1. VIVANA MPF print flags

1.1. Data group identifier, one input line

VIVAna RMPF PRINT

1.2. Print flags, one input line

IPRCRV NSNAPP DTSNAP

  • IPRCRV: integer, default: 0: Print flag for printing curvature to the _vivana.mpf file.

    • IPRCRV = 0: No print

    • IPRCRV = 1: Print

  • NSNAPP: integer, default: -1: Number of snapshpts to be printed on the _vivana.mpf file.

    • NSNAPP = 0: No print of snapshots

    • NSNAPP < 0: Default values will be used, see below.

  • DTSNAP: real, default: 0: Time step for print of snapshots

    • DTSTEP ≤ 0: Default values will be used, see below.

    • DTSNAP > 0: Snapshots will be printed at DTSNAP intervals.

The default printing of snapshots depends on how response frequencies are combined, see input prameter IOPTSH in VIV response analysis. For concurrently acting frequencies, IOPTSH = 0, the default is 20 snapshots and the default time step for the snapshots is 1/20 th of the period of the highest ranking response frequency with significant response.

For consecutively acting frequencies, IOPTSH = 1, the default number of snapshots is \(\mathrm {MAX(20,8*NFREQ\_SIGNRES)}\), where NFREQ_SIGNRES is the number of response frequencies with significant response. Snapshots are allocated to the different response frequencies depending on their predicted relative durations, but with at least one snapshot per response frequency. The default time step will distribute the snapshots in each response period.

2. Random number generator

In version 4.18 and later, the algorithm for generating pseudo-random numbers may be selected by the user. Both methods are expected to be acceptable for the moderate amount of random numbers needed in VIVAAN. The default, legacy method should be used if backwards compatibility with previous versions is required.

that the default value may change in a future release.

The choice of random number generator will apply to:

  • generation of stress time series for fatigue calculations using the Rain-flow method.

  • output of curvature time series consistent with the stress time series generated for the Rain-flow method.

2.1. Data group identifier, one input line

RANDom NUMBer GENErator

2.2. Random number generator input, one line

CHRAN

  • CHRAN: character (7), default: TWISTER: Choice of random number generator

    • = 'LEGACY': Legacy random number generator used. Results will be consistent with previous VIVANA versions.

    • = 'TWISTER': Mersenne Twister' random number generator used. Results will NOT be consistent with previous VIVANA versions.

3. Termination of input data

3.1. One input line

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