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Spanish experiment

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guest
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Spanish experiment

#141

Post by guest » Sun Feb 10, 2013 2:29 pm

Just for interest sake, a comparison in Dynamic Amplification Factors:

Image
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IANACI - There’s no such thing as absolutes

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Merlin
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Spanish experiment

#142

Post by Merlin » Sun Feb 10, 2013 2:36 pm

Hi Vince

Can you please remind us what zeta is: a dampening factor?
In Lincast the ratio (I hope we speak of the same thing) is in cell D42.

Merlin
Fly rods are like women, they won't play if they're maltreated
Charles Ritz, A Flyfisher's Life

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Spanish experiment

#143

Post by guest » Sun Feb 10, 2013 2:50 pm

Yes Merlin it is damping

regards

Vince
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Spanish experiment

#144

Post by guest » Sun Feb 10, 2013 2:57 pm

Merlin
Notice the effect of damping on the natural frequency! It decreases from its undamped value by a factor of 1 − α2.
Dynamic Systems

The hard stop pushes the damping towards 0 and increases the damped frequency.

regards

Vince
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IANACI - There’s no such thing as absolutes

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gordonjudd
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Spanish experiment

#145

Post by gordonjudd » Tue Feb 12, 2013 3:15 pm

Grunde,
I hope you can give your view of why the spring produces a peak acceleration force on the brick that is nearly twice as large as the force produced by the string.

As noted in the other thread:
Grunde thanks for pointing out my error. So how do you think about the lag in the deflection of the spring for an an applied acceleration (not force) change to the spring?

In Aitor's experiment wouldn't the initial acceleration force on the lead mass be .49 N while the initial spring force would be zero?

How do you explain the force increase that is related to the the overshoot in the deflection of the spring as compared to the force from the string? That is the phenomena that most readers do not understand, and something I am not able to explain.
Thanks for taking the time to explain the overshoot phenomena and its impact on the acceleration of the line in casting.

Gordy

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Spanish experiment

#146

Post by guest » Tue Feb 12, 2013 3:43 pm

gordonjudd wrote:Grunde,
I hope you can give your view of why the spring produces a peak acceleration force on the brick that is nearly twice as large as the force produced by the string.
Gordy

I have seen you use the term "acceleration force" before, what does it mean?

Vince
Bright but shite

IANACI - There’s no such thing as absolutes

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gordonjudd
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Spanish experiment

#147

Post by gordonjudd » Tue Feb 12, 2013 6:33 pm

I have seen you use the term "acceleration force" before, what does it mean?
Vince,
In this case it refers to the f=-kx force from the spring that is providing the force that causes the brick mass to accelerate. i.e. f_spring=mass_brick*a_brick so a_brick=f_spring/mass_brick.
Gordy

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Walter
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Spanish experiment

#148

Post by Walter » Tue Feb 12, 2013 7:31 pm

gordonjudd wrote:
I have seen you use the term "acceleration force" before, what does it mean?
Vince,
In this case it refers to the f=-kx force from the spring that is providing the force that causes the brick mass to accelerate. i.e. f_spring=mass_brick*a_brick so a_brick=f_spring/mass_brick.
Gordy
Gordy - I'm going to blatantly plagiarize Magnus because he said it so well:

I have no idea what you just said :)
"There can be only one." - The Highlander. :pirate:

PS. I have a flying tank. Your argument is irrelevant.

PSS. How to generate a climbing loop through control of the casting stroke is left as a (considerable) exercise to the reader.

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