Active control method for output feedback dynamic surface based on flutter of micro-milling processing system

Abstract

The invention discloses an active control method for an output feedback dynamic surface based on flutter of a micro-milling processing system. The active control method comprises the following steps: acquiring a dynamic model of tool vibration of the micro-milling processing system; on the basis of the dynamic model, loading a double-shaft giant magnetostrictive driver, and actively inhibiting the vibration of the cutter; constructing an ASI estimation inverse model to eliminate the hysteresis characteristic of the biaxial giant magnetostrictive actuator; and an output feedback self-adaptive controller for actively inhibiting flutter is obtained based on the design of a high-gain observer and a dynamic surface controller, so that active control on flutter of the micro-milling processing system is realized. According to the invention, the giant magnetostrictive actuator is adopted to actively control the regenerative flutter of the micro-milling system, so that the precision of micro-milling is improved, and the influence of the micro-milling on the micro-milling system is reduced; and the hysteresis characteristic of the giant magnetostrictive actuator is eliminated by constructing an ASI estimation inverse model, so that the control precision of the giant magnetostrictive actuator is greatly improved.

Description

technical field [0001] The invention belongs to the field of precision machining chatter control, in particular to an output feedback dynamic surface active control method based on the chatter of a micro-milling machining system. Background technique [0002] Micro milling is developed on the basis of macro milling. Compared to macro milling, micro milling has the ability to machine tiny parts and complex 3D geometries. Microdevices have the characteristics of good portability, low power consumption, small size and low cost, and have a wide range of needs in the fields of manufacturing, aerospace industry, electronic manufacturing, and optical instruments. Therefore, the research of micro-milling processing technology is of great significance to the manufacture of micro-parts. The main disadvantages of micro-milling are low material removal rates, short tool life and high tool holder costs. Regenerative chatter is one of the main causes of reduced surface quality and tool...

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Problems solved by technology

The second method is to use robust adaptive methods, such as backstepping control, sliding mode control and dynamic surface control methods to compensate the hysteresis without establishing an inverse model, but the disadvantage of this method is that the output feedback In this case, the method fails because the unbounded nature of the nonlinear part of the hysteresis may lead to no upper bound on the observer error

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