| Citation: | Liu Shen, Ma Yingqun, Zhao Wei, et al. Multi-frequency resonance capture and targeted vibration suppression mechanism in thin-walled casing-nonlinear energy sink[J]. Journal of Aerospace Power, 2026, 41（9）：20250027 doi: 10.13224/j.cnki.jasp.20250027
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A dynamic absorber with nonlinear stiffness characteristics (nonlinear energy sink, NES) was introduced into a three-degree-of-freedom system to study the suppression of multi-frequency vibrations in the main system, and then extended to the real casing structure of an aero-engine with continuous medium characteristics. In terms of theoretical analysis, based on the complex variable averaging method, the intrinsic mechanism and necessary conditions for the nonlinear energy sink to achieve transient resonance capture and targeted energy transfer in a three-degree-of-freedom nonlinear system were revealed, and the dynamic response characteristics of the nonlinear energy sink in a multi-degree-of-freedom system were obtained. In terms of regularity analysis, the influences of different nonlinear stiffness and damping parameters on the energy dissipation characteristics of the nonlinear energy sink in a three-degree-of-freedom nonlinear system were studied, and the optimal vibration dissipation characteristics of the nonlinear energy sink in a multi-degree-of-freedom system were obtained. Based on the vibration energy visualization analysis method, the design method of the nonlinear energy sink was extended to the real engine combined casing structure, and the process of vibration energy transfer from the casing vibration source to the nonlinear energy sink was successfully visualized. From the perspective of vibration energy, the targeted energy absorption and dissipation characteristics of the nonlinear energy sink on the casing structure were revealed. A single nonlinear energy sink effectively suppressed the first three modal vibrations of the casing, reducing the amplitudes by 25.1%, 25.3%, and 25.2%, respectively, achieving broadband vibration suppression of the thin-walled casing structure by the nonlinear energy sink.
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