ADAMS SLIDER-CRANK TUTORIAL

8/7/2019 ADAMS SLIDER-CRANK TUTORIAL

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ADAMS TUTORIAL

Piston/Crank/Driveshaft Assembly


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1.0 General Instructions

Underline Mouse click

CAPITALS Menu or Toolbar Heading

Bold Required selectionItalics User entered information

Start Adams

Log into any of the Windows 2000 workstations in the Wean cluster.

Start->All Programs->Class Software->Adams 12.0->AView->Adams View

In this window, Create a new model should be selected.

MODEL NAME->Valve{group-number} ->OK

*NOTE* This should be typed as one word, for example: Valve1 orValve21, depending on yourgroup number.


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2.0 Set Up the Drawing Environment

SETTINGS->Working Grid

Size: X = 250mm Y = 250mm

Spacing: X = 10mm Y = 10mm

WORKING GRID SETTINGS->OK

VIEW->Coordinate Window


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3.0 Enlarging the Main Window

MAIN TOOLBOX->Left ClickDynamic Pick.

Left Click top left corner of grid and Hold then Drag to bottom right corner of grid and Release

(This will enlarge the working area to fill the main window.)


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4.0 Define Material Properties

4.1 Change Properties of Steel

BUILD->MATERIALS->Modify

DATABASE NAVIGATOR->materials (double click)

MATERIALS->steel (double click)

MODIFY MATERIAL->Poissons Ratio=0.30

MODIFY MATERIAL->Density=(7750.0(kg/meter**3))

MODIFY MATERIAL->OK


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5.0 Create Crank CD

MAIN TOOLBOX->Left clickRigid Body: Link

LINK->Length (this should put a checkmark in the box)LINK->Length = (6.0cm)]

LINK->Width (this should put a checkmark in the box)

LINK->Width = (4.0cm)

LINK-> Depth (this should put a checkmark in the box)

LINK-> Depth = (2.5cm)

MAIN WINDOW

Click on the coordinate (120,0,0)

Click on the coordinate (60,0,0)

(colors of parts may vary)


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6.0 Create Crank BC

MAIN TOOLBOX->Left clickRigid Body: Link

LINK->Length = (15.0cm)

LINK->Width = (2.0cm)

LINK->Depth = (1.5cm)

(make sure boxes are still checked)

MAIN WINDOW

Click on PART_2.MARKER_2Click on the coordinate (-90,0,0)



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7.0 Create Piston

MAIN TOOLBOX->Right ClickRigid Body: LinkRIGID BODY->Cylinder

CYLINDER->Length (this should put a checkmark in the box)

CYLINDER->Length = (3.0cm)

CYLINDER->Radius (this should put a checkmark in the box)

CYLINDER->Radius = (4.3cm)

MAIN WINDOWClick on PART_3.MARKER_4Click on the coordinate (-200,0,0)



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7.1 Change Material to Aluminum

Right Click on the Cylinder

PART: PART4->Modify

MODIFY BODY->Material Type = aluminum

(make sure to just type aluminum in the space)

MODIFY BODY->Apply

(This should change the properties to those of aluminum like in figure below)

MODIFY BODY->OK


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8.0 Add Revolute Joints

8.1 Add Joint 1 (Crank CD to Ground)

MAIN TOOLBOX->Left ClickJoint: Revolute

MAIN WINDOW

Click on PART_2 (Crank CD)

Click on ground (anywhere in the open grid)

Click on PART_2.MARKER_1 (the upper right point of the Crank CD)


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8.2 Add Joint 2 (Crank CD to Crank BC)


MAIN WINDOW

Click on PART_2 (Crank CD)Click on PART_3 (Crank BC)

Click on PART_3.MARKER_3 (the intersection of Cranks CD and BC)

8.3 Add Joint 3 (Crank BC to Cylinder)


MAIN WINDOW

Click on PART_3 (Crank BC)

