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1. Powders flowability assessment in granular compaction: What about the consistency of Hausner ratio?

Author:
Saker, A.; Cares-Pacheco, M.-G.; Marchal, P.; Falk, V.
Source:
Powder technology 2019 v.354 pp. 52-63
ISSN:
0032-5910
Subject:
vibration,   etc   ; energy; powders;     Show all 3 Subjects
Abstract:
... In this study, powder flowability is assessed during granular compaction under free surface conditions by using Hausner ratio (HR) as flowability index. Different kinds of pharmaceutical and food powders were examined. The assessment of the flow properties of these powders according to HR is obtained using three compaction devices: DensiTap®, GranuPack® and a homemade Vibratory device (particle du ...
DOI:
10.1016/j.powtec.2019.05.032

2. Particle scale study on the crystallization of mono-sized cylindrical particles subject to vibration

Author:
Qian, Quan; An, Xizhong; Zhao, Haiyang; Dong, Kejun; Wu, Yongli; Fu, Haitao; Zhang, Hao; Yang, Xiaohong
Source:
Powder technology 2019 v.352 pp. 470-477
ISSN:
0032-5910
Subject:
vibration,   etc   ; crystallization; powders; temperature;     Show all 4 Subjects
Abstract:
... In this paper, the transition from random to ordered packings of mono-sized cylindrical particles under 3D mechanical vibration was simulated by discrete element method (DEM). The effects of particle aspect ratio, size of the particulate system and container wall on the granular crystallization were investigated. And the mechanisms were analyzed through the characterization of the order transition ...
DOI:
10.1016/j.powtec.2019.05.002

3. A tunable frequency up-conversion wideband piezoelectric vibration energy harvester for low-frequency variable environment using a novel impact- and rope-driven hybrid mechanism

Author:
Zhang, Jinhui; Qin, Lifeng
Source:
Applied energy 2019 v.240 pp. 26-34
ISSN:
0306-2619
Subject:
vibration,   etc   ; energy; theoretical models;     Show all 3 Subjects
Abstract:
... This paper presents a tunable frequency up-conversion wideband piezoelectric vibration energy harvester using a novel impact- and rope-driven hybrid mechanism, in which a high frequency generating beam is triggered by the rope or impacted directly by the low frequency driving beam. A mass-spring-damper equivalent model was built to understand the operation mechanism of the proposed piezoelectric v ...
DOI:
10.1016/j.apenergy.2019.01.261

4. Classification and sudden departure mechanism of high-speed landslides caused by the 2008 Wenchuan earthquake

Author:
Zhao, Xiaoyan; Hu, Kai; Burns, Scott F.; Hu, Houtian
Source:
Environmental earth sciences 2019 v.78 no.5 pp. 125
ISSN:
1866-6280
Subject:
vibration,   etc   ; earthquakes; landslides;     Show all 3 Subjects
Abstract:
... The sudden departure mechanism of high-speed landslides has always constituted a popular yet difficult research topic. Therefore, although a systematic classification of high-speed landslides is necessary, particularly since different types of landslides exhibit different mechanisms, an associated methodology has yet to be established. This paper investigates an easily overlooked phenomenon—landsl ...
DOI:
10.1007/s12665-019-8083-9

5. Numerical realization and structure characterization on random close packings of cuboid particles with different aspect ratios

Author:
Xie, Zhouzun; An, Xizhong; Yang, Xiaohong; Li, Changxing; Shen, Yansong
Source:
Powder technology 2019 v.344 pp. 514-524
ISSN:
0032-5910
Subject:
vibration,   etc   ; models; powders;     Show all 3 Subjects
Abstract:
... Packing processes of cuboid particles with different aspect ratios (h/b) under 3D vibrations were numerically reproduced by discrete element method using multi-sphere model. The influences of vibration conditions (e.g. vibration time, frequency, and amplitude) and particle shape on the packing densification were comprehensively analyzed. The macro property such as packing density (ρ) and micro pro ...
DOI:
10.1016/j.powtec.2018.12.017

