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Re:整理了前面玩家的公式

Posted by dream2014 at 2013-05-02 10:40:27 on Problem 1045
In Reply To:整理了前面玩家的公式 Posted by:angeldust at 2011-12-02 10:15:23
> 公式推导:
> V2=I.R=C.R.d/dt(Vs*cos(Wt)-Vr*cos(Wt+B))=Vrcos(wt+B)
> 
> C.R.W.(Vr.sin(wt+b)-Vs.sin(wt))=Vr*cos(wt+b)
> 
> 令t=0化简得:   tan(b)=1/(C.R.W)-------------(1)
> 令wt+b=0化简得:Vr=C.R.W.Vs*sin(b)------------(2)
>                 sinb=sqrt(tanb^2/(1+tanb^2))---(3)
> 
>               设a=C.R.W
> 由(1),(2),(3)得:   Vr=a.Vs/sqrt(1+a^2)).

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