面向自动化装配过程的光纤传感调校系统

Optical Fiber Sensor Adjustment System for Automated Assembly Process

摘要:

为了减小装配误差,解决自动装配过程中强迫装配、装配不到位等问题,设计了基于光纤传感的调校系统。该系统由光纤传感阵列、解调模块、调校控制机构组成。提出了应变分布解算模型,推导了波长与位置偏差的函数关系,仿真分析了工件应变敏感区域的分布特征,量化了应变与位置误差的映射关系。实验采用可调施力结构对系统应变监测量进行标定,采用视觉测量对系统位置偏差量进行标定。实验结果显示,位置偏差与波长变化呈线性映射关系,验证了依据波长反演装配位置偏差的可行性。与视觉测量的标准值相比,该系统的位置偏差平均相对误差为8.6%。由此可见,该系统具有实时、精确反演工件应变场的计算能力,在自动化装配中具有很好的应用前景。

Abstract:

In order to reduce assembly errors and solve problems such as forced assembly and incomplete assembly during the automatic assembly process, the optical fiber sensing calibration system was designed. The system consists of a fiber-optic sensor array, a demodulation module, and a tuning control mechanism. A solution model for strain distribution was proposed, and the function relationship between wavelength and position deviation was deduced. The distribution characteristics of the strain sensitive area of the workpiece were analyzed by simulation, and the mapping relationship between strain and position error was quantified. In the experiment, adjustable force structure was used to calibrate the system strain monitoring data, and visual measurement was used to calibrate the system position deviation. The experimental results show that the position deviation has a linear mapping relationship with the wavelength change. It is feasible to invert the deviation of the assembly position by the wavelength. Compared with the standard value of visual measurement, the average relative error of the position deviation of the system is 8.6%. The strain field of the workpiece can be inverted by this system in real time.