Force and Moment from Modal Analysis

Hello,

I have extracted the results from modal analysis. The results look like the following picture.

As you seen in the table header, there are FX1, FY1, FZ1, MX1, MY1, MZ1 and FX2, FY2, FZ2, MX2, MY2, MZ2. So, I have two questions.

1. What does the number end of the FX, FY, FZ, MX, MY, MZ mean? 

2. Displacement of each modeshape as shown in modal analysis result based on mass normalization. So, whether the force and moment of the result are the actual loading or not. Do they have unit, such as N, N*m or dimensionless?

Thank in advance

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  • Greetings, 

    The following are defined as: FX1, FY1, FZ1, MX1, MY1, MZ1 and FX2, FY2, FZ2, MX2, MY2, MZ2

    FX1 Force in the X-direction acting at the first point (PT1). MX1 Moment in the X-direction acting at the first point (PT1).
    FY1 Force in the Y-direction acting at the first point (PT1). MY1 Moment in the Y-direction acting at the first point (PT1).
    FZ1 Force in the Z-direction acting at the first point (PT1). MZ1 Moment in the Z-direction acting at the first point (PT1).
    FX2 Force in the X-direction acting at the last point (PT2). MX2 Moment in the X-direction acting at the last point (PT2).
    FY2 Force in the Y-direction acting at the last point (PT2). MY2 Moment in the Y-direction acting at the last point (PT2).
    FZ2 Force in the Z-direction acting at the last point (PT2). MZ2 Moment in the Z-direction acting at the last point (PT2).

    How did you generate this file? 

    Are you running a Time history?

    Are you reviewing the MOD file?

    What version of AutoPIPE are you using?

    Regards,
    Mike Dattilio
    Design Analysis Engineering Group
    Senior Analyst Bentley Systems Inc
    =============================================================================

  • Hello, 

    I have notice something in eigen value export file. The deflection in eigen file does not appear the same as mode shape result (deflection result of mode shape).

    For example, we focus on B39. There are deflection in floating results in AutoPIPE, but there are no results (0 in all directions) in eigen value file.

     

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