家狗随机振动响应及非线性特性的试验研究

Investigation of Nonlinear Dynamic Responses to Random Vibration in Dog

为研究动物的动力学响应特征,在6条狗体内不同部位植入了加速度传感器。观察了头尾向随机振动下L_5、L_6、L_7、肝、胃、胸臂和腹壁的传递性。振动频率为1～250Hz,加速度为1、2、3G。不同部位传递函数的幅频特性表明共振频率相近,但相位差有别。动物共振频率随着振动G 值的增加而降低。并且还证明部分腹腔内脏的响应可由体表胸腹壁的响应评价。

In order to investigate the dynamic responses of animal body,trans-ducers were implanted in various body parts of 6 dogs.Transmissibili-ties of L5,L6,L7,liver,stomach,chest and abdominal wails wereobserved in verticle position under 1,2 and 3 G random vibrationsof 1-250 Hz in cephalo-coccyx direction.The moduli of transfer func-tion showed that resonance frequencies were substentially the sameat various parts of dog/s body,while phase shift existed at certainparts.The frequency of fundamental resonance decreased with increaseof G levels of vibration.The responses of partial viscera can be es-timated from responses of chest and abdominal walls.