Scaled model and test method for marine gas turbine mount system

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 106-111.

WU Shuangshuang1,2, FENG Linhan2, ZHANG Lei2, YAN Ming1, WANG Teng2

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Abstract

The shock test of key components is a necessary means to evaluate the shock resistance design of marine gas turbine.Aiming at the shock resistance test of a gas turbine mount system,firstly,physical quantities related to the dynamic characteristics of the mount system were selected and the similarity relations were deduced by using the method of similarity theory and equivalent shock.Secondly,the shock test material was determined and the mechanical properties were obtained through the experiment.The load,natural frequency and modal shape were analyzed.Finally,a scaled test model and test method of a gas turbine mount system were proposed,and modal analysis and shock simulation were carried out by finite element model,which verified the equivalence between the scaled test model and the original.The results show that the relative errors of the first and second order natural frequencies of the scaled test model and the original are within 10%,the relative displacement response error is 13.69%,the absolute acceleration response error is 3.18%,and the relative errors are less than 20%,which meet the engineering requirements.The effectiveness of the scaled test model and test method is verified,which provides technical reference for the shock resistance test of the mount system.

Key words

mount system / shock resistance test / similarity theory / equivalent shock / scaled test model

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WU Shuangshuang1,2, FENG Linhan2, ZHANG Lei2, YAN Ming1, WANG Teng2. Scaled model and test method for marine gas turbine mount system[J]. Journal of Vibration and Shock, 2023, 42(9): 106-111

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