2026-03-10T05:47:23Z https://jaxa.repo.nii.ac.jp/oai

oai:jaxa.repo.nii.ac.jp:00034598 2023-06-20T23:38:48Z 1887:1890 1896:1898:1899:1901

FUNDAMENTALS OF ACOUSTICAL SILENCERS (III) Attenuation characteristics studied by an electric simulator IGARASHI, Juichi ARAI, Masaaki Attenuation characteristics of the acoustic filters have been studied by an acoustic method [1]. Analytically, they can be obtained by calculating from the equivalent circuits and the method of measurement of the four-terminal constants of the black boxes was reported in Part II [2]. The present paper includes the method of measuring the attenuation characteristics by the electric simulator. Several acoustic elements were simulated by the electric elements and the results obtained agreed well to those by the acoustic method. Without constructing any real models of the silencers we can get the attenuation characteristics by proper selection of the electric elements. Effect of length of the pipe which connects the engine and the muffler was also studied by this method. 資料番号: SA2404827000 東京大学航空研究所 Aeronautical Research Institute, University of Tokyo 1960-02 eng departmental bulletin paper https://jaxa.repo.nii.ac.jp/records/34598 0376-1061 AA00514444 東京大學航空研究所報告 Report/Aeronautical Research Institute, University of Tokyo 26 2 17 31 https://jaxa.repo.nii.ac.jp/record/34598/files/SA2404827.pdf application/pdf 1.1 MB 2020-01-24