinese submarines move closer to 'silence'

Chinese researchers say they have developed a way to reduce the vibrations of underwater submarines, halving the detection range of sonar (submarine detection equipment).

Illustration of a method to reduce the noise detection range of submarine engines - Photo: Shanghai Jiao Tong University

On May 27, the SCMP reported that Chinese scientists have successfully developed advanced soundproofing technology that significantly reduces noise from submarine engines, which can cut the detection range of enemy sonar systems by more than half.

Accordingly, the research team of Professor Zhang Zhiyi from Shanghai Jiaotong University focused on solving mechanical noise - the main sound source that makes enemy sonar systems detect submarines, with a hybrid active-passive vibration isolation system, replacing traditional rigid engine mounts.

Specifically, this new technology includes a steel-rubber-steel “sandwich” clamp that absorbs vibrations, combined with an active control layer of 12 piezoelectric actuators arranged symmetrically around the motor. These actuators are capable of eliminating vibrations at the microscopic level through precise control mechanisms.

According to the research team, the system can reduce the noise transmitted through the submarine's hull by up to 26 decibels (dB). With a 10dB reduction, the detection range of enemy sonar can be reduced by up to 32%. Therefore, this technology has the potential to reduce the detection range of submarines in practice by more than half.

“The application of vibration reduction measures to limit the energy transmitted from the engine through the support frame is a key factor in improving the acoustic stealth of submarines,” the research team emphasized.

Another notable point in this research is the intelligent FX-LMS (Filtered-X Least Mean Square) algorithm that helps the control system coordinate all 12 actuators simultaneously without causing feedback resonance.

While the experimental results show promise, the researchers admit there are still some technical hurdles to overcome, such as the stiffness of the rubber and the longevity and durability of the piezoelectric materials under long-term operating conditions.

The research, which is reportedly being conducted with the participation of China State Shipbuilding Corporation - one of the country's largest submarine manufacturers - suggests a high likelihood that the technology will soon be put into practical use.

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Source: https://tuoitre.vn/cong-nghe-moi-giup-tau-ngam-trung-quoc-tien-toi-gan-nhu-vo-thanh-20250527125033695.htm