Theoretical and experimental investigation on measurement error of pivot point excursion of flexible joint
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摘要:
为定量研究柔性接头摆心漂移测量的误差来源,利用ANSYS计算了接头在容压10 MPa、不同摆角下的摆心漂移。结合某柔性接头的实验结果分别研究了摆杆形变、水平位移传感器推杆测量误差、铅垂位移传感器推杆测量误差及铅垂传感器水平方向偏移这4种误差对摆心漂移的影响,并研究了柔性接头自身结构误差对于摆心漂移测量的影响。结果表明:修正4种误差后的测量结果与仿真结果吻合良好,证实了摆心漂移测量的误差来源,其中水平位移传感器推杆测量误差占柔性接头摆心漂移圆柱包络面高的总误差的65.98%,铅垂位移传感器推杆测量误差占接头摆心漂移包络面半径总误差的77.32%;柔性接头自身结构的误差也会影响摆心漂移的测量,弹性件与增强件厚度误差引起的散布趋势较为一致,结果可为柔性接头摆心漂移测量误差分析提供理论指导。
Abstract: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.
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Key words:
- pivot point excursion /
- flexible joint /
- error analysis /
- finite element analysis /
- solid rocket motor
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表 1 橡胶本构模型材料参数
Table 1. Material parameter of elastomer
本构参数 拟合值 μ1/10−5 1.8366 α1 10.303 μ2 21.539 α2 0.02659 表 2 柔性接头摆心漂移测量中的误差
Table 2. Measuring errors of pivot point excursion test for flexible joint
δi,test/(°) δi/(°) wh-up,i/mm wh-down,i/mm Δlh+ΔlR/mm Δlv/mm Δla/mm 1.06 1.00 0.0814 0.0365 0.0895 0.030 0.0174 2.21 2.10 0.136 0.0611 0.137 0.064 0.0366 3.42 3.27 0.184 0.0826 0.257 0.078 0.0572 4.63 4.45 0.235 0.105 0.284 0.067 0.0778 5.92 5.70 0.290 0.130 0.241 0.067 0.0998 7.35 7.07 0.366 0.164 0.230 0.040 0.124 7.81 7.52 0.378 0.169 0.141 0.0292 0.132 表 3 柔性接头摆心漂移测量中各项误差的比重
Table 3. Proportion of errors in the test of pivot point excursion for flexible joint
参数 误差比重/% wh-up,i与wh-down-i Δlh+ΔlR Δlv Δla 圆柱
包络面高 33.56 65.98 0.11 0.35 半径 7.47 15.04 77.32 0.18 -
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