Abstract
This work concerns the usage of the internal stiffness and damping nonlinearity for vibration suppression in a van der Pol–type mechanical self-excitation system. Changing the vertical or horizontal damping could limit the growth of the flow-induced instability. Applying harmonic balance method, the energy transfer for the self-excitation vibration is investigated through the limit circle. The steady amplitude of the limit circle is a key parameter that could be used to evaluate the effectiveness of the self-excitation oscillation suppressing. Increasing horizontal damping could reduce the rate of roll on for the steady amplitude curve of the limit circle, but the critical flow velocity for the limit circle occurring is minimally affected. Increasing vertical damping could increase the critical flow velocity, but the rate of the roll on is virtually unaffected when the parameters are properly chosen.
Highlights
Self-excitation of a structure is a common nonlinear mechanism, which can be caused by steady wind flow[1] and dry friction[2] or artificially achieved by nonlinear feedback control.[3,4] The action of the self-excitation oscillation is two-fold: one is to operate utilizing selfexcitation mechanism for the highest energy efficiency
Self-excitation vibration suppression is achieved by internal stiffness and damping nonlinearities that are provided by appending horizontal springs and horizontal dampers, respectively
This article was concerned about the generation and suppression of flow-induced self-excitation vibrations in a type of spring-damper vertical mechanical system
Summary
Self-excitation of a structure is a common nonlinear mechanism, which can be caused by steady wind flow[1] and dry friction[2] or artificially achieved by nonlinear feedback control.[3,4] The action of the self-excitation oscillation is two-fold: one is to operate utilizing selfexcitation mechanism for the highest energy efficiency. Keywords Nonlinear vibration, vibration suppression, self-excitation oscillation, stiffness and damping nonlinearities, limit circle The main objective of this contribution is that changing internal stiffness and damping nonlinearity suppresses the self-excitation vibration. Malas and Chatterjee[3] proposed a nonlinear velocity feedback control method for generating artificial self-excitation vibration in a 2-degrees-of-freedom mechanical system.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
