Method and apparatus for real-time structure parameter modification
Patent 5526609 Issued on June 18, 1996. Estimated Expiration Date: November 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A method and apparatus for structural deflection control, as well as associated sequential controls that are based on new control laws. The apparatus of this invention is of relatively low cost and performs better than prior art devices. The essence of the invention is to adjust the dynamic parameters (mass, damping, stiffness coefficients of the structure and/or input forcing coefficients) adaptive to input dynamic loads, by using the new devices and the suggested control laws. In so doing, the structure performs an adaptive function to effectively counter the effects induced by multi-directional external excitations. The required control power can be nil, or many times lower than prior art active control devices, and the effectiveness can be equivalent or even better than the current state-of-the-art active controls. The devices used by the apparatus of this invention can readily be manufactured for immediate application in structures, buildings and contents, and other constructed facilities.
M. Hubbard & D. Margolis (1976) "The Semi-Active Spring: Is it Viable Suspension Concept?" Proceedings of the Fourth Intersociety Conference on Transpostation
D. Margolis & D. Baker (1992) "The variable Fulcrum Isolator: A Low Power, Non-Linear, Vibration Control Component" Transactions of the ASME, vol. 114, pp. 148-154
E. Krasnicki (1980) "Comparison of Analytical and Experimental Results For a Semi-Active Vibration Isolator" The Shock and Viration Bulletin
D. Ivers & L. Miller (1992) "Semi-Active Suspension Technology: An Evolutionary View" ASME DE-vol. 40, Advanced Automotive Technologie