diff --git a/latex/problems/problem-1.tex b/latex/problems/problem-1.tex index e69de29..0bfbf8c 100644 --- a/latex/problems/problem-1.tex +++ b/latex/problems/problem-1.tex @@ -0,0 +1,16 @@ +\section*{Problem 1} +We are studying the one-dimentional buckling beam, which can be described by the equation +\begin{align*} + \gamma \frac{d^{2} u(x)}{dx^{2}} &= -F u(x) & \rightarrow & & \frac{d^{2} u(x)}{dx^{2}} &= - \frac{F}{\gamma} u(x) \\ +\end{align*} +where $\gamma$ is a constant determined by the material of the beam. We want to scale the equation, that is we want to scale by the x-value of the beams endpoint $x=L$. +Scaling will result in a dimensionless variable $\hat{x} = \frac{1}{L}$. +% +\begin{align*} + \frac{d^{2}}{dx^{2}} &= \frac{d}{dx} \frac{d}{dx} = \bigg( \frac{d\hat{x}}{dx} \frac{d}{d\hat{x}} \bigg) \bigg( \frac{d\hat{x}}{dx} \frac{d}{d\hat{x}} \bigg) & \text{where we have used } \frac{d\hat{x}}{dx} \frac{d}{d\hat{x}} = \frac{d}{dx} \frac{d\hat{x}}{d\hat{x}} \\ + &= \bigg( \frac{1}{L} \frac{d}{d\hat{x}} \bigg) \bigg( \frac{1}{L} \frac{d}{d\hat{x}} \bigg) = \frac{1}{L^{2}} \frac{d}{d\hat{x}^{2}} & \text{where } \hat{x} \equiv \frac{x}{L} \text{ and } \frac{d\hat{x}}{dx} = \frac{1}{L} \\ +\end{align*} +Now we insert the expression into the original equation +\begin{align*} + \frac{d u(\hat{x})}{d\hat{x}^{2}} &= - \frac{F L^{2}}{\gamma} u(\hat{x}) \\ +\end{align*} \ No newline at end of file diff --git a/latex/problems/problem-2.tex b/latex/problems/problem-2.tex index e69de29..208f6c2 100644 --- a/latex/problems/problem-2.tex +++ b/latex/problems/problem-2.tex @@ -0,0 +1,2 @@ +\section*{Problem 2} + diff --git a/latex/problems/problem-3.tex b/latex/problems/problem-3.tex index e69de29..4593bff 100644 --- a/latex/problems/problem-3.tex +++ b/latex/problems/problem-3.tex @@ -0,0 +1 @@ +\section*{Problem 3} \ No newline at end of file diff --git a/latex/problems/problem-4.tex b/latex/problems/problem-4.tex index e69de29..38ac211 100644 --- a/latex/problems/problem-4.tex +++ b/latex/problems/problem-4.tex @@ -0,0 +1 @@ +\section*{Problem 4} \ No newline at end of file diff --git a/latex/problems/problem-5.tex b/latex/problems/problem-5.tex index e69de29..e19b782 100644 --- a/latex/problems/problem-5.tex +++ b/latex/problems/problem-5.tex @@ -0,0 +1 @@ +\section*{Problem 5} \ No newline at end of file diff --git a/latex/problems/problem-6.tex b/latex/problems/problem-6.tex index e69de29..8357158 100644 --- a/latex/problems/problem-6.tex +++ b/latex/problems/problem-6.tex @@ -0,0 +1 @@ +\section*{Problem 6} \ No newline at end of file