Numerical prediction on static and dynamic properties for rotating mirror of ultra-high-speed photography
2007
The methods of numerical analysis for the strength and vibration modals of rotating mirrors were presented based
respectively on the three-dimensional elastic mechanics and dynamics. On strength computation, the finite element
models of rotating mirror were established according to the real structure of mirror, and the rotating three-faced
aluminous and beryllium mirrors were analysed contrastively. Results display that the surface deformation quantity of the
aluminous mirror is approximately 20 times as large as beryllium one, and the maximum stress is 1.6 times against the
latter. Then, the three-faced aluminous mirrors were analyzed at variedly fit between shaft and axle hole. One conclusion
is gotten out that the mirror strength is foreign to fits, but it is weaken by the axle hole obviously. On the modal analysis
of vibration, this method can simulates accurately the natural frequencies and corresponding modalities of mirror. And
the results from three-face aluminous mirror indicate that the resonance points of a new mirror may be guaranteed
existing in selected speed range.
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