Determining β in the L-Shaped Rod Problem

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In summary, the position of the L-shaped rod is controlled by a cable attached at point B. The angle, β, in terms of θ can be determined using the equation β = tan-1(\frac{0.24sinθ - EF}{0.24cosθ+0.32}). However, the value of EF is still unknown and will depend on the pulley radius, which is not given. Therefore, the beta angle will also be a function of the pulley radius, r.
  • #1
aaronfue
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Homework Statement



The position of the L-shaped rod shown is controlled by a cable attached at point B. Determine the angle, β, in terms of θ.

The Attempt at a Solution



From the FBD attached, I was able to get:

β = tan-1([itex]\frac{0.24sinθ - EF}{0.24cosθ+0.32}[/itex])

How can I determine what EF is? Is it possible to get an actual number? FG = 0.160
 

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  • #2
Is the beta angle supposed to be the angle the cable BE makes to the vertical?

Then I think there is something not quite right about your diagram ...
F is vertically above the pivot of the beam and level with the top of the pulley?
It is 160mm horizontally from F to the center of the pulley.

It looks like you'll need the diameter of the pulley.
 
  • #3
aaronfue said:
FG = 0.160.
aaronfue: FG is not 160 mm. FG is simply AB*sin(theta), whereas EF = 160 mm.

Here are my current thoughts. Theta can be any value; it is given. Given theta, then I think beta can be any value, depending on the pulley radius. You are given the pulley axle horizontal location, which is EF = 160 mm.

But are you given the pulley radius? If not, I am currently thinking beta will also be a function of pulley radius, r.
 

FAQ: Determining β in the L-Shaped Rod Problem

What is the L-Shaped Rod Problem?

The L-Shaped Rod Problem is a mathematical problem that involves determining the value of β, which is the angle of rotation of a rod that is fixed at one end and has a load applied at the other end. The goal is to find the value of β that will result in the minimum displacement of the rod.

Why is determining β important?

Determining β is important because it allows us to find the optimal angle of rotation for the rod in order to minimize displacement. This can have practical applications in engineering and design, as it can help determine the most efficient and stable position for a structure or object under a load.

What factors affect the value of β in the L-Shaped Rod Problem?

The value of β is affected by the length and stiffness of the rod, as well as the magnitude and direction of the applied load. Other factors such as material properties and boundary conditions may also play a role in determining β.

How is β calculated in the L-Shaped Rod Problem?

There are various methods for calculating β in the L-Shaped Rod Problem, including analytical solutions, numerical methods, and experimental testing. The method used will depend on the specific problem and available resources.

Are there any real-world applications of the L-Shaped Rod Problem?

Yes, the L-Shaped Rod Problem has applications in structural engineering, where it can be used to determine the optimal angle of rotation for support beams and columns. It is also relevant in material science, where it can help understand the behavior of materials under different loading conditions.

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