论文标题
模态能量散射和摩擦对造影吸收器的共振缓解的影响
Effects of modal energy scattering and friction on the resonance mitigation with an impact absorber
论文作者
论文摘要
可以调节线性振动吸收器以有效抑制特定振动模式的共振。它依赖于狭窄和固定频带内的目标能量转移到吸收器中。非线性能量下沉（NES）具有类似的工作原理。它们在更广泛的频带中有效，但通常仅在有限的激发水平上。为了设计NE，必须彻底理解其工作原则。我们考虑了一种特定类型的NE，在基础结构（Vibro-Impact nes或撞击吸收器）的腔内受到影响的小质量和干摩擦。首先重新审视近谐振强迫和由此产生的操作范围下的非线性动态制度。然后，我们研究了通过撞击和干摩擦造成振动抑制的非谐振振动模式和消散。此外，与线性调谐振动吸收器（LTVA）和具有相同质量的纯摩擦阻尼器相比，我们评估了撞击吸收器对抑制多种共振的有效性。
A linear vibration absorber can be tuned to effectively suppress the resonance of a particular vibration mode. It relies on the targeted energy transfer into the absorber within a narrow and fixed frequency band. Nonlinear energy sinks (NES) have a similar working principle. They are effective in a much wider frequency band but generally only in a limited range of excitation levels. To design NES, their working principle must be thoroughly understood. We consider a particular type of NES, a small mass undergoing impacts and dry friction within a cavity of a base structure (vibro-impact NES or impact absorber). The nonlinear dynamic regimes under near-resonant forcing and resulting operating ranges are first revisited. We then investigate how off-resonant vibration modes and dissipation via impacts and dry friction contribute to the vibration suppression. Moreover, we assess the effectiveness of the impact absorber for suppressing multiple resonances in comparison to a linear tuned vibration absorber (LTVA) and a pure friction damper with the same mass.
