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首页> 外文期刊>Journal of Biomechanics >Wave dissipation in flexible tubes in the time domain: in vitro model of arterial waves.
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Wave dissipation in flexible tubes in the time domain: in vitro model of arterial waves.

机译：时域中挠性管中的波耗散：动脉波的体外模型。

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Earlier work of wave dissipation in flexible tubes and arteries has been carried out predominantly in the frequency domain and most of the studies used the measured pressure waveform for presenting the results. In this work we investigate the pattern of wave dissipation in the time domain using the separated forward and backward travelling waves in flexible tubes. We tested four sizes of latex tubes of 2m in length each, where a single semi-sinusoidal in shape, pressure wave, was produced at the inlet of each tube. Simultaneous measurements of pressure and flow waveforms were recorded every 5cm along the tubes and wave speed was determined using the pressure-velocity loop method (PU-loop). The measured data and wave speed were used to separate the pressure waveform and wave intensity, into their forward and backward directions, using wave intensity analysis (WIA). Also, the energy carried by the wave was calculated by integrating the relevant area under the wave intensity curve. The peak of the measured pressure waveform increased downstream, however, the peak of the separated forward pressure waveform decreased exponentially along the tube. Wave intensity and energy also dissipated exponentially along the travelling distance. The peaks of the separated pressure and wave intensity decreased in the forward in a similar exponential way to that in the backward direction in all four tube sizes. Also, the smaller the size of the tube the greater wave dissipation it caused. We conclude that wave separation is useful in studying wave dissipation in elastic tubes, and WIA provides a convenient method for determining the dissipation of the energy carried by the wave along the travelled distance. The separated pressure waveform, wave intensity and wave energy dissipate exponentially with the travelling distance, and wave dissipation varies conversely with the diameter of elastic tubes.
机译：柔性管和动脉中的波耗散的早期工作主要是在频域中进行的，并且大多数研究都使用测得的压力波形来表示结果。在这项工作中，我们使用挠性管中分离的前进和后退行波来研究时域中波的耗散模式。我们测试了每种长度为2m的四种尺寸的乳胶管，其中在每个管的入口处产生了一个单正弦形状的压力波。沿管每5厘米记录一次压力和流量波形的同步测量，并使用压力-速度环路方法（PU-loop）确定波速。使用波强度分析（WIA），将测量的数据和波速用于将压力波形和波强度分离为正向和反向。另外，通过对波强度曲线下的相关面积进行积分来计算波所携带的能量。测得的压力波形的峰值向下游增大，但是，分离的正向压力波形的峰值沿管道呈指数下降。波强度和能量也沿行进距离呈指数消散。在所有四个管道尺寸中，分离的压力和波强度的峰值都以与向后方向相似的指数方式向前减小。同样，管子的尺寸越小，它引起的波消散就越大。我们得出结论，波分离对于研究弹性管中的波耗散是有用的，WIA提供了一种方便的方法来确定波沿行进距离所携带的能量的耗散。分离的压力波形，波强度和波能量随行进距离呈指数消散，波消散随弹性管的直径成反比变化。

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