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a. Shock Wave Manipulation

Shock & Vibration Control

home > Research > Shock & Vibration Control > a. Shock Wave Manipulation
a. Shock Wave Manipulation

Principal Investigator : Jae-Hung Han (SSHS), Dae-Hyun Hwang (SSHS)
Participating Graduate Research Assistants:  Hyun-Su Park (SSHS)

Summary:

Shock & Vibration group in the SSHS Lab. is trying to manipulate elastic wave in space structures. Main approaches for manipulation are analytical study based on the finite element method and experimental verifications. Using manipulating components such as nonhomogeneous material, complex geometry and repeated patterns, characteristics of elastic wave propagation will be argued. Based on the verified methods, design of elastic wave manipulating structures for shock attenuation will be achieved. Expected applications are shock attenuation, wave guiding and impact mitigation in various industrial fields.

Related Recent Publication:

[1] Hwang, D.-H, Park, H.-S., and Han, J.-H., “Experimental and numerical study on shock reduction on thin plate with elastic patch”, SPIE Smart Structures + Nondestructive Evaluation 2020, Apr. 27-May. 01, 2020

[2] Hwang, D.-H, Park, H.-S., and Han, J.-H., "Shock Reduction Technique on Thin Plate Structure by Wave Refraction Using an Elastic Patch," Shock and Vibration, vol. 2021, Article ID 6836899, 14 pages, 2021.

Shock wave Manipulation

1.Goals

  • Development of elastic wave manipulating structure for shock attenuation

2. Approaches

  • Analytical modeling of elastic wave manipulating components
  • Experimental verification of novel design of manipulating structures

3. Research Achievements

  • Mathematical argument on refraction of bending waves
  • Numerical simulation on bending wave reduction using the elastic patch

Fig. 1 A schematic diagram of the FE analysis model

Fig. 2 Maximum acceleration field from numerical simulation for the each patch: (a) triangle, (b) circle, and (c) double-convex

  • Shock Reduction Technique on Thin Plate Structure by Wave Refraction Using an Elastic Patch (On-going)

Fig. 3 Experimentally measured Normalized root mean square value of wavefield for (a) triangle, (b) circle, and (c) DCX-lens-shaped patch

  • Study on elastic wave propagation in origami-based metamaterials (On-going)

Fig. 4 Origami-based mechanical metamaterials for manipulating component

Elastic wave proapgation in origami chain