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Bumpstop control of a vehicle suspension with bilinear damping
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
University of Illinois at Urbana-Champaign, Department of Mechanical Science and Engineering, Illinois, USA.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-1426-1936
2007 (English)Report (Other academic)
Place, publisher, year, edition, pages
2007.
Series
TRITA-AVE, ISSN 1651-7660 ; 2007:74
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7836OAI: oai:DiVA.org:kth-7836DiVA: diva2:12974
Note

Uppdaterad från manuskript till rapport(20101118). QC 20101118

Available from: 2007-12-14 Created: 2007-12-14 Last updated: 2017-03-29Bibliographically approved
In thesis
1. Low-cost control of discontinuous systems including impacts and friction
Open this publication in new window or tab >>Low-cost control of discontinuous systems including impacts and friction
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

For a successful design of an engineering system it is essential to pay careful attention to its dynamic response. This is particularly true, in the case of nonlinear systems, since they can exhibit very complex dynamic behaviour, including multiple co-existing stable solutions and chaotic motions, characterized by large sensitivity to initial conditions. In some systems nonlinear characteristics are desired and designed for, but in other cases they are unwanted and can cause fatigue and failure. A type of dynamical system which is highly nonlinear is discontinuous or non-smooth systems. In this work, systems with impacts are primarily investigated, and this is a typical example of a discontinuous system. To enhance or optimize the performance of dynamical systems, some kind of control can be implemented. This thesis concerns implementation of low-cost control strategies for discontinuous systems. Low-cost control means that a minimum amount of energy is used when performing the control actions, which is a desirable situation regardless of the application. The disadvantage of such a method is that the performance might be limited as compared with a control strategy with no restrictions on energy consumption. In this work, the control objective is to enforce a continuous or discontinuous grazing bifurcation of the system, whichever is desirable. In Paper A, the dynamic response and bifurcation behaviour of an impactoscillator with dry friction is investigated. For a one-degree-of-freedom model of the system, analytical solutions are found in separate regions of state space. These are then used to perform a perturbation analysis around a grazing trajectory. Through the analysis, a condition on the parameters of the system is derived, which assures a continuous grazing bifurcation. It is also shown that the result has bearing on the dynamic response of a two-degree-of-freedom model of the system. A low-cost active control strategy for a class of impact oscillators is proposed in Paper B. The idea of the control method is to introduce small adjustments in the position of the impact surface, at discrete moments in time, to assure a continuous bifurcation. A proof is given for what control parameters assures the stabilization. In Paper C, the proposed low-cost control method is implemented in a quarter-car model of a vehicle suspension, in order to minimize impact velocities with the bumpstop in case of high amplitude excitation. It is shown that the control method is effective for harmonic road excitation.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. viii, 48 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2007:79
Keyword
nonlinear dynamics, discontinuities, nonlinear control, impacts, friction, vehicle suspensions
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4581 (URN)978-91-7178-830-6 (ISBN)
Presentation
2007-12-18, D3, D-huset, Lindstedtsvägen 5, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20101118Available from: 2007-12-14 Created: 2007-12-14 Last updated: 2010-11-18Bibliographically approved

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