Spanish experiment

[VGB]

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

[Merlin]

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

[VGB]

Yes Merlin it is damping

regards

Vince

[VGB]

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

[gordonjudd]

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

[VGB]

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

[gordonjudd]

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

[Walter]

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