Tunable Underwater Acoustic Stealth Capability of Mechanically Reconfigurable Negative Stiffness Meta-structures

GONG Xiaokun; LI Qing; YANG Deqing; WANG Yingguang

doi:10.11993/j.issn.2096-3920.2026-0024

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GONG Xiaokun, LI Qing, YANG Deqing, WANG Yingguang. Tunable Underwater Acoustic Stealth Capability of Mechanically Reconfigurable Negative Stiffness Meta-structures[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0024

Citation:

GONG Xiaokun, LI Qing, YANG Deqing, WANG Yingguang. Tunable Underwater Acoustic Stealth Capability of Mechanically Reconfigurable Negative Stiffness Meta-structures[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0024

Citation:

GONG Xiaokun, LI Qing, YANG Deqing, WANG Yingguang. Tunable Underwater Acoustic Stealth Capability of Mechanically Reconfigurable Negative Stiffness Meta-structures[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0024

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Tunable Underwater Acoustic Stealth Capability of Mechanically Reconfigurable Negative Stiffness Meta-structures

doi: 10.11993/j.issn.2096-3920.2026-0024

GONG Xiaokun^{1, 2
,},
LI Qing^{1, 2, 3
,
,},
YANG Deqing^{1, 2
,},
WANG Yingguang^{1, 2
,}

1.
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2.
School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3.
Shanghai Jiao Tong University Chongqing Research Institute, Chongqing 401135, China

Received Date: 2026-01-20
Accepted Date: 2026-03-13
Rev Recd Date: 2026-03-10

Available Online: 2026-03-30

Abstract

Abstract

This study addresses the urgent need for vibration control and acoustic stealth in underwater equipment by exploring mechanically reconfigurable negative stiffness metamaterials (NSM) for tunable acoustic performance. In this paper, we optimally designed two NSM unit cells exhibiting distinct bandgaps upon mechanical deformation, systematically analyzed their bandgap characteristics during deformation, and constructed homogeneous/gradient sandwich panel negative stiffness meta-structure. Using vibro-acoustic coupling finite element method, their underwater sound radiation characteristics under different assembly sequences and loading conditions were analyzed. Results demonstrate that the mechanical reconfigurability of NSMs enables flexible tuning of wave propagation performance in meta-structures, while gradient sequences can broaden frequency ranges of high sound insulation. This study provides theoretical and design references for developing lightweight functional structures for underwater acoustic stealth and camouflage.
- negative stiffness metamaterial,
- mechanically reconfigurable,
- band structure,
- bandgap property,
- acoustic stealth

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References(13)

References

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