Presentation on theme: "GUI familiarity level required: Higher"— Presentation transcript:
1 GUI familiarity level required: Higher Crate on Incline Plane with Friction and Initial Velocity Estimated time required: 15 minGUI familiarity level required: HigherMSC.ADAMS 2005 r2
2 Topics Covered In this tutorial, you will learn how to: Add friction to a translational jointChange friction input forcesIf you have any difficulties, import the “Crate_on_incline_plane_level.cmd” file and proceed from pg 6If you have any difficulties, import the “Crate_on_incline_plane_15_deg.cmd” file and proceed from pg 7If you have any difficulties, import the “Crate_on_incline_plane_30_deg.cmd” file and proceed from pg 7
4 What You Should Accomplish If you are successful, you should end up with a ADAMS model that shows the effect of friction on a crate’s total distance traveled at different angles.
5 Creating the Model Start ADAMS. Create a new model. (Model Name = Crate_on_incline_plane, Units = mmks, Gravity = -y earth)Create crate part. (box, length = 20 cm, height = 15 cm, depth = 20 cm, mass = 50 kg, rename .Crate_on_incline_plane.CRATE)Create a translational joint with friction between crate and ground plane (mu kinetic = 0.4)Set the velocity initial condition for the crate to 7 m/s in the X-direction in the crate's coordinate frame.Create a measure for displacement of the crate.
6 Test Model Run simulation. (Duration = 2.0, Step Size = 0.01) Open full screen plot of displacement vs. time and observe the plot where displacement becomes constant (crate comes to rest).Record the time and displacement of this event.
7 Modify and Test ModelThe problem calls for the entire model to be rotated. Select both the crate and the translational joint and use the rotate tool to rotate them 15 degrees.Run another simulation. (Duration = 6.0, Step Size = 0.01)Repeat for a 30 degree slope. (Duration = 20.0, Step Size = 0.1)Observe effects of incline at each angle theta.
8 This is what your screen should look like when ModelThis is what your screen should look like whenyour model is complete.
9 Theoretical Solution ADAMS solution Results level surface: x = 6.24 m, t = 1.78 seconds15 degree slope: x = m, t = 5.59 seconds30 degree slope: crate does not come to restlevel surface:15 degree slope: x = m, t = 5.59 seconds30 degree slope: crate actually accelerates, never comes to restThe plot illustrates an exponential curve that shows that the crate will never come to rest
10 Topics Covered In this tutorial you learned how to: Add friction to a translational jointChange friction input forces
11 Best PracticesMake sure correct units are set to mmks.Make sure gravity is on.Check mass of crate to make sure it is correct. It may need to be set manually.Check dimensions of parts.Make sure the initial velocity is applied in the x direction relative to the crate and not ground.Make sure the measures are set correctly. After model is rotated, displacement will be in both the x and y direction, so measure the total magnitude.Make sure the plot is displaying the correct set of results.Make sure there are enough output steps to observe the effect at each angle setting.
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