Print Email Facebook Twitter Experimental and numerical study of an autonomous flap Title Experimental and numerical study of an autonomous flap Author Bernhammer, L.O. Navalkar, S.T. Sodja, J. De Breuker, R. Karpel, M. Faculty Aerospace Engineering Department Aerodynamics, Wind Energy & Propulsion Date 2015-12-31 Abstract This paper presents the experimental and numerical study of an autonomous load alleviation concept using trailing edge flaps. The flaps are autonomous units, which for instance can be used for gust load alleviation. The unit is self-powered and self-actuated through trailing edge tabs which are mounted as aerodynamic control devices on free-floating flaps. The flaps are mass underbalanced such that flutter occurs in the operational envelope unless it is suppressed by the control system. Therefore the system is very responsive to both external excitation and control activity of the trailing edge tab. The electrical energy for control activities is then generated by maintaining the flap in controlled limit cycle oscillations. The numerical simulation of such an autonomous flap system demonstrates the ability of controlling the amplitude of limit cycle oscillations, while a net gain in power can be used to charge the battery. These results are compared to experimental results obtained by a wind tunnel study of the said system. Subject autonomous free-floating flapaeroelastic instabilitylimit cycle oscillation To reference this document use: http://resolver.tudelft.nl/uuid:64c569c3-b8c5-4a34-be4a-5c52e7db8501 Publisher IFASD Source Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015, Saint Petersburg, Russia, June 28-July 2, 2015 Part of collection Institutional Repository Document type conference paper Rights (c) The Authors Files PDF 318629.pdf 855.7 KB Close viewer /islandora/object/uuid:64c569c3-b8c5-4a34-be4a-5c52e7db8501/datastream/OBJ/view