. The Bell System technical journal . ted some distance from New York, where the terrainand weather conditions were suitable for such an investigation, andan experimental station was constructed and appropriately equipped. 356 MOTION OF TELEPHONE WIRES IN WIND 2,hl Some time will be required, however, before definite conclusions canbe drawn from the experimental work of this new laboratory. As an aid in the interpretation of the experimental results, certaintheoretical work has been done on the dynamics of a wire loop swingingin the wind. It is this phase of the problem that is dealt with in t
. The Bell System technical journal . ted some distance from New York, where the terrainand weather conditions were suitable for such an investigation, andan experimental station was constructed and appropriately equipped. 356 MOTION OF TELEPHONE WIRES IN WIND 2,hl Some time will be required, however, before definite conclusions canbe drawn from the experimental work of this new laboratory. As an aid in the interpretation of the experimental results, certaintheoretical work has been done on the dynamics of a wire loop swingingin the wind. It is this phase of the problem that is dealt with in thisarticle. In the first part of this discussion, the wire loop is treated as aninelastic, rigid body.^ As it was later found that under the conditionsapplying in our problem there was a considerable increase in the sag ofthe wire due to the wind, an investigation was made of the magnitudeof the correction required when the elasticity of the wire is taken intoaccount, the results of which are given in the latter part of this Fig. 1. Consider an element of the wire, shown in Fig. 1 in cross-section,swinging about axis 0, at a radius y. The wind is assumed horizontaland transverse to the axis. The sag a is also assumed small comparedwith the span length so that to a sufficient approximation the lengthof the wire is equal to the length of the span and the surface of the wireopposing the wind is independent of the angle of deflection {a) of thewire in the wind. The velocity of the element of wire relative to axes fixed with respectto the earth is ya. The wind velocity relative to the same coordinate ^ An article entitled The Behavior of Overhead Transmission Lines in High Winds by Professor E. H. Lamb, which appeared in the October 1928 Journal of the Institu-tion of Electrical Engineers, gives an analysis of the inelastic, rigid loop problem whichhas been followed in general outline in the present treatment. There is disagreement,however, with one of the fundamental assu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
