年間 6 号発行
ISSN 印刷: 1948-2590
ISSN オンライン: 1948-2604
APPROACH TO THE SOLUTION OF THE INVERSE PROBLEMS OF TURBO-MACHINE ACOUSTICS
要約
A method for analysis of sound fields generated by turbomachinery is presented. This method is based on the presentation of pressure as a sum of simple acoustic modes. The method allows us to determine the participation of each mode to the overall sound field by means of pressure measurement on the stationary microphone grid. Unsteady linearized Euler equations are used to link the modal amplitude and the pressure measured by the microphones. These Euler equations are solved by the time-marching method. Analysis of the proposed method is carried out. Developed in this work are the ideas of several foreign authors about the turbo-machine sound mode structure. The technique allowing the definition of relative contributions of single modes to the total acoustic field is worked out on the basis of these ideas. Some mathematical features of this technique are investigated in this work.