6. Numerical investigations on random close packings of cylindrical particles with different aspect ratios

Author:
Qian, Quan; An, Xizhong; Zhao, Haiyang; Dong, Kejun; Yang, Xiaohong
Source:
Powder technology 2019 v.343 pp. 79-86
ISSN:
0032-5910
Subject:
vibration,   etc   ; algorithms; powders;     Show all 3 Subjects
Abstract:
... Random close packings (RCP) of different shaped cylindrical particles under optimal vibration conditions were numerically reproduced using discrete element method. Corresponding characteristic macro and micro properties such as packing density, coordination number (CN), radial distribution function (RDF), particle orientation, orientation randomness and forces/stresses as a function of particle as ...
DOI:
10.1016/j.powtec.2018.11.014

7. Effect of vibrations on granular material flows down an inclined plane using DEM simulations

Author:
Gaudel, Naïma; Kiesgen De Richter, Sébastien
Source:
Powder technology 2019 v.346 pp. 256-264
ISSN:
0032-5910
Subject:
vibration,   etc   ; powders; rheology; temperature profiles;     Show all 4 Subjects
Abstract:
... The influence of transverse mechanical vibrations on dense flows of granular material down inclines with a rough bed is analyzed using 3D DEM simulations and compared with experimental results. The vibrations make appear two distinct behaviors: a gravity-driven regime and a vibration-driven regime. In the gravity-driven regime, our results are consistent with previous studies from the literature. ...
DOI:
10.1016/j.powtec.2019.01.080

8. Synchronous condenser operation in Francis turbines: Effects in the runner stress and machine vibration

Author:
Valentín, David; Presas, Alexandre; Valero, Carme; Egusquiza, Mònica; Egusquiza, Eduard
Source:
Renewable energy 2020 v.146 pp. 890-900
ISSN:
0960-1481
Subject:
vibration,   etc   ; equipment; mechanical properties; prototypes; renewable energy sources; turbines; Canada; United States;     Show all 8 Subjects
Abstract:
... Reactive power shortage is one of the current issues that endanger the stability of the power grid systems. Some massive blackouts have been experienced in the past years due to the unbalance of reactive power. One of the solutions to provide the necessary reactive power to the grid is to operate generators as motors and supply or absorb reactive power when needed. Hydraulic turbines are the most ...
DOI:
10.1016/j.renene.2019.07.041

9. Vibration analysis for large-scale wind turbine blade bearing fault detection with an empirical wavelet thresholding method

Author:
Liu, Zepeng; Zhang, Long; Carrasco, Joaquin
Source:
Renewable energy 2020 v.146 pp. 99-110
ISSN:
0960-1481
Subject:
vibration,   etc   ; blades; case studies; electric power; energy; renewable energy sources; wavelet; wind farms; wind turbines;     Show all 9 Subjects
Abstract:
... Blade bearings, also termed pitch bearings, are joint components of wind turbines, which can slowly pitch blades at desired angles to optimize electrical energy output. The failure of blade bearings can heavily reduce energy production, so blade bearing fault diagnosis is vitally important to prevent costly repair and unexpected failure. However, the main difficulties in diagnosing low-speed blade ...
DOI:
10.1016/j.renene.2019.06.094

10. Flexible dynamic modeling and analysis of drive train for Offshore Floating Wind Turbine

Author:
Li, Zhanwei; Wen, Binrong; Wei, Kexiang; Yang, Wenxian; Peng, Zhike; Zhang, Wenming
Source:
Renewable energy 2020 v.145 pp. 1292-1305
ISSN:
0960-1481
Subject:
vibration,   etc   ; dynamic models; finite element analysis; mechanical drives; renewable energy sources; turbulent flow; wind; wind turbines;     Show all 8 Subjects
Abstract:
... Drive train has a significant influence on the reliability of wind turbines. As for the Offshore Floating Wind Turbine (OFWT), the importance of the drive train is even more prominent due to the more complex operating conditions at the ocean. In this study, dynamic characteristics of the OFWT drive train are investigated based on flexible dynamic model. First, this paper presents a flexible dynami ...
DOI:
10.1016/j.renene.2019.06.116

