MECHANICS OF THE STARTLE RESPONSE IN THE NORTHERN PIKE, ESOX-LUCIUS
MECHANICS OF THE STARTLE RESPONSE IN THE NORTHERN PIKE, ESOX-LUCIUS
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DOI：
10.1139/z91-399
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发表时间：
1991-11-01
期刊：
影响因子：
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通讯作者：
BLAKE, RW
中科院分区：
文献类型：
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作者：
FRITH, HR;BLAKE, RW
在逃逸反应（C-启动）的北方梭子鱼，狗鱼（0.41米总长度，0.398公斤），加速专家，产生的推力估计使用Weihs模型的鱼快速启动。高速电影胶片记录（250赫兹）的派克C-开始数字化和攻角和位移的所有身体部分确定。这些参数被纳入模型和推力计算。比较模型预测值预测所需的力量发现六个八个性能参数在22%以内的三个快速启动。模型估算值和所需力之间没有显著差异，这表明升力和加速力是C型快速启动期间总推力的主要组成部分。在推进阶段（阶段2），尾部区域，包括尾鳍、臀鳍和背鳍，对正总推力的贡献最大（> 90%）。高速度、大攻角和这些截面的大表面积说明了这一点。在推进阶段，大约77%的总推力是由尾鳍产生的，28%是由臀鳍和背鳍产生的。在快速启动过程中平均的升力大于平均加速力，但当只考虑推进级的正加速力时，平均升力和加速力是相似的（分别占总正力的60%和43%）。此外，加速力比升力更早达到峰值，并有助于更早的逃逸响应。
The thrust produced during an escape response (C-start) of a northern pike, Esox lucius (0.41 m total length, 0.398 kg), an acceleration specialist, is estimated using the Weihs model for fish fast-starts. High-speed cine film records (250 Hz) of pike C-starts were digitized and the angle of attack and displacement of all body sections determined. These parameters were incorporated into the model and thrust was calculated. A comparison of model predictions with values predicted from required forces found six of eight performance parameters to be within 22% for three fast-starts. A lack of significant difference between model estimates and required forces suggests that lift and acceleration forces are the major components of total thrust during C-type fast-starts. The caudal region, including the caudal, anal, and dorsal fins, contributes the most (> 90%) to positive total thrust during the propulsive stage (stage 2). High velocities, large angles of attack, and large surface areas of these sections account for this. Approximately 77% of the positive total thrust during the propulsive stage is generated by the caudal fin and 28% by the anal and dorsal fins. Lift forces averaged over the fast-start are greater than average acceleration forces, but when positive acceleration forces of the propulsive stage only are considered, average lift and acceleration forces are similar (60 and 43% of total positive forces, respectively). Also, acceleration forces peak earlier than lift forces and contribute to an earlier escape response.