Click on PART_4 (the Cylinder)Click on PART_3.MARKER_4 (the intersection of Crank BC and the cylinder)


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9.0 Add Translational Joint

MAIN TOOLBOX->Right ClickJoint: RevoluteJOINT->Translational

MAIN WINDOWClick on PART_4 (the Cylinder)

Click on ground (anywhere in the open grid)

Click on PART_4.cm (near the center of the Cylinder i.e. (center of mass)

Click on the coordinate (0,0,0) (the arrow will point in the positive X-direction)


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10.0 Impose Motion on Joint 1

MAIN TOOLBOX->Left ClickRotational Joint Motion

CHARACTERISTIC->Speed = -4200d then hit the Enter key(This is equal to -4200deg/s which is the equivalent of 700rpm in the clockwise direction)

MAIN WINDOW

Click on JOINT_1 (the upper right portion of Crank CD)

10.1 Test Motion

MAIN TOOLBOX->Interactive Simulation Controls

**The simulation controls are featured below. To run a simulation, click , to stop, click

, and to reset a simulation, click .

Play simulation and 1) make sure piston moves linearly and 2) the crank rotates clockwise.

Reset the simulation before continuing


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11.0 Save and Print

11.1 Save Your Model

FILE->Select Directory (C:\Documents and Settings\userid)

FILE->Save Database

INFORMATION->OK(The model has been saved to the directory you chose)

11.2 Move Saved Data to Andrew File System

Start->Programs->Communications->KerbFTP

OPEN CONNECTION->Hostname = unix.andrew.cmu.edu ->Connect

Double left click the root directory on the left side of the bottom portion of your screen

Right click on the folder labeled Private

Left clickNew Directory then OK

In the dialog box type:ADAMS

Left clickOKand a dialog box should appear (257 MKD Command Successful)

Left clickOK

In the right portion of the bottom of your screen, the directory you just created should appear as a

folder.

Find the BIN file you just created on the local drive in the top portion of your screen.

(C:\Documents and Settings\userid\Valve{groupnumber}.bin)

Left click and drag this file to the ADAMS directory on the bottom screen.

Verify that the file is properly placed in the correct directory on you AFS space.

Close KerbFTP


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11.3 Print First Copy

FILE->Print (if in the Wean cluster, make sure to print at either Wean-8150 or Wean-8100)

(both printers are located in the hallway outside the cluster)

(it would be advised to make sure the printers are working)

11.4 Print at Different Angle

VIEW->PRE-SET->Iso

VIEW->RENDER MODE->Smooth Shaded

FILE->Print (Wean-8150 or Wean-8100)

11.5 Close Shop or Continue Going

If you have had enough, this is the end of the first portion and you may close ADAMS/View.There is no need to save again. At another time you may begin at step 12.0.

If you want to continue without closing ADAMS and finish up with the tutorial, disregard step12.0 and begin at 12.1


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12.0 Getting things started again

You should have a file saved on your AFS space in a folder called ADAMS and it should be

called Valve{groupnumber}.bin. Heres how to get it.

Start->Programs->Communications->KerbFTP

OPEN CONNECTION->Hostname = unix.andrew.cmu.edu ->Connect

Double left click the root directory on the left side of the bottom portion of your screen

Double left click on the folder labeled Private

Double left click the folder labeled ADAMS (your BIN file should be here)

On the local drive (the top portion of the page) go to C:\Documents and Settings\userid

Left click and drag your BIN file to this location on the C: drive

The location of your file should now be

C:\Documents and Settings\userid\Valve{groupnumber}.bin

Start Adams

Start->All Programs->Class Software->Adams 12.0->AView->Adams View

How would you like to proceed?->Open an existing database->OK

Select File->Valve{groupnumber}.bin->Open (your BIN file should be located under

C:\Documents and Settings\userid\Valve{groupnumber}.bin

12.1 Return to Front View

VIEW->PRE-SET->Front


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13.0 Simulate

13.1 Run Simulation


**The simulation controls are featured below. To run a simulation, click , to stop, click

, and to reset a simulation, click . Be sure to RESET the simulation between runs**

Run the simulation with an End Time of 0.2 and 100 Steps (this is for idle speed. You willrepeat this again with a different End Time which is specified later). Let the simulation stop on

its own.

