关键词: 成组叶片, 动应力, 瞬态动力学分析, 松拉金

Abstract: An algorithm to calculate the dynamical stress of loose lashing wire grouped blade with transient dynamical analysis method is proposed. First, the algorithm calculates the dynamical frequency of loose lashing wire grouped blade by means of the method of transient dynamical analysis combining with maxi-mum entropy spectrum analysis. And then, three groups of harmonic loads, the frequency of them are equal to the first order dynamical frequency, 1 Hz more and 1 Hz less than the first order dynamical frequency, are applied to the blades. After that, the transient dynamical response of blades to the three groups of resonance vibration loads are calculated respectively, and the dynamical stresses are obtained by using the expansion calculation at the peak points of displacement curves. No any simplification and assumption for the connection of loose lashing wire and blades are used in the proposed algorithm. A frictional contact model for loose lashing wire and blades is constructed directly, and the model reflects the actions of loose lashing wire and blades. The calculated result of dynamical stress is reasonable and reliable. The proposed algorithm provides a useful numerical calculating method for the calculation of dynamical stress of loose lashing wire grouped blades.

Key words: Dynamical stresss, Grouped blades, Loose lashing wire, Transient dynamic analysis