Research On Strength And Vibration Of Composite Propellers

Composite is used in many aeroengines in the world, China is also engaged in developing composite propellers. Strength and vibration analysis of composite propellers is urgent and valuable in engineering. This dissertation contrasts the classical laminated plate theory and ANSYS calculation method. It indicates that the results of two methods are close to each other. So the validity of ANSYS is proved. In this dissertation, FEM model of a propeller is built by using ANSYS, and, many work is done about the strength and vibration calculation of the propeller in different operation states. The results indicate that, the strength of the propeller is enough; The max stress point is on the carbon-girder, carbon-girder is the most important supporting component. Comparing the results in four operation states, in the tableland take-off state, stress in propeller is the most; in the cruise state, stress in propeller is the least. As a result, the deformation of the propeller is elastic in all kinds of operation states. Vibration characteristic of the propeller such as modes and frequencies is analyzed by using ANSYS, The results demonstrate the static and rotational vibration frequencies of the propeller are not equal to the forcing frequency caused by engine rotation, so resonance will not happen in the propeller.