Chapter 5: Problem 100
Using MATLAB, find the roots of the equation \(x^{4}-32 x^{3}+244 x^{2}-20 x-1200=0\).
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Chapter 5: Problem 100
Using MATLAB, find the roots of the equation \(x^{4}-32 x^{3}+244 x^{2}-20 x-1200=0\).
These are the key concepts you need to understand to accurately answer the question.
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An airfoil of mass \(m\) is suspended by a linear spring of stiffness \(k\) and a torsional spring of stiffness \(k_{t}\) in a wind tunnel, as shown in Fig. \(5.43 .\) The C.G. is located at a distance of \(e\) from point \(O\). The mass moment of inertia of the airfoil about an axis passing through point \(O\) is \(J_{0}\). Find the natural frequencies of the airfoil.
Find the natural frequencies of the system shown in Fig. 5.6 for \(k_{1}=300 \mathrm{~N} / \mathrm{m}\), \(k_{2}=500 \mathrm{~N} / \mathrm{m}, k_{3}=200 \mathrm{~N} / \mathrm{m}, m_{1}=2 \mathrm{~kg},\) and \(m_{2}=1 \mathrm{~kg} .\)
The differential equations of motion for a two-degree-of-freedom system are given by $$ \begin{array}{l} a_{1} \ddot{x}_{1}+b_{1} x_{1}+c_{1} x_{2}=0 \\ a_{2} \ddot{x}_{2}+b_{2} x_{1}+c_{2} x_{2}=0 \end{array} $$ Derive the condition to be satisfied for the system to be degenerate.
Figure 5.61 shows a \(2000-\mathrm{kg}\) car connected to a \(1000-\mathrm{kg}\) trailer by a flexible hitch having a stiffness of \(180 \mathrm{kN} / \mathrm{m}\). Assuming that both the car and the trailer can move freely on the roadway, determine the natural frequencies and mode shapes of vibration of the system.
Find and plot the response of the following two-degree-of-freedom system using MATLAB: $$ \left[\begin{array}{rr} 2 & 0 \\ 0 & 10 \end{array}\right]\left\\{\begin{array}{l} \ddot{x}_{1} \\ \ddot{x}_{2} \end{array}\right\\}+\left[\begin{array}{rr} 20 & -5 \\ -5 & 5 \end{array}\right]\left\\{\begin{array}{l} \dot{x}_{1} \\ \dot{x}_{2} \end{array}\right\\}+\left[\begin{array}{rr} 50 & -10 \\ -10 & 10 \end{array}\right]\left\\{\begin{array}{l} x_{1} \\ x_{2} \end{array}\right\\}=\left\\{\begin{array}{l} 2 \sin 3 t \\ 5 \cos 5 t \end{array}\right\\} $$ The initial conditions are \(x_{1}(0)=1, \dot{x}_{1}(0)=0, x_{2}(0)=-1,\) and \(\dot{x}_{2}(0)=0\)
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