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STUDY ON ELECTRORHEOLOGICAL FLUID DAMPER FOR APPLICATION IN MACHINING CHATTER CONTROL

Chinese Journal of Mechanical Engineering 2003年第1期16卷 13-16页

作者： Yu Junyi Zhang YongliangWang Maohua Zhou XiaoqinFaculty of Mechanical Scienceand Engineering,Jilin University,Changchun 130025, China Faculty of Mechanical Scienceand Engineering Jilin University Changchun 130025

The electrorheological fluid(ERF)is a kind of intelligent material withbright prospects for industry applications, which has viscoelastic characteristic under the appliedelectric field. The dynamic model of a milling system with an ERF damper is established, and thechaffer suppression mechanism of the ER effect is discussed theoretically. Both the theoreticalstudy and the experimental investigation show that the additional damping and additional stiffnessproduced by the ERF increase with the rise in the strength of electric field E, but their influenceon the cuffing stability is different. Only when both additional damping and additional stiffnesscooperate, the milling chatter can be suppressed quickly and effectively. In additional, an ERFdamper used on the arbor of horizontal spindle milling machine is developed, and a series of millingchatter control experiments are performed. The experimental results show that the milling chaffercan be suppressed effectively by using the ER damper.

关键词： Machining chaffer ERF damper additional damping additional stiffness Chaffer control

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Responses of wind-induced internal pressure in a two-compartment building with a dominant opening and background porosity Part 1:Theoretical formulation and experimental verification

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Journal of Central South University 2012年第10期19卷 2940-2948页

作者：余先锋全涌顾明 State Key Laboratory of Disaster Reduction in Civil Engineering(Tongji University)

The equations governing wind-induced internal pressure responses for a two-compartment building with a dominant opening and background porosity were *** unsteady form of the Bernoulli equation,the law of mass conservation,and adiabatic equation were used for the *** precision of the governing equations was verified by a wind tunnel test on a rigid model of a low-rise *** results show that the governing equations can effectively analyze the wind-induced internal pressure *** internal pressure responses in both compartments are suppressed due to the additional damping provided by background *** responses of internal pressure in both compartments,especially in the compartment without an external opening,decrease with increased lumped leakage area.

关键词： dominant opening internal pressure background porosity additional damping wind tuunel test

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