@techreport{oai:jaxa.repo.nii.ac.jp:00043984,
 author = {渡辺, 実 and 鳥崎, 忠雄 and 武田, 克己 and 小林, 紘 and 関根, 静雄 and 中山, 普 and 吉田, 晃 and 越沼, 威 and 松田, 幸雄 and WATANABE, Minoru and TORISAKI, Tadao and TAKEDA, Katsumi and KOBAYASHI, Hiroshi and SEKINE, Shizuo and NAKAYAMA, SUSUMU and YOSHIDA, Akira and KOSHINUMA, Takeshi and MATSUDA, Yukio},
 month = {Jan},
 note = {Inlet and fan exhaust noise suppressors for a high by-pass ratio turbofan engine (FJR710) were ground tested.The inlet and fan exhaust duct walls were lined with perforated-plate-on-honeycomb absorbers.Acoustically treated splitter rings could be inserted into the inlet duct for a greater noise attenuation.The inner and outer walls of the annular fan exhaust duct were lined with different depth absorbers for a broader band noise attenuation.Sound power attenuation spectra were obtained by an insertion loss technique using far field measurements.Noise from each treated duct was compared with noise from a hard wall duct without splitters.A maximum perceived noise level attenuation due to the suppressors of 16 PNdB was obtained at 95％ fan speed.Degradations of engine performance caused by the fully equipped suppressors with splitter rings were about 3％ of the engine thrust.No detectable thrust loss was measured in other experimental cases without splitter rings., 資料番号: NALTM0401000, レポート番号: NAL TM-401},
 title = {ファンエンジンFJR710による吸入消音ダクト及びファン排気消音ダクトの地上実機試験},
 year = {1980}
}