CAJ | 학술논문

针对圆柱壳内动力机械的隔振设计问题，建立了由多向扰动振源、斜置弹性支承、两端剪力薄膜支撑各向同性圆柱壳体基础组成的隔振系统解析形式波动模型，并通过有限元法验证了所建模型的有效性。基于 Goldenvei-zer-Novozhilov 薄壳理论和模态叠加原理，考虑弹性支承的分布参数特性，运用子结构导纳法推导了整体系统的耦合振动传递方程，以功率流为价值函数对系统的耦合振动机理进行了探究。数值仿真表明：隔振器的分布参数特性及与基础模态的耦合交互使得高频域系统功率流下降趋势变缓，影响高频隔振设计可靠性；适度增大隔振器斜置倾角，可使系统的各向刚体模态波峰聚集在较窄的频带范围内，同时降低传递到基础的功率流幅值，收到更好的隔振效果；可通过配置合适的隔振器斜置倾角，获取动力机械独立的横向及横摇振动。
침대원주각내동력궤계적격진설계문제，건립료유다향우동진원、사치탄성지승、량단전력박막지탱각향동성원주각체기출조성적격진계통해석형식파동모형，병통과유한원법험증료소건모형적유효성。기우 Goldenvei-zer-Novozhilov 박각이론화모태첩가원리，고필탄성지승적분포삼수특성，운용자결구도납법추도료정체계통적우합진동전체방정，이공솔류위개치함수대계통적우합진동궤리진행료탐구。수치방진표명：격진기적분포삼수특성급여기출모태적우합교호사득고빈역계통공솔류하강추세변완，영향고빈격진설계가고성；괄도증대격진기사치경각，가사계통적각향강체모태파봉취집재교착적빈대범위내，동시강저전체도기출적공솔류폭치，수도경호적격진효과；가통과배치합괄적격진기사치경각，획취동력궤계독립적횡향급횡요진동。
In order to deal with the vibration problem about a power machinery installed in a cylinder,the multidimensional cou-pled vibration transfer model which consists of complex excitations,inclined elastic isolators,and a circular cylindrical shell foundation is established.Based on the Goldenveizer-Novozhilov thin shell theory and modal superposition principle,the cou-pled vibration transfer equation of the overall system is derived by using the substructure mobility approach.The power flow concept is used to assess vibration transfer characteristics and isolation performances as a cost function.Numerical simulation shows that:with consideration of the distributed parameter characteristic of isolators,the system power spectrum decline slo-wer at higher frequencies resulting in an unreliable design of high-frequency vibration isolation.Interestingly,if increasing the inclined angle of isolators appropriately,one can make each rigid mode of the system gathered in a narrow frequency range. Meanwhile,the power transmitted to the shell is less than the vertical-mounted case,which leads to a better isolation perform-ance.It can obtain independent transverse and pitch oscillation by changing inclined angle of isolators into a specific value.