Measurement of Surface Roughness of Volleyball

Abstract

Main investigations are focused to measurements of all forces and moments acting on the rotating volleyball, such as drag FD, lift FL, side force FS, moment of roll MX, pitch MY and yaw MZ. Based on previous first results roughness of surface is an important quantity to study. Description of measurement of surface roughness of volleyball is presented in the article. Devices used in the measurement are noted. Results of the measurement are discussed and meaning of the results for aerodynamic forces acting on volleyball is taken in consideration.

Uncertainty of Temperature Measurement in Working Environment

“…It depends on math model and also on values of covariance. Analogically it is possible to do uncertainty balance also for other type of measurement of other quantities in practice [8][9][10][11][12][13][14][15][16].…”