Abstract
The present paper deals with the investigation of dynamic responses of a rotating pre-deformed blade in four cases of resonance, including two subharmonic resonances and two combination resonances. The dimensionless gas excitation amplitude is assumed to share the same order with the dimensionless vibration displacement. Four cases of resonance are confirmed by examining the secular terms. The theoretical analysis framework is established for each resonance case based on the method of multiple scales. The original dynamic system is integrated numerically by the Runge–Kutta method. The frequency components and phases obtained from fast Fourier transform of the numerical response are used to verify the theoretical results. For the purpose of contrast, modulation equations are also integrated numerically. In all four resonance cases, the theoretical results agree well with the numerical simulation. Parameter studies are conducted to clarify the effects of system parameters on the perturbation curves. Various results are obtained for the rotating blade. A quasi-saturation phenomenon occurs in both combination resonances of summed type and difference type, and the corresponding limit value of the second-mode response can be reduced by decreasing the external detuning parameter. The quasi-saturation phenomenon of rotating blade only appears with high gas pressure. The subharmonic resonance of second mode and the combination resonance of summed type are hard to excite in practice compared with the other two cases.
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Acknowledgements
This project is supported by the National Natural Science Foundation of China (Grant Nos. 11702033 and 11872159), the Fundamental Research Funds for the Central Universities, CHD (Grant Nos. 300102120106, 300102128107), and the Innovation Program of Shanghai Municipal Education Commission (No. 2017-01-07-00-09-E00019).
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Zhang, B., Ding, H. & Chen, LQ. Subharmonic and Combination Resonance of Rotating Pre-deformed Blades Subjected to High Gas Pressure. Acta Mech. Solida Sin. 33, 635–649 (2020). https://doi.org/10.1007/s10338-020-00168-x
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DOI: https://doi.org/10.1007/s10338-020-00168-x