Dynamics of a String Pendulum

Abstract

A flexible string such as a cable or a wire is used everywhere. There are various uses such as a cable for sending electricity, a wire for tension and a mowing machine turning a nylon string. In the past study, the authors investigated the behavior in casting of a fly-fishing line by experiment and analysis. In the case of fly-fishing, casting is the element which anglers must master in order to cast a fly. Anglers have to cast a light weight fly by using the weight of a line. In the past study, an analysis model of a fly line and a rod, arms was made with rigid body and link. Numerical simulation was carried out and a better casting method was examined. In this study, a method to cut off an object by a turning string is examined based on the conventional study results. In the past study about a cable and a line, appropriateness of the modeling has not been numerically verified by comparing an analysis result with an experiment result. However, appropriateness of the modeling has to be verified numerically by an error of analysis and experiment. Therefore, this study pays attention to the basic movement of the line pendulum as the first grade to a cutting method with a string and makes an analysis model, and clarifies the behavior of line pendulum by experiment and numerical analysis.