Optimal design of multi-direction composite flywheel rotors

In this paper, considering the material properties of the composite flywheel and the characteristics of the pre-stressed structure, stresses and strains induced by rotor rotation and interference fit were calculated by finite element (FE) method based on the plane stress hypothesis, in the commercial software ANSYS. Based on the given material properties and the main dimension with a certain speed of rotation, three 2D FE-models of hybrid composite flywheel rotors with two-layer rotor structure were built with the unit property of plane stress, axisymmetric and plane strain respectively. Followed, the radial stress, circumferential stress and radial displacement of the rotor were obtained. The three simulation results are almost accordant with the present theoretical results. It shows that the numerical analyses are reliable. It can be shown that is advisable to design and optimize the flywheel rotor.

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Design and Testing of Composite Flywheel Rotors

Composite Materials: Testing and Design, Thirteenth Volume ◽

10.1520/stp18267s ◽

2009 ◽

pp. 3-3-20 ◽

Cited By ~ 13

Author(s):

CW Gabrys ◽

CE Bakis

Keyword(s):

Composite Flywheel ◽

Flywheel Rotors ◽

Design And Testing

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Optimal Design of a Hybrid Composite Flywheel with a Permanent Magnet Rotor

Journal of Composite Materials ◽

10.1177/002199839903301605 ◽

1999 ◽

Vol 33 (16) ◽

pp. 1544-1575 ◽

Cited By ~ 14

Author(s):

Sung K. Ha ◽

Hyun-Ik Yang ◽

Dong-Jin Kim

Keyword(s):

Optimal Design ◽

Permanent Magnet ◽

Hybrid Composite ◽

Composite Flywheel

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Durability of filament-wound composite flywheel rotors

Mechanics of Time-Dependent Materials ◽

10.1007/s11043-011-9150-0 ◽

2011 ◽

Vol 16 (1) ◽

pp. 71-83 ◽

Cited By ~ 5

Author(s):

Jun Koyanagi

Keyword(s):

Composite Flywheel ◽

Flywheel Rotors ◽

Filament Wound ◽

Filament Wound Composite ◽

Wound Composite

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Effects of Viscoelasticity on the Stress Evolution over the Lifetime of Filament-Wound Composite Flywheel Rotors for Energy Storage

Applied Sciences ◽

10.3390/app11209544 ◽

2021 ◽

Vol 11 (20) ◽

pp. 9544

Author(s):

Miles Skinner ◽

Pierre Mertiny

Keyword(s):

Energy Storage ◽

High Speed ◽

Failure Modes ◽

Fatigue Loading ◽

Operating Conditions ◽

Storage Device ◽

Worst Case ◽

Composite Flywheel ◽

Flywheel Rotors ◽

Press Fit

High-velocity and long-lifetime operating conditions of modern high-speed energy storage flywheel rotors may create the necessary conditions for failure modes not included in current quasi-static failure analyses. In the present study, a computational algorithm based on an accepted analytical model was developed to investigate the viscoelastic behavior of carbon fiber reinforced polymer composite flywheel rotors with an aluminum hub assembled via a press-fit. The Tsai‑Wu failure criterion was applied to assess failure. Two simulation cases were developed to explore the effects of viscoelasticity on composite flywheel rotors, i.e., a worst-case operating condition and a case akin to realistic flywheel operations. The simulations indicate that viscoelastic effects are likely to reduce peak stresses in the composite rim over time. However, viscoelasticity also affects stresses in the hub and the hub-rim interface in ways that may cause rotor failure. It was further found that charge-discharge cycles of the flywheel energy storage device may create significant fatigue loading conditions. It was therefore concluded that the design of composite flywheel rotors should include viscoelastic and fatigue analyses to ensure safe operation.

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