| Vibration problem of the rotary machinery has been an important subject of mechanical industry. With the rotor speed continuously improve, the vibration problem which has a direct influence work efficiency and reliability to the rotary machinery is becoming more and more serious. Especially for high speed rotary machinery, vibration is an unavoidable issue.There are many methods to eliminate the vibration caused by the unbalance of the rotor, according to the types of control they can be divided into active balance technology and passive balance technique. Pendulum-type automatic balance device is one of the passive balance devices. The paper studied place the dynamic characteristics of pendulum-type automatic balance device through theoretical and experimental analysis.The main work of this paper was shown as follows:1. The characteristics of the unbalanced rotor were recounted and the self-synchronization phenomenon was explained. The motion equations of the Pendulum-type automatic balance device were deduced by using Lagrange’s equation and the mathematical model of the equipment was built.2. The computer simulation was done based on Matlab, and the mathematical model of the experimental device was analysis numerically by Runge-Kutta algorithm. The relationship between the parameters (speed, the pendulum number, length, quality and installation location, the rolling friction coefficient and viscous damping coefficient) and the dynamic characteristics of pendulum-type automatic balance device was analyzed through simulation.3. The test bench was built and the structure characteristics of it was analyzed.The vibration signal test system and the signal collection procedures and signal processing program was designed in LabVIEW. And experiments were done according to pendulum parameters(number, length, quality and installation location).And the stability stay position of the pendulum were observed to verify "self-synchronization " phenomenon by using a digital camera. |
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