There have been a number of untripped rollover accidents involving Sport-Utility Vehicles
\n(SUVs). Accident data shows that these vehicles are unstable when subjected to emergencytype
\nsteering maneuvers, and the physical characteristics of the vehicle are known to have
\ngreat impact on the vehicle\u2019s ability to resist rollover. The automotive industry and automobile
\nhandling\/stability engineers have studied the effect of vehicle design on rollover for decades.
\nPublished papers from the 1960-1970\u2019s discuss basic vehicle geometry as a primary factor on
\nrollover resistance. Track width and center of gravity height are referred to as first order metrics
\nwith respect to a vehicle\u2019s lateral force capacity by almost every auto manufacturer in the world.
\nThis means that a wide and low vehicle has more rollover resistance (and higher lateral force
\ncapacity) than a tall and narrow vehicle. Static Stability Factor (SSF) also known as T\/2H (track
\nwidth divided by two times the center of gravity height) is currently used by the National
\nHighway Traffic Safety Administration (NHTSA) to assign vehicle rollover performance ratings.
\nAt the same time, the well-established automotive aftermarket has been providing custom wheel
\nand tire packages for decades, and for vehicles of all types including SUVs. While some
\nprevious research has evaluated the consequence of the \u201cplus-sizing\u201d concept (wherein the
\noverall diameter is kept as close to original as possible), little work has been done to evaluate
\nthe potential consequence of installing wheels and tires that have notably different dimensions
\nthan stock (both in terms of physical dimensions and other characteristics). For example,
\nmodifications to an already unstable vehicle that result in raising the center of gravity height
\nand\/or narrowing the track width (or both) will result in a more unstable handling package in
\nterms of resistance to rollover.
\nThis paper will present data from instrumented rollover testing of an SUV with very low rollover
\nresistance with the intent of observing the effect of larger and heavier wheels. The purpose of
\nour testing was: (1) to test\/document the rollover threshold of the stock 1992 Ford Explorer XLT
\n4x2 with accepted industry handling maneuvers, and (2) to test\/document the rollover threshold
\nof the 1992 Ford Explorer XLT 4x2 modified with aftermarket 22-inch wheels with 18mm offset
\nand 265\/35R22 102V tires with the same accepted industry handling maneuvers. A comparison
\nof the two test setups will be used to establish a relationship between the change in the
\nwheel\/tire condition and the dynamic roll resistance of the vehicle as a whole.<\/p>\n
<\/div>","protected":false},"excerpt":{"rendered":"
Micky Gilbert, Brad Stolz<\/p>\n","protected":false},"author":163,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[128,346],"tags":[],"class_list":["post-18748","post","type-post","status-publish","format-standard","hentry","category-2014-cmrsc-ccmsr-xxiv-vancouver","category-research-and-evaluation"],"acf":[],"_links":{"self":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/users\/163"}],"replies":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/comments?post=18748"}],"version-history":[{"count":2,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18748\/revisions"}],"predecessor-version":[{"id":19781,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18748\/revisions\/19781"}],"wp:attachment":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/media?parent=18748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/categories?post=18748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/tags?post=18748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}