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Re: Differential Eq.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106513] Re: Differential Eq.
  • From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
  • Date: Fri, 15 Jan 2010 03:17:45 -0500 (EST)
  • Organization: Inst. f. Mechanics II, TU Vienna
  • References: <himsn6$j93$1@smc.vnet.net>

Jamil Ariai <j_ariai at hotmail.com> writes:

> Hi All,
>
>
>
> Can anybody kindly tell me how I can solve the following differential equation, with (x[0], x'[0]) = (0, 0):
>
>
>
> x''[t] -x[t] + g[t] = 0,
>
>
>
> where
>
>
>
> g[t] = b*v, for x'[t] > v,
>
> g[t] = b*(x'[t]-u), for Abs[x'[t]-u] < v, and
>
> g[t] = -b*v.
>
>
>
> Take b = 5, v = 0.2, and u = 0.1. Draw x[t] vs t, and x'[t] vs x[t].
>
>
>
> Thanks.
>
>
>
> J. Ariai
>  		 	   		 
>
Hello,
that looks much like a homework assignment. Who gets the credits?
What have you tried so far?
Alois

-- 
Alois Steindl,                           Tel.: +43 (1) 58801 / 32558      
Inst. for Mechanics and Mechatronics     Fax.: +43 (1) 58801 / 32598
Vienna University of Technology,         A-1040 Wiedner Hauptstr. 8-10   


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