碳纤维复合材料丝束带剪断状态快速检测方法
Rapid Cut State Detection for Carbon Fiber Composite Tow

为解决在狭小空间内无法准确有效识别碳纤维丝束带剪断状态的问题,提出了一种基于电信号的碳纤维丝束带剪断状态的检测方法,并设计了相应的剪断状态监测硬件及软件系统。该检测方法首先通过简单的检测电路以及数据采集卡,实现对碳纤维丝束带剪断过程中的电信号实时采集,然后对采集得到的信号进行低通滤波处理,获取电压信号的峰值,将峰值与设定的检测阈值相比较,可以有效识别出碳纤维丝束带的剪断情况。实验结果表明,在进行剪断操作时,未完全剪断的碳纤维丝束带电阻为10～500 Ω,而完全剪断的丝束带电阻为无穷大,将丝束带与检测电路连接,电阻的变化即可反映到两电极间的电压变化。实验中,完全剪断时,丝束带两端电压从0 V大幅跃升到4？？377 03 V,大于设定的阈值,而未完全剪断时,丝束带两端电压从0 V小幅跃升到0 067 97 V,小于设定的阈值1 V,均可有效识别剪断状态,证明该方法检测结果较为准确。该方法可以在铺丝头内部的狭小空间进行检测,同时能够快速识别出碳纤维丝束带的剪断状态。
It is difficult to identify the cut state of fiber tow in a small space. A rapid cut state detection strategy for carbon fiber composite tow is proposed following the electrical signal measurement, and the corresponding cut state detection system is constructed. The electrical signals generating during the process of cutting are collected by a simple circuit and DAQ card, then filtered by low？？pass filter to obtain the peak value of the signal. The peak value is compared with the rated threshold of 1 V to identify whether the fiber tow is completely cut off or not. In the experiment, the resistance of fiber tow which is not completely cut off gets 10 to 500 Ω, while the resistance of fiber tow which is completely cut off reaches infinity. Connecting the fiber tow with the electrodes in the circuit, the changed resistance value directly affects the voltage value between both electrodes. When the fiber tow is completely cut off, the voltage increases from 0 to 4？？377 03 V, higher than the threshold. When the fiber tow is not completely cut off, the voltage increases from 0 to 0？？067 97 V, lower than the threshold. Both of the cut states can be identified effectively and quickly. This detection can be realized in a very small space, even inside the AFP robot head