Study Of New Cycloidal Propeller Based On Stepper Motor

The shipbuilding industry is important to china national economy development. Also the shipbuilding industry is the core of the national security industry and basis of the development of marine equipment industry. With exploitation of the deep-sea oil and rapid development of marine economy, the demand of offshore drilling platforms, semi-submersible vessels, lifeboats, platform supply vessels, cabling ships and other marine engineering equipment is increasing sharply. Ship propulsion is the key equipment in the marine engineering equipment. High-performance marine engineering equipment requires ship propulsion to have good maneuverability, low equipment failure rate, large dynamic drag force, strong anti-wave ability, low maintenance cost and ect. As a excellent performance propeller, the cycloidal propeller is widely used in tugs, minesweeper, floating crane, dynamic positioning. This paper analyzed cycloidal propeller's working principle and established mathematical model on control of cycloidal propeller. Then proposed a new type cycloidal propeller based on stepper motor, designed its control system, and manufactured the prototype of new cycloidal propeller. Developed a set of cycloidal propeller's experimental system. Carried out experimental research of new cycloidal propeller and verfied the theoretical results. The main study works and chapter arrangement of this paper are as as follow:In chapter one:presented the basic concepts of cycloidal propeller and the importance of cycloidal propeller study. Discussed cycloidal propellers'application in navigation devices, aircraft and energy. Then continually, through analyzing the present research situation of cycloidal propeller, problems existed in current cycloidal propeller were obtained. Finally, carried out main research work and general frame of this paper.In chapter two:introduced cycloidal propeller's working principle. Studied the rule of cycloidal propeller blade's oscillating movement, and then established control model on cycloidal propeller. Focused on the research of cycloidal propeller's hydrodynamic performance and obtained computational formula of thrust coefficient, torque coefficient and propulsion efficiency. Furher more, carried out research about the hydrodynamic performance of cycloidal propeller. In chapter three:summarized analysis of the traditional cycloidal propellers' structure. Then put forward structural design of cycloidal propeller based on stepper motor. The computation results showed that the project is effective and feasible. This propeller controlled blade's angle precisely using stepper motor, which solved traditional cycloidal propeller's problems.In chapter four:designed the control system framework of new cycloidal propeller based on stepper motor. Constructed the control system hardware environment applying virtual instrument. Based on the control model of cycloidal propeller, presented a control algorithm used in new cycloidal propeller and developped a control program. In addition, the dynamic reponse time, control error and other related performance indicators of the control system were tested. The test results showed that the control system could meet control requirement of new cycloidal propeller.In chapter five:overall designed a set of cycloidal propeller's experiment system and completed installation and debugging of experiment system. Then, hydrodynamic experimental data were obtained after carrying out the experimental studies of new cycloidal propeller on the experiment system. Further more, the changing regularity of hydrodynamic performances of cycloidal propeller on different status were analyzed based on the experimental data. Verified the theory analysis results of hydrodynamic force.In chapter six:the concolutions are presented and some advanced topics in the proposed methodology that needs further investigation in future are presented and addressed.