Evans E J
J Biomed Eng. 1985 Apr;7(2):144-8. doi: 10.1016/0141-5425(85)90044-5.
The frequency response, at various points along the length and circumference, of two isolated human ulnas has been recorded during white noise excitation under 'free-free' conditions. Both bones showed a similar pattern of multiple frequencies of resonance; two fundamental mode resonances occurring in directions mutually at right angles. Further resonances appeared at higher frequencies, both in the same planes as the fundamental modes and in a second plane at 45 degrees; changing the plane of excitation through 90 degrees produced only small changes in the pattern of resonances. Both bones showed marked coupling between neighbouring resonances, with pulling of the frequencies of resonance so that the frequency of the resonant peak may appear to vary by up to 10%.
在“自由-自由”条件下的白噪声激励过程中，记录了两根孤立的人体尺骨沿长度和圆周不同点处的频率响应。两根骨头都呈现出类似的多共振频率模式；两个基本模式共振出现在相互垂直的方向上。在更高频率处还出现了进一步的共振，既出现在与基本模式相同的平面中，也出现在成45度角的第二个平面中；将激励平面旋转90度只会使共振模式产生微小变化。两根骨头在相邻共振之间都表现出明显的耦合，共振频率被拉拽，以至于共振峰的频率变化可能高达10%。
