ST_CM_MeanStressCorrection_InitPars

Function block-specific structure with initialization parameters, which are analyzed when the function block is initialized.

TYPE ST_CM_MeanStressCorrection_InitPars EXTENDS ST_CM_Object_InitPars :
STRUCT
    eMeanStressCorrection : E_CM_MeanStressCorrection
                            := E_CM_MeanStressCorrection.eCM_Goodman;  (* Mean stress correction type, e.g. Goodman or Gerber correction. *)
    nBins                 : UDINT := 1;                                (* Number of bins for the stress levels. *)
    fBinWidth             : LREAL := 1.0;                              (* Width of the stress bins. *)
    nBinsMean             : UDINT := 1;                                (* Number of bins for the mean levels. *)
    fBinWidthMean         : LREAL := 1.0;                              (* Width of the mean stress bins. *)
    fUTS                  : LREAL := 700.0;                            (* Ultimate tensile strength of material. *)
    nChannels             : UDINT := 1;                                (* Number of channels. *)
END_STRUCT
END_TYPE

• eMeanStressCorrection defines the correction mode to be used. The correction according to Goodman and Gerber is available as well as the option not to make a correction.
• nBins defines the number of bins for the stress level. The total number of bins is nBins + 2; the value must be at least one. The first bin of each row contains the stress levels that are less than or equal to the defined minimum; analogously, all values greater than the defined maximum fall into the last bin of each row.
• fBinWidth defines the width of the bins for the stress level. The parameter must be chosen according to the dimension of the incoming counting matrix, i.e. in the case of correction of an output from the function block FB_CMA_RainflowCounting, the value (fMaxStress – fMinStress)/nBins must be selected here.
• nBinsMean defines the number of bins for the mean values. The value must be at least one. Two separate bins are added in the first/last column of the Halfcycle Count Matrix, where mean values are kept that are less than or equal to or, respectively, greater than the defined limits.
• fBinWidthMean defines the width of the bins for the mean values of the stress cycles. The parameter must be chosen according to the dimension of the incoming counting matrix, i.e. in the case of correction of an output from the function block FB_CMA_RainflowCounting, the value (fMaxMean – fMinMean)/nBinsMean must be selected here.
• fUTS defines the tensile strength of the monitored material
• nChannels defines the number of independent channels. This must be greater than zero.