Abstract: An integrated bladediscrotor model was established based on a gas turbine rotor system. With the overall and substructure methods， the static frequency was solved. The comparison of two methods shows that the accuracy and efficiency of the substructure method is high. Considering the role of centrifugal stress， dynamic frequency of the integrated bladediscrotor system at working speed was solved with the substructure method. Meanwhile， the influence of the blade on the overall modality was analyzed. Finite element models of the bladedisc system were established under different aspect ratios， and the influence of aspect ratio on bladedisc system model was explored in fixed blade width and fixed blade length， respectively. Results indicate that the study is closer to practical engineering when considering the blade centrifugal stiffening effect on the bladediscrotor system. The aspect ratio has a great influence on the system vibration characteristics. This research provides theoretical basis for the dynamics design of gas turbine rotor.

Key words: integrated bladediscrotor, centrifugal stress, substructure method, modality, aspect ratio