PubAg

Main content area

You searched for: Subject "vibration" Remove constraint Subject: "vibration"
Start Over

Search

2,863  Search Results

« Previous | 1 - 20 of 2,863 |
Number of results to display per page

Search Results

1. Discharge of granular materials in a hemispherical bottom silo under vertical vibration

Author:
Du, Jianping; Liu, Chuanping; Wang, Chengcheng; Wu, Ping; Ding, Yulong; Wang, Li
Source:
Powder technology 2020 v.372 pp. 128-135
ISSN:
0032-5910
Subject:
vibration,   etc   ; mixing; silos;     Show all 3 Subjects
Abstract:
... The discharge of granular materials from a silo subject to vertical vibration was studied in cylindrical silos. A hemispherical bottom silo with five different angles of outlets was proposed. The effects of the stirring shaft angular velocity, the dimensionless depth of granular materials, and the discharge exit angle on the discharge in the silo were compared. An enhancement factor was proposed t ...
DOI:
10.1016/j.powtec.2020.06.006

2. Experimental study on 3D vibrated packing densification of mono-sized dodecahedral particles

Author:
Li, Junwei; An, Xizhong; Wang, Ju; Zhao, Haiyang; Zou, Ruiping; Dong, Kejun; Gou, Dazhao
Source:
Powder technology 2020 v.367 pp. 703-712
ISSN:
0032-5910
Subject:
vibration,   etc   ; computers; containers; microstructure;     Show all 4 Subjects
Abstract:
... Packing densification of mono-sized regular dodecahedral particles subjected to 3D vibrations was studied through systematical physical experiments. The influences of various vibration conditions and container size on the packing density were analyzed and the operating parameters were optimized. The obtained microstructures of different packings were characterized through 3D CT non-destructive ins ...
DOI:
10.1016/j.powtec.2020.04.020

3. Comparison of DEM predictions and measured wall-media contact forces and work in a vibratory finisher

Author:
da Silva Maciel, Lucas; Spelt, Jan K.
Source:
Powder technology 2020 v.366 pp. 434-447
ISSN:
0032-5910
Subject:
vibration,   etc   ; deformation; models; prediction;     Show all 4 Subjects
Abstract:
... Discrete element methods (DEM) have been widely used in predicting the behavior of vibrated granular media, including that in vibratory finishing (VF) processes. In VF loose abrasive particles are fluidized by a vibrating container and the particle vibration work on the surface of parts entrained in the granular bed. In the present work, DEM was used to predict the forces exerted by the container ...
DOI:
10.1016/j.powtec.2020.02.014

4. A two-degree-of-freedom string-driven rotor for efficient energy harvesting from ultra-low frequency excitations

Author:
Tan, Qinxue; Fan, Kangqi; Tao, Kai; Zhao, Liya; Cai, Meiling
Source:
Energy 2020 v.196 pp. 117107
ISSN:
0360-5442
Subject:
vibration,   etc   ; electric power; energy;     Show all 3 Subjects
Abstract:
... The aim of this study is to report a two-degree-of-freedom (2-DOF) string-driven rotor to convert ultra-low frequency vibrations to high-speed rotation motion of a rotor, which enables the efficient exploitation of ultra-low frequency mechanical energy. The proposed rotor structure consists of a disk-shaped rotor, a spring and two pieces of string, featuring extremely simple configuration. Based o ...
DOI:
10.1016/j.energy.2020.117107

5. Convection behavior of ellipsoidal particles in a quasi-two-dimensional bed under vertical vibration

Author:
Chen, Biduan; Wu, Ping; Xing, Huihui; Liu, Haowei; Li, Li; Wang, Li
Source:
Powder technology 2020 v.363 pp. 575-583
ISSN:
0032-5910
Subject:
vibration,   etc   ; anisotropy; convection; energy;     Show all 4 Subjects
Abstract:
... Ellipsoidal particles are anisotropic in shape. Production practice often involves the distribution and convection of ellipsoidal particles under external excitation. However, few studies have focused on convection in ellipsoidal particles. Herein, we experimentally investigated the convection behavior of ellipsoidal particles in a two-dimensional bed under vertical vibration. Several patterns wer ...
DOI:
10.1016/j.powtec.2020.01.004

