Numerical and experimental investigation on free and forced vibration of honeycomb core sandwich structure using the equivalent two-dimensional (2D) model is presented. Initially, a three-dimensional (3D) honeycomb core sandwich structure is converted to a 2D panel with equivalent properties obtained based on the honeycomb plate theory. Following this, the 2D panel is modelled using a layered structural shell element to obtain the vibration response using commercial element software. An experiment on harmonic analysis is carried out on the honeycomb core sandwich structure. The results obtained based on numerical results of free- and forced-vibration responses match well with experimental results. Further, from the forced-vibration response of both experimental and numerical results, it is noticed that the second mode is not observed. This can be attributed to the excitation location corresponding to the nodal point of the second mode and this is verified with the mode shape obtained based on numerical and experimental analysis.

利用等效二维（2D）模型，对蜂窝芯夹层结构的自由振动和强迫振动进行了数值和实验研究。最初，将三维（3D）蜂窝芯夹心结构转换为具有基于蜂窝板理论获得的等效属性的2D面板。然后，使用分层的结构壳体元素对2D面板进行建模，以使用商业元素软件获得振动响应。对蜂窝芯夹层结构进行了谐波分析实验。基于自由振动和强迫振动响应的数值结果获得的结果与实验结果非常吻合。此外，从实验和数值结果的强制振动响应，注意到没有观察到第二模式。