Design And Research On The Prop-blade Barycenter Measurement System

The barycenter of the founded blade is bias from the theoretic design which is requested to install in the prop correctly and accurately .This kind of departure results in the differences of the gravity moment and influences the sail's operation, especially the marine ships. As the surface of the blade is complex and composed of splines, it is difficult to underprop and measure in the conventional method. To the above question, this discourse is given a cg measurement system which is automatic, accurate and more safety.The principle of this system is based on the balance of torque and moment, and the spacial geometrics. The cg measurement system for the prop blade solves the above stated problems radically. This paper adopts sliding guideway and sliding screw bolt to support and engage in the measurement and control, which ensure the structure safety and steady. Utilizing the spherical supportor to contain the loading-scale transducer makes the system supportors fit the blade surface, the spline surface perfectly and easily left the blade balanced. In orde to improve the measurement precision and the opetation automatic extent, this paper selects and designs automation control system and data acquisition system. The Visual C++ programme is used to data exchange and for GUI.All the datas are transformed from the sensors to the acquisition cards.All the analog values are changed into digital ones to the computer in order to show the aimed figures on the screen or saved in the variables and files.This system is the composition of data acquisition, hardware and software, automatic control and other compound technologies. This discourse has improved the Dalian marine prop company's conventional measuring method, and also provides the use for reference to other objects in measuring cg system. The system provides a proficient and efficient procedure in the prop-blade manufacturing. The GUI and the calculation procession are actualized through Visual C++ and this system is available for the specification from 20kg to 600kg.