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首页> 外文期刊>Biomechanics and modeling in mechanobiology >Aorta in vivo parameter identification using an axial force constraint
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Aorta in vivo parameter identification using an axial force constraint

机译:使用轴向力约束的主动脉体内参数识别

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摘要

It was shown in a previous study by Stalhand et al. (2004) that both material and residual strain parameters for an artery can be identified noninvasively from an in vivo clinical pressure–diameter measurement. The only constraints placed on the model parameters in this previous study was a set of simple box constraints. More advanced constraints can also be utilized, however. These constraints restrict the model parameters implicitly by demanding the state of the artery to behave in a specified way. It has been observed in vitro that the axial force is nearly invariant to the pressure at the physiological operation point. In this paper, we study the possibility to include this behaviour as a constraint in the parameter optimization. The method is tested on an in vivo obtained pressure–diameter cycle for a 24-year-old human. Presented results show that the constrained parameter identification procedure proposed here can be used to obtain good results, and we believe that it may be applied to account for other observed behaviours as well.
机译:Stalhand等人先前的研究表明了这一点。 (2004),可以通过体内临床压力-直径测量无创地识别动脉的材料和残余应变参数。在先前的研究中,对模型参数施加的唯一约束是一组简单的盒子约束。但是,也可以使用更高级的约束。这些约束通过要求动脉状态以指定的方式运行而隐式地限制了模型参数。在体外已经观察到,轴向力对于生理操作点处的压力几乎不变。在本文中,我们研究了将这种行为作为约束条件纳入参数优化的可能性。该方法在体内获得的24岁男性的压力-直径循环上进行了测试。提出的结果表明,此处提出的约束参数识别过程可用于获得良好的结果,并且我们认为它也可用于解决其他观察到的行为。

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