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Wave propagation in tunable lightweight tensegrity metastructure.

Y T Wang1, X N Liu1, R Zhu2

  • 1Key Laboratory of Dynamics and Control of Flight Vehicle, Ministry of Education, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Scientific Reports
|August 2, 2018
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Summary
This summary is machine-generated.

New lightweight tensegrity metastructures offer excellent strength-to-weight ratios and tunable vibration damping. These structures demonstrate broadband wave attenuation, making them ideal for advanced engineering applications requiring robust performance.

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Area of Science:

  • Mechanics of Materials
  • Metamaterials Engineering
  • Structural Dynamics

Background:

  • Lightweight structures with high strength-to-weight ratios are crucial for many engineering applications.
  • Tensegrity structures offer unique mechanical properties, including inherent stability and adaptability.
  • Metamaterials provide opportunities to engineer novel dynamic and static properties beyond conventional materials.

Purpose of the Study:

  • To design and theoretically model lightweight metastructures using prismatic tensegrity building blocks.
  • To investigate the band structures and wave attenuation capabilities of these novel metastructures.
  • To explore the tunability of stiffness and band structure through geometric nonlinearity and prestress adjustment.

Main Methods:

  • Development of a theoretical model for coupled axial-torsional stiffness analysis.
  • Investigation of various unit cell designs for bandgap generation.
  • Harnessing geometrically nonlinear deformation for tunable stiffness ('small-on-large').
  • Frequency response testing of finite tensegrity metastructures.

Main Results:

  • Demonstrated excellent strength-to-weight ratio and compression-torsion coupling in tensegrity metastructures.
  • Achieved broadband full-wave attenuation, particularly in opposite-chirality designs.
  • Successfully implemented tunable stiffness and fine-tuned band structures via prestress adjustment.
  • Validated wave attenuation and tunability through experimental frequency response tests.

Conclusions:

  • Prismatic tensegrity metastructures offer significant potential for vibration suspension and wave attenuation.
  • The demonstrated tunability and broadband performance are highly valuable for advanced engineering applications.
  • These metastructures represent a promising new class of engineered materials for dynamic control.