Reply To: Initial Velocity Generation

[valerym.m5]

 

 

Dear colleagues,

I offer you two models that demonstrate “oddities” that I could not understand.

I will be glad if you write your assumptions… advice…. comments…

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Model
STYP-2_Relax.key
Link to the model:
https://drive.google.com/file/d/1P3C9CnTEGN145BxeU_X8ALUofHXnlTHp/view?usp=sharing

The initial speed of the cargo is set: -1000 mm per second

The cargo moves down.

As the calculation results show, the load receives a real initial speed in the calculation: -2594.6645508 mm per second
during the rise time: 0.00009155 sec – see below

Vy.txt
3.6099996948e+02 0.0000000000e+00
3.6100009155e+02 -2.5946645508e+03
3.6100531006e+02 -2.5946645508e+03

======================
Model
No_Relax_1.222e-4-1000mm_0_023sec.key
link to the model :
https://drive.google.com/file/d/1eOWIbv6e2wMkJ7HqZMFYVccMiwD1LyFJ/view?usp=sharing

The initial velocity of the cargo is set: -1000 mm per second

The cargo moves up.

Curveplot
Nodal History
Time
Y-velocity
Node no.
222980 #pts=266
* Minval= -1.0000000000e+03 at time= 0.0000000000
* Maxval= 3.7985620117e+03 at time= 10.0000991821
9.9999990463e+00 0.0000000000e+00
1.0000099182e+01 3.7985620117e+03
1.0001098633e+01 3.7985620117e+03

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List of questions I wanted to would like to get answers:

1. why, when setting one “initial” speed – 1000 mm per second,
in the first model – the cargo moves down, and in the second model – the cargo moves up?

2. why, when setting one “initial” speed – 1000 mm per second,
in the first model – the actual speed of the cargo according to calculations = - (MINUS) 2594.6645508 mm per second, 
and in the second model – the actual speed of the cargo according to calculations = + (PLUS) 3798.5620117  mm per second?

3. Why do the above “initial” speeds reach constant values ​​in different times?