scholarly journals Design and Optimization Principles of Cylindrical Sliding Triboelectric Nanogenerators

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 567
Author(s):  
Zhike Xia ◽  
Pei-Yong Feng ◽  
Xin Jing ◽  
Heng Li ◽  
Hao-Yang Mi ◽  
...  
Keyword(s):  
Vibration Frequency ◽  
Sliding Mode ◽  
Energy Conversion Efficiency ◽  
Relative Displacement ◽  
Aluminum Film ◽  
Energy Output ◽  
Reciprocating Motion ◽  
Ptfe Film ◽  
Design And Optimization ◽  
Triboelectric Nanogenerators

Reciprocating motion is a widely existing form of mechanical motion in the natural environment. Triboelectric nanogenerators (TENGs) that work in sliding mode are ideal for harnessing large-distance reciprocating motion, and their energy conversion efficiency could be greatly enhanced by adding springs to them. Herein, we focused on investigating the design and optimization principles of sliding mode TENGs by analyzing the effects of spring parameters and vibration frequency on the triboelectric output performance of typical cylindrical sliding TENGs (CS-TENGs). Experimental study and finite elemental analysis were carried out based on a CS-TENG model assembled using a polytetrafluoroethylene (PTFE) film as the negative layer and an aluminum film as the positive layer. The energy output was found to be mainly affected by the change of relative displacement between the two friction layers, rather than the reactive force applied by the springs or the velocity of the sliding motion. However, the frequency of the output signals could be improved when the stiffness coefficient of the springs and the CS-TENG vibration frequency were increased. This study provides valuable directions for the design and optimization of sliding mode TENGs containing springs, and will motivate in-depth research on the fundamental principles of TENG operation.

Finite Element and Modal Analysis of Key Components of Horizontal Vibrating Centrifuge

2012 ◽  
Vol 619 ◽  
pp. 365-369
Author(s):  
Lan Zhu Ren ◽  
Lin Lin Zeng ◽  
Xin Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Vibration Frequency ◽  
Element Model ◽  
Relative Displacement ◽  
Vibration Modes ◽  
Reciprocating Motion ◽  
Level 1 ◽  
Two Bodies

This article analyzed the finite element on horizontal centrifuge of VM1400, established finite element model of the corresponding parts and gave the vibration modes of the various movements. Through the stress, strain, displacement calculation and modal analysis of the various components, the conclusions include that the level 1 of the vibrating body and the secondary vibrating body do the regular axial horizontal linear reciprocating motion, there is relative displacement between the two bodies, and the vibration frequency is close to the operating frequency.

Sliding Mode Direct Current Triboelectric Nanogenerators

Nano Energy ◽  
2021 ◽  
pp. 106531
Author(s):  
Wei-Zhi Song ◽  
Hui-Jing Qiu ◽  
Jun Zhang ◽  
Miao Yu ◽  
Seeram Ramakrishna ◽  
...  
Keyword(s):  
Direct Current ◽  
Sliding Mode ◽  
Triboelectric Nanogenerators

Integrated 3D Ionic Electrets Electronic Skin (e-Skin) For Harvesting of TENG Energy Through Push-Pull 3D Ionic Electrets and Ion-ion Hopping Mechanism

2021 ◽  
Author(s):  
Ravi Kumar Cheedarala ◽  
Jung Il Song
Keyword(s):  
Energy Demand ◽  
Dip Coating ◽  
Polymeric Membrane ◽  
Dynamic Interactions ◽  
Ptfe Film ◽  
Hopping Mechanism ◽  
Sulfonated Polyimide ◽  
Coating Method ◽  
Triboelectric Nanogenerators ◽  
Dip Coating Method

Abstract The development of highly durable, stretchable, and steady triboelectric nanogenerators (TENGs) is highly desirable to satisfy the tight requirement of energy demand. Here, we presented a novel integrated polymeric membrane that is designed by PEDOT:PSSa-naphthalene sulfonated polyimide (PPNSP)-EMI. BF4 Electronic skin (e-skin) for potential TENG applications. The proposed TENG e-skin is fabricated by an interconnected architecture with push-pull 3D ionic electrets that can threshold the transfer of charges through an ion-hopping mechanism for the generation of a higher output voltage (Voc) and currents (Jsc) against an electronegative PTFE film. PPNSP was synthesized from the condensation of naphthalene-tetracarboxylic dianhydride, 2, 2’-benzidine sulfonic acid, and 4,4’diaminodiphenyl ether through an addition copolymerization protocol, and PEDOT:PSSa was subsequently deposited using the dip-coating method. Porous networked PPNSP e-skin with continuous ion transport nano-channels is synthesized by introducing simple and strong molecular push-pull 3D interactions via intrinsic ions. In addition, EMI. BF4 ionic liquid (IL) is doped inside the PPNSP skin to interexchange ions to enhance the potential window for higher output Voc and Iscs. In this article, we investigated the push-pull dynamic interactions between PPNSP-EMI.BF4 e-skin and PTFE and tolerable output performance. The novel PPNSP- EMI.BF4 e-skin TENG produced upto 49.1 V and 1.03 µA at 1 Hz, 74 V and 1.45 µA at 2 Hz, 122.3 V and 2.21 µA at 3 Hz and 171 V and 3.6 µA at 4 Hz, and 195 V and 4.43 µA at 5 Hz, respectively. The proposed novel TENG device was shown to be highly flexible, highly durable, commercially viable, and a prospective candidate to produce higher electrical charge outputs at various applied frequencies.

scholarly journals Numerical Simulation and Design of Multi-Tower Concentrated Solar Power Fields

