Eigenfrequency maximisation by using irregular lattice structures

Andresen, Simone; Bäger, Annette; Hamm, Christian

doi:10.1016/j.jsv.2019.115027

Cited by 21 publications

(10 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Different AM technologies used to fabricate complex structures are extrusion based fused deposition method (FDM), selective laser melting (SLM), selective laser sintering (SLS), stereolithography (SLA), etc. 20,22,[28][29][30][31][32] The current study aims to cover modeling, mechanical properties, and vibration methods of PCS and metamaterials along with theoretical works. Emphasis is given on metamaterials through explaining the damping enhancement by such materials in details.…”

Section: Referencementioning

confidence: 99%

See 1 more Smart Citation

Advances in mechanical metamaterials for vibration isolation: A review

Rifaie

Abdulhadi

Mian

2022

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The adverse effect of mechanical vibration is inevitable and can be observed in machine components either on the long- or short-term of machine life-span based on the severity of oscillation. This in turn motivates researchers to find solutions to the vibration and its harmful influences through developing and creating isolation structures. The isolation is of high importance in reducing and controlling the high-amplitude vibration. Over the years, porous materials have been explored for vibration damping and isolation. Due to the closed feature and the non-uniformity in the structure, the porous materials fail to predict the vibration energy absorption and the associated oscillation behavior, as well as other the mechanical properties. However, the advent of additive manufacturing technology opens more avenues for developing structures with a unique combination of open, uniform, and periodically distributed unit cells. These structures are called metamaterials, which are very useful in the real-life applications since they exhibit good competence for attenuating the oscillation waves and controlling the vibration behavior, along with offering good mechanical properties. This study provides a review of the fundamentals of vibration with an emphasis on the isolation structures, like the porous materials (PM) and mechanical metamaterials, specifically periodic cellular structures (PCS) or lattice cellular structure (LCS). An overview, modeling, mechanical properties, and vibration methods of each material are discussed. In this regard, thorough explanation for damping enhancement using metamaterials is provided. Besides, the paper presents separate sections to shed the light on single and 3D bandgap structures. This study also highlights the advantage of metamaterials over the porous ones, thereby showing the future of using the metamaterials as isolators. In addition, theoretical works and other aspects of metamaterials are illustrated. To this end, remarks are explained and farther studies are proposed for researchers as future investigations in the vibration field to cover the weaknesses and gaps left in the literature.

show abstract

Section: Referencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in mechanical metamaterials for vibration isolation: A review

Rifaie

Abdulhadi

Mian

2022

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Des Weiteren werden Zellen dahingehend ausgewählt und ausgelegt, dass sie möglichst große Bandbreiten an Schwingungen dämpfen, u. a. durch resonante Phononische Kristalle (PnC) [31] und Topologieoptimierung von Gitterstrukturen [32]. Eine weitere Möglichkeit, die Schwingungsabsorptionseigenschaften zu verbessern, sind eine gezielte Auslegung auf die Absorption von Eigenfrequenzen im System [33] und das Verschieben der Struktur-Eigenfrequenz in einen möglichst hohen Frequenzbereich [34,35].…”

Section: Schwingungenunclassified

“…Die Eigenfrequenz kann jedoch auch über die Elementarzelle beeinflusst werden. [27,34] Für die Auswahl und Gestaltung von Elementarzellen mit diesen spezifischen Eigenschaften gibt es beispielsweise Ansätze zur Verschachtelung von Einheitszellen, um deren Eigenschaften zu kombinieren [48,49]. Darüber hinaus gibt es Ansätze, die sich mit der automatisierten Generierung von Einheitszellen auf Basis neuronaler Netze beschäftigen, um gezielt Materialeigenschaften zu erreichen [50].…”

Section: Programmierbare Eigenschaftenunclassified

Potentiale additiv gefertigter Gitterstrukturen – ein Review

Schulte¹,

Weber²,

Reichwein³

et al. 2021

DS 111: Proceedings of the 32nd Symposium Design for X

View full text Add to dashboard Cite

“…Conversely, the dynamic behaviour of lattice structures has not been extensively studied yet. Andresen et al [27] applied an evolutionary strategic optimization to maximize the first eigenfrequency of SLM AlSi10Mg lattices, helping to prevent resonance phenomena. Rosa et al [28] demonstrated that SLM BCC lattices made of AISI 316L have better damping performances with respect to equivalent bulk reference specimens.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Experimental Setup on the Damping Properties of SLM Lattice Structures

2022

View full text Add to dashboard Cite

Background Metal lattice structures obtained through Selective Laser Melting may increase the strength-to-weight ratio of advanced 3D printed parts, as well as their damping properties. Recent experimental results showed that AlSi10Mg and AISI 316L lattices are characterized by higher Rayleigh damping coefficients with respect to the fully dense material. However, some unclear or contradictory results were found, depending on the experimental setup adopted for modal analysis. Objective In this work the influence of the experimental setup when performing modal analysis on different SLM AISI 316L lattice structures was deeply investigated. The study provides a critical comparison of various experimental modal analysis approaches, allowing to evaluate the influence of external damping sources and material internal damping phenomena. Methods The dynamic behaviour of SLM AISI 316L specimens incorporating lattice structures was estimated by means of pulse testing and sinusoidal excitation through an electromagnetic shaker. The validity of the viscous damping model was assessed by means of sinusoidal excitation with different levels of vibration velocity. Moreover, the influence of experimental setup on modal analysis results was critically evaluated, by considering different actuators, contact and non-contact sensors and boundary/clamping conditions. Results The classical viscous damping model describes with good approximation the damping properties of SLM lattice structures. When exciting single specimens in free-free conditions, those embedding lattice structure and unmelted metal powder filler were characterized by superior internal damping properties with respect to the specimens incorporating the lattice structure without any filler, which was however more effective than the full density equivalent material. Most of the other experimental setups introduced additional external damping sources, that could alter this important outcome. Conclusions SLM lattice structures embedded into 3D printed components provide superior damping properties against mechanical and acoustic vibrations and the metal powder filler does significantly enhance such damping capacity. A correct estimation of material internal damping was achieved by applying non-contact sensors and free-free boundary conditions, whereas other experimental setups were partly inadequate.

show abstract

Eigenfrequency maximisation by using irregular lattice structures

Cited by 21 publications

References 36 publications

Advances in mechanical metamaterials for vibration isolation: A review

Advances in mechanical metamaterials for vibration isolation: A review

Potentiale additiv gefertigter Gitterstrukturen – ein Review

Influence of the Experimental Setup on the Damping Properties of SLM Lattice Structures

Contact Info

Product

Resources

About