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首页> 美国卫生研究院文献>Journal of the Royal Society Interface >Surface force spectroscopic point load measurements and viscoelastic modelling of the micromechanical properties of air flow sensitive hairs of a spider (Cupiennius salei)
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Surface force spectroscopic point load measurements and viscoelastic modelling of the micromechanical properties of air flow sensitive hairs of a spider (Cupiennius salei)

机译：蜘蛛的气流敏感毛发的表面力光谱点载荷测量和粘弹性建模（Cupiennius salei）

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The micromechanical properties of spider air flow hair sensilla (trichobothria) were characterized with nanometre resolution using surface force spectroscopy (SFS) under conditions of different constant deflection angular velocities (rad s−1) for hairs 900–950 μm long prior to shortening for measurement purposes. In the range of angular velocities examined (4×10−4−2.6×10−1 rad s−1), the torque T (Nm) resisting hair motion and its time rate of change (Nm s−1) were found to vary with deflection velocity according to power functions. In this range of angular velocities, the motion of the hair is most accurately captured by a three-parameter solid model, which numerically describes the properties of the hair suspension. A fit of the three-parameter model (3p) to the experimental data yielded the two torsional restoring parameters, S 3p=2.91×10−11 Nm rad−1 and =2.77×10−11 Nm rad−1 and the damping parameter R 3p=1.46×10−12 Nm s rad−1. For angular velocities larger than 0.05 rad s−1, which are common under natural conditions, a more accurate angular momentum equation was found to be given by a two-parameter Kelvin solid model. For this case, the multiple regression fit yielded S 2p=4.89×10−11 Nm rad−1 and R 2p=2.83×10−14 Nm s rad−1 for the model parameters. While the two-parameter model has been used extensively in earlier work primarily at high hair angular velocities, to correctly capture the motion of the hair at both low and high angular velocities it is necessary to employ the three-parameter model. It is suggested that the viscoelastic mechanical properties of the hair suspension work to promote the phasic response behaviour of the sensilla.
机译：使用表面力谱（SFS）在不同恒定偏转角速度（rad s −1 ）的条件下，利用纳米分辨率对蜘蛛气流毛发感官（trichobothria）的微机械特性进行了表征。为了测量目的，在缩短之前要长μm。在检查的角速度范围内（4×10 −4 -2.6×10 -1 rad s -1 ），转矩T（研究发现，抵抗运动的Nm）及其时间变化率（Nm s -1 ）会随着屈服速度的变化而变化，并随幂函数变化。在此角速度范围内，通过三参数实体模型可以最准确地捕获头发的运动，该模型以数字方式描述了头发悬浮液的特性。三参数模型（3p）对实验数据的拟合产生了两个扭转恢复参数S 3p = 2.91×10 −11 Nm rad -1 和= 2.77×10 −11 Nm rad -1 和阻尼参数R 3p = 1.46×10 −12 Nm s rad −1 。对于在自然条件下常见的大于0.05 rad s -1 的角速度，发现由两参数Kelvin固体模型给出的角动量方程更为精确。对于这种情况，多元回归拟合得出S 2p = 4.89×10 −11 Nm rad -1 和R 2p = 2.83×10 −14 Nm s rad -1 作为模型参数。尽管在早期工作中主要在高头发角速度上广泛使用了两参数模型，但要正确捕获低角速度和高角速度下的头发运动，则必须使用三参数模型。这表明，毛发悬浮液的粘弹性机械性能起着促进感官的相位响应行为的作用。

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