本文用 Flügge 壳体理论，分析了径向内压对复合材料机匣的弹性稳定性（屈曲特性）的影响，并讨论了几何参数及材料特性对屈曲特性的影响，结果表明，在强度允许的范围内，径向内压的提高有助于提高机匣的抗屈曲能力。进一步应用振型叠加方法，研究了复合材料机匣在径向内压作用下受到径向简谐激励作用时稳态动力响应问题，结果表明，在特定径向简谐激励的作用下，径向位移响应的最大值在激励面和非激励面对应的频率点不同，激励面内出现在第三阶频率点处，而在非激励面内则出现在基频处。

Influences of the radial internal pressure on the elastic stability (buckling characteristics) of the composite case are analyzed, which based on the Flügge shell theory, in addition, the influences of geometric parameters and material properties on buckling characteristics were also discussed. Results show that the improvement of internal pressure can improve the buckling of casing within the limits of strength. Furthermore, the dynamic responses of the composite case under a radical harmonic force are studied by applying the mode superposition method. It is found that under the radial harmonic excitation, the frequency of the maximum radial displacement is different on the excitation force plane and non-excitation forced plane, more specifically, the maximum radial displacement appears on the third order frequency point of the excitation force plane and on the fundamental frequency of the non-excitation forced plane.