Upgraded Railway Front Searchlight Design Plastic Deformations by its Vibrations with Resonance Frequencies

Abstract

Natural frequencies of the four upgraded front searchlight designs were received in ANSYS software environment. In the first case serial front searchlight incandescent electric lamp was replaced by a LED group which was mounted on the one-piece cylinder backing. The second front searchlight design had the backing which was upgraded by a radial ribs and concentric rigidity ferrules. Analyze of the backing deformation character by vibrations with the natural frequencies established a number of design solutions which make it possible to raise front searchlight vibration resistance. By the front searchlight model were established that the natural frequencies of the searchlight with the one-piece backing appertain to the whole range of the train vibrations. Natural frequencies of the backing with perforation, rigidity ferrules, and radial ribs appertain to the low frequencies of the railway locomotive vibrations spectrum. On basis of devised methodology of analyze of the deformation and natural frequencies of the surface carrying a LED group the vibration-proof searchlight design was introduced and researched.

Parametrization of nonuniform brightness of the light flux of a lighting device operated in vibrating conditions

“…As a result, light-emitting diodes were placed on a solid disc (Fig. 1b) made of aluminum alloy EN (European standard AW-6063) 22 . Each light-emitting diode was equipped with secondary optics 23 in order to reduce angular aperture of the searchlight's light flux.…”

“…-Direction of the light beams is evenly distributed within the borders of the stereo-angle of radiation. In case of the railway headlamp it was proposed to use SMD 3528-W light-emitting diode by CIVILIGHT (Taiwan) 22 with the beam angle of 120°. Equipping these light-emitting diodes with secondary optics [13][14][15][16][17][18]51 enabled us to reduce the beam angle to 9°-10°.…”