11. Performance evaluation in enabling safety for a hydropower generation system

Author:
Li, Huanhuan; Xu, Beibei; Riasi, Alireza; Szulc, Przemyslaw; Chen, Diyi; M'zoughi, Fares; Skjelbred, Hans Ivar; Kong, Jiehong; Tazraei, Pedram
Source:
Renewable energy 2019 v.143 pp. 1628-1642
ISSN:
0960-1481
Subject:
vibration,   etc   ; engineering; nonlinear models; risk; water power;     Show all 5 Subjects
Abstract:
... Performance evaluation of a hydropower generation system is a critical science and engineering problem, with ubiquitous presence in hydropower plant applications. This study aims at a nonlinear model of the hydropower generation system with multiple units, where a novel modeling methodology for the start-up transient process is presented. Experimental data from an existing hydropower station are c ...
DOI:
10.1016/j.renene.2019.05.113

12. Centrifuge modeling of dynamic response of high fill slope by using generalized scaling law

Author:
Zhou, Yan-Guo; Meng, Di; Ma, Qiang; Huang, Bo; Ling, Dao-Sheng; Chen, Yun-Min
Source:
Engineering geology 2019 v.260 pp. 105213
ISSN:
0013-7952
Subject:
vibration,   etc   ; earthquakes; engineering; geophysics; models; prototypes; soil;     Show all 7 Subjects
Abstract:
... The development of physical modeling for mega engineering prototypes requires sophisticated use of the capability of current centrifuge facilities. In this study, centrifuge model tests were performed to investigate the dynamic response of high fill slope by using generalized scaling law in an improved way. Firstly the two-stage generalized scaling law was partly re-organized by considering the se ...
DOI:
10.1016/j.enggeo.2019.105213

13. Design of energy harvester using rotating motion rectifier and its application on bicycle

Author:
Yang, Yiqing; Pian, Yawei; Liu, Qiang
Source:
Energy 2019 v.179 pp. 222-231
ISSN:
0360-5442
Subject:
vibration,   etc   ; electric power; energy; resistors; road transportation;     Show all 5 Subjects
Abstract:
... The energy harvester has been employed to transform mechanical vibration into electrical power in the field of road transportation. An electromagnetic energy harvester for bicycle application to recycle low-frequency vibration is proposed. The input of up-down motion is transformed into bidirectional rotation by the transmission part, and then translated into unidirectional rotation by the rotatin ...
DOI:
10.1016/j.energy.2019.05.036

14. Energy harvesting performance of unimorph piezoelectric cantilever generator using interdigitated electrode lead zirconate titanate laminate

Author:
Lee, Min-seon; Kim, Chang-il; Park, Woon-ik; Cho, Jeong-ho; Paik, Jong-hoo; Jeong, Young Hun
Source:
Energy 2019 v.179 pp. 373-382
ISSN:
0360-5442
Subject:
vibration,   etc   ; capacitance; electrodes; energy; lead; silver; zirconium;     Show all 7 Subjects
Abstract:
... An unimorph piezoelectric cantilever generator with an interdigitated electrode (IDE) was developed for application to vibration energy harvesters driven in longitudinal mode. Lead zirconate titanate (PZT) thick film was fabricated by lamination of 10 sheets printed with Ag IDE; the laminated film was subsequently cofired at 850 °C for 2 h. Compared with a conventional IDE PZT thick film, the appr ...
DOI:
10.1016/j.energy.2019.04.215

15. Modeling and characterization of permendur cantilever beam for energy harvesting

Author:
Ghodsi, Mojtaba; Ziaiefar, Hamidreza; Mohammadzaheri, Morteza; Al-Yahmedi, Amur
Source:
Energy 2019 v.176 pp. 561-569
ISSN:
0360-5442
Subject:
vibration,   etc   ; energy; equations; guidelines; models; prediction;     Show all 6 Subjects
Abstract:
... This article presents the development of a cantilever harvester made of permendur with tip excitation. In the beginning, the dynamic behavior of the tip-mass beam harvester subjected to a harmonic bending force at the free-end has been studied. Also, the magneto-mechanical model, rotating unbalance equations and Faraday's Law have been combined to present the general model for generated power. Fur ...
DOI:
10.1016/j.energy.2019.04.019

