A Pendulum should really work

[DreamThinkBuild]

Hi Vidar,

The height drop was around 2" to 3". The piezo was on a wood table so some of the force was dampened. The pulse width is short I didn't take the measurement on the time but it was less then 20msec. I noticed that if you take a small wheel and push it down with a lot of force while running over the piezo, it generates a longer pulse but with a much lower amplitude.

[Dbowling]

Just a thought.
I know Matt Jones has been mighty successful with his bouncer project, getting it to generate electricity. Take a look at it in combination with what you have been discussing here.
http://www.youtube.com/watch?v=LRkBamhlK8w
In particular, I am thinking about the point on the bouncer that travels up and down, and how that could be made to strike or compress the material you are discussing. Hope that this is worth considering and not a waste of your time.

[Low-Q]

Just a thought.
I know Matt Jones has been mighty successful with his bouncer project, getting it to generate electricity. Take a look at it in combination with what you have been discussing here.
http://www.youtube.com/watch?v=LRkBamhlK8w
In particular, I am thinking about the point on the bouncer that travels up and down, and how that could be made to strike or compress the material you are discussing. Hope that this is worth considering and not a waste of your time.

The inventor explains that the rotor speeds up when trying to stop the bouncing. The rotor will speed up when you try to stop the bouncing because when it bounce that much, the efficciency are very low due to the non circular movement of the rotating weight. The weight follows then an oval shape which means constantly acceleration and retardation of the weights during each revolution. Stopping the bounce will let the weight follow a circular path and rotate freely. He use this bouncing to generate energy, but this energy is a direct relationship with the energyloss he gets when the machine bounce - also with very low efficiency I would guess.

Taken my preliminary knowledge into account: If he had applied a piezoelectric device, which was fixed to the rig, and also fixed to the table, so no bouncing occoured, he would get the best efficiency and maximum output of the piezo without loosing energy due to bouncing. Only the difference in force applied to the piezo would be the energy source. And a stand still, but yet varying force, does not require energy - because energy are force times distance. If distance are zero, there is no energy input, but still energy output from the piezo due to the difference in applied force.

So, if anyone wants to build a bouncing machine, consider the low efficiency the bouncing applies to the machine. Make it "rock solid", then I believe one can make the most efficient machine.

Vidar

[Low-Q]

Hi Vidar,

The height drop was around 2" to 3". The piezo was on a wood table so some of the force was dampened. The pulse width is short I didn't take the measurement on the time but it was less then 20msec. I noticed that if you take a small wheel and push it down with a lot of force while running over the piezo, it generates a longer pulse but with a much lower amplitude.

I did read this post once more, and realized you got a very good idea! Imagine a ball bearing-like rotor with spring loaded balls or small wheels which is pushed outward to the outer ring. Inside this outer ring we apply an array of piezos, and thet those piezos be the surface for the balls to roll on. If the surface are very smooth, the rolls would roll freely even if they applies great force to the piezos. Then the energy we get out from the piezos can run a small brushless motor which rotate the rotor... What do you think?

Vidar

[Dbowling]

I think if you talked to Matt about the bouncer, you would be very surprised by the energy it produces. I have met with him in person, and have been following his progress for a while. He is not the only one going down this path. I don't believe he would claim overunity, but he gets quite a bit from the coil collapse and the unusual rotation doesn't use as much energy as a standard rotating wheel, from what I understand. I could be wrong. With the addition of the voltage produced by piezos, it might be very interesting. I am going to mention it to him as well.