METHOD OF COMPARATIVE EVALUATION OF SLIDING QUALITY OF SKIS Russian patent published in 2015 - IPC A63C11/00 

FIELD: sport.

SUBSTANCE: object of the invention is the creation of a method of comparative evaluation of the sliding quality of skis with the use of a single-channel spectrum analyser (based on a patent of the Russian Federation No. 2458327 C1) and one voltmeter without any additional equipment. The set task is determined by the fact that the amplitude of acceleration is measured on the harmonic component (2.43-2.5) Hz allocated by the spectrum analyser, and an acceleration sensor is mounted on the hand of an athlete with simultaneous pushing from place with the ski poles. The measurement circuit that implements the proposed method of the comparative evaluation of the sliding quality of skis, consists in the fact that the athlete standing on the skis pushes with the ski poles, and the acceleration sensor mounted on the hand generates a signal of acceleration of this hand, which is fed into the spectrum analyser. In the spectrum analyser using removable RC-chains a band pass filter of (2.43-2.5) hertz is set. The spectrum analyser, placed in a waist bag of the athlete, filters this signal by passing to the outlet only the harmonic with a repetition rate of 2.5 Hz. The voltmeter is connected to the outlet of the spectrum analyser and records the acceleration of the hand on this harmonica - the bigger it is, the better the sliding properties of the skis are with the particular lubrication. The comparison of ski sliding was carried out, with three types of lubrication in the coordinates: the axis X is the frequency (Hz); the axis Y is the ski acceleration m/s², where 1, 2, 3 are various kinds of lubricants.

EFFECT: method enables measuring more accurately the ski sliding.

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