mech-intro 13.0 ws06.2 prestrvib
TRANSCRIPT
WS6.2-1ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0November 2010
Introduction to ANSYSMechanical
Customer Training Material
Workshop 6.2
Pre-Stressed Vibration Analysis
Introduction to ANSYS Mechanical
WS6.2-2ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialGoals• Our goal is to simulate the modal response of the tension link (shown
below) in both a stressed and unstressed state. • Specifically, we will load the link with a 4000 N tensile load and
compare the natural frequency to that of the unloaded component.
Introduction to ANSYS Mechanical
WS6.2-3ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialProject Schematic1. Double click Static Structural in
the Toolbox to create a new system.
2. Drag/drop a “Modal” system onto the “Solution” cell of the static structural system.
2.
1.
Introduction to ANSYS Mechanical
WS6.2-4ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training Material
• When the schematic is correctly set up it should appear as shown here.
• The “drop target” from the previous page indicates the outcome of the drag and drop operation. Cells A2 thru A4 from system (A) are shared by system (B). Similarly the solution cell A6 is transferred to the system B setup. In fact, the structural solution drives the buckling analysis.
. . . Project Schematic
“Drop Target”
Introduction to ANSYS Mechanical
WS6.2-5ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training Material. . . Project Schematic• Verify:– Project units are set to “Metric (kg, mm, s, C, mA, mV).– “Display Values in Project Units” is checked (on).
Introduction to ANSYS Mechanical
WS6.2-6ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training Material. . . Project Schematic3. From the static structural system
(A), RMB the Geometry cell and “Import Geometry”. Browse to the file “Tension_link.stp”.
4. Double click the “Model” cell to open the Mechanical application.
3.
Introduction to ANSYS Mechanical
WS6.2-7ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialSetup5. Set the working Unit System:– Units > Metric (mm, kg, N, s, mV, mA)
6. Apply supports to the model (highlight “Static Structural” (A5): a. Highlight one of the inside faces of one washer
“RMB > Insert > Fixed Support”.b. Highlight the face on the rim of the other
washer “RMB > Insert > Frictionless Support”.
5.
b.
Fixed Support
Frictionless Supporta.
Introduction to ANSYS Mechanical
WS6.2-8ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialPreprocessing7. Apply tensile load to the model:
a. Orient the model as necessary and zoom in on the inside face of the washer where the frictionless support is applied to the rim.
b. “RMB > Insert > Force”.c. In the “Details of Force”, change to
“Components”d. Enter “4000” in the “Z” component
Magnitude field.• Note: depending on your choices for
supports the load may need to be defined as – 4000 N to put the rod in tension
c.
d.
a.
Force
Introduction to ANSYS Mechanical
WS6.2-9ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialAnalysis Settings8. Highlight the modal “Solution” branch (B6)
and Solve.
– When solution completes
9. Insert modal results:a. RMB in the timeline and “Select All”.b. RMB in the timeline and “Create Mode Shape
Results”.
10. RMB the Solution branch and “Evaluate All Results”.
Introduction to ANSYS Mechanical
WS6.2-10ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training MaterialPostprocessing11. Highlight various results to view displaced mode shapes.
Introduction to ANSYS Mechanical
WS6.2-11ANSYS, Inc. Proprietary© 2010 ANSYS, Inc. All rights reserved.
Release 13.0 November 2010
Customer Training Material… Postprocessing• This table illustrates the change in the first natural frequency as the
force is increased (note this table is for illustration only and is not part of the workshop).