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首页> 外文期刊>Journal of mechanics in medicine and biology >EFFECTS OF ACTUATOR IMPACT ON THE NONLINEAR DYNAMICS OF A VALVELESS PUMPING SYSTEM
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EFFECTS OF ACTUATOR IMPACT ON THE NONLINEAR DYNAMICS OF A VALVELESS PUMPING SYSTEM

机译：执行器冲击对无阀泵系统非线性动力学的影响

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摘要

Valveless pumping assists in fluid transport in various biomedical and engineering systems. Here we focus on one factor that has often been overlooked in previous studies of valveless pumping, namely the impact that a compression actuator exerts upon the pliant part of the system when they collide. In particular, a fluid-filled closed-loop system is considered, which consists of two distensible reservoirs connected by two rigid tubes, with one of the reservoirs compressed by an actuator at a prescribed frequency. A lumped-parameter model with constant coefficients accounting for mass and momentum balance in the system is constructed. Based on such a model, a mean flow in the fluid loop can only be produced by system asymmetry and the nonlinear effects associated with actuator impact. Through asymptotic and numerical solutions of the model, a systematic parameter study is carried out, thereby revealing the rich and complex system dynamics that strongly depends upon the driving frequency of the actuator and other geometrical and material properties of the system. The driving frequency dependence of the mean flowrate in the fluid loop and that of the mean reservoir pressures also are examined for a number of representative cases.
机译：无阀泵送有助于各种生物医学和工程系统中的流体输送。在这里，我们关注的是在先前的无阀泵送研究中经常被忽略的一个因素，即当压缩致动器碰撞时，其对系统的柔韧性部分的影响。特别地，考虑一种流体填充的闭环系统，该系统包括通过两个刚性管连接的两个可扩张的容器，其中一个容器由致动器以规定的频率压缩。建立了一个具有恒定系数的集总参数模型，该模型考虑了系统中的质量和动量平衡。基于这种模型，流体环路中的平均流量只能通过系统不对称以及与执行器冲击相关的非线性效应来产生。通过模型的渐近和数值解，进行了系统的参数研究，从而揭示了丰富而复杂的系统动力学，这些动力学很大程度上取决于执行器的驱动频率以及系统的其他几何和材料特性。在许多代表性情况下，还检查了流体回路中平均流量的驱动频率依赖性和平均油藏压力的驱动频率依赖性。

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