电静液作动器（Electro-hydrostatic actuator, EHA）液压系统中，液压管路在泵源激励下易产生弯曲振动，从而影响系统的稳定性和可靠性。本文针对EHA系统在变转速工况下的250-550Hz中频宽带减振需求，提出基于声子晶体结构的管路减振设计与带隙调控方法。采用传递矩阵法分析了布拉格型与局域共振型声子晶体管路的能带结构，揭示了几何和材料参数对带隙位置和宽度的影响机理。利用带隙耦合现象设计了耦合声子晶体管路，并通过参数优化获得了225-585Hz的完整耦合带隙，有效拓宽了带宽，解决了单一声子晶体结构下难以实现目标频段的完整覆盖问题。最后采用有限元仿真验证了所设计的管路在目标频段内的减振效果，平均振动传递损失达50.24dB。

In electro-hydrostatic actuator (EHA) hydraulic systems, hydraulic pipelines are prone to flexural vibration under pump-induced excitation, which can compromise system stability and reliability. Addressing the mid-frequency broadband vibration reduction requirement in the 250-550 Hz range for EHA systems operating with variable motor speed, this paper presents a pipeline vibration reduction design and bandgap tuning method based on phononic crystal structures. The transfer matrix method is employed to analyze the band structures of Bragg-type and locally resonant-type phononic crystal pipelines, revealing the effects of geometric and material parameters on bandgap position and width. By utilizing the bandgap coupling phenomenon, a coupled phononic crystal pipeline is designed, and parameter optimization achieves a continuous coupled bandgap of 225-585 Hz, effectively broadening the bandwidth and covering the target frequency range that is difficult to achieve with a single phononic crystal structure. Finite element simulations further verify the vibration attenuation performance within the target frequency range, demonstrating an average vibration transmission loss of 50.24 dB.