Computational and experimental analysis of the impact of a sphere on a beam and the resulting modal energy distribution. (15th November 2022)

• Record Type: Journal Article
• Authors: Gehr, Felix; Theurich, Timo; Monjaraz-Tec, Carlo; Gross, Johann; Schwarz, Stefan; Hartung, Andreas; Krack, Malte
• Is Part Of: Mechanical systems and signal processing. Volume 180(2022)
• Publication Date: 2022-11-15
• Subjects: Impact -- Contact mechanics -- Experimental validation -- Model order reduction -- Mass redistribution; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2022.109407
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: We consider the common problem setting of an elastic sphere impacting on a flexible beam. In contrast to previous studies, we analyze the modal energy distribution induced by the impact, having in mind the particular application of impact vibration absorbers. Also, the beam is analyzed in the clamped–clamped configuration, in addition to the free–free configuration usually considered. We demonstrate that the designed test rig permits to obtain well-repeatable measurements. The measurements are confronted with predictions obtained using two different approaches, state-of-the-art Finite Element Analysis and a recently developed computational approach involving a reduced-order model. The innovative aspect of the latter approach is to achieve a massless contact boundary using component mode synthesis, which reduces the mathematical model order and numerical oscillations. We show that the novel computational approach reduces the numerical effort by 3–4 orders of magnitude compared to state-of-the-art Finite Element Analysis, without compromising the excellent agreement with the measurements. Highlights: Validation of massless-boundary component mode synthesis simulation approach. Problem setting: sphere impacting on free–free/clamped–clamped beam. Excellent agreement between highly repeatable measurement and simulation. Velocity response, force pulse and modal energy distribution analyzed. Novel method 3–4 orders of magnitude faster than state-of-the-art FEA.