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Sensitivity analysis, bending properties of fly line

 

Purpose

The purpose of the sensitivity analysis is to determine how the numerical solution is affected by changes in the bending stiffness, EI, for the fly line.

 

Method

EI is the product of the Young’s modulus, E, and the second moment of inertia, I. No direct measurements have been made to determine EI for the fly line. The sensitivity of the solution to changes in EI is analyzed:

·     The 50ft oh cast reference is used as reference, the solution for this cast is denoted EI flyline 100% (E as for all calculated casts except the two below).

·     A solution, denoted EI flyline 200%, is calculated with a 100% increased Young’s modulus as the only change in relation to the reference cast.

·     A solution, denoted EI flyline 50%, is calculated with a 50% decreased Young’s modulus as the only change in relation to the reference cast.

 

The three solutions are compared in the animation below (click on image to start animation).

En bild som visar text, linje, Graf, diagram

Automatiskt genererad beskrivning

 

Conclusions

·     Changing the bending stiffness +100% and -50%, in relation to the reference, gives a limited impact on the computed casts.

·     It may be concluded that the sensitivity of the solution to changes in the bending stiffness is comparatively small.

·     Note: The monofilament leader is made of materials e.g., nylon/polyamide, with known Young’s modulus and need not be analyzed.