Make sure to reset the simulation after it is finished. If for some reason you need to replay the

simulation, make sure to reset it.


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13.2 Set Measurement Parameters for Cylinder

Reset Simulation

Right Clickon the Cylinder

Left Click --MARKER: CM->Measure

POINT MEASURE->Characteristic = Translational Velocity (From Pull Down Menu)

POINT MEASURE->OK (A plot window should appear representing velocity of the cylinder)

Right Click the plot window (In any of the white area)

PLOT: SCHT1->Transfer to Full Plot


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DATA->RESULT SET->JOINT_3

DATA->COMPONENT->Fx

DATA->Add Curves (This adds a curve for the force at the Cylinder joint)

FILE->PRINT->also show Windows print dialog (check box)->OK(Wean-8150 or Wean-8100)

FILE->Close Plot Window

13.3 Set Measurement Parameters for Crank CD

Make sure simulation is reset.

Right Clickon the CRANK CD (Near the joint to CRANK BC)

Left Click --Marker: MARKER_2->Measure

POINT MEASURE->Characteristic = Translational Velocity (From Pull Down Menu)

POINT MEASURE->Component = mag

POINT MEASURE->OK(A plot window should appear)

Right Click the plot window (In any of the white area)PLOT: SCHT1->Transfer To Full Plot

FILE->PRINT->also show Windows print dialog (check box)->OK(Wean-8150 or Wean-8100)

FILE->Close Plot Window


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4.17171817

4.17171817

=

vvvv

13.4 Animation

MAIN TOOLBOX->Animation

This mode has similar controls to the simulation mode with one exception: -1 and +1

Keep the cylinder velocity plot open

Using the +1/-1 tools or the scrollbar under them, you can trace the velocities for each time step.

+1 will move the crank and piston one step in the positive time direction. Similarly, -1 willmove the system in the negative direction by 1 step. This will allow you to find estimated values

of velocity on the plot at different crank angles.

0, 90, 180, and 270 degrees are easy to visualize, but 60 degrees may be difficult to see. It will

be easier to calculate the time at which these angles occur. The angle is equal to (time)*(angular

velocity). Therefore, the time to get to 90 degrees in idle is (90deg)/(4200deg/s) = 0.0214

seconds.

Since there are 100 steps, each step will move the simulation by (End Time)/100. For idle the

end time is 0.2 seconds and for red-line the end time is 0.02 seconds. In addition, step 1 is for

time = 0 and step 101 is for time = (End Time). Heres an equation to know what time coincideswith what step: t = (tstep-1)*(End Time)/100 or tstep = t*100/(End Time)+1

The numbers you obtain for a time step numbers will probably not be whole numbers. You can

obtain a good estimate of the velocity by assuming that the path between each step is linear.

Therefore if you obtain a time step number of 17.4 from the equation above, you can estimate the

velocity by comparing it to the velocities at 17 (v17) and at 18 (v18):This method is called linear interpolation.


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13.5 End Simulation

Reset animation and close plot windows.

Back to simulation mode


Make sure simulation is reset

14.0 Modify Motion Characteristics

Right Click on the Motion Arrow (the big blue one)

Motion: MOTION_1->Modify

JOINT MOTION->Function(Time) = -33600.0d*time

(-33600.0d*time is equivalent to -33600deg/s = 5600rpm clockwise)

JOINT MOTION->OK

14.1 Repeat

Repeat measurements and plots as in Part 13 but CHANGEEnd Time in the simulation mode to

0.02 and keep Steps at 100.

14.2 If you finished the measurements and plots for both speeds, you may now close

ADAMS/View. There is no need to save.

ADAMS SLIDER-CRANK TUTORIAL

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