TORPEDO TRAJECTORY SIMULATION IN HORIZONTAL PLANE WITH CURRENT FORCE

• Main Author: NUGRAHA (NIM: 25515002), WIDIA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31582
• Institution: Institut Teknologi Bandung

<p align="justify">The ability of a torpedo to pursue a target successfully is determined by its control system's ability to correct error in heading quickly without over-oscillation. During initial design, optimal method in terms of cost, time and accuracy is needed to determine the most suitable control system. Simulation in this tesis represents the effect of an applied control system to the torpedo trajectory that occurred. <br /> <br /> In the simulation, torpedo is expected to traverse a straight line with certain orientation in horizontal plane. Design of control algorithm is intended to restore the yaw deviation to the initial or determined orientation. Calculation steps that have been conducted are as follows: <br /> <br /> - Determination of initial condition <br /> <br /> - Determination of time step with small interval <br /> <br /> - Calculation of torpedo's trajectory (position based on velocity and yaw deviation). <br /> <br /> - Change of tail's attack angle in response of the yaw deviation. <br /> <br /> - Change of acceleration and velocity caused by change of tail's attack angle. <br /> <br /> - Return to calculation of torpedo's trajectory. <br /> <br /> From the simulation results, it is concluded that the simulation of yaw deviation correction shows enough effectivity with the use of proportional control to restore torpedo orientation in short time and with insignificant deviation. <br /> <br /> On the other hand, the simulation with current force condition resulting divergent yaw deviation shows that the proportional control alone is unable to maintain or restore the torpedo trajectory to the straight line. The additional derivative control algorithm with input variable of attack angle or transversal velocity (v), resolve the problem with quick response to the current vector providing immediate restoration before the deviation gets too far.<p align="justify">