Data acquisition and analysis for fish-like swimming platform

• Main Author: Tan, Rayner Sheng Rong.
• Other Authors: Low Kin Huat
• Format: Final Year Project
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Mechanical engineering::Mechatronics; DRNTU::Engineering::Mechanical engineering::Robots
• Online Access: http://hdl.handle.net/10356/40663
• Institution: Nanyang Technological University

Two types of biomimetic robotic fishes are studied for two different tests. A two Degree of Freedom (DOF) body and/or caudal fin (BCF) robotic fish and a multi- DOF slender robotic fish is used for the study of the adaptation of robotic fish to unsteady flow and to test for robotic fish swimming efficiency respectively. The BCF robotic fish uses a closed-loop motion control system with velocity and position feedback, to control the amplitude and frequency of its tail. With different velocity settings, the BCF fish are proved to hold its desired position. The multi-DOF robotic fish uses Lighthill’s small-amplitude elongated body theory for improving its swimming efficiency. The testing parameters for swimming efficiency are its swimming velocity and power consumption. Power consumption are measured in real-time through using the strain data, acquired at cranks of the robotic fish. In the experiments, BCF robotic fish succeed in swimming against transient flow and the multi-DOF robotic fish recorded had the best efficiency of swimming and fastest swimming velocity when swimming with the fins movement of 1.0 Hz and 2.0 Hz frequency and amplitude of 0° and 20° to the first fin and 30° and 40° to the last fin respectively. Future work like online motion planning and future experiment on the robotic fishes are still in discussion. National Instrument (NI) and LabVIEW are widely used in motion control and data acquisition in recent years. LabVIEW is used on BCF robotic fish and multi-DOF slender robotic fish for real-time control and data acquisition. Its functionality and purpose are further explained. Problems and solutions are revealed and the choice of using the NI instruments and cards are also been justified.