There are several applications of wireless electronic components with little or no ambient energy available to harvest, yet battery charging for such systems is still great interest. Example range from biomedical implants sensors located in hazardous environments. Energy transfer based on the propagation acoustic waves at ultrasonic frequencies a recently explored alternative that offers increased transmitter-receiver distance, reduced loss and elimination electromagnetic fields. As this...

Contactless powering of small electronic components has lately received growing attention for wireless applications in which battery replacement or tethered charging is undesired simply impossible, and ambient energy harvesting not a viable solution. As an alternative to well-studied methods contactless transfer, such as the inductive coupling method, use ultrasonic waves transmitted by piezoelectric devices enables larger power transmission distances, critical especially deep-implanted...

Contactless ultrasonic acoustic energy transfer (UAET) is a new technology that eliminates risks or impracticalities associated with wired electrical connections batteries need to be replaced on regular basis. This technology, which based the reception of waves at frequencies by piezoelectric receivers, can used wirelessly charge low-power electronics. The execution and efficiency this significantly enhanced through patterning focusing transmitted in space simultaneously power distributed...

Controlled drug delivery (CDD) technologies have received extensive attention recently.

Bio-inspired hydrodynamic thrust generation using smart materials has received growing attention over the past few years to enable improved maneuverability and agility, small form factor, reduced power consumption, ease of fabrication in next-generation aquatic swimmers. In order develop a high-fidelity model predict electrohydroelastic dynamics macro-fiber composite (MFC) piezoelectric structures, this work, mixing rules-based (i.e. rule mixtures) electroelastic mechanics formulation is...

Piezoelectric structures have been used in a variety of applications ranging from vibration control and sensing to morphing energy harvesting. In order employ the effective 33-mode piezoelectricity, interdigitated electrodes design macro-fiber composites which piezoelectric fibers with rectangular cross section. this article, we present an investigation two-way electroelastic coupling (in sense direct converse effects) bimorph cantilevers that for operation. A distributed-parameter modeling...

Acoustic holographic lenses, also known as acoustic holograms, can change the phase of a transmitted wavefront in order to shape and construct complex ultrasound pressure fields, often for focusing energy on target region. These lenses have been proposed transcranial focused (tFUS) create diffraction-limited focal zones that specific brain regions while compensating skull aberration. Holograms are currently designed using time-reversal approaches full-wave time-domain numerical simulations....

Abstract Vibration‐based energy harvesting for enabling next‐generation self‐powered devices is a rapidly growing research area. In real‐world applications, the ambient vibrational often available in non‐deterministic forms rather than extensively studied deterministic scenarios, such as simple harmonic excitation. It of interest to choose best piezoelectric material given random Here, performance comparisons various soft and hard ceramics single crystals are presented electrical power...

In recent years, shape-memory polymers (SMPs) have received extensive attention to be used as actuators in a broad range of applications such medical and robotic devices. Their ability recover large deformations their capability stimulated remotely made SMPs superior choice among different smart materials various applications. this study, ductile SMP composite with enhanced shape recovery is synthesized characterized. This by mixture acrylate-based crosslinkers monomers, well polystyrene...

This work proposes a vibrating mesh screen as an alternative to the static currently used in conventional flooded-bed dust scrubbers for removing airborne coal mine continuous mining environment. Fundamental assessments suggest that may improve collection efficiency of scrubber systems and mitigate clogging issues associated with design. To evaluate this hypothesis, computational fluid dynamics (CFD) simulations were carried out assess effects vibration conditions (i.e., frequency amplitude)...

Abstract High-intensity focused ultrasound (HIFU) has been investigated as a remote and controlled activation method to noninvasively actuate shape memory polymers (SMPs), specifically in biomedical applications. However, the effects of aqueous environment on recoverability vivo HIFU-actuated SMPs have yet be explored. HIFU directs sound waves into millimeter-sized tightly region. In this study, response hydrophilic hydrophobic photopolymerized thermoset SMP networks under an was...

Abstract Acoustic holographic lenses (AHLs) show great potential as a straightforward, inexpensive, and reliable method of sound manipulation. These store the phase amplitude profile desired wavefront when illuminated by single acoustic source to reconstruct ultrasound pressure fields, induce localized heating, achieve temporal spatial thermal effects in acousto-thermal materials like polymers. The ultrasonic energy is transmitted focused AHL from transducer into particular focal volume. It...

The acoustic impedance mismatch between transducer materials and medium in ultrasonic power transfer systems narrows the transduction bandwidth causes losses through back reflection of progressive pressure waves at boundary transducers medium. Capturing both resonances due to interwoven elements is essential for advancing development these systems. We present a unified approach, based on multiplication sequence matrices, determine an equivalent impedance. analytical model couples properties...

An optimization strategy is presented for modifying the dynamic characteristics of functionally graded material (FGM) plates which are actively controlled by piezoelectric sensor/actuator (S/A) pairs. A finite element (FE) model developed static and analysis FGM with collocated sensors actuators. In this model, feedback signal to each actuator patch implemented as a function electric potential in its corresponding sensor order provide active control plate closed loop system. Using proposed...

Experiments show that high-intensity focused ultrasound (HIFU) is a promising stimulus with multiple superior and unique capabilities to induce localized heating achieve temporal spatial thermal effects in the polymers, noninvasively. When polymers are subjected HIFU, they heat up differently compared case sources directly; however, origins of this difference still entirely unknown. We hypothesize macroscale response HIFU strongly depends on polymer chains, composition, structure, i.e. being...

Abstract Locomotion is a critically important topic for soft actuators and robotics, however, the locomotion applications based on two-way shape memory polymers (SMPs) have not been well explored so far. In this work, crosslinked poly(ethylene-co-vinyl acetate) (cPEVA)-based SMP synthesized using dicumyl peroxide (DCP) as crosslinker. The influence of DCP concentration mechanical properties systematically studied. A Venus flytrap-inspired actuator made by cPEVA, it shown that can efficiently...

Abstract In this paper, a new method for computing eigenvalue and eigenvector derivatives of asymmetric non‐conservative systems with distinct eigenvalues is presented. Several approaches have been proposed eigenderivative analysis non‐positive‐definite mass, damping stiffness matrices. The formulation that developed by combining the modal algebraic methods neither complications in calculating complex left right nor suffer from numerical instability problems usually associated methods....

Many biomedical applications such as ultrasonic targeted drug delivery, gene therapy, and molecular imaging entail the problems of manipulating microbubbles by means a high-intensity focused ultrasound (HIFU) pressure field; namely stable cavitation. In acoustic field, bubbles demonstrate translational instability, well-known erratic dancing motion, which is caused shape oscillations that are excited their volume oscillations. The literature bubble dynamics in HIFU field mainly centered on...