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海洋钻井平台支撑结构均为管桁结构,依据焊接规范,管件的坡口角由相贯管件二面角确定,而多数相贯二面角沿其周向变化,导致实际装配时二面角无法测量;此外,由于相交管件偏心的存在,导致理论坡口角与实际切割角存在一定偏差,综上所述,相贯管件端口实际切割角度数据具有随二面角和偏心值变化的特点。利用空间几何向量及线性代数等数学知识建立相交管件的相贯线数学模型,导出了管件实际相贯线及切割角计算公式,利用MATLAB软件计算相贯管件端口切割角数据,通过将其作为相贯管件坡口角度的现场检测依据,用于检验数控切割指令正确性及切割设备的可靠性。以某钻井平台桩腿管件为例,对单重相交管件和简单二重相交管件的切割角度的进行了计算。算例显示,计算结果均在误差范围内(±5°),证明了切割指令的正确性及切割设备的可靠性。
According to welding specifications, the bevel angle of the pipe is determined by the dihedral angle of the pipe intersecting, and the majority of the dihedral angles of the intersecting changes along the circumference of the pipe, resulting in the unmeasurable dihedral angle in the actual assembly In addition, due to the existence of intersecting pipe eccentricity, there is a certain deviation between the theoretical groove angle and the actual cutting angle. In summary, the actual cutting angle data of the intersecting pipe fittings has the characteristics of changing with dihedral angle and eccentricity value. The mathematical model of the intersecting line of intersecting pipe was established by using mathematical knowledge of space geometric vector and linear algebra. The formulas for calculating the intersecting line and the cutting angle of the pipe were deduced. Using MATLAB software to calculate the intersecting pipe port cutting angle data, Tube based on the angle of the site inspection site inspection, used to test the accuracy of CNC cutting instructions and cutting equipment reliability. Taking a leg of a drilling platform as an example, the cutting angle between the single intersecting pipe and the simple double intersecting pipe was calculated. The example shows that the calculation results are within the error range (± 5 °), which proves the correctness of the cutting instructions and the reliability of the cutting equipment.