On the Control Aspects of Semiactive Suspensions for Automobile Applications
dc.contributor.author | Blanchard, Emmanuel | en |
dc.contributor.committeechair | Ahmadian, Mehdi | en |
dc.contributor.committeemember | Leo, Donald J. | en |
dc.contributor.committeemember | Robertshaw, Harry H. | en |
dc.contributor.department | Mechanical Engineering | en |
dc.date.accessioned | 2014-03-14T20:41:01Z | en |
dc.date.adate | 2003-07-15 | en |
dc.date.available | 2014-03-14T20:41:01Z | en |
dc.date.issued | 2003-06-19 | en |
dc.date.rdate | 2004-07-15 | en |
dc.date.sdate | 2003-07-03 | en |
dc.description.abstract | This analytical study evaluates the response characteristics of a two-degree-of freedom quarter-car model, using passive and semi-active dampers, along with a seven-degree-of-freedom full vehicle model. The behaviors of the semi-actively suspended vehicles have been evaluated using skyhook, groundhook, and hybrid control policies, and compared to the behaviors of the passively-suspended vehicles. The relationship between vibration isolation, suspension deflection, and road-holding is studied for the quarter-car model. Three main performance indices are used as a measure of vibration isolation (which can be seen as a comfort index), suspension travel requirements, and road-holding quality. After performing numerical simulations on a seven-degree-of-freedom full vehicle model in order to confirm the general trends found for the quarter-car model, these three indices are minimized using optimization techniques. The results of this study indicate that the hybrid control policy yields better comfort than a passive suspension, without reducing the road-holding quality or increasing the suspension displacement for typical passenger cars. The results also indicate that for typical passenger cars, the hybrid control policy results in a better compromise between comfort, road-holding and suspension travel requirements than the skyhook and groundhook control policies. Finally, the numerical simulations performed on a seven-degree-of-freedom full vehicle model indicate that the motion of the quarter-car model is not only a good approximation of the heave motion of a full-vehicle model, but also of the pitch and roll motions since both are very similar to the heave motion. | en |
dc.description.degree | Master of Science | en |
dc.identifier.other | etd-07032003-150548 | en |
dc.identifier.sourceurl | http://scholar.lib.vt.edu/theses/available/etd-07032003-150548/ | en |
dc.identifier.uri | http://hdl.handle.net/10919/33876 | en |
dc.publisher | Virginia Tech | en |
dc.relation.haspart | Thesis-Emmanuel-Blanchard.pdf | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject | Vehicle Dynamics | en |
dc.subject | H2 | en |
dc.subject | Skyhook | en |
dc.subject | Hybrid | en |
dc.subject | Groundhook | en |
dc.subject | Suspensions | en |
dc.subject | Semiactive | en |
dc.title | On the Control Aspects of Semiactive Suspensions for Automobile Applications | en |
dc.type | Thesis | en |
thesis.degree.discipline | Mechanical Engineering | en |
thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
thesis.degree.level | masters | en |
thesis.degree.name | Master of Science | en |
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