Theoretical and experimental investigation on measurement error of pivot point excursion of flexible joint
In order to quantitatively analyze the measuring error source of pivot point excursion for flexible joint,the pivot point excursion at different vector angles under 10 MPa vessel pressure was calculated using ANSYS software.According to the experimental results of flexible joint,the influences of pendulum rod deformation,horizontal displacement sensor push rod measurement error,push rod measurement error and horizontal deviation of vertical displacement sensor on the measurement results of pivot point excursion were studied respectively.In addition,the influence of the structural error of flexible joint was studied by simulations.Results showed that the measured pivot point excursion was in good agreement with the simulation after correcting four kinds of errors.The error sources in the measurement of pivot point excursion were confirmed,in which the push rod measurement errors of horizontal and vertical displacement sensors accounted for 65.98％of the cylindrical envelope height error,and 77.32％of the cylindrical envelope radius error,respectively.And these led to a great influence on the axial and radial drifts of flexible joint.Moreover,the structural error of flexible joint also affected the measurement of pivot point excursion.The distribution of pivot point excursion caused by the thickness error of elastomers and reinforcements was consistent.The results can provide a theoretical guidance for the error analysis of pivot point excursion measurement of flexible joint.
pivot point excursionflexible jointerror analysisfinite element analysissolid rocket motor
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