基于无线式内窥镜应用的激振胶囊非线性动力学行为研究

Nonlinear dynamic behavior of impact capsule oscillator based on wireless endoscope application

以引入激振冲击结构改进胶囊内窥镜为目的,对具有单边和双边弹性约束的激振胶囊进行了对比研究。通过数值模拟讨论了频率比和振幅比2项激振参数,以及质量比和刚度比2项结构参数对激振胶囊动力学行为演化规律的影响。通过研究发现,单边约束的激振胶囊的推进速度更快,并且其在一周期一次碰撞振动状态下的推进效率高于其他振动状态。而双边约束的激振胶囊的推进速度相对较慢,但双边约束激振胶囊的特点在于能够更好地通过调控冲击振子与两侧弹簧的不同碰撞次数来实现激振胶囊的向前和向后的双向移动,而这为实现对消化道重点区域的往复回看提供了可能性。综上所述,该研究成果对激振胶囊的结构设计和振动控制具有指导意义。

Here,to improve dynamic behavior of a capsule endoscope via introducing an impact oscillator structure,dynamic behaviors of an impact capsule oscillator with unilateral and bilateral elastic constraints were studied contrastively.The effects of two excitation parameters of frequency ratio and amplitude one and two structure parameters of mass ratio and stiffness one on dynamic behavior evolution laws of the impact capsule oscillator were investigated with numerical simulation.The study results showed that the capsule with unilateral constraint moves faster than the one with bilateral constraints does,and its propulsion efficiency under one-period one impact-vibration state is higher than that under other impact-vibration states;the capsule with bilateral constraints has lower propulsion speed but it can realize the two way movement forward and backward via adjusting the number of impact between the impact capsule oscillator and spring constraints at both left and right sides;this bidirectional movement provides the possibility of reciprocating looking back to key areas of human digestive tract;the study results have guiding significance for the structural design and vibration control of the impact capsule oscillator.