6. Formation and Stability of Bulk Nanobubbles by Vibration

Author:
Fang, Zhou; Wang, Xingya; Zhou, Limin; Zhang, Lijuan; Hu, Jun
Source:
Langmuir 2020 v.36 no.9 pp. 2264-2270
ISSN:
1520-5827
Subject:
vibration,   etc   ; air; bubbles; nanobubbles;     Show all 4 Subjects
Abstract:
... Vibration is a very common process in nature, industry, biology, etc. Thus, whether vibration could induce the formation of nanoscale bubbles in water or not is very important for some chemical or biological reactions. In this paper, we designed a control experiment to simulate the vibration process to explore the production and stability of bulk nanobubbles. Experimental results showed that the v ...
DOI:
10.1021/acs.langmuir.0c00036

7. An experimental study of packing of ellipsoids under vibrations

Author:
Li, C.X.; Zou, R.P.; Pinson, D.; Yu, A.B.; Zhou, Z.Y.
Source:
Powder technology 2020 v.361 pp. 45-51
ISSN:
0032-5910
Subject:
vibration,   etc   ; feeding methods; powders;     Show all 3 Subjects
Abstract:
... Packing of ellipsoidal particles with a range of aspect ratios is experimentally studied under vibration conditions. The effects of operational conditions such as dropping heights, feeding methods, and vibration modes on packing density are investigated systematically. The results indicate that packing density first increases with dropping height, and then tends to be a certain value when dropping ...
DOI:
10.1016/j.powtec.2019.10.115

8. DEM study on the packing density and randomness for packing of ellipsoids

Author:
Gan, Jieqing; Yu, Aibing
Source:
Powder technology 2020 v.361 pp. 424-434
ISSN:
0032-5910
Subject:
vibration,   etc   ; particle size; particles;     Show all 3 Subjects
Abstract:
... This paper presents a numerical study on the packing density and bed orderness in packing and vibration of ellipsoids by discrete element method (DEM). The shapes considered are oblate and prolate spheroids, with aspect ratio varying from 0.15 to 4.0. It is shown that under the poured packing conditions of coarse ellipsoids, flat or elongate particles show strong orientation preference on the hori ...
DOI:
10.1016/j.powtec.2019.07.012

9. Measurements of wall-media contact forces and work in a vibratory finisher

Author:
da Silva Maciel, Lucas; Spelt, Jan K.
Source:
Powder technology 2020 v.360 pp. 911-920
ISSN:
0032-5910
Subject:
vibration,   etc   ; powders; steel;     Show all 3 Subjects
Abstract:
... The bulk flow and local impact velocities of loose abrasive particles in vibratory finishing operations have been explained in the literature in terms of the forces exerted by the vibrating container walls. In the present work, these forces were measured using a force sensor embedded in the walls of a vibrating tub finisher loaded with various amounts of steel media and subject to different vibrat ...
DOI:
10.1016/j.powtec.2019.10.066

10. Packing of different shaped tetrahedral particles: DEM simulation and experimental study

Author:
Zhao, Bo; An, Xizhong; Wang, Yang; Zhao, Haiyang; Shen, Lingling; Sun, Xudong; Zou, Ruiping
Source:
Powder technology 2020 v.360 pp. 21-32
ISSN:
0032-5910
Subject:
vibration,   etc   ; models; powders;     Show all 3 Subjects
Abstract:
... Packings of different mono-sized tetrahedral particles under 3D vibrations were studied by physical experiments and DEM simulations. The effects of vibration conditions and particle shape on the packing densification were comprehensively investigated and optimized. Corresponding characteristic microscopic properties such as coordination number (CN), particle contact type, radial distribution funct ...
DOI:
10.1016/j.powtec.2019.09.072

