| 摘要 |
FIELD: measuring technology, measurement of speed of linear displacement of objects over specified trajectory. SUBSTANCE: procedure measuring speed of linear displacement of objects is based on use of position pickups placed along trajectory of movement, on preliminary formation and storage of reference function as ratio of dependencies of output voltages of two adjacent position pickups on coordinate of location of object, on measurement of present values of voltages of these pickups in process of movement of object, on determination of present function of relation of these voltages, on comparison of values of reference and present functions, on determination and storage of time moments ti of equality of values of present function to specified values of reference function, on determination of values of coordinate Xi of location of object by reference function, on their assignment as recording points Deltati = ti-ti-1 corresponding to above-mentioned moments, on computation of time moments Deltati = ti-ti-1 of passage by object of distance Deltaxi between two adjacent recording points Xi-1 and Xi and on determination of values of average speed across trajectory interval Deltaxi by formula where Deltaxi = Xi-Xi-1 and Deltati are correspondingly trajectory interval and time interval between recording moments t1 and ti-1; i=1,2,...,N-1; N being number of recording points. While setting recording coordinates Xi with spacing Deltax trajectory interval Deltax1 between first and second recording moments corresponding to coordinates X2 and X1 of location of object is found by formula and trajectory intervals Deltaxi between following recording moments are determined by formula i= 2, ...,N-1 where sigmaý1 is mean square deviation of methodical error across first trajectory interval between adjacent recording points of object; i=2,3,..., N-1 is law of change of relation of mean square deviations of methodical error sigmaýi+1 across (i+1)-ý and sigmaýi across i-th trajectory interval between two adjacent recording points of object; sigmax is mean square deviation of instrumental error of giving recording coordinates of object; sigmat is mean square deviation of instrumental measurement error of time interval Deltat; Deltati-1 is time of passage by object across trajectory interval Deltaxi-1 between two adjacent recording points that comes before trajectory interval Deltaxi, across which present value of speed Vi. is measured. EFFECT: increased accuracy of measurement of speed thanks to formation of conditions resulting in minimization of sum of methodical and instrumental components of error of measurement of speed. 3 dwg
|
