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26/02/13 In this small talk we will consider the slider mechanism as shown in Figure 1, which consists of two rigid links and a piston,

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ADAMS Labs: Slider Mechanism

We will consider the slider mechanism as shown in Figure 1, which consists of a rigid link and two pistons, all connected by frictionless revolute joints. The pistons slide on two

frictionless grounded planes that are perpendicular and parallel to the horizontal axis respectively.

In the slider mechanism shown in Figure 1, both ends of the bar AB are connected at the revolute joints A and B, the centers of the mass of the pistons. This results in a general

planar motion of the bar AB, and translational motions of the pistons on the grounded planes EC and ED. The bar and pistons, with lengths and width as shown in the figure,

have identical thickness 20 cm (along the joint axes), and are made of steel (density: 7.8103 kg/m3). Initially, link AB rests at a position shown in Figure 1 (You should put O

at the coordinate origin).

Simulation I:

1. Angular velocity of the bar AB when degree

2. x- andy- components of reaction force at joint A

Simulation II:

A constant force of 4000 N pointing to the left is applied on the piston on the horizontal plane. Redo the simulation for questions 1 and 2 in Simulation I.

Figure 1. The slider mechanism

Solution:

The printout of the model is given in Figure 2.

Figure 2. The model printout of the slider-mechanism

Simulation I:

The angle of phi as a function of time is plotted in Figure 3. By using tracking tool, we can locate the time point corresponding to phi=60 degree, which is 0.84 s. The angular

velocity of Bar AB as a function is plotted in Figure 4, from which we can find the angular velocity is 81 degree/second at 0.84 s.

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26/02/13 In this small talk we will consider the slider mechanism as shown in Figure 1, which consists of two rigid links and a piston,

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Figure 3. The angle of phi as a function of time Figure 4. The angular velocity of Bar AB as a function of time

x- andy- components of reaction force at joint A are plotted in Figures 5 and 6.

Figure 5. Thex-component of reaction force at joint A as a function of time Figure 6. They-component of reaction force at joint A as a function of

Simulation II:

The model printout with applied force is shown in Figure 7.

Figure 7. The model printout of the slider-mechanism with a constant force of 4000 N applied on the bottom piston

The angle of phi as a function of time is plotted in Figure 8. By using tracking tool, we can locate the time point corresponding to phi=60 degree, which is 1.056 s. The angular

velocity of Bar AB as a function is plotted in Figure 9, from which we can find the angular velocity is 69.5 degree/second at 1.056 s.

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26/02/13 In this small talk we will consider the slider mechanism as shown in Figure 1, which consists of two rigid links and a piston,

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Figure 8. The angle of phi as a function of time Figure 9. The angular velocity of Bar AB as a function of time

x- andy- components of reaction force at joint A are plotted in Figures 10 and 11.

Figure 10. Thex-component of reaction force at joint A as a function of time Figure 11. They-component of reaction force at joint A as a function o

I also provide the correct model for solution. Clickhere (slider mechanism), you can download it.

To check the solution model, right click any part (such as link, joint, torque or even the figure) that you are interested in and choose info. A window will pop up showing

you its setting information.

Created by Yi Wang, Mechanical Engineering, Carnegie Mellon University, 11/8/2004

http://www.andrew.cmu.edu/org/me-tutorials/Dynamics_Adams/ADAMS%20Labs%20slider_files/slider.bin