An investigation of frequency domain dispersion correction of pressure bar signals
An investigation of frequency domain dispersion correction of pressure bar signals
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DOI：
10.1016/s0734-743x(00)00025-7
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发表时间：
2001-01-01
影响因子：
5.1
通讯作者：
Watson, AJ
中科院分区：
文献类型：
--
作者：
Tyas, A;Watson, AJ
频域方法多年来一直被用于离散实验压杆信号的校正。然而，这种方法的准确性仅根据假设的载荷函数的力-时间历史进行了评估，而不是根据先验的已知载荷进行评估。此外，这种方法目前没有考虑Pochammer-Chree理论对轴向应变沿杆半径变化的预测，以及轴向应力与应变的关系。在本工作中，已知力-时间历史被应用于压杆的有限元模型的冲击面。离散信号被记录在距冲击面一定距离的杆周上，并应用频域校正方法试图重建未分散的强迫函数。结果表明，即使对于含有中高频的信号，如果在色散校正方法中结合Pochammer-Chree应变变化和应力-应变关系的结果，也可以很好地重建强迫函数。(C)2000爱思唯尔科学有限公司。保留所有权利。
The frequency-domain method has been used for several years for the correction of dispersed experimental pressure bar signals. However, the accuracy of this method has been assessed only against assumed force-time histories of the loading function, not against a priori known loads. Further, this method presently fails to take into account predictions from the Pochammer-Chree theory for both the variation of axial strain over the bar radius, and the relation between axial stress and strain. In the current work, a known force-time history is applied to the impact face of a finite element model of a pressure bar. The dispersed signal is recorded on the bar perimeter some way from the impact face, and the frequency domain correction method applied in an attempt to re-construct the undispersed forcing function. It is demonstrated that, even for signals containing moderately high frequencies, excellent reconstruction of the forcing function can be achieved if the Pochammer-Chree results for strain variation and stress-strain relation are incorporated in the dispersion correction method. (C) 2000 Elsevier Science Ltd. All rights reserved.