巻号一覧
1995 巻 (1995)
- 65 号 p. 1-
- 64 号 p. 1-
- 63 号 p. 3-
- 62 号 p. 3-
前身誌
1995 巻, 62 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
-
第1報準定常論による飛翔解析とフラッター実験Taketo MIZOTA, Hiroyuki KUBA, Atsushi OKAJIMA1995 年 1995 巻 62 号 p. 3-13
発行日: 1995/01/31
公開日: 2010/09/28
ジャーナル フリーErratic behaviour of knuckleball is studied by quasi- steady aerodynamic theory. On TV, We observed ball trajectory, spin rate and its axes of knuckleball pitched by Tim Wakefield who belongs to Pittsburg Pirates of national league. The dependence of Reynolds number for aerodynamic forces of drag, lift and side force are measured with change of seam position by wind tunnel testing. Three dimensional equations for the force equilibrium are shown and solved under quasi-steady approximation of aerodynamic forces acting on the ball. Various types of knuckleball trajectory which were commented by major league batters with fuzzy expressions are shown on the computer screen. Flutter experiments were conducted using wind tunnel. Oscillation amplitude of knuckleball by flutter analysis corresponded well with the results of flutter experiment. We conclude that the erratic behaviour of knuckleball is a flutter phenomenon such as unstable one of bluff body immersed in a fluid flow.抄録全体を表示PDF形式でダウンロード (2056K) -
第2報硬式野球ボールのWake Fieldと空気力溝田 武人, 久羽 浩幸, 岡島 厚1995 年 1995 巻 62 号 p. 15-21
発行日: 1995/01/31
公開日: 2010/09/28
ジャーナル フリーVelocity defects of wake field and boundary layer on a baseball surface are measured with hot-wire anemometer . The transition from laminar boundary layer to turbulent one with change of seam position are also observed. Separation point or line on the surface are largely influenced by these features of the boundary layer and the seam position itself. As the results, the changes of re-circulating zone well correspond to the changes of drag and side forces.抄録全体を表示PDF形式でダウンロード (1515K) -
その1.平均風圧に及ぼす気流勾配および乱れ強さの影饗本郷 剛, 鈴木 雅靖, 土谷 学1995 年 1995 巻 62 号 p. 23-33
発行日: 1995/01/31
公開日: 2010/09/28
ジャーナル フリーPDF形式でダウンロード (2820K) -
沿岸部(新潟市)及び内陸部(新津市)の市街地におげる鉛直プロファイルの測定結果高倉 秀一, 赤林 伸一, 須山 喜美1995 年 1995 巻 62 号 p. 35-44
発行日: 1995/01/31
公開日: 2010/09/28
ジャーナル フリーThe properties of the surface boundary layer play a key role as an input condition in wind tunnel tests, numerical simulation etc., used in the prediction of the strong winds generated around high rise buildings, wind load design of super-high-rise buildings and the prediction of the diffusion conditions of pollutants in urban areas. With the aims of accumulating the basic data for use in such wind tunnel tests/numerical simulations, field observations were made on the vertical profile of the mean wind speed and turbulence intensity in inshore (Niigata city) and inland (Niitsu city) urban areas usign doppler sodar type anemometers. Investigations were also conducted on frequency distribution of the power index in the vertical profile of mean wind speed and power index relationship, as well as the relationship of the power indexes to outside temperature and solar radiations.抄録全体を表示PDF形式でダウンロード (2736K)
- |<
- <
- 1
- >
- >|