How do I find equilibrium points of a partial differential equation?












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How do i find the critical points of this fourth order differential equation.



begin{equation} Dleft(frac{d^4w}{dx^4}+frac{d^4w}{dy^4}+frac{d^4w}{dz^4}right)+(rho_m-rho_c)gw=q-Pleft(frac{d^2w}{dx^2}+frac{d^2w}{dy^2}+frac{d^2w}{dz^2}right). label{bilaplaciano31} end{equation}



D, P, q, $rho_m$, $rho_c$, g are constants.



The boundary conditions are free.



Does anyone know how to get all the critical values for this problem? Thanks.










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  • 1




    $begingroup$
    What have you tried so far?
    $endgroup$
    – user3482749
    Jan 10 at 16:00










  • $begingroup$
    I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
    $endgroup$
    – carlos gomez
    Jan 10 at 16:19


















0












$begingroup$


How do i find the critical points of this fourth order differential equation.



begin{equation} Dleft(frac{d^4w}{dx^4}+frac{d^4w}{dy^4}+frac{d^4w}{dz^4}right)+(rho_m-rho_c)gw=q-Pleft(frac{d^2w}{dx^2}+frac{d^2w}{dy^2}+frac{d^2w}{dz^2}right). label{bilaplaciano31} end{equation}



D, P, q, $rho_m$, $rho_c$, g are constants.



The boundary conditions are free.



Does anyone know how to get all the critical values for this problem? Thanks.










share|cite|improve this question









$endgroup$








  • 1




    $begingroup$
    What have you tried so far?
    $endgroup$
    – user3482749
    Jan 10 at 16:00










  • $begingroup$
    I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
    $endgroup$
    – carlos gomez
    Jan 10 at 16:19
















0












0








0





$begingroup$


How do i find the critical points of this fourth order differential equation.



begin{equation} Dleft(frac{d^4w}{dx^4}+frac{d^4w}{dy^4}+frac{d^4w}{dz^4}right)+(rho_m-rho_c)gw=q-Pleft(frac{d^2w}{dx^2}+frac{d^2w}{dy^2}+frac{d^2w}{dz^2}right). label{bilaplaciano31} end{equation}



D, P, q, $rho_m$, $rho_c$, g are constants.



The boundary conditions are free.



Does anyone know how to get all the critical values for this problem? Thanks.










share|cite|improve this question









$endgroup$




How do i find the critical points of this fourth order differential equation.



begin{equation} Dleft(frac{d^4w}{dx^4}+frac{d^4w}{dy^4}+frac{d^4w}{dz^4}right)+(rho_m-rho_c)gw=q-Pleft(frac{d^2w}{dx^2}+frac{d^2w}{dy^2}+frac{d^2w}{dz^2}right). label{bilaplaciano31} end{equation}



D, P, q, $rho_m$, $rho_c$, g are constants.



The boundary conditions are free.



Does anyone know how to get all the critical values for this problem? Thanks.







ordinary-differential-equations






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Jan 10 at 15:59









carlos gomezcarlos gomez

11




11








  • 1




    $begingroup$
    What have you tried so far?
    $endgroup$
    – user3482749
    Jan 10 at 16:00










  • $begingroup$
    I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
    $endgroup$
    – carlos gomez
    Jan 10 at 16:19
















  • 1




    $begingroup$
    What have you tried so far?
    $endgroup$
    – user3482749
    Jan 10 at 16:00










  • $begingroup$
    I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
    $endgroup$
    – carlos gomez
    Jan 10 at 16:19










1




1




$begingroup$
What have you tried so far?
$endgroup$
– user3482749
Jan 10 at 16:00




$begingroup$
What have you tried so far?
$endgroup$
– user3482749
Jan 10 at 16:00












$begingroup$
I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
$endgroup$
– carlos gomez
Jan 10 at 16:19






$begingroup$
I solve the equation with finite differences placing a sinusoidal load distribution, obtaining an approximate solution. I also thought about finding the critical values of begin{equation} Dw''''+(rho_m-rho_c)gw=q-Pw''. label{bilaplaciano31} end{equation} overleaf.com/read/hcpnbdcqctdh to simplify the problem but I'm not sure if it's okay
$endgroup$
– carlos gomez
Jan 10 at 16:19












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