11. Using a vibrating electrical curtain conveyor for separation of plastic/metal particles

Author:
Hadj Ali, Aicha; Zelmat, Mohamed Elmouloud; Touhami, Seddik; Louhadj, Soumia; Benmimoun, Youcef; Louati, Hamza; Tilmatine, Amar
Source:
Powder technology 2020 v.373 pp. 267-273
ISSN:
0032-5910
Subject:
vibration,   etc   ; electric potential difference; granules;     Show all 3 Subjects
Abstract:
... The electrical curtain conveyor (ECC) is generally used for moving high-resistivity micronized particles. A new separation technique of μm- and cm-sized metal/plastic particles was developed after analysing a newly observed attraction force applied on metal particles. A three-phase vibrating ECC was described in this paper, where the plastic particles move because of the vibration, and the metal g ...
DOI:
10.1016/j.powtec.2020.06.070

12. Rotating detonation mode recognition using non-intrusive vibration sensing

Author:
Zhong, Yepan; Wu, Yun; Jin, Di; Yang, Xingkui; Chen, Xin
Source:
Energy 2020 v.199 pp. 117466
ISSN:
0360-5442
Subject:
vibration,   etc   ; entropy; longevity; turbines; wavelet;     Show all 5 Subjects
Abstract:
... Rotating detonation engine can be integrated with gas turbines to realize a high-performance power unit. We propose a novel method of non-intrusive vibration sensing for rotating detonation mode recognition. The conventional method is intrusive and exposes the pressure sensor to the high-temperature and high-pressure detonation wave, which limits the sensor life. In the proposed method, the vibrat ...
DOI:
10.1016/j.energy.2020.117466

13. Introducing revolute joints into piezoelectric energy harvesters

Author:
Li, Zhongjie; Yang, Zhengbao; Naguib, Hani E.
Source:
Energy 2020 v.192 pp. 116604
ISSN:
0360-5442
Subject:
vibration,   etc   ; electrical equipment; power generation;     Show all 3 Subjects
Abstract:
... In this paper, we originally report an approach for cantilever piezoelectric energy harvesters (PEHs) for frequency tuning and performance improvement. The proposed scheme implements embedment of revolute joint(s) into PEH structure. We investigated two ways of embedment: the prior one is to replace the clamped edge partially with a joint and the other is to incorporate joint(s) into the substrate ...
DOI:
10.1016/j.energy.2019.116604

14. Nanochemical Investigation of Degradation in Organic–Inorganic Hybrid Perovskite Films Using Infrared Nanoscopy

Author:
Yu, Hyang Mi; Oh, Hye Min; Park, Dae Young; Jeong, Mun Seok
Source:
Journal of physical chemistry 2020 v.124 no.6 pp. 3915-3922
ISSN:
1932-7455
Subject:
vibration,   etc   ; absorption; oxygen; photoluminescence; spectroscopy;     Show all 5 Subjects
Abstract:
... The degradation of organic–inorganic hybrid perovskite (OHP) films is a crucial issue in OHP optoelectronics. Herein, we investigate the degradation process of OHP films by simultaneous measurement of topography and infrared absorption mapping images using photothermal induced resonance spectroscopy. By tracking the intensity of molecular vibration, we found that oxygen and moisture are easily att ...
DOI:
10.1021/acs.jpcc.0c00143

15. Modal vibration response of rice combine harvester frame under multi-source excitation

Author:
Chen, Shuren; Zhou, Yuepeng; Tang, Zhong; Lu, Shunan
Source:
Biosystems engineering 2020 v.194 pp. 177-195
ISSN:
1537-5110
Subject:
vibration,   etc   ; combine harvesters; deformation; dynamic models; rice;     Show all 5 Subjects
Abstract:
... When a rice combine harvester operates in the field, its frame vibrates significantly under multi-source excitation forces which can cause complex vibration and structural deformation. The vibration response of combine harvester frame under multi-source excitation was deduced. Based on the multi-source excitation of combine harvester, the chassis frame and the threshing frame were assembled into a ...
DOI:
10.1016/j.biosystemseng.2020.04.002

