@article{oai:muroran-it.repo.nii.ac.jp:00010026, author = {松本, 大樹 and MATSUMOTO, Hiroki and 五十嵐, 聡 and IGARASHI, Sou and 海野, 正樹 and UMINO, Masaki}, issue = {873}, journal = {日本機械学会論文集, Transactions of the JSME}, month = {}, note = {application/pdf, The aerodynamic noise generated from a perforated metal plate varied by air-flow direction. In the case of expansion type perforated metal plate, it generates very large level aerodynamic noise with a prominent peak in the frequency characteristic. In this paper, velocity fluctuation at some measuring points is measured by a hotwire anemometer to examine its cause. In the experiment, coherent output power (COP) of velocity fluctuation is calculated. The coherence function is defined by the relations between the generated noise and velocity fluctuation of air flow behind perforated metal plate. The expansion type perforated metal plate generates orderly vortex shedding and it brings the vibration of perforated metal plate. The distribution of partial overall value of COP indicates strong correlation with the plate vibration mode. That phenomenon is predicted as lock-in phenomenon between vortex and vibration of the plate.}, title = {パンチングメタル板を通過する気流による騒音増大現象}, volume = {85}, year = {2019}, yomi = {マツモト, ヒロキ} }