Design Optimization of MagneShock Magnetorheological Shock Absorbers and Development of Fuzzy Logic Control Algorithms for Semi-Active Vehicle Suspensions
| dc.contributor.advisor | Gregory Buckner, Committee Chair | en_US |
| dc.contributor.advisor | Eric Klang, Committee Member | en_US |
| dc.contributor.advisor | Jeff Eischen, Committee Member | en_US |
| dc.contributor.author | Craft, Michael Jacob | en_US |
| dc.date.accessioned | 2010-04-02T17:52:35Z | |
| dc.date.available | 2010-04-02T17:52:35Z | |
| dc.date.issued | 2004-04-22 | en_US |
| dc.degree.discipline | Mechanical Engineering | en_US |
| dc.degree.level | thesis | en_US |
| dc.degree.name | MS | en_US |
| dc.description.abstract | Automotive ride quality and handling performance remain challenging design tradeoffs for modern, passive automobile suspension systems. Despite extensive published research outlining the benefits of active vehicle suspensions in addressing this tradeoff, the cost and complexity of these systems prohibit widespread commercial adoption. Semi-active suspensions offer reduced performance benefits over passive suspensions without the cost and complexity associated with fully active systems. This paper outlines the benefits of implementing real-time, fuzzy logic control (FLC) to a vehicle suspension equipped with commercially available magnetorheological (MR) shock absorbers, Carrera MagneShocks™. MagneShocks™ utilize controllable electromagnets to change the MR fluid viscosity and vary the damping characteristics of the shock. The application of FLC to these components, based on the expertise of experienced engineers from the racing industry, was first tested and refined in simulation, then applied experimentally, resulting in the significant improvement of vehicle performance. Results include 25% reductions in sprung-mass absorbed power (U.S. Army 6 Watt Absorbed Power Criterion) as compared with typical original equipment (OE) shock absorbers over urban terrains in both simulation and experimentation. RMS sprung-mass accelerations were also reduced by as much as 9%, but usually with an increase in total suspension travel over the passive systems. Nominal degradations in RMS tire normal forces were documented through computer simulations. When compared to fixed-current MagneShocks™, FLC resulted in 2-9% reductions in RMS sprung-mass accelerations and comparable absorbed powers. Possible means for improving the performance of this semi-active suspension include reducing the suspension spring stiffness and increasing the dynamic damping range of the MagneShock™ | en_US |
| dc.identifier.other | etd-04192003-173144 | en_US |
| dc.identifier.uri | http://www.lib.ncsu.edu/resolver/1840.16/12 | |
| dc.rights | I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. | en_US |
| dc.subject | Automobile Suspension | en_US |
| dc.subject | MR Fluid | en_US |
| dc.subject | Magnetorheological | en_US |
| dc.subject | Fuzzy Logic Control | en_US |
| dc.subject | Semi Active | en_US |
| dc.title | Design Optimization of MagneShock Magnetorheological Shock Absorbers and Development of Fuzzy Logic Control Algorithms for Semi-Active Vehicle Suspensions | en_US |
Files
Original bundle
1 - 1 of 1
