To enhance the flow rate of a valveless piezoelectric pump and improve stability fluid flow, with streamlined chamber fishtail-type bluff body (VPFB) is proposed. Compared traditional conical chamber, reduces generation eddy currents energy loss, increasing output efficiency pump. On other hand, increases resistance when flows in reverse direction, reducing backflow. First, three-dimensional model VPFB designed theoretically analyzed based on inverse effect dynamics to derive expression...

In order to solve the problem of conventional energy shortages, a non-resonant impact piezoelectric capture device using (polyvinylidene fluoride) film at low frequency is proposed, and related theoretical analysis experimental studies are conducted. The has simple internal structure, green easy miniaturize, capable harvesting frequencies supply micro small electronic devices. First, verify feasibility device, structure modeled dynamically analyzed. Then modal, stress–strain, output voltage...

In the field of controlled drug delivery system, there are still many problems on those reported micro-valves, such as small opening height, unsatisfactory particle tolerance and high cost. To solve above problems, a novel normally-closed piezoelectric micro-valve is presented in this paper. The was driven by circular unimorph vibrator natural rubber membrane with elasticity used valve stopper. axial displacement can be converted into large stroke stopper based hydraulic amplification...

In order to solve the problem of limited driving speed piezoelectric actuators when components are small and frequency is low. This paper proposes a bi-directional stick-slip actuator, which mainly utilizes combination flexible drive foot lever amplification mechanism realize displacement function, thus improving performance. Firstly describe structure working principle proposed carries out theoretical analysis mathematical modeling stator. Then process actuator simulated analyzed with...

A piezoelectric vibration feeder with a magnetic spring is discussed in this paper. The can keep resonance frequency relatively stable under changing loading. Through the analysis on working principle and stiffness characteristic of feeder, dynamic model was established relationship among system frequency, loading obtained. showed that, as changed, changed accordingly, which maintained trend stability frequency. prototype made for experiment, loading, axial clearance result when changes,...

Achieving broadband energy harvesting at low frequencies is a difficult area of research today. To solve the aforementioned problems, herein, nonlinear sickle‐shaped cantilever beam piezoelectric harvester (S‐PEH) for wind proposed. It has high‐voltage output in speed range 5.37–18.23 m s −1 . The S‐PEH consists collector and transducer. converts into rotating mechanical excites transducer by means magnetic coupling, thus realizing conversion to electrical energy. special structure...

The crest factor is an important indicator to measure the performance of load. To reduce system and improve internal stability circuit, this article proposes a novel direct‐current piezoelectric energy harvester with sustainable output (S‐PEH). Voltage superposition phase coupling could significantly circuit interference damage transient pulses system. Here, influence angle size number on S‐PEH studied. produce more stable voltage low through coupling. At 3 P 120°, optimum MAX root mean...

In order to solve the problem of ineffective utilization waste heat generated by energy consumption in industrial production and life, a low-frequency thermal conversion type piezoelectric trap is proposed, relevant theoretical analysis experimental research are conducted. The device utilizes film (polyvinylidene fluoride) combined with shape memory alloy features simple green structure that can supply microelectronic devices. First, structural design working principle analyzed dynamics...

In order to realize the bidirectional transportation of materials, a reciprocating double track linear conveyor is designed in this paper.The conveyer uses piezoelectric vibrator as its driving force source drive and structure spiral conveying function.Conveyors have capability convey materials with small volume.Firstly, introduced.Then, modal analysis simulation system are carried out.We find out that worked under two-order mode obtained working principle system.Finally, make prototype test...

The large load loss of piezoelectricity pumps leads to fluid energy in the chamber during transportation. In this paper, output performance a pump is improved by changing structure parameters reduce load. mechanism flow body cavity hydraulic simulated and analyzed, influence dimensions inlet outlet valves height on obtained. rate pressure with different heights driving frequencies are results show that optimized when 3 mm, valve diameters 2.5 mm.

To solve the problem of small deformation piezoelectric vibrators and improve overall performance micro-pumps, a flexible-diaphragm micropump is designed based on hydraulic amplification. The uses vibrator to provide its driving force, fluid delivered by liquid amplify displacement vibrator. First, working principle analyzed, then theoretical analysis output tests amplifier unit are carried out. test results consistent with those analysis, amplification factor 3.29. Finally, prototypes...

This paper describes the design of a piezoelectric-driven hydraulically amplified Braille-flexible bump device that enables flexible formation Braille characters. A piezoelectric vibrator is used to excite fluid resonance in cavity, and displacement realized by compressing fluid, allowing character dots be formed. First, structural working principle device, as well method drive are explained. Expressions for output amplification ratio film then obtained through kinetic analysis system unit....

Ultra-wideband antennas that operate at low frequencies usually have a large geometry, which makes them very limited in practical engineering application environment where space is often constrained. In this paper, novel low-frequency low-profile ultra-wideband magneto-electric (ME) dipole antenna designed for the ground penetrating radar (GPR) to detect deeply buried targets. The operation frequency of 230 MHz, so objects are as deep 1.5 m can be detected. Compared traditional _antennas, it...

In order to solve the displacement regression phenomenon of piezoelectric viscous-slip actuators, this paper proposes a lever-type flexible hinge mechanism that uses two sets stacks move slider in both directions and efficiently suppress phenomenon. First, overall dimensional parameters drive are designed, device is modeled using 3D software, driving principle analyzed. Then theoretical model built based on lever amplification derive relevant expressions for viscous slip actuator under...

With the popularization of integrated circuits, MEMS, and portable electronic devices, chemical batteries have many disadvantages as main energy supply method, such large size, high quality, limited life, requiring regular replacement, resulting in waste materials, environmental pollution, other issues. From above reasons, harvesting technology plays an important role improving efficiency life equipment. In order to explore influence bimorph piezoelectric vibrator’s structural parameters on...

Since the piezoelectric energy harvester will generate strain zero point when it is bent, affect power generation effect. In this paper, of cantilever beam rectangular studied through theoretical analysis. The main analysis specific location in first-, second-, and third-order modes capturer. results are verified by experimenting with different segmentation methods harvesters. experimental show that segmented at 0.275 length direction ceramic second-order mode, output 5 times nonsegmented...

The present study reports the design and testing of a novel piezoelectric pneumatic actuator with circular double-chip oscillator as driving source to improve precision control accuracy micromechanical pressure. First, theoretical simulation analyses gas in system were conducted, variation curves output thrust speed frequency generated. Accordingly, prototype was constructed tested at resonance 607.677Hz. results revealed that optimum loading pressure 0.04MPa, maximum force was87.14,which is...

Water energy is a usable and recyclable source with high potential for powering electronic devices has received much attention. In this study, new low frequency non-contact magnetically coupled water piezoelectric harvester (L-PEH) proposed. the L-PEH mainly consists of base, rocker, magnet, two patches drift. The effect different magnet spacing drift radius on output voltage was investigated in experiment. tests studies were carried out range flow rate from 4×10 3 L/h to 2×10 4 L/h. maximum...