The method for specifying the values of gas turbine shaft tolerances accounting for the affection of shaft inaccuracies on rotor operational deflection


Аuthors

Usmanov A. R.

Joint-Stock Company "Scientific Research Center StaDiO", 125124, Moscow, ul. 3-ya Yamskogo Polya, 18 (BC "Golden Age"), 8th floor, office 810

e-mail: ysman2d@gmail.com

Abstract

In this work the method for specifying tolerance values of gas turbine shafts based on the mathematical modelling of their operational deflection was proposed. This work includes the results from the previous researches where the importance of accounting for manufacturing inaccuracies of shafts in calculations of their dynamics was demonstrated. For instance, in the one of the works the expressions for centrifugal loads caused by thickness variation, radial runout of outside surfaces and landing surfaces were obtained and in the test task it was showed that this load may significantly affect the shaft dynamics. In the other work the effect of dual stiffness was considered, the expression of the centrifugal load accounting for this effect was obtained and it was showed that dual stiffness may significantly affect the shaft operational deflection in the case of shafts of specific shape.  In the present work the mathematical modelling was carried out by solving of the dynamic solid mechanics equations in rotational reference frame in finite element approximation. The centrifugal loads caused by shaft manufacturing errors were applied as input loads. The finite element model of the part of the considered engine was constructed. This part included the considered shaft. The operational deflection of the shaft in the case of the lower tolerance grade was obtained. The results gave a good comparison with the calculation in beam approximation. Then the operational deflection was obtained for all the other tolerance grades. It was showed, that the clearance between the shaft and other parts of the engine is positive in the case of manufacturing of the shaft by the tenth tolerance grade and the higher ones. 

Keywords:

rotor dynamics, tolerance, unbalance, shaft deflection, centrifugal load

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