Method of Calculating Optimum Angular Blade Pitches in Fan with Unequally Pitched Blades
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概要
- 論文の詳細を見る
We devised a method of calculating the optimum angular pitches for blades in a high-speed fan that has unequal angular pitches, in order to reduce the level of a tonal annoying noise in such a fan. We used the influence coefficient-and least-squares methods in iterative calculations in which the harmonic spectrum associated with the angular blade pitches was made to converge to a target harmonic spectrum. Our new method of calculation makes it possible to determine the optimum angular blade pitches and target harmonic spectrum necessary for the production of a quiet fan.
- 一般社団法人日本機械学会の論文
- 1983-03-00
著者
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Fujisawa Fumio
Mechanical Engineering Research Laboratory Hitachi Ltd.
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Segawa Yorihide
Mechanical Engineering Research Laboratory Hitachi Ltd.
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SHIOHATA Kooki
Mechanical Engineering Research Laboratory, Hitachi, Ltd.
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- Analysis of the Destabilizing Effect of a Rigid Wall on the Elastic One-Dimensional Flat Plate Placed in Irrotational Flows Adjoining the Rigid Wall
- Method of Calculating Optimum Angular Blade Pitches in Fan with Unequally Pitched Blades
- Balancing for a Flexible Rotor Considering the Vibration Mode : 2nd Report, Balancing in which Modal Influence Coefficients Contain Phase Angle Errors