VIBRATION AND OPTIMUM DESIGN OF ROTATING LAMINATED BLADES

The vibration and optimum design of a rotating laminated blade subject to constraints on the dynamic behavior are investigated. Restrictions on multiple natural frequencies as well as the maximum dynamic deflec tions of rotating laminated blades are considered as constraints on th e dynamic behavior of the system. Aerodynamic forces acting on the bla de are simulated as harmonic excitations. The optimality criterion met hod and the modified method of feasible directions have been successfu lly developed for optimizing the weight of the rotating laminated blad e. Effects of radius of the disk, aspect ratio, and rotating speed on the system dynamic behaviors and/or the optimum design are also studie d. The vibration analysis shows that most of the bending modes can be significantly affected by the rotating speed and the radius of the dis k. Results also show that the optimum weight with constraints on the d ynamic response is higher than that with frequency constraints. Moreov er, results show that the weight of the rotating laminated blade can b e greatly reduced at the optimum design stage. Copyright (C) 1996 Else vier Science Limited