Damping and mode shape modification for additively manufactured walls with captured powder

Schmitz, Tony L.; Gomez, Michael; Ray, Barrett; Heikkenen, Eric; Sisco, Kevin; Haines, Michael; Osborne, Jessica S.

doi:10.1016/j.precisioneng.2020.07.002

Cited by 12 publications

(9 citation statements)

References 14 publications

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Section: Reviewmentioning

confidence: 99%

“…One possibility to increase the damping in laser beam melted structural components is to integrate the effect of particle damping [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. By means of particle dampers, produced by laser powder bed fusion (LPBF), vibrations can be reduced by more than a factor of 20 in some cases [7,10,12]. The powder bed-based process allows the particles to be integrated directly into the cavities of the component during the manufacturing process, thus further increasing the high degree of functional integration.…”

Section: Reviewmentioning

confidence: 99%

“…Schmitz et al investigated the effect of particle damping using laser beam melted walls of 316L by pulse hammer excitation [10]. Here, the damping was characterized as a function of cavity height for the first three modes in a frequency range up to 3000 Hz.…”

Section: Applications and Research Activitiesmentioning

confidence: 99%

“…In the field of additive manufacturing, especially in powder bed-based processes, the effect of particle damping represents a hitherto little-researched but very effective method for reducing vibrations [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Particle dampers produced by laser powder bed fusion (LPBF) can reduce vibrations by more than a factor of 20 in a wide frequency range [7,10,12].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, modelling is challenging due to highly non-linear properties [21][22][23]. Initial approaches to describing the effect of particle damping focus on limited parameter studies on additively manufactured primitives [7,9,10,[12][13][14]16,17]. Isolated demonstrators such as cutting tool holders, braking discs or motorcycle triple clamps have also been considered [8,16,18].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Design of Particle Dampers for Laser Powder Bed Fusion

Ehlers

Lachmayer

2022

Applied Sciences

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Additively manufactured particle dampers can significantly improve component damping. However, if designed incorrectly, the damping can be worsened. For the design of additively manufactured particle dampers, there are not yet sufficient design rules and models to describe the effect due to numerous design parameters. The research question answered in this paper describes how the effect of particle damping can be characterised as a function of excitation force and excitation frequency for different cavity sizes. To characterise the effect of particle damping, a 33 full factorial test plan is constructed, and the damping is determined experimentally. It is shown that the damping can be reliably evaluated with the circle-fit method. The effect of particle damping is investigated for beams made of AlSi10Mg, 1.2709 and Ti6Al4V. As a result, a positive effect of the particle damping in a frequency range from 500 to 30,000 Hz and partly up to the 9th bending mode can be proven. It is shown that, for the first bending mode, there is an optimum at approx. 2000 Hz. For the optimum, the increase of the damping for the tool steel 1.2709 to 28 and for the aluminium alloy AlSi10Mg to 18 can be proven.

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