We present a novel design of honeycomb lattice geometry that uses seamless combination conventional and auxetic cores, i.e. elements showing positive negative Poisson's ratio. The is aimed at tuning improving the band structure periodic cellular structures. proposed configurations show significantly wide gap much lower frequencies compared to their pure counterparts, while still retaining major dynamic features. Different topologies involving both inclusions in conversely hexagonal butterfly...

Abstract With the recent emergence of wavelet‐based procedures for stochastic analyses linear and non‐linear structural systems subjected to earthquake ground motions, it has become necessary that seismic motion processes are characterized through statistical functionals wavelet coefficients. While direct characterization in terms site parameters may have wait a few more years due complexity problem, this study attempts such commonly available Fourier response spectra design motions. Two...

This paper presents a novel methodology of calculating an object's frequency vibration autonomously using camera and mechanism optical strobing. The used has frame rate 30 fps therefore, in the conventional fashion, it is unable to capture meaningful information about any higher than that. Therefore, we utilize strobing concept with illumination modulo (of division) between captured video. Motion video tracked robust flow technique. Finally, calculated from plot strobe. Experimental results...

Vibration analysis is a key troubleshooting methodology for assessing the health of factory machinery. We propose an unobtrusive framework at-a-distance visual estimation such (possibly high frequency) vibrations, using low fps (frames-per-second) camera that may, example, be mounted on worker's smart-glass. Our innovation to use external stroboscopic light source (that, may provided by assistive robot), illuminate machine with multiple mutually-prime strobing frequencies, and resulting...

A spectrally formulated finite element analysis based methodology has been proposed to calculate phononic band structure of reticulated honeycomb lattices having translationally invariant repetitive elements called unit cells. Bloch formulation captures dynamics infinite through that a cell. While conventional FEM is generally used for analyzing such systems, here, constituent structural members are treated as 1D waveguide and modeled Timoshenko beam frame element, enabling application...

In this paper, we intend to demonstrate a novel system measure the high-speed vibration of an anonymous vibrating object using COTS camera and optical strobing. The whole process is unobtrusive frugal, can be used in machine inspection. has frame rate 30 frames per second (fps), so conventional fashion, it incapable detain significant information about any frequency which not range Nyquist theory (within ±15 Hz). We have solved challenge strobing phenomena for capturing modulo (of division)...

A novel design for the geometric configuration of honeycombs using a seamless combination auxetic and conventional cores-elements with negative positive Possion ratios respectively, has been presented. The proposed shown to generate superior band gap property while retaining all major advantages purely or honeycomb structure. Seamless ensures that joint cardinality is also retained. Several configurations involving different degree auxeticity proportions elements have analyzed. It preferred...

The class of fabricated materials known as metamaterials, with its promises for unconventional material properties or characteristics, has opened up a whole new paradigm possibilities and challenges. primary enablers have been capabilities at the very low length scale novel design configurations. Pentamode having fluid like properties, is one such idea to realized in recent past. This type show high bulk modulus but shear modulus. fundamental constituent element rod structure tapered down on...

A wave propagation based approach for the detection of damage in components structures having periodic has been proposed. Periodic pattern may arise a structure due to periodicity geometry and loading. The method exploits Block-Floquet band formation mechanism , feature specific with periodicity, identify bands (pass bands) attenuation (stop at different frequency ranges. presence modifies behaviour forming these bands. With proper positioning sensors force indicator (DFI) can be used locate...

Phononic crystals are synthetic materials with a periodic structure having spatial variations of elasto-inertial properties constituent materials, aimed at developing devices and bulk material engineered acoustic/ elastic properties. Multi-material structures sides space filling polygonal tessellation, can constitute solid-solid phononic crystal. Coupled inclusions features, show rich varied band phenomenon. We use frequency domain spectral superelement method Bloch theory to efficiently...

Grapahene is a two dimensional allotrope of carbon. Since the onset current century, particularly, upon successful exfoliation single layer graphene, it has received significant research attention because some extreme mechanical, thermal, electromagnetic and optical properties exhibits. As various applications graphene have been envisioned their realizations attempted, dynamic characteristics also became an extremely important field study. Based on solid state physics first principle...