On the Relation between the Resistance received by Two Rods and Their Relative Positions when They are set Vertically in the Air Current

[摘要] Hitberto it has been considered that in the design of the tower of electric transmission line the wind pressure must be taken as 15 times larger than that received by the loade _??_ area of one side of the tower. But this is by no means determined on the definite experimental as well as theoretical grounds. The present writer previously published a paper entitled as “About the wind pressure of tower” in the Journal of Aeronautical Research Institute, No.119. 1934, in which is discussed that such a value of wind pressure coefficient is too small and must be taken as 1.8_??_m;2.0. The present paper is written as the result of some experiments made for this purpose. Two rods, whose cross sections are such as circular, rectangular, etc. were placed in the wind channel and the wind pressure received by them and the manner of their vibrations were observed, changing their relative positions. And moveover, to make stream lines and the growth and decay of vortices occurred in these cases in the air current around these objects to be clearly visible the experiments were photographically made using the smoke in the current.The result of these experiments tells us that the falling down of tower sometimes experienced takes place on account of the strong wind pressure acted upon it and adding to it the resouance effect occurred in forced oseillations caused by the wind

[学科分类] 大气科学