Predicting the impact response of a nonlinear single-degree-of-freedom shock-absorbing system from the measured step response.
Predicting the impact response of a nonlinear single-degree-of-freedom shock-absorbing system from the measured step response.
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根据测量的阶跃响应预测非线性单自由度减震系统的冲击响应。
DOI：
10.1115/1.2796083
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
McMahon,TA
中科院分区：
文献类型：
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作者：
Robinovitch,SN;Hayes,WC;McMahon,TA
我们测量了一个替代人骨盆/冲击摆系统在50和350 N之间的力水平的阶跃响应。然后，我们用四个不同的单自由度模型拟合测量的响应曲线，每个模型都有一个质量，并支持以下类型：标准线性固体，Voigt，麦克斯韦和弹簧。然后，我们比较了模型预测的冲击力在高能量碰撞（摆锤冲击速度范围从1.16到2.58米/秒），从实际的影响，以替代骨盆的力的痕迹。我们发现，测量的峰值冲击力，范围从1700到5600 N，最好的预测质量弹簧，麦克斯韦，和标准的线性固体模型，其中每一个的平均误差小于3%。对于常用的Voigt模型，观察到准确性降低，平均误差为10%。考虑到在这项研究中使用的替代骨盆系统表现出非线性刚度和阻尼与人类志愿者在模拟跌倒冲击实验中观察到的相似，我们的研究结果表明，这些简单的模型允许在潜在的创伤性福尔斯的冲击力被预测到合理的准确度从测量的响应的身体在安全，模拟碰撞。
We measured the step response of a surrogate human pelvis/impact pendulum system at force levels between 50 and 350 N. We then fit measured response curves with four different single-degree-of-freedom models, each possessing a single mass, and supports of the following types: standard linear solid, Voigt, Maxwell, and spring. We then compared model predictions of impact force during high-energy collisions (pendulum impact velocity ranging from 1.16 to 2.58 m/s) to force traces from actual impacts to the surrogate pelvis. We found that measured peak impact forces, which ranged from 1700 to 5600 N, were best predicted by the mass-spring, Maxwell, and standard linear solid models, each of which had average errors less than 3 percent. Reduced accuracy was observed for the commonly used Voigt model, which exhibited an average error of 10 percent. Considering that the surrogate pelvis system used in this study exhibited nonlinear stiffness and damping similar to that observed in simulated fall impact experiments with human volunteers, our results suggest that these simple models allow impact forces in potentially traumatic falls to be predicted to within reasonable accuracy from the measured response of the body in safe, simulated collisions.