Measurement of working coil temperature in electromagnetic forming processes by means of optical frequency domain reflectometry
Measurement of working coil temperature in electromagnetic forming processes by means of optical frequency domain reflectometry
复制标题
利用光频域反射仪测量电磁成形过程中的工作线圈温度
DOI：
10.1016/j.csndt.2015.02.001
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Tekkaya
中科院分区：
文献类型：
--
作者：
Langolf;Weddeling;Tekkaya
工作线圈中高达50%的焦耳热损失使热负载成为电磁成形过程中线圈寿命的关键影响因素。因此，特别是在循环时间短的放电序列的情况下，关于温度分布的知识对于避免热过应力是必不可少的。提出了一种电磁成形过程中工作线圈内部温度的测量方法。基于光纤频域反射技术（OFDR），确定了线圈内部温度的时空分布。提供了长期放电序列的温度曲线。实验结果证明了该测量技术在电磁成形过程中的可行性。由于相对较高的采集速率，可以详细分析两次放电之间的温度升高和降低。这为过程分析和监测提供了新的可能性。特别是针对减少热负荷的方法的有效性，可以很容易地使用所提出的测量技术。
Joule heating losses in the working coil of up to 50% make thermal loads a crucial influencing factor on the coil lifetime in electromagnetic forming processes. Thus, especially in case of discharge sequences with short cycle times knowledge about the temperature distribution is essential to avoid thermal overstressing. This paper presents an approach for temperature measurement inside the working coil during the electromagnetic forming process. Based on fiber-based optical frequency domain reflectometry (OFDR), the spatio-temporal temperature distribution inside the coil is determined. Temperature profiles for long-term discharge sequences are provided. The results prove the qualification of this measurement technique for electromagnetic forming processes. Due to the comparatively high acquisition rate the temperature increase and drop between two discharges can be analyzed in detail. This renders new possibilities for process analysis and monitoring. Especially the effectiveness of approaches aiming at a decrease of thermal loading can be rated easily using the presented measurement technique.
DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
H. Ghafouri
通讯作者：
H. Ghafouri
影响因子：
6.3
作者：
S. Gies;C. Löbbe;C. Weddeling;A. Tekkaya
通讯作者：
S. Gies;C. Löbbe;C. Weddeling;A. Tekkaya
影响因子：
1.6
作者：
H. Furth;R. W. Waniek
通讯作者：
R. W. Waniek