bab 11 dynamics output processing

7/27/2019 Bab 11 Dynamics Output Processing

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Chapter XI Dynamic Output Processing

Training on Caesar II1

BAB XI

DYNAMIC OUTPUTPROCESSING


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Dynamic Processor

Frequency/Modal results

Harmonic results

Spectrum results, Time History results

Output :

11.1. Entry into the Processor


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1. Displacement

This report gives the magnitude of the displacement for each

load case. For spectral results, due to summing methodology,

all displacement values in this report are positive. For time

history analysis, the values are correctly signed.

2. Restraint Forces

11.2. Report Type


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3. Local Force

This report gives elemental forces and moments in the element local a-b-c

coordinate system. The a-b-c coordinate system is defined as follows:

For straight pipe not connected to an intersection:

a is along the element axis (i.e. perpendicular to the pipe cross-section)

b is axY, unless a is vertical and then b is along X

c is axb.

For bends and elbows, and for each segment end:

a is along the element axis (i.e. perpendicular to the pipe cross-section)

b is normal to the plane of the bend

c is axb

For intersections, and for each segment framing into the intersection: a is along the element axis (i.e. perpendicular to the pipe cross-section)

b is normal to the plane of the intersection

c is axb


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4. Global

Force

5. Stress


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6. Force/

Stress

7. Mass

Participation


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8. Cumulative Usage

Available

only whenthere are

one or

more

Fatigue

Stress

types

present.


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9. Natural Frequency

10. Modes Mass Normalized

11. Modes Unity Normalized

Calculated modal natural frequencies are reported in Hertz

and radians per second; period is reported in seconds.

A mass normalization procedure is used to compute valuedmagnitudes for mode shapes.

This report scales the largest displacement in the modeshape to 1.0, with all other displacements and rotations

scaled accordingly. This mode report is the easiest way to

get a feel for the shape of the mode.


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Example


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12. Inclu ded Mass Data

displays the percent of the total system mass/force included in the

extracted modes, and the percent of system mass/force included

in the missing mass correction (if any) for each of the individual

shocks of each of the dynamic load cases.

Indication of the accuracy of the total system response captured

by the dynamic model, with 100% being the difficult to achieveideal.

The repo rt :

Load Case, Shock Description, and direction cosines % Mass Included, shows the percentage of mass active in

each of the X, Y, and Z directions.

% Force Added% Force Active and subtracting from

100.


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13. Input Lis t ing

Lists the input for the piping model or for the dynamic input.

14. Mass Model

lumped masses for the dynamic runs.

a fairly uniform distribution of masses.

Large or irregular variations in the values shown should beinvestigated. Usually these large values can be reduced by

breaking down exceedingly long, straight runs of pipe.


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15. Boundary

Condition

The Active Boundary Condition Report

shows the user how CAESAR II dealt with

the nonlinear restraints in the job. It showswhich directional supports were included,

which gaps were assumed closed, and

just how friction resistance was modeled.


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11.3 Animation of Dynamic Results


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