AERODYNAMIC NOISE SUPPRESSING STRUCTURE OF CURRENT COLLECTOR, LIFT ADJUSTER OF CURRENT COLLECTOR, AND KARMAN VORTEX REDUCING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an aerodynamic noise suppressing structure of a current collector, a lift adjuster of the current collector, and a Karman vortex reducing structure, which lessen the strength of a Karman vortex to reduce aerodynamic sounds from a collector shoe, using a readily attachable and simple structure, and easily adjust a lift acting on the collector shoe.;SOLUTION: When a collector shoe 7 moves in an A₁ direction, ribbons 9a and 9b of a disturbance giving portion 9 are exposed to an airflow F₁, thus they flutter in the airflow F₁. As a result, a separation shearing layer on a lower side, from which a Karman vortex F₁₁ is generated, interferes with the ribbons 9a. This consequently prevents the growth of the Karman vortex F₁₁ generated from the separation shearing layer on the lower side to lessen the strength of the Karman vortex F₁₁, thereby aerodynamic sounds are suppressed. At the same time, the Karman vortex F₁₁ generated in a wake of the collector shoe 7 interferes with the ribbons 9b to collapse the Karman vortex F₁₁. This reduces the strength of the Karman vortex F₁₁ generated from the separation shearing layer on the lower side, thereby the aerodynamic sounds are suppressed.;COPYRIGHT: (C)2013,JPO&INPIT