Vibration Analysis And Research On Test System Of Dynamic Balance Machine

Rotating machinery is important in the national economy and the people’s livelihood, it is widely used in the industrial production, aerospace, hydroelectric power, transportation and other fields. With the development of production, the requirement of rotating mechanical properties and rotor manufacturing precision is higher, it is urgent to adopt advanced technology in dynamic balance test.Combined the research of domestic and foreign scholars, the theory and technology of rotor balancing principles have been summarized. The thesis has designed the mechanical structure of hard bearing dynamic balance machine, described the balancing method of influence coefficient and in-depth analyzed the two key technologies in the vibration analysis and research on test system of dynamic balance machine on the basis of the theoretical research.Taking into account the dynamic characters of the rotor system which is the key parameter that affect the sensitivity of the balance test, the thesis analyzed the dynamic characters—modal shape, modal frequency, vibration response on the foundation of dynamic model. The thesis completed modal analysis by the establishment of dynamic balance machine, calculated the stiffness of the simplified frame and discuss the relationship between working frequency and natural frequency of system. Then the thesis analyzed the vibration response of unbalance and the structural parameters which affect the dynamic characters. Finally the thesis completed modal test on the platform of balance machine, verified the accuracy of the theoretical analysis and the design of system. The vibration research of dynamic balance machine plays a guiding role in optimizing the structure of machine and improving the accuracy of test.Based on virtual instrument technology, the software is developed in combine with the computer technology and signal processing technology. The software is composed of parameter settings, single test, double test, data analysis and logging out. The method extracting magnitude and phase and the data processing were completed by the software. The perfect test function, the precise numerical computation, the efficient and stationary signal analysis as well as the good human-computer interface design has been achieved through software.Finally, in order to verify the system’s effectiveness, the dynamic balancing test was performed on the platform of balance test. The main works includes extracting magnitude and phase of unbalance signal on the basis of filter correlation technology and completing unbalance correction with influence coefficient. The results of test and application show that the main performance indexes of the balance test developed has high precision and low error rate.