dc.contributor.author	Simon, David E.	en
dc.contributor.committeechair	Ahmadian, Mehdi	en
dc.contributor.committeemember	Kachroo, Pushkin	en
dc.contributor.committeemember	Robertshaw, Harry H.	en
dc.contributor.committeemember	Riffle, Judy S.	en
dc.contributor.committeemember	Shultz, Allan R.	en
dc.contributor.committeemember	Deck, Paul A.	en
dc.contributor.department	Mechanical Engineering	en
dc.date.accessioned	2014-03-14T20:52:32Z	en
dc.date.adate	1998-10-19	en
dc.date.available	2014-03-14T20:52:32Z	en
dc.date.issued	1998-09-07	en
dc.date.rdate	1998-10-19	en
dc.date.sdate	1998-09-07	en
dc.description.abstract	This study evaluates the performance of a semiactive magnetorheological primary suspension on a heavy truck application. A set of magnetorheological dampers is designed, fabricated, and characterized. The set of magnetorheological test dampers are implemented on a Volvo VN heavy truck. An embedded controller determines the level of damping to be supplied by the test dampers. The level of damping in each of the controllable magnetorheological dampers is determined according to a skyhook control scheme. Eleven PCB Piezotronics accelerometers are used to measure the acceleration at various points on the truck. The measurement positions include four measurements on the axles of the truck, and four measurements on the frame of the truck. This data is both recorded for post-test analysis and determining the damping level during testing. Q Additionally, three accelerometers measure the roll, heave, and pitch of the truck cab. The performance of the truck equipped with the semiactive magnetorheological suspension is primarily compared to the performance of the truck with the original (stock) passive system. Results from operation with the adjustable dampers fixed in both their on and off states are also given. The performance comparison between the semiactive and the original passive system is performed for two different driving situations. The first comparison between the two suspension types is for a test case where the truck is driven over a speed bump at approximately 6-7 mph. The second comparison is for the test case where the truck is driven at a constant speed along a stretch of straight and level highway at a constant speed of 55 mph. Acceleration data for both of these test cases is analyzed in the time domain (RMS and peak values of acceleration), and in the frequency domain (average peak intensity in different frequency bands). The findings presented here are confined to the specific magnetorheological dampers that were tested on the truck. Little effort was spent on tuning the high and low states of the adjustable dampers. In addition, the controller used was relatively crude, in the sense that it only implemented the on-off skyhook policy. The findings are meant to highlight some of the potential benefits, as well as shortcomings, of the magnetorheological dampers for heavy truck applications. The data for driving the truck over speed bumps indicate that the magnetorheological dampers used in this study with the skyhook control policy have only a small effect on the vehicle body and wheel dynamics, as compared to the passive stock dampers. The highway data shows that magnetorheological dampers and skyhook control policy are effective at reducing the RMS value of the measured acceleration at most measurement points, as compared to the stock dampers.	en
dc.description.degree	Master of Science	en
dc.identifier.other	etd-91898-203427	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-91898-203427/	en
dc.identifier.uri	http://hdl.handle.net/10919/37032	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	title_page.PDF	en
dc.relation.haspart	abstract.pdf	en
dc.relation.haspart	Acknowledgements.PDF	en
dc.relation.haspart	table_of_contents.PDF	en
dc.relation.haspart	list_of_figures.PDF	en
dc.relation.haspart	ch1.PDF	en
dc.relation.haspart	ch2.PDF	en
dc.relation.haspart	ch3.PDF	en
dc.relation.haspart	ch4.PDF	en
dc.relation.haspart	ch5.PDF	en
dc.relation.haspart	appendix_1.pdf	en
dc.relation.haspart	appendix_2.pdf	en
dc.relation.haspart	appendix_3.pdf	en
dc.relation.haspart	appendix_4.pdf	en
dc.relation.haspart	references.PDF	en
dc.relation.haspart	vita.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	Semiactive MR Variable Damper Suspension	en
dc.title	Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck 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

Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck Applications

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