A computational bow-spring model as a Energy Storage Vessel.
Date Issued: 2011
Abstract:
Bow-springs find few applications in industry. Principally, they are used in archery. In addition, they have found some use in a compression-spring mode in the field of biomechatronics, to emulate elastic human legs. The mechanical behavior (characterized by deflected shape and deformation force) is difficult to model, because internal forces and moments and the geometry are both unknown. The only closed-form solutions to such systems are relatively useless to a mechanical engineer. This work comprises an iterative model developed in MATLAB that computes the mechanical behavior of buckled beam (or bow-spring) sections, over a range of parameters and geometries, to be used in the development and testing of compression bow-springs as parallel loading systems to the human leg.
Description: Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2011."May
So this is unknown territory. What can we build on to get energy out in the world that can power a cooking stove for a day?
My fork in the road is four way. 1. Stick to
Conventional spring technology. 2. Track nanotubes (slow in development). 3. Review the flywheel application. 4. Look at this emerging interest in composite bow-spring application.
The decision will make or break the stove for millions of people. I want something NOW to hit the market with. Help me sort this out.
Abstract:
Bow-springs find few applications in industry. Principally, they are used in archery. In addition, they have found some use in a compression-spring mode in the field of biomechatronics, to emulate elastic human legs. The mechanical behavior (characterized by deflected shape and deformation force) is difficult to model, because internal forces and moments and the geometry are both unknown. The only closed-form solutions to such systems are relatively useless to a mechanical engineer. This work comprises an iterative model developed in MATLAB that computes the mechanical behavior of buckled beam (or bow-spring) sections, over a range of parameters and geometries, to be used in the development and testing of compression bow-springs as parallel loading systems to the human leg.
Description: Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2011."May
So this is unknown territory. What can we build on to get energy out in the world that can power a cooking stove for a day?
My fork in the road is four way. 1. Stick to
Conventional spring technology. 2. Track nanotubes (slow in development). 3. Review the flywheel application. 4. Look at this emerging interest in composite bow-spring application.
The decision will make or break the stove for millions of people. I want something NOW to hit the market with. Help me sort this out.
Replies
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Ramani AswathThe devil as always is in the details. Mechanical energy storage has one of the lowest energy densities. While batteries of various kinds have energy densities between 1.2 to 3 MJ/Litre, a clock spring has only 0.0006 MJ/Litre. Not practical for the intended application of cooking after converting to electricity.
Energy Density Extended Reference Table -
Don RossHow does composite fibers fit into the the devils details? Can this be a new application for a workable energy storage vessel? While I did see a video of a real nanotube spring about one inch in length working. That's a long ways off to being useful. It may be the only answer eventually but I just feel like we're missing something. Call it a hunch. I am just not ready to give up. I've seen to many times in my career where they say at a later date, oops we were wrong, sorry. Look at what they are saying about cold fusion now after putting the gentleman down. Then 20 yrs later they said oops. He said he didn't have it to start the research all over. They wore him out in their attacks on his ideas.
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Ramani Aswath
Cold Fusion is still under a cloud. It is still called a hypothetical nuclear reaction.Don RossLook at what they are saying about cold fusion now after putting the gentleman down.
The process nearest to comercialization appears to be compressed air at about 4500 psi pressure. Even this requires access to powered compressors for refilling. Hence not too well suited to remote locations. -
Don Rosshmmmmm
You are reading an archived discussion.
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