开缝衬套成形过程声发射在线监测系统设计

为提高开缝衬套的双轴柔性滚弯成形质量,设计了一套基于声发射信号和虚拟仪器的在线监测系统,该系统主要由数据采集软件、数据采集卡、声发射传感器以及信号调理电路构成,实现对双轴柔性滚弯成形过程的声发射信号进行采集、显示、分析和存储,为开缝衬套双轴柔性滚弯成形过程控制和质量预测提供数据支持.通过实验对比分析了开缝衬套的双轴柔性滚弯过程声发射信号的时域和频域特性.实验结果表明,该在线监测系统响应速度快,性能稳定,能够可靠地实现对开缝衬套双轴柔性滚弯成形过程声发射信号的在线监测.

Design of On-line Acoustic Emission Monitoring System for Two-axle Roll-bending of Split Sleeve

To improve the forming quality of split sleeve during two-axle roll-bending, an on-line monitoring system based on virtual instrument and acoustic emission was designed. The system was mainly composed of data acquisition software, data acquisition card, acoustic emission sensor and signal conditioning circuit, and it had functions of signal acquisition, signal indication, signal analysis and signal storage in the two-axle roll-bending process, which can provide the data support for the process control and quality prediction of two-axle roll-bending. The time domain and frequency domain features of the acoustic emission signal were compared and analysed during the experiment of two-axle roll-bending. The experiment results show that the on-line monitoring system have characteristics of both fast response and high stability, which can reliably realize the real-time monitoring of acoustic emission signal during the process of two-axle roll-bending of split sleeve.