Research On A Novel High Accuracy Dynamic Balancing System

In the general vibration system for dynamic balancing measurement, the force coupling effect has bad influence on the minimum achievable residual unbalance and the effect of plane separation when sensitivity difference of piezoelectric transducers is caused by environmental fluctuation. A Novel high accuracy dynamic balancing system is researched because of the above reasons. The vibration structure is designed from the concept of instantaneous motion center in the theoretic mechanics. The flexure hinges are used because they can transmit the force without friction which guarantees the accuracy of the dynamic balancing system. The structure characteristic of the vibration system is analyzed in depth. The relation between the real system and the equivalent one is expounded. The kinematics differential equation of the vibration system is established and the plane separation equations for unbalance masses are derived.Two non-parallel four-bar mechanisms are assembled in series to form this vibration system. The vibration system keeps vibration center at the locations of the virtual bearings to improve the effect of plane separation. The piezoelectric transducers are mounted at the common traverse section of two four-bar mechanisms to eliminate the force coupling effect and the influence of the environmental fluctuation. Moreover, the signal conditioning circuits for piezoelectric transducers and opto-electronics transducers are designed. The control circuits for motor driver are also introduced. The sampling and processing methods for dynamic balancing signal are researched. Finally, with the help of integral-period sampling, the single-point FFT algorithm is used to extract the amplitude and phase of the unbalancing signals from the strong noise background. The unbalance masses and position are obtained through the presented plane separation algorithm. Extensive experiment results valid the superiority of the novel dynamic balancing measuring system.