16. Analysis of Influence Factors on the Sieving Efficiency in Tea Vibration Sieving

Author:
Zhao, Zhangfeng; Zhu, Hejia; Chen, Guoda; Zhong, Jiang; Chen, Lun
Source:
Agricultural research 2019 v.8 no.2 pp. 279-286
ISSN:
2249-720X
Subject:
vibration,   etc   ; computer software; models; sieving; tea;     Show all 5 Subjects
Abstract:
... During the process of tea vibration sieving, the instability of tea flow has great influence on the sieving efficiency, which contains the sieving quality and sieving productivity. In this paper, the influence factors on the sieving efficiency in tea vibration sieving were studied. Firstly, the mechanism analysis of tea vibration sieving was conducted. Through the force and motion analysis of the ...
DOI:
10.1007/s40003-018-0381-z

17. Dependence between the vibration characteristics of the proton exchange membrane fuel cell and the stack structural feature

Author:
Ahn, Sangkeun; Koh, Hyeongcheol; Lee, Jongho; Park, Junhong
Source:
Environmental research 2019 v.173 pp. 48-53
ISSN:
0013-9351
Subject:
vibration,   etc   ; durability; fuel cells; type collections;     Show all 4 Subjects
Abstract:
... The purpose of this study was to investigate dynamic characteristics of a proton exchange membrane fuel cell (PEMFC). Fuel cell mounted on a vehicle is excited by road irregularities in operation conditions. To minimize performance degradation, proper vibration isolation after considering vibration properties is required. The vibration modal characteristics of PEMFC was measured by impact test to ...
DOI:
10.1016/j.envres.2019.03.022

18. Radius construction by Micrathena duodecimspinosa (Araneae: Araneidae): a puzzle within a puzzle

Author:
Eberhard, William
Source:
TheJournal of arachnology 2019 v.47 no.1 pp. 57-62
ISSN:
0161-8202
Subject:
vibration,   etc   ; Araneidae; animal behavior; geometry; webs;     Show all 5 Subjects
Abstract:
... Araneid orb weavers systematically weaken the radii in their orbs by partially or completely removing the provisional radial lines laid during radius construction. Removal of provisional radii by Micrathena duodecimspinosa (O. Pickard-Cambridge, 1890) tended to be less complete for those radii that were attached later during the radius construction stage to the same frame line; this pattern differ ...
DOI:
10.1636/0161-8202-47.1.57

19. Dynamic evolution of a bulb hydroelectric generating unit considering effects of the blades

Author:
Yan, Donglin; Chen, Qijuan; Zheng, Yang; Wang, Weiyu; An, Yuchen
Source:
Energy conversion and management 2019 v.185 pp. 183-201
ISSN:
0196-8904
Subject:
vibration,   etc   ; blades; models; turbines; water power;     Show all 5 Subjects
Abstract:
... The stability problems of the hydroelectric generating unit caused by the vibration of the runner blades have been gradually exposed in the long-term operation, especially in the hydropower stations equipped with the bulb turbine. However, in the previous studies, the effects of the blades were not considered. Aiming at these problems, this research will be focused on studying the dynamic characte ...
DOI:
10.1016/j.enconman.2019.02.002

20. Study on static and dynamic characteristics of an axial fan with abnormal blade under rotating stall conditions

Author:
Zhang, Lei; He, Ruiyang; Wang, Xin; Zhang, Qian; Wang, Songling
Source:
Energy 2019 v.170 pp. 305-325
ISSN:
0360-5442
Subject:
vibration,   etc   ; blades; deformation; equations; models; turbulent flow;     Show all 6 Subjects
Abstract:
... Based on Reynolds averaged Navier-Stokes (RANS) equation and Realizable k-ε turbulence model, the influence of abnormal deflection of two adjacent moving blades in an axial fan was discussed numerically. The flow field in the rotor, static and dynamic characteristics of normal blades and four abnormal blades combinations under rotating stall are compared. The results show that the abnormal blades ...
DOI:
10.1016/j.energy.2018.12.125