Vibro-impact (VI) phenomenon can be used in vibration absorbers to reduce low frequency vibrations on a fast time scale. VI absorbers are effective on a wide range of frequency, they are also known to be robust and insensitive to temperature changes, and they do not rely on visco-elastic materials. This solution offers very interesting and promising possibilities for vibration suppression in harsh environments where classical solutions can be pushed to their limits. If previous works have extensively studied VI based solutions numerically, mostly applied to single degree of freedom systems, experimental works dealing with continuous and multi-modal structures have received less attention. The work proposed in this paper focuses on the vibration reduction of a beam using a VI absorber with adjustable clearance. A parametric study on the clearance of the absorber has been performed. The response of the beam under harmonic excitation demonstrates the existence of an optimal clearance that leads to the lowest level of vibration of the beam. A relation between the gap value, the excitation amplitude and the response is found and can be translated into an attractive scalability property. The well-known regimes with two impacts per cycle and the Strongly Modulated Regime (SMR) have been clearly identified on the beam response, their relation with the optimal design of the absorber is highlighted, and their mechanism is explained. The present results open up new perspectives for vibro-impact absorbers, especially concerning their technological development and optimal design.

振动冲击 (VI) 现象可用于减振器，以快速减少低频振动。VI 吸收器在很宽的频率范围内都有效，它们也被称为坚固耐用且对温度变化不敏感，并且它们不依赖于粘弹性材料。该解决方案为恶劣环境中的振动抑制提供了非常有趣和有希望的可能性，在这些环境中，经典解决方案可能会被推向极限。如果以前的工作在数值上广泛研究了基于 VI 的解决方案，主要应用于单自由度系统，那么处理连续和多模态结构的实验工作受到的关注较少。本文提出的工作重点是使用具有可调间隙的 VI 吸收器来减少梁的振动。已经对吸收器的间隙进行了参数研究。梁在谐波激励下的响应表明存在导致梁振动最低水平的最佳间隙。发现间隙值、激励幅度和响应之间的关系，并且可以转化为有吸引力的可扩展性属性。每个周期两次冲击的著名机制和强调制机制 (SMR) 已在光束响应上得到明确识别，强调了它们与吸收器优化设计的关系，并解释了它们的机制。目前的结果为振动冲击吸收器开辟了新的视角，特别是在它们的技术开发和优化设计方面。梁在谐波激励下的响应表明存在导致梁振动最低水平的最佳间隙。发现间隙值、激励幅度和响应之间的关系，并且可以转化为有吸引力的可扩展性属性。每个周期两次冲击的著名机制和强调制机制 (SMR) 已在光束响应上得到明确识别，强调了它们与吸收器优化设计的关系，并解释了它们的机制。目前的结果为振动冲击吸收器开辟了新的视角，特别是在它们的技术开发和优化设计方面。梁在谐波激励下的响应表明存在导致梁振动最低水平的最佳间隙。发现间隙值、激励幅度和响应之间的关系，并且可以转化为有吸引力的可扩展性特性。每个周期两次冲击的著名机制和强调制机制 (SMR) 已在光束响应上得到明确识别，强调了它们与吸收器优化设计的关系，并解释了它们的机制。目前的结果为振动冲击吸收器开辟了新的视角，特别是在它们的技术开发和优化设计方面。找到了激发幅度和响应，并且可以将其转化为有吸引力的可扩展性属性。每个周期两次冲击的著名机制和强调制机制 (SMR) 已在光束响应上得到明确识别，强调了它们与吸收器优化设计的关系，并解释了它们的机制。目前的结果为振动冲击吸收器开辟了新的视角，特别是在它们的技术开发和优化设计方面。找到了激发幅度和响应，并且可以将其转化为有吸引力的可扩展性属性。每个周期两次冲击的著名机制和强调制机制 (SMR) 已在光束响应上得到明确识别，强调了它们与吸收器优化设计的关系，并解释了它们的机制。目前的结果为振动冲击吸收器开辟了新的视角，特别是在它们的技术开发和优化设计方面。