2020 ◽  
Vol 12 (6) ◽  
pp. 2402
Author(s):  
Zaharaddeen Ali Hussaini ◽  
Peter King ◽  
Chris Sansom
Keyword(s):  
Solar Power ◽  
Field Configuration ◽  
Energy Output ◽  
Concentrated Solar Power ◽  
Optical Efficiency ◽  
Study Region ◽  
Design And Optimization ◽  
Total Plant ◽  
Levelized Cost Of Heat

In power tower systems, the heliostat field is one of the essential subsystems in the plant due to its significant contribution to the plant’s overall power losses and total plant investment cost. The design and optimization of the heliostat field is hence an active area of research, with new field improvement processes and configurations being actively investigated. In this paper, a different configuration of a multi-tower field is explored. This involves adding an auxiliary tower to the field of a conventional power tower Concentrated Solar Power (CSP) system. The choice of the position of the auxiliary tower was based on the region in the field which has the least effective reflecting heliostats. The multi-tower configuration was initially applied to a 50 MWth conventional field in the case study region of Nigeria. The results from an optimized field show a marked increase in the annual thermal energy output and mean annual efficiency of the field. The biggest improvement in the optical efficiency loss factors be seen from the cosine, which records an improvement of 6.63%. Due to the size of the field, a minimal increment of 3020 MWht in the Levelized Cost of Heat (LCOH) was, however, recorded. In much larger fields, though, a higher number of weaker heliostats were witnessed in the field. The auxiliary tower in the field provides an alternate aim point for the weaker heliostat, thereby considerably cutting down on some optical losses, which in turn gives rise to higher energy output. At 400 MWth, the multi-tower field configuration provides a lower LCOH than the single conventional power tower field.

Studying about applied force and the output performance of sliding-mode triboelectric nanogenerators

Nano Energy ◽  
2018 ◽  
Vol 48 ◽  
pp. 292-300 ◽  
Author(s):  
Jiajia Shao ◽  
Tao Jiang ◽  
Wei Tang ◽  
Liang Xu ◽  
Tae Whan Kim ◽  
...  
Keyword(s):  
Sliding Mode ◽  
Applied Force ◽  
Output Performance ◽  
Triboelectric Nanogenerators

scholarly journals DESIGN OPTIMIZATION AND PERFORMANCE TEST OF MAGNETIC PICKUP FINGER SEED METERING DEVICE

2021 ◽  
pp. 137-144
Author(s):  
Fei Liu ◽  
Zhen Lin ◽  
Dapeng Li ◽  
Tao Zhang
Keyword(s):  
Vibration Frequency ◽  
Magnetic Induction ◽  
Vibration Amplitude ◽  
Magnetic Force ◽  
Performance Test ◽  
Simulation Software ◽  
National Standard ◽  
Design And Optimization ◽  
Seed Metering Device ◽  
Magnetic Induction Intensity

As the core part of precision seeder, the performance of pickup finger seed metering device directly affects the seeding quality. Aiming at the problem that the traditional pickup finger seed metering device can be easily affected by the performance of spring material, and the reliability of spring decreases with the increase of service time, a magnetic pickup finger seed metering device is designed to open and close the pickup finger by magnetic force, so as to improve the stability of seed metering performance. Through the design and optimization of permanent magnet structure, cam structure and seed taking pickup finger structure, the magnetic force distribution of ring magnet is analysed by using ANSYS Maxwell magnetic simulation software. Under the working speed of 3.9km/h, the vibration frequency, vibration amplitude and magnetic induction intensity were selected for orthogonal test. The experimental results show that the optimal combination of factors is vibration frequency 6Hz, vibration amplitude 3.1mm and magnetic induction intensity 316.34mT. Under the condition of the combination of operation parameters, the seed arrangement performance is 91.7% of the qualified rate, 6.2% of the replant rate and 2.1% of the missed rate, which meets the requirements of the national standard for the performance of the seeder. This study can provide a reference for the optimization of the structure and the improvement of the seed metering performance of the pickup finger seed metering device.

Deformable force amplification frame promoting piezoelectric stack energy harvesting: Parametric model, experiments and energy analysis

2016 ◽  
Vol 28 (7) ◽  
pp. 827-836 ◽  
Author(s):  
Wusi Chen ◽  
Ya Wang ◽  
Wei Deng
Keyword(s):  
Energy Harvesting ◽  
Modeling And Simulation ◽  
High Efficiency ◽  
Energy Conversion Efficiency ◽  
Parametric Model ◽  
Energy Output ◽  
Amplification Ratio ◽  
Simulation Results ◽  
Original Frame ◽  
Walking Locomotion

This article presents a nonlinear parametric model of force amplification ratio and an electromechanical model to couple the deformable frame with the piezoelectric stack in order to promote high-efficiency energy harvesting from human walking locomotion. Two improved frames (Frames I and II) are developed based on the modeling and simulation results. The experiments verified these modeling and simulation results that improved frames demonstrate a higher amplification ratio (8.4 for Frame II and 8.0 for Frame I), in comparison to the original frame (3.5). The experiments also verified these results that under the simulated walking excitation (100 N, ~1.4 Hz), the piezoelectric stack coupled with Frame II produces 4.1 mJ energy during each step, higher than the stand-alone stack (0.16 mJ) and the stack with the original frame (0.64 mJ). Note that the energy conversion efficiency of Frame II (9.1%) is even lower than that of Frame I (10.7%) and the stand-alone stack (25.8%). As such, this article concludes that the energy output of the piezoelectric stack depends largely on the frame deformations in terms of seven coupled frame parameters, instead of only one frame parameter (tilt angle), as commonly used in the referenced literature.

Sign in / Sign up

Export Citation Format

Share Document