Study On The Vibration Response Of The Wall Caused By Combustion Noise

Combustion noise is an important direction in the research of structural vibration and noise controlling of the engine combustion chamber. In this paper, taking a certain type of the industrial engine test equipment as the research object, the relevant content of the structural wall vibration which results from combustion noise was studied deeply.Firstly, the ANSYS software was used to build the finite element model of a certain type of industrial engine, then the influence of chamber and welded joint on the modeling process was researched according to the actual manufacture of structure; Secondly, in order to study the dynamic characteristics of the structure and the noise, the modal analysis for the finite element and experiment was done, then through hammer test, the reliability of a finite element modal results was certificated; Thirdly, the noise characteristics of the two-dimensional model for the whole test device were calculated by using FLUENT software; Finally, the analysis of the transient acoustic field characteristics of the finite element model for was studied, and the structural vibration characteristics under external load were studied using ANSYS software, then the transient acoustic field of the structure surface was researched using boundary element method in the SYSNOISE software.In this paper, the influence of the chamfer and welded joint on the acoustics and vibration characteristics was obtained by using the method of combining finite element with boundary element. Though the calculation and analysis of different models, it has been found that the transient acoustic field characteristics change with the changes in the structure, which is consistent with the variation rules of combustion noise.