Elastic rope energy storage mechanism

What is the energy density of twisted ropes?

Notably, the gravimetric energy density of these twisted ropes reaches up to 2.1 MJ kg −1, exceeding the energy storage capacity of mechanical steel springs by over four orders of magnitude and surpassing advanced lithium-ion batteries by a factor of three.

What are the functions of elastic storage device using spiral spring?

The principal functions of elastic storage device using spiral spring are energy storage and transfer in space and time. Elastic energy storage using spiral spring can realize the balance between energy supply and demand in many applications.

Can mechanical energy be used in twisted ropes?

To demonstrate the application and energy conversion efficiency of the stored mechanical energy in the twisted rope samples, we rotated a circular disc 8 × 10 3 times heavier than that of the y-rope (TPU) using the energy stored in the twisted ropes.

Can a twisted rope reversibly store nanomechanical energy?

Here we produced SWCNT ropes wrapped in thermoplastic polyurethane elastomers, and demonstrated experimentally that a twisted rope composed of these SWCNTs possesses the remarkable ability to reversibly store nanomechanical energy.

How does a twisted SWCNT rope store energy?

Unlike a bundle of carbon fibres consisting of irregular graphitic nanoribbons that store energy during stretching, four different channels store energy in a twisted SWCNT rope 15, 16, 17. When the rope is twisted, each strand is subjected to stretching, twisting, compression and bending.

How do you calculate energy storage in twisted ropes?

Using this expression, the energy storage in twisted ropes can be calculated by first minimizing E/N with respect to these strains, taking into account the interrelation between them, as given by Eqs. (A1) and (A2) in the Appendix. The energy per atom can then be converted to the total gravimetric energy density J using J (E/N