Building upon the previous two chapters on the vibration of overall formed conical-cylindrical shells with bolted boundaries, this chapter further investigates the vibration characteristics of conical-cylindrical shells assembled from separate shell segments via bolted-flange connections. By establishing a theoretical model that simultaneously considers the bolt pressure distribution and the contribution of the flange stiffness, combined with experimental verification, the influence law of flange connection on the dynamic behavior of the structure is revealed. The research is based on Donnell shell theory and Euler–Bernoulli beam theory, and separately derives the energy expressions for the conical cylindrical shell section and the flange section. The dynamic equations are established using the Lagrange equation. The accuracy of the model is verified through modal experiments and response tests. Based on this model, the influence of parameters such as bolt loosening, bolt quantity, flange size, and cone angle on the structural frequency and vibration response is systematically analyzed. A comparison is made with the dynamic characteristics of the overall formed conical-cylindrical shell, and the unique role of the flange connection in terms of stiffness, damping, and boundary effects is clarified. The research results provide theoretical and experimental basis for the dynamic design of shell bodies with flange connections, the optimization of bolt configuration, and the assessment of connection status.