[PD] msd change mass of mass

[cyrille henry]

marius schebella a écrit :
> thanks, cyrille, I did not know unpack~. also using "until" to loop 64 
> times at once (in the same logical time) is much easier coding. and 
> since one vector of 64 samples is always seen as one unit, this should 
> not make a difference in cpu load distribution.
> did you experience a performance difference between the unpack~ and the 
> tabplay~ solution?
i was expecting a deference, but i did not see one.
both are 10 (or more) time slower than pmpd~ for the same physical model.

cyrille

> marius.
> 
> cyrille henry wrote:
>> hello,
>> sorry, i don't have time, i'm not at home.
>> so it's a short answer.
>>
>> I try 2 other way to use msd as an audio generator.
>> it's not very efficient either.
>>
>> i think it should not be very difficult to make a msd~ external. 
>> anyway, for this aplication, pmpd~ external should be easier to use.
>>
>> there is no message to change the mass in msd, because equations are 
>> linear. i.e mass=1, K=0.1, D=0.1, F=0.1 is the same than mass=10, 
>> K=1,D=1,F=1:
>>
>> ++
>> c
>> marius schebella a écrit :
>>> one more.
>>> not at all cpu-friendly but a real msd.
>>> m.
>>>
>>> Andy Farnell wrote:
>>>>
>>>>
>>>> You're a hero Chuck. This tallys well with the equations in Perrys 
>>>> book.
>>>> What I was missing is the step where you get the transfer function.
>>>>
>>>>
>>>> I made (attached) a little test rig. What isn't looking right is the 
>>>> underdamped
>>>> behaviour. I was expecting to see a decaying oscillation around the top
>>>> point. Maybe my test has errors.
>>>>
>>>> a.
>>>>  
>>>>
>>>>
>>>>
>>>> On Sat, 15 Mar 2008 19:16:29 -0500
>>>> "Charles Henry" <czhenry at gmail.com> wrote:
>>>>
>>>>>>  Note, when c goes to 0, we get a harmonic oscillator at angular
>>>>>>  frequency w=k/m rad/sec, which is correct.  When we increase the
>>>>>>  damping, we get terms of e^(-0.5*c/m*t) which damps the solution.
>>>>> made a typo here:
>>>>>
>>>>> angular frequency w=sqrt(k/m) rad/sec
>>>>> and f=sqrt(k/m)/2pi Hz
>>>>>
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