Improving the performance of galloping micro-power generators by passively manipulating the trailing edge

2018 ◽  
Vol 112 (8) ◽  
pp. 083503 ◽  
Author(s):  
J. Noel ◽  
R. Yadav ◽  
G. Li ◽  
M. F. Daqaq
Keyword(s):  
Trailing Edge ◽  
Power Generators ◽  
Micro Power

Rapid Synthesis of Piezoelectric ZnO-Nanostructures for Micro Power-Generators

2013 ◽  
Vol 29 (10) ◽  
pp. 893-897 ◽  
Author(s):  
Nai-Feng Hsu ◽  
Tien-Kan Chung ◽  
Ming Chang ◽  
Hong-Jun Chen
Keyword(s):  
Zno Nanostructures ◽  
Rapid Synthesis ◽  
Power Generators ◽  
Micro Power

Experimental Response of Simple Gas Hybrid Bearings for Oil-Free Turbomachinery

2003 ◽  
Author(s):  
Deborah A. Wilde ◽  
Luis San Andre´s
Keyword(s):  
High Speed ◽  
Damping Ratio ◽  
Dynamic Force ◽  
Test Results ◽  
Power Generators ◽  
Foil Bearings ◽  
Feed Pressure ◽  
Micro Power ◽  
Lift Off ◽  
Stiffness And Damping

Gas film bearings offer unique advantages enabling successful deployment of high-speed micro-turbomachinery (< 0.4 MW). Current applications encompass micro power generators, air cycle machines and turbo expanders. Mechanically complex gas foil bearings are in use; however, their excessive cost and lack of calibrated predictive tools deter their application to mass-produced systems. The present investigation provides experimental results for the rotordynamic performance of a small rotor supported on simple and inexpensive hybrid gas bearings with static and dynamic force characteristics desirable in high-speed turbomachinery. These characteristics are adequate load support, stiffness and damping coefficients, low friction and wear during rotor startup and shutdown, and most importantly, enhanced rotordynamic stability. The test results evidence the paramount effect of feed pressure on early rotor lift off and substantially higher threshold speeds of rotordynamic instability. Higher supply pressures also determine larger bearing direct stiffnesses, and thus bring an increase in the rotor-bearing system critical speed albeit with a reduction in damping ratio.

Micro-Power Generators Employing Commercially Available Piezoelectric Materials

2012 ◽  
Author(s):  
Sebastian Roa-Prada
Keyword(s):  
Cantilever Beam ◽  
High Performance ◽  
Piezoelectric Materials ◽  
Geometrical Configuration ◽  
Power Harvesting ◽  
Power Generators ◽  
Electronic Circuitry ◽  
Micro Power ◽  
Fixed End ◽  
Piezoelectric Devices

Piezoelectric devices are among the most efficient and reliable solutions for power harvesting from environment vibrations. Considerable effort has been devoted recently in the engineering community towards reducing the size and increasing the power density of these generators at the micro level. The objectives of this paper are to identify commercially available materials and to determine the geometrical configuration best suited for energy harvesting applications by assessing their performance when used in a cantilever beam micro-generator with a fixed volume. To achieve this objective, a comprehensive database with properties of commercially available piezoelectric materials is first established. Then electro-mechanical simulation is carried out to study the changes in device performance with respect to variations in the geometrical configuration for a vibrating beam with a fixed end and a mass attached at the free tip. Once the materials and geometrical configuration providing the highest power output are identified, other aspects important to system implementation are discussed such as feasibility of fabrication at the desired scale and integration with the electronic circuitry. The results obtained provide guidelines for designing and realizing reduced scale cantilever-beam piezoelectric harvesters employing high performance, commercially available materials.

scholarly journals A Low-Profile Autonomous Interface Circuit for Piezoelectric Micro-Power Generators

2021 ◽  
pp. 1-14
Author(s):  
Berkay Ciftci ◽  
Salar Chamanian ◽  
Aziz Koyuncuoglu ◽  
Ali Muhtaroglu ◽  
Haluk Kulah
Keyword(s):  
Interface Circuit ◽  
Power Generators ◽  
Low Profile ◽  
Micro Power
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