Calculation of the stress-strain state of a chord flywheel with spokes

Moorlat, P. A.; Portnov, G. G.

doi:10.1007/bf00604464

Cited by 10 publications

(2 citation statements)

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“…Recalling equation (36), the optimal aspect ratio, (a/b) opt , for the coined disc is The optimal proportions of the disc are shown in Figure 3. Letting x ¼ x opt ¼ 0.5 in equation (38) and remembering (37), gives the optimal limit velocity…”

Section: Stresses Due To Centrifugationmentioning

confidence: 99%

“…Modern flywheels are built from advanced fiber-reinforced composite materials with the highest strengthto-density ratios technically available today (Table 2). Although many architectures have been proposed (bare filament and fanned brush, 24,25 radial rods and bars, 26,27 rim and spokes, [28][29][30] concentric rings, [31][32][33] laminated bi-directional or isotropic reinforcement, [34][35][36] radially-or geodesically-wrapped disc [37][38][39][40] ), the commonest and most straightforward technology to manufacture the composite flywheel is by filament winding. [41][42][43] Depending on the winding angle of the fibers, the wound flywheel can fail either in the radial (matrix failure) or in the circumferential direction (fiber failure), but the predicted durability of the latter is generally much greater than that of the former.…”

Section: Stresses Due To Centrifugationmentioning

confidence: 99%

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Mechanical design of flywheels for energy storage: A review with state-of-the-art developments

Dragoni

2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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For years, engineers and designers have capitalized on electrochemical batteries for long-term energy storage, which can only last for a finite number of charge–discharge cycles. More recently, compressed hydrogen is being scrutinized as a large-scale storage medium but this poses the risk of spreading high-pressure vessels with inflammable content. Historically, flywheels have provided an effective way to smooth out speed fluctuations in irregular machines and mechanisms. With advancements in composite materials, magnetic bearings, and mechatronic drives, flywheels have become the subject of extensive research as power storage devices for mobile or fixed installations. Flywheel energy storage systems are considered to be an attractive alternative to electrochemical batteries due to higher stored energy density, higher life term, deterministic state of charge and ecological operation. The mechanical performance of a flywheel can be attributed to three factors: material strength, geometry, and rotational speed. Focusing on the simple relationship between these variables, this paper reviews the literature of flywheel technology and explores the merits of four simple but unconventional flywheel configurations that have not been examined so far. Two geometries assume the use of monolithic isotropic materials two solutions are based on the use of high-strength strips or tapes wound up to form a multilayered structure.

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Section: Stresses Due To Centrifugationmentioning

confidence: 99%