Viscoelastic foundation-induced vibrations: Exploring linear theory application fields through numerical simulations

IF 4.9 2区 工程技术 Q1 ACOUSTICS
Simone De Carolis , Carmine Putignano , Leonardo Soria , Giuseppe Carbone
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引用次数: 0

Abstract

This study investigates the dynamic interaction between a massive rigid body and a viscoelastic, non-adhesive flat substrate, behaving as a moving unilateral foundation and, thus, oscillating under various kinematic conditions (stationary sinusoidal, time-varying harmonic, and stochastic excitation). Such a problem is reduced to an equivalent single-degree-of-freedom base-excited system, where the intricate contact interactions involving the oscillating viscoelastic foundation are assessed by introducing a complex dynamic contact stiffness. This model is intrinsically linear and is based on the assumption that variations in the contact area, relative to the contact length in the static equilibrium configuration, may be neglected. Special attention is given to the phenomena of tapping, that is, the contact separation: the latter is clearly related to the amplitude and frequency of the foundation oscillations. An analytical relation, derived within the linear framework, is obtained to predict the incipient tapping front. To establish the application fields of this linear approach, we implement a Boundary Element Method (BEM)-based model that calculates the contact force, iteratively coupling the contact problem with the dynamic equation of the rigid supported mass. The results confirm that the linear model provides accurate predictions for transmissibility and the separation front under low-amplitude oscillations. For higher amplitudes, a specific frequency range emerges, characterized by tapping mode, thereby verifying the model’s capacity to delineate regions of continuous contact and tapping mode. Additionally, under non-stationary excitation conditions, the linear theory effectively predicts the transitions between contact and separation phases.
粘弹性地基诱发振动:通过数值模拟探索线性理论的应用领域
本研究研究了大质量刚体与粘弹性、非粘性平面基底之间的动态相互作用,其表现为移动的单边基础,因此在各种运动学条件(平稳正弦、时变谐波和随机激励)下振荡。该问题被简化为等效的单自由度基础激励系统,其中通过引入复杂的动态接触刚度来评估涉及振荡粘弹性基础的复杂接触相互作用。该模型本质上是线性的,并且基于这样的假设:相对于静力平衡结构中的接触长度,接触面积的变化可以忽略不计。特别注意的是轻叩现象,即接触分离:后者与基础振荡的幅度和频率明显相关。在线性框架内推导出一个解析关系,用于预测初期攻丝锋。为了建立这种线性方法的应用领域,我们实现了基于边界元法(BEM)的接触力计算模型,将接触问题与刚性支承质量的动力学方程迭代耦合。结果表明,线性模型对低振幅振荡下的透射率和分离锋有较好的预测效果。对于较高的振幅,出现了一个特定的频率范围,其特征为轻敲模式,从而验证了模型描述连续接触和轻敲模式区域的能力。此外,在非平稳激励条件下,线性理论有效地预测了接触相和分离相之间的过渡。
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来源期刊
Journal of Sound and Vibration
Journal of Sound and Vibration 工程技术-工程:机械
CiteScore
9.10
自引率
10.60%
发文量
551
审稿时长
69 days
期刊介绍: The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.
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