Laminated composite plates are utilized due to their high strength/weight ratios. Since such structures are light and have less stiffness, their natural frequencies are lower than usual isotropic structures. Therefore, their behaviours in higher order modes are of interest. On the contrary, sensitivity analysis of vibrating structures is generally performed for lower order modes. In this study, sensitivity analysis of symmetrical/anti-symmetrical/asymmetrical laminated composite plates is performed in low to high order modes. In this regard, angular orientation, Young’s modulus, shear modulus, Poisson’s ratio and density of the plate are selected as design parameters whereas natural frequencies are selected as design objective functions. Discrete singular convolution method is used as solver due to its high computational capability. Although some other conclusions are drawn, it can mainly be concluded that, the natural frequencies are very sensitive to small differences in Poisson ratio for orientation angles of considered plates.

层压复合板因其高强度/重量比而被使用。由于此类结构重量轻且刚度较小，因此其固有频率低于通常的各向同性结构。因此，它们在高阶模式中的行为很有趣。相反，振动结构的灵敏度分析通常针对低阶模式进行。在这项研究中，对称/反对称/不对称层压复合板的灵敏度分析是在低阶到高阶模式下进行的。在这方面，选择板的角取向、杨氏模量、剪切模量、泊松比和密度作为设计参数，而选择自然频率作为设计目标函数。由于其高计算能力，离散奇异卷积方法被用作求解器。