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FEM Analysis of Factors Influencing the Beat Frequency of Japanese Temple Bells
Nakanishi, Takuji,Ogushi, Hajime,Yarai, Atsushi The Acoustical Society of Korea 2008 韓國音響學會誌 Vol.27 No.e2
The beat frequency is very important for the sound of Buddhist temple bells, but its concrete origins have not yet been fully clarified. In our research, we considered the beat of the bell at Hojobo Temple (Kanagawa Prefecture). Although its beat frequency has already been measured as 1.6 Hz, no satisfactory explanation has been offered for the factor that determines this value. In our previous research, we investigated the "Doza," the point where the bell is struck, and the "Obi," the vertical stripes around the bell, both of which are circumferential asymmetrical factors that can be visually recognized. Our investigations were carried out by using the Finite Element Method. These factors, however, could not sufficiently explain the beat frequency. Here, we first investigate the "Nyu," the many small projections on the bell, and the deviation between the centers of the inner and outer diameters of the bell. These two factors, however, were also found tobe insufficient explanations of the beat frequency. Through subsequent investigation, however, we finally clarified that the beat frequency's origin lies in the local dimension variation in the "Komazume," which is the bottom part of the bell as well as its thickest part.
Development on 31.5MVA STATCOM and Digital Evaluation Tool for Voltage Flicker Compensation
Koichi Hidese,Tomotsugu Ishizuka,Fumio Aoyama,Satoru Ota,Kouji Ogushi 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A large capacity self-commutated static var compensator rated at 31.5MVA has been developed for the voltage flicker compensation. The operation experiences in an actual field and the successful performance of the voltage flicker suppression are introduced in this paper. The principle of the voltage flicker evaluation and the real time digital evaluation tool are also described. This tool can calculate simultaneously the voltage flicker value with and without the STATCOM. It can also analyze the voltage flicker from the are furnaces which will be compensated by the STATCOM