基于声子晶体理论的舰船液压管路支承用隔振器轴向振动带隙特性研究

利用声子晶体理论,将隔振器设计成由金属和橡胶组成的一维周期性结构,利用其带隙特性实现舰船液压管路的振动控制。采用传递矩阵法和有限元法,对隔振器能带结构和频响函数进行仿真计算,分析材料属性、晶格常数和径长比等因素对带隙频率范围和宽度的影响,根据舰船液压管路振动频率范围,最终确定了隔振器结构尺寸及材料,并对其轴向振动传输特性和减振性能进行了数值仿真和试验验证。试验结果表明,该新型隔振器在600~10 000 Hz以内的频率范围内具有良好的轴向减振性能,能够有效地抑制管路振动向船体结构传播。本研究为舰船液压管路的振动控制提供了一条新的技术途径。

Research on the Longitudinal Vibration Band Gaps of Isolator Applied to Ship Hydraulic Pipe-Support Based on the Theory of Phononic Crystals

Using the idea of phononic crystals, the ship hydraulic pipeline isolator is designed to be a one-dimensional periodic structure which is composed of metal and rubber. The vibration of ship hydraulic pipeline can be controlled by the band gaps properties of the isolator. The band structure and FRF of the isolator is calculated by the transfer matrix method and finite element method, respectively. The influence of material properties, lattice constant and fineness ratio to the frequency ranges and the width of the band gaps is also be considered, and the best structure parameters are obtained. By combing the numerically calculations and experimental measurements, the results indicate that the isolator has longitudinal vibration band gaps at low frequencies form 600 Hz to 10 000 Hz, and the isolator could control the vibration of ship hydraulic system transferring form pipeline to ship hull structures effectively. The research provides a new technical way for vibration control of ship hydraulic pipeline.