Ra J.S.,K L University |
Ra J.S.,ALTAIR Engineering Inc. |
Rangarajan N.,ALTAIR Engineering Inc. |
Ratnakar R.,General Motors |
And 3 more authors.
Proceedings of the ASME Turbo Expo | Year: 2012
This paper is concerned with life estimation of a compressor rotor blade of an engine at the Air Force Institute of Technology in Warsaw used in a trainer aircraft. A bird strike is simulated by two or three blade passage blocks in the incoming flow and the pressure field is obtained from a CFD code. For the blade the Campbell diagram is prepared and the critical speeds are identified. The alternating pressures corresponding to the critical speed are obtained from an FFT. A nonlinear damping model is estimated using Lazan's hysteresis law; the equivalent viscous damping model is determined as a function of reference strain amplitude in the given mode of vibration at the rotational speed. An iterative solution is developed with the nonlinear damping model and the resonant stress and location is determined. The life at this critical speed is determined using a cumulative damage criterion. Copyright © 2012 by ASME.
Shupikov A.N.,Ukrainian Academy of Sciences |
Shupikov A.N.,Podgorny Institute for Mechanical Engineering Problems |
Ugrimov S.V.,Ukrainian Academy of Sciences |
Ugrimov S.V.,Podgorny Institute for Mechanical Engineering Problems |
And 11 more authors.
Journal of Aircraft | Year: 2013
This paper deals with making a bird dummy for testing the bird-strike resistance of aircraft components. A new bird dummy has been offered. It differs from existing analogs by reproducing the impact impulse with high accuracy. Besides, it is easy to make, store, and clean up its fragments after tests. The bird dummy is made of silicon that models the bird's muscular tissue. It also has plastic ball fillers for modeling the skeleton and the cavities inside the bird. The results of comparative experimental research in strain occurring in a steel target plate and the elements of aircraft transparencies, as well as the damages of an aircraft vertical stabilizer during impact with the dummy and a real bird, are given. Data are presented for different impact angles and velocities. Comparative experiments have shown that using the dummy offered for testing the bird-strike resistance of aircraft components is a viable option. © 2012 by Ernesto Benini.
Shul'zhenko N.G.,Podgorny Institute for Mechanical Engineering Problems |
Zaitsev B.F.,Podgorny Institute for Mechanical Engineering Problems |
Vikman N.E.,Podgorny Institute for Mechanical Engineering Problems |
Asaenok A.V.,Podgorny Institute for Mechanical Engineering Problems
Strength of Materials | Year: 2012
A procedure for analyzing vibrations in cracked body using three-dimensional model is presented. The process of "breathing" is described by conditions of contact between the crack faces. Some example calculations are provided. © 2012 Springer Science+Business Media New York.