This paper presents the design and verification of a piezoelectric energy harvester with compound two-stage force amplification frame compact footprint size to achieve high power output for stack. An improved conventional bridge-type is proposed beam, which able maintain large ratio while bearing loading force. Analytical model developed based on Euler-Bernoulli beam theory predict amplifier. The architectural parameters are optimally tuned largest ratio, so as obtain maximum stack under...

This paper proposes a novel integrated multistage energy harvester to scavenge the mechanical from human footstep during walking. The device involves four-stage force amplification using wedge mechanism, leverage half-bridge and bridge-type amplifier. It is devised magnify input exerted on piezoelectric stack so as enhance power output. By fully exploiting characteristics of frame, also provides function position protection, which enables bearing large load thereby protecting stack. this,...

The battery pack in electric vehicles is subjected to road-induced vibration and this one of the potential causes failure, especially once frequency close natural when resonance occurs cells. If occurs, it may cause notable structural damage deformation cells pack. In study, frequencies mode shapes a commercial pouch lithium-ion (LIB) are investigated experimentally using laser scanning vibrometer, effects supporting methods presented. For purpose, test setup hold LIB on shaker designed. A...

This article presents the design and testing of a novel two-directional (2-D) piezoelectric stack-based energy harvester for capturing mechanical from human footstep. The uniqueness lies in fact that 2-D excitation is scavenged by single stack transducer, which can reduce loss harvestable energy. constructed integration permanent magnets, position protection plates, multistage force amplification frame. input displacement are restricted to guarantee device's safety. reported frame with...

As alternative power sources for replacing batteries, piezoelectric energy harvesters are designed the applications which demand low-power electronics and sustainable electrical power. This paper presents design of a new harvester with two-stage force amplification frame purpose harvesting from human footstep. The can magnify walking applied to stack thereby enhances output. Analytical model is established obtain relationship between input output based on elastic beam theory. parameters...

This paper proposes the design of a novel piezoelectric energy harvester for scavenging mechanical excited by human footstep during walking. The device involves four-stage force amplification using wedge mechanism, leverage half-bridge and bridge-type amplifier. It is designed to magnify input exerted on stack so as enhance power output. Analytical model established via analysis based stiffness matrix method. main architectural parameters are optimized adopting multi-objective genetic...

In this paper, the design and testing of a micro-syringe pump is carried out for precision delivery liquid inside tiny tube. A single-axis micro-motion designed by using flexure mechanisms drive micro-syringe. Based on required specifications travel range load capability, compliant translational motion mechanism developed. The machine parameters are optimized to cater requirement performance. performance verified conducting finite element analysis (FEA) simulations. prototype actuated...

During the COVID-19 pandemic, negative-pressure isolation wards (NPIWs) became a crucial infrastructure for treating patients and safeguarding healthcare workers (HCWs). However, standard requirements full fresh air high changes per hour (ACH) make NPIWs extremely energy-intensive. The blind ventilation design of also poses potential exposure risks HCWs. To address these issues, portable cleaners (PACs) have been proven effective in removing bioaerosols from air, providing clean delivery...

Energy harvesting refers to the process of acquiring surrounding energy and converting it into electrical energy. In this paper, a novel wind harvester is designed developed based on mechanical mechanism design with piezoelectric materials attached onto cantilever beam. It harvest from magnets interaction-induced vibration. The influences different beams magnetic field performances have been analyzed by finite element analysis simulation. Different flabellum piezoceramic compared selected....

The existing flowmeters must cooperate with other equipment to achieve regulation. Many scholars have proposed the integration of measurement and control, using torque dampers measure control flow. However, whether monitoring accuracy is affected by local components still needs be investigated. Therefore, this paper uses numerical simulation analyze has an impact on traditional damper. research shows that coupling effect can produce large errors. also proposes a novel damper eliminate effect.

Compared with sensible heat energy storage, latent thermal storage system (LHTES) has higher density. However, the low conductivity of PCM is a major obstacle to achieving more efficient LHTES technology. Therefore, this study uses numerical simulation evaluate effectiveness five enhanced transfer methods for LHTESs, aiming guide selection future methods. Results show that reducing pipe diameter, increasing temperature difference and adding fins can significantly enhance transfer. Pipe...

The heat transfer rate of the coupled system combined by a passive residual removal (PRHRS) and latent thermal energy storage (LHTES) is directly related to worker safety in nuclear power plants. To enhance performance system, this study, melting process phase change material (PCM) LHTES numerically investigated inserting innovative harpoon-type fins. A new assessment index also proposed evaluate comprehensive More than thirty cases with different fins designed, impacts various efficient...