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Abstract: The rolling mill is the complex mechano-electronic system
controlled by computer. Improper design and some other factors may
result in continuous self-excited vibration. The running faults of
rolling mill influence badly product quality. Even production is
interrupted. A method of self-excited vibration analysis based on
multi-parameter integrative testing and system identification is
provided. The essential factors of the self-excited vibration phenomenon
are analyzed by means of experiment and theory methods. The method of
eliminating self-excited vibration is discussed too. In different
operation conditions there are pure time lag in mathematic model of mill
hydraulic AGC. When time lag exceeds a limit, self-excited vibration can
occurs. The time lag may cause due to improper design of the mounted
structures for roller gap displace transducer. Through dynamics
modification, the time lag of displace feedback signal is reduced to
minimum in the engineering case. And self-excited vibration is
eliminated.
Key
works: Self-excited vibration System identification Time lag Model
structure Structure dynamics
CLC No: TH113.1
国家自然科学基金资助项目(50335030，50405043). Received
20050105, received in revised form 20050404
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