Wind Monitoring And Point Of View The Development, Self-correcting The Design Of The New Flagpole

Since the Hong Kong Handover Ceremony in 1997, indoor flag raising ceremony has been conducted by fixing a wind generating device on the top of the flag post. Such highly publicized events as the successful hosting of Beijing Olympic Games in 2008 and the opening of the Shanghai World Exposition in 2010 have made outdoor flag raising ceremony a much frequent occurrence, but the wind generating device on the top of the flag post alone has proved unable to manage the time-variant and nonlinear characteristics of wind velocity and direction outdoors. Even in the flag raising ceremonies at Tian'anmen Square, flag being tangled with the flag post is not uncommon. Although trivial at first sight, such things will undoubtedly have a negative effect on the public image of our nation. So the redesign and adjustment of the flag post structure are necessary to solve the above problem. A detailed design and research covering control, machinery, communication, and sensors has been conducted in the thesis writing process. Considering the time-variant and nonlinear characteristics of wind velocity and direction, a new kind of flag post control system which features wind velocity and direction detection and angle self-correction is developed.The thesis first elaborates the construction of the control system, the design of the servo system and the mechanical system, laying special emphasis on the selection of the servo motor, and the calculation and matching of the reduction ratio of the reducer. The thesis proceeds to discuss about the use and selection of sensors. The selection of the sensors has been the decisive factor of the successful design. The selection of sensors becomes clear only after the system design has undergone the transformation from active wind detection to passive wind detection. Then, the thesis designs the system software, programs the PLC, fixes the PID parameters, and develops the monitor interface of the up-machine.The final stage is the construction and test of the prototype. Outdoor test of the prototype proves successful, and the system realizes the purpose of the design of passively detecting and following the change of the wind direction. Due to the limited space available in the prototype, electric heater and lightning rod are not included. The system can realize self-unmooring and blowing wind when the wind speed subdues. The system features low cost, high efficiency, high reliability, and wide applicability. The system will be perfected in the practical application in the future.