16. A goblet-like non-linear electromagnetic generator for planar multi-directional vibration energy harvesting

Author:
Gu, Yuhan; Liu, Weiqun; Zhao, Caiyou; Wang, Ping
Source:
Applied energy 2020 v.266 pp. 114846
ISSN:
0306-2619
Subject:
vibration,   etc   ; electricity; energy; humans; magnetism; walking;     Show all 6 Subjects
Abstract:
... A novel electromagnetic energy harvester for in-plane multi-directional vibrations is developed by letting a magnetic ball move on a two-dimensional surface which is generated from the rotation of a one-dimensional bi-stable potential curve. A goblet-like structure is designed to keep the ball on the nonlinear potential surface. Due to the special symmetric configuration, in-plane excitations from ...
DOI:
10.1016/j.apenergy.2020.114846

17. An asymmetric bending-torsional piezoelectric energy harvester at low wind speed

Author:
Jia, Jinda; Shan, Xiaobiao; Upadrashta, Deepesh; Xie, Tao; Yang, Yaowen; Song, Rujun
Source:
Energy 2020 v.198 pp. 117287
ISSN:
0360-5442
Subject:
vibration,   etc   ; energy; models; wind power; wind speed;     Show all 5 Subjects
Abstract:
... This paper presents a detailed investigation on a novel asymmetric vortex-induced piezoelectric harvester for capturing wind energy at low wind speed. The asymmetric energy harvester undergoes both bending and torsional vibration caused by vortex-induced vibration. A comprehensive nonlinear distributed model of compound bending-torsion piezoelectric energy harvester is derived using the energy met ...
DOI:
10.1016/j.energy.2020.117287

18. Numerical investigation on the pressure loss of coarse particles hydraulic lifting in the riser with the lateral vibration

Author:
Liu, Yong; Chen, Luyun
Source:
Powder technology 2020 v.367 pp. 105-114
ISSN:
0032-5910
Subject:
vibration,   etc   ; mathematical models; particle size; powders;     Show all 4 Subjects
Abstract:
... This study focuses on the effect of the riser lateral vibration on the pressure loss of coarse particles hydraulic lifting by the numerical simulation. Euler-Euler two-fluid model based on kinetic theory is used to simulate the flow behavior of coarse particles in the riser, and the numerical model has been validated by using the experimental data. The dynamic grid technique is employed to simulat ...
DOI:
10.1016/j.powtec.2020.03.026

19. Triboelectric charging of polyethylene powders: Comparison of same-material and different-material contributions to the charge build-up

Author:
Konopka, L.; Jantač, S.; Vrzáček, M.; Svoboda, M.; Kosek, J.
Source:
Powder technology 2020 v.367 pp. 713-723
ISSN:
0032-5910
Subject:
vibration,   etc   ; catalytic activity; polyethylene; polymerization; powders;     Show all 5 Subjects
Abstract:
... The understanding of triboelectric charging of industrially important powders can help in avoiding or controlling the particle agglomeration and wall sheeting. We developed a new experimental approach to study both same-material particle-particle (PP) and different-material particle-wall (PW) charging of nascent polyethylene (PE) particles born by catalytic polymerization. We constructed a simple ...
DOI:
10.1016/j.powtec.2020.04.029

20. Particulate patterns generated by liquid templates

Author:
Barba Maggi, Diego; Martino, Román; Rosen, Marta; Piva, Marcelo; Boschan, Alejandro
Source:
Powder technology 2020 v.366 pp. 598-609
ISSN:
0032-5910
Subject:
vibration,   etc   ; liquids; surface waves; topography; wavelengths;     Show all 5 Subjects
Abstract:
... We characterize the assembly of microscopic particles in patterned beds. The particles are immersed in a liquid template generated by vibration. We study, at the same time, the waves in the liquid surface, and the topography of the bed. Results show that the surface waves are travelling, harmonic and capillary waves, in contrast with previous studies that examined Faraday subharmonic waves. The pa ...
DOI:
10.1016/j.powtec.2020.03.004