| 摘要 |
PURPOSE:To eliminate a strain component due to an unbalanced load by converting strain data that two strain gauges output from a rotary to a stationary coordinate system, and then passing the results through low-pass filters. CONSTITUTION:Strain gauges 11 and 11 stuck at two 90 deg. out-of-phase positions of the external circumference of a rotating shaft 14 detect strain signals epsilona and epsilonb of a rotary coordinate system. Then, rotated pulse signals sin omegat and cos omegat obtained by a sine converter 6 and a measured strain signal are inputted to a multiplier 7 and an adding amplifier 8 for arithmetic, thereby finding the x-directional and y-directional component of strain. Said component values are both passed through low-pass filters 9, 9 to obtain a strain signal proportional to fluid pressure as absolute coordinate display. |
