【作者】 王金童；

【导师】 戴振东； 吉爱红；

【作者基本信息】 南京航空航天大学 ， 机械设计及理论， 2009， 硕士

【摘要】 大壁虎能够在全空间自由运动,而蜘蛛可以在崎岖的地面稳定运动。通过深入了解它们爬行过程中脚掌与不同表面之间接触力的变化规律,研究其运动的步态特征,可以为步足机器人的设计和制造提供依据和有益启示,同时加深对生物运动的理解。本文采用以三维力传感器为核心的动物运动力测试系统,测试壁虎在垂直墙面运动过程中(向上、向下、横向运动),脚掌与表面接触时产生的三维接触力,同时采用高速摄像系统同步记录壁虎的运动过程。另外分别运用高速摄像系统和力学测试平台测试虎纹捕鸟蛛的运动步态及反力。壁虎运动速度主要依靠步频的提高来提高运动速度,随着速度的提高支撑时间线性降低,向上和向下爬行时脚掌的负荷因素也线性降低,横向爬行时负荷因素与速度的线性关系不显著,粘附时间和脱附时间与速度没有线性关系。壁虎在向上和向下运动中,在身体上方的脚掌受负法向力作用将身体拉向墙面,下方脚掌法向力方向在运动中发生变化;侧向力指向身体外侧。横向运动中,身体上方的脚掌受到侧向力大于下方脚掌的侧向力;前脚驱动力的方向在运动中发生变化,后脚的驱动力单向;在法向力方面,身体上方的脚掌受负法向力作用,将身体拉向墙面,下方脚掌受正法向力作用。墙面运动中,上方脚掌的牵引力是保证运动稳定的关键。虎纹捕鸟蛛运动速度的增加主要依靠步频的线性提高来实现;运动稳定性优于昆虫;在运动中其质心的速度和高度周期波动,步足替换状态下质心的高度和速度均较高,稳定运动状态下质心的高度和速度均较低。蜘蛛的1步足主要起缓冲的作用;2步足和3步足主要是支撑身体,并辅助驱动身体;蜘蛛前进的驱动力主要由4步足提供;侧向力均指向身体中线;蜘蛛各步足运动中的作用与四足爬行动物相比更类似于六足爬行姿态动物。更多还原

【Abstract】 It is well known that the Gekko Gecko has the ability of free running in three-dimensional space, while the spider is good at crawling in uneven ground. It’s useful for the design of the climbing robot by studying their gait character and contact force while running on the different surfaces.The research objects in this paper are locomotion of Gecko on the vertical surface and the Ornithoctonus huwena on the level surface. The regularity of surface reaction force was studied by the animal reaction force measurement system which is mainly composed by three-dimensional force sensor array. Meanwhile the locomotion of gecko running upward, downward and sidelong on the vertical surface was recorded synchronously by the high speed camera. The research method was used to test the gait and reaction force of the Gecko and the Ornithoctonus huwena as well. The measurement of gait and reaction force was separate.The velocity of the Gecko is mainly determined by the stride frequency, the stance period and the duty factor would linear decrease as the velocity increased when running up and down. There are no significant linear relationships between the velocity and duty factor when running sidelong, and the attachment and detachment time as well.In the locomotion of upward and downward, the fluctuant Gecko body movement was drived by the effect of the fore-aft force and gravity. The normal reaction force is different between the upper and the below pads, the normal force of the upper pads pulled toward to the wall while below pads pushed away from the vertical surface. In the locomotion of sidelong, the lateral forces were made to against the gravity, the value of the upper pads are greater than the below pads. The normal force of the upper pads pull toward, and it reverse in the below pads. The direction of the forefeet fore-aft force changes in the locomotion while it goes constant in the hind feet. To sum up, the key factor for stable and flexible movement is the force of the upper pads.The velocity of the Ornithoctonus huwena is also determined by the stride frequency, it runs more stable than other insects. Moving on the level surface, the locomotion includes two stages: moving stable and exchanging the functional feet. The velocity and the height of mass center change periodic. In the exchanging stage, the velocity and height of mass center is much higher than that in the moving stage. Foot 1 & foot 3 at one side and foot 2 & foot 4 at the other side support and drive spider’s body as a group. And the two groups work alternately. The increase velocity of is mainly achieved by the increase of stride frequency. The velocity is near with stride the frequency. The velocity and height of mass center of spiders are fluctuating during movement. The movement stability of Ornithoctonus huwena is better than insects. The velocity and height of mass center are high when spiders are in feet alternation, but they are low when spiders are in steady state of movement.更多还原