mech dynamics 14.5 ws08b transient

8/12/2019 Mech Dynamics 14.5 WS08B Transient

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2012 ANSYS, Inc. March 28, 2013 1 Release 14.5

14.5 Release

Workshop 8B

Transient Analysis of a Gantry Crane

ANSYS MechanicalLinear and Nonlinear Dynamics


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GoalsThis workshop consists of a gantry crane assembly. The crane is rated

to carry a 5 tons weight. The purpose of this workshop is to compare

the full transient method versus the mode superposition method.

Support # 1

Support # 2

Support # 3

Support # 4


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AssumptionsWell assume supports # 1 to 3 are fixed in all direction, whereas

support # 4 is allowed to move in the x- direction.

A weight of 5 tons (50,000 N) is applied using remote force, and is

scoped to the middle of the horizontal beam.


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Project SchematicOpen the Project page.

From the Units menu verify: Project units are set to Metric (kg, m, s, C, A,N, V).

Display Values in Project Units is checked (on).


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. . . Project Schematic

Begin a new Workbench session and, from the

Project page, choose Restore Archive . . . and browse to the file WS08_Transient.wbpz

and Open (location provided by instructor).

When prompted, Save using the default

name in the same location as the archive file.


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In the Workbench Project and drag and drop a new transient analysis

from the toolbox onto the existing Model cell.


7/22 2012 ANSYS, Inc. March 28, 2013 7 Release 14.5

. . . Project Schematic In the Workbench Project and drag and drop a new transient analysis

from the toolbox onto the existing Solution cell of the Modal analysis

system.

The schematic should look like

this when this step is complete.



. . . Project Schematic Double click and rename both transient systems as follows:

(B): Full Transient Analysis

(C): MSUP Transient Analysis




1. From the Static Structural system double click

(or RMB > Edit) the Model cell.

2. When Mechanical opens, verify the units are

set to Metric (m, kg, N, s, V, A).

1.

2.



PreprocessingSince we will be using a remote force to model the hanging weight, lets define

a named selection at the location where the remote force will be scoped.

3. Highlight the Model branch in the tree.

4. Select the 2 faces shown below, RMB > Insert > named selection.

4.

3.


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. . . Preprocessing RMB and rename both transient systems in the tree as follows:


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. . . Preprocessing7. Highlight the Modal (A5)

branch in the tree.

8. Highlight the bottom faces ofsupports 1,2, and 3, RMB >Insert > Fixed Support.

9. Highlight the bottom face ofsupport # 4, RMB > Insert >

displacement. X = free, Y = 0.0, Z = 0.0

Support # 1

Support # 2

Support # 3

Support # 4


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10. Highlight the Full Transient Analysis(B5) branch, Analysis Settings

. . . Preprocessing


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12. Highlight the fixed support anddisplacement BCs under Modal (A5,

drag and drop in Full TransientAnalysis (B5)

13. Highlight the Full Transient Analysis(B5) branch, RMB > Insert > remoteforce.

. . . Preprocessing


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12. Under details of Remote Force

a. Scoping Method > Named Selection

b. Named Selection > Selection

X Coordinate = - 0.7135

Y Coordinate = 1.1

Z Coordinate = -4.3905

c. Define By > Components

. . . Preprocessing

a.

b.

c.


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d. Y Component> Tabular

e. Fill in the table as shown

. . . Preprocessing

e.

d.


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13. Highlight the MSUP Transient Analysis(C5) branch, Analysis Settings

. . . Preprocessing


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14. Highlight the remote force under FullTransient Analysis (B5), drag and

drop in MSUP Transient Analysis (C5)

. . . Preprocessing


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15. Highlight the solution branch under FullTransient Analysis (B5),

RMB>Insert>Deformation>Directional.

. . . Preprocessing


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16. Highlight the Directional Deformationunder Full Transient Analysis (B5),

drag and drop in MSUP TransientAnalysis (C5)

. . . Preprocessing


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17. Highlight the both displacementoutput

18. Click the New Chart and Table Icon

19. In the Details of the Chart, set theOutput Quantities as shown.

20. Solve

. . . Preprocessing

18.

17.

19.


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. . . Preprocessing

mech dynamics 14.5 ws08b transient

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