... (90 ° ,90 °,0°,0°)1B (0°,0° ,90 ° ,90 °)1F (0°,0° ,90 ° ,90 °)1B (0° ,90 ° ,90 °,0°)1F (0° ,90 ° ,90 °,0°)1B (90 °,0°,0° ,90 °)1F (90 °,0°,0° ,90 °)1B (0° ,90 °,0° ,90 °)1F (0° ,90 °,0° ,90 °)1B (90 °,0° ,90 °,0°)1F (90 °,0° ,90 °,0°) ... Research, Vol. 9, page numbers (58–62) Gupta, K. & Singh, S.E. ( 199 6). Dynamics of composite rotors, Proceedings of indo-us symposium on emerging trends in vibration and noise engineering, ... or Method Ωcr1 (rpm) Zinberg & Symonds, 197 0 Dos Reis et al., 198 7 Kim & Bert, 199 3 Bert, 199 2 Bert & Kim, 199 5a Singh & Gupta, 199 6 Chang et al., 2004a...