A5024996300- Vibration Control and Rheological Fluids
- Innovative Energy Harvesting Technologies
- Advanced Materials and Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Acoustic Wave Phenomena Research
- Modular Robots and Swarm Intelligence
- Structural Analysis and Optimization
- Energy Harvesting in Wireless Networks
- Structural Health Monitoring Techniques
- Vibration and Dynamic Analysis
- Cellular and Composite Structures
- Mechanical and Optical Resonators
- Bladed Disk Vibration Dynamics
- Structural Engineering and Vibration Analysis
- Micro and Nano Robotics
- Structural Response to Dynamic Loads
- Probabilistic and Robust Engineering Design
- Cellular Mechanics and Interactions
- Seismic Performance and Analysis
- stochastic dynamics and bifurcation
- Nonlinear Dynamics and Pattern Formation
- Music Technology and Sound Studies
- Tactile and Sensory Interactions
- Force Microscopy Techniques and Applications
- Biomimetic flight and propulsion mechanisms
Pennsylvania State University
2021-2025
California State University, Long Beach
2022
The Ohio State University
2015-2020
University of Michigan
2012-2015
Michigan United
2013-2015
Virginia Tech
2010-2013
Abstract Integrated circuits utilize networked logic gates to compute Boolean operations that are the foundation of modern computation and electronics. With emergence flexible electronic materials devices, an opportunity exists formulate digital from compliant, conductive materials. Here, we introduce a general method leveraging cellular, mechanical metamaterials composed polymers realize all gate assemblies. We establish for applying polymer networks metamaterial constituents correlate...
By synthesizing the requisite functionalities of intelligence in an integrated material system, it may become possible to animate otherwise inanimate matter. A significant challenge this vision is continually sense, process, and memorize information a decentralized way. Here, we introduce approach that enables all such soft mechanical system. integrating nonvolatile memory with continuous processing, develop sequential logic-based design framework. Soft, conductive networks interconnect...
We employ an analytical model of a harmonically excited bistable vibration energy harvester to determine criteria governing continuous high-energy orbit (HEO) dynamics that maximize harvesting performance. Derivation the stems from previously unexplored dynamic relationships predicted by indicating critical conditions for HEO; experimental evidence phenomenon is provided as validation. The are vastly more concise than existing HEO prediction methodology and can accurately delineate...
In this research we study the dynamics of a coupled linear oscillator-bistable energy harvester system. The method harmonic balance and perturbation analysis are used to predict existence stability bistable device interwell vibration. influences important parameters on tailoring system response investigated determine strategies for improved harvesting performance. We demonstrate analytically that excitation frequencies in bandwidth less than natural frequency uncoupled oscillator having net...
Recent work has indicated that linear vibrational energy harvesters with an appended degree-of-freedom (DOF) may be advantageous for introducing new dynamic forms to extend the operational bandwidth. Given additional interest in bistable harvester designs, which exhibit a propitious snap through effect from one stable state other, it is logical extension explore influence of added DOF system. However, not resonant phenomenon, tempers presumption dynamics induced by on designs would...
Abstract This is a roadmap article with multiple contributors on different aspects of embodying intelligence and computing in the mechanical domain functional materials structures. Overall, an IOP broad, multi-author review leaders field discussing latest developments, commissioned by editorial board. The intention here to cover various topics adaptive structural material systems mechano-intelligence overall roadmap, twelve sections total. These from devices systems, such as computational...
Recently, there has been an increased interest in endowing intelligent behaviors and features soft robotic systems. As a prerequisite for intelligence, system must integrate sensing, information processing, the ability to act response external stimuli. This work presents crawler that demonstrates locomotion using electroactive liquid crystal elastomers (LCEs). By integrating independent components such as photo-responsive LCE switch into conductive electromechanical processing network based...
Superharmonic dynamics are characteristic of many nonlinear systems undergoing high levels excitation. However, what constitutes is relative to the system under study. For instance, bistable oscillators may have very low linearized natural frequency which often becomes a normalization parameter for excitation in analysis. Thus, be common operating condition oscillators. Recent experimental energy harvesting investigations using devices (referred as harvesting) observed superharmonic spectral...
Recent studies on periodic metamaterial systems have shown that remarkable properties adaptivity and versatility are often the products of exploiting internal, coexisting metastable states. Motivated by this concept, research develops explores a local-global design framework wherein macroscopic system-level sought according to strategic constituent composition assembly. To end taking inspiration from recent insights in multiphase composite materials cytoskeletal actin networks, study...
Fixed in spatial distribution, arrays of planar, electromechanical acoustic transducers cannot adapt their wave energy focusing abilities unless each transducer is externally controlled, creating challenges for the implementation and portability such beamforming systems. Recently, origami-based structural tessellations are found to facilitate great versatility system function properties through kinematic folding. In this research we bridge physics acoustics design discover that simple...
This article reports means to significantly enhance the adaptation of static and dynamic properties using magnetorheological elastomers demonstrates enhancements experimentally. The tunability traditional is limited by magnetic field strength intrinsic magnetic–elastic coupling. contrasts with recent efforts that have revealed large change in elastomeric metamaterials via exploiting internal void architectures collapse mechanisms, although design guidelines not been developed adapt...
We present a new class of reconfigurable origami-based antennas formed by embroidered conductive E-threads. State-of-the-art techniques used to realize origami employ fragile inks and/or copper tape. By contrast, the proposed approach brings forward enhanced robustness and durability as attributed inherent strength To facilitate folding along creases while also providing radio frequency (RF) performance close that copper, graded embroidery process is proposed. The grading scheme uses density...
Ambient vibration sources in many prime energy harvesting applications are characterized as having stochastic response with spectra concentrated at low frequencies and steadily reduced power density frequency increases (colored noise). To overcome challenges designing linear resonant systems for such inputs, nonlinear restoring potential shaping has become a popular means of extending harvester's bandwidth downward towards the highest concentration excitation available. Due to recent works...
One approach to vibration control is apply a force primary structure that opposes the excitation, effectively canceling external disturbance. A familiar passive example of this linear-tuned mass absorber. In spirit, utility bistable attachment for attenuating vibrations, especially in terms high-orbit, snap-through dynamic, investigated using harmonic balance method and experiments. Analyses demonstrate fundamental having commensurate frequency with single-frequency may generate adverse...
Conversion of ambient vibrational energy into electric power has been the impetus much modern research. The traditional analysis focused on absolute electrical output from harvesting devices and efficiency defined as convertibility an infinite resource vibration excitation power. This perspective limited extensibility when applying resonant harvesters to host structures inertial influence harvester is more significant. Instead, this work pursues a fundamental understanding coupled dynamics...
This study explores the steady-state performance of a dual-stage vibration isolator, which is configured by bistable oscillator and linear oscillator. The potential force stage comprises negative positive cubic nonlinear stiffnesses such that two restoring contributions may counterbalance to minimize dynamic transmission. By applying first-order harmonic balance, it predicted isolator significantly outperform an equivalent pure isolator. conclusion verified through series numerical...