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通过对均质等截面圆管所受到的轴向力、弯矩、扭矩进行分离,利用光纤布拉格光栅应变传感器对管状工件的轴向力、弯矩、扭矩进行了测量。引入4个光纤光栅应变传感器,将其中3个沿轴向粘贴在铝合金圆管同一横截面的外侧,彼此间的圆心角为120°,第4个沿与轴向成45°夹角的方向粘贴,对横截面处的轴向力、弯矩、扭矩进行测量;与理论值相比,三者的误差分别为4.98%、4.55%、4.70%;考虑多种因素对测量结果的影响,基本能满足工程上的应用要求,从而验证了此测量方法的可靠性。该技术为管状工件力学参数在线监测提供了新的方案。
By analyzing the axial force, bending moment and torque of the uniform cross section tube, the axial force, bending moment and torque of the tubular workpiece were measured by fiber Bragg grating strain sensor. Four FBG strain transducers were introduced. Three of them were axially affixed to the outside of the same cross-section of the circular tube of aluminum alloy. The central angles between them were 120 ° and the fourth along the direction of 45 ° from the axial direction The axial force, the bending moment and the torque at the cross section were measured. Compared with the theoretical value, the errors of the three were 4.98%, 4.55% and 4.70% respectively. Considering the influence of many factors on the measurement results, the basic Can meet the engineering application requirements, thus verifying the reliability of this measurement method. The technology provides a new solution for on-line monitoring of mechanical parameters of tubular workpieces.