Phononic Bandgap Optimization in Sandwich Panels Using Cellular Truss Cores.

Area of Science:

• Materials Science
• Mechanical Engineering
• Acoustics

Background:

• Additive manufacturing and topological optimization enable complex cellular materials.
• Truss-like cellular structures offer high strength-to-mass ratios and unique vibration properties.
• Phononic bandgaps in cellular structures can control mechanical wave propagation.

Purpose of the Study:

• To develop a methodology for optimizing sandwich panel topology using cellular truss cores.
• To maximize the phononic bandgap of these structures for enhanced vibration absorption.
• To design lightweight composite panels with superior vibration damping capabilities.

Main Methods:

• Topology optimization of sandwich panels with cellular truss cores.
• Maximizing phononic bandgaps by varying material and geometric properties.
• Utilizing smooth approximations and the method of moving asymptotes for optimization.

Main Results:

• A feasible methodology for designing sandwich panels with large phononic bandgaps was established.
• Optimization successfully enhanced vibration absorption properties.
• The study demonstrated the potential of cellular truss cores in advanced material design.

Conclusions:

• Optimized cellular truss cores are effective for creating sandwich panels with significant phononic bandgaps.
• This approach facilitates the development of lightweight, vibration-dampening materials.
• Applications include aerospace, automotive, and marine industries.