含主动约束阻尼悬臂梁两种减振机理的模拟

Simulation of Two Damping Mechanisms of Cantilever Beam with Active Constrained Layer Damping

以部分贴敷主动约束阻尼(active constrained layer damping,简称ACLD)悬臂梁为对象,研究了其所包含的两种减振机理的模拟方法。首先,通过分析ACLD结构的受力及变形,描述了ACLD减振中所包含的黏弹性层剪切耗能和压电层反相阻滞作用两种减振机理;其次,将黏弹性剪切变形体现在形函数中,再结合压电方程与力学公式推导出压电阻滞力,创建了包含两种减振机理的ACLD处理复合梁的动力学模型;最后,通过组建的ACLD悬臂梁减振实验系统对仿真分析结果进行了验证,同时对比分析了仅包含被动约束阻尼或压电反相阻滞单一减振机制以及ACLD处理时复合梁的时域响应。结果表明:仿真计算与实验值的最大偏差为18.6%,证明了所创建的包含两种减振机理分析模型的合理性;ACLD由于同时包含两种减振机理,其减振效果要优于单一的振动控制方法。

A cantilever beam with partially coated active constrained layer damping(ACLD)is taken as the object to study the simulation methods of two vibration reduction mechanisms involved in the vibration control technology.Firstly,by analyzing the force and deformation of the ACLD structure,the two vibration damping mechanisms of the viscoelastic layer and the piezoelectric layer′s anti-phase retardation included in the ACLD vibration damping are described.Then,the viscoelastic shear deformation is expressed in the shape function and the piezoelectric retardative force is deduced by combining the piezoelectric equation and mechanical formula.The dynamic model of the ACLD treated composite beam with two kinds of damping mechanism iss established.Finally,an experimental study is carried out,and the simulation analysis results are verified through the ACLD cantilever beam vibration reduction experimental system.At the same time,the time-domain response of the composite beam when only a single damping mechanism including passive constrained damping or piezoelectric reversed phase blocking mechanism and ACLD processing is compared and analyzed.The results show that the maximum deviation between the simulation and experimental values is 18.6%,proving the rationality of the dynamic analysis model which contains two kinds of vibration damping mechanisms.Active constrained layer damping contains two kinds of damping mechanisms at the same time,so its damping effect is better than the other two vibration control methods which only contain a single damping mechanism.