CAJ | 학술논문

采用大型通用软件ANSYS,建立截锥型薄壁结构的实体有限元动力学模型,通过与相关实验数据的对比验证了模型合理性.据此,利用无限元模拟自由声场边界,建立声场-截锥型薄壁结构的直接耦合有限元动力学模型.通过数值仿真分析研究了声场中截锥壳结构的振动特性,并讨论了声振动对结构动力特性的影响.研究结果表明:数值仿真结果和截锥壳声振实验数据比较一致.在考虑声场影响后发现:结构位移共振频率值大多有所降低,结构位移共振频率数量显著增多;在低频下,结构位移响应峰值在声场的影响下明显增大;在高频下则明显减小.
채용대형통용연건ANSYS,건립절추형박벽결구적실체유한원동역학모형,통과여상관실험수거적대비험증료모형합이성.거차,이용무한원모의자유성장변계,건립성장-절추형박벽결구적직접우합유한원동역학모형.통과수치방진분석연구료성장중절추각결구적진동특성,병토론료성진동대결구동력특성적영향.연구결과표명:수치방진결과화절추각성진실험수거비교일치.재고필성장영향후발현:결구위이공진빈솔치대다유소강저,결구위이공진빈솔수량현저증다;재저빈하,결구위이향응봉치재성장적영향하명현증대;재고빈하칙명현감소.
The 3D dynamic model of a truncated conical thin-walled structure is built using the ANSYS finite element software.The predicted results are in good agreement with the experimental data,thus validating the proposed model.The modeling involves solid finite elements for the structure and 3D acoustic elements for the sound field and the infinite elements for the free boundary conditions.The dynamic responses of the acoustic-structure coupling structure are investigated with numerical simulation approach.The effects of acoustic vibration on the structural dynamic characteristics are analyzed.The predicted results are found to be in good agreement with the vibro-acoustic test data.The number of resonant natural frequencies of the structure rises remarkably; their values decrease downward in most cases due to the effects of sound field.The amplitudes of the structural response increase in low frequency band and decrease in high frequency band.