Flexcom > Data Inputs > $SHEAR7

Purpose

To specify fatigue calculation options for SHEAR7 in Block 5.

Theory

Refer to SHEAR7 Data Specification for further information on this feature. For more information, refer to the Shear7 User Guide which is available for download from the Shear7 Support web page.

Keyword Format

A single line with four optional entries:

[ZERO-CROSSING=Zero-Crossing Method Flag] [, FIRST_MODE=First Mode In-line Fatigue Flag] [, BETA=Beta Control Number] [, DIAMETER=Riser Fatigue Diameter]

The Zero-Crossing and First Mode flags can be either YES or NO to indicate whether the specific calculation type is requested or not. The default value for both of flags is NO. These flags are required for SHEAR7 Version 4.7 and above. The Beta Control Number must be an integer from 0 to 10. The default value for this parameter is 4. This flag is required for SHEAR7 Version 4.8 and above. The Riser Fatigue Diameter is a flag used to identify which diameter is considered for riser fatigue. The default value for this parameter is OUTER. This flag is required for SHEAR7 Version 4.8 and above.

Table Input

Input:	Description
Zero-Crossing:	Flag for calculating fatigue with zero-crossing method (YES or NO). The default value is NO. SHEAR7 defines this line as “flag for calculating fatigue with zero crossing method”. YES will correspond to a value of 1. NO will correspond to a value of 0. See the SHEAR7 User Manual for further details. Note (a).
First Mode:	Flag for calculating first mode in-line fatigue damage (YES or NO). The default value is NO. SHEAR7 defines this line as “flag for calculating first mode in-line fatigue damage”. YES will correspond to a value of 1. NO will correspond to a value of 0. See the SHEAR7 User Manual for further details. Note (a).
Beta Control Number:	This value is used by SHEAR7 as an upper limit for the number of iterations used to calculate beta. A default of 4 beta iteration will be used for SHEAR7 V4.8. If a value of 0 is used, no beta iterations will be performed which is consistent with previous versions (SHEAR7 v4.7 and older). See the SHEAR7 User Manual for further details.
Riser Fatigue Diameter:	Flag for specifying which diameter (INNER or OUTER) should be used by SHEAR7 for fatigue calculations. The default value is OUTER. SHEAR7 defines this line as “flag for selecting the riser diameter for fatigue”. OUTER will correspond to a value of 0. INNER will correspond to a value of 1. See the SHEAR7 User Manual for further details.

Notes