This Data Item summarises the empirical model defined in ESDU
\n10015, Model for performance of a single aircraft tyre rolling or
\nbraking on dry and precipitate contaminated runways, which
\ndescribes the decelerating forces acting on an aircraft type tyre
\nwhen rolling or braking on hard surfaces typical of runways and
\ntaxiways. The model is valid for runways contaminated with water,
\nslush, snow and ice but can also be applied to runways that are
\nfree from any contaminant. In order to calculate decelerating
\nforces, in addition to an approximation to the operating slip ratio
\nfor the braking system, it is necessary to know values of nine
\nvariables, all of which are used in customary calculations of
\naircraft performance. These are<\/p>\n
\u2022 depth of macro-texture of runway surface<\/p>\n
\u2022 depth of contaminant (where applicable)<\/p>\n
\u2022 density of contaminant (where applicable)<\/p>\n
\u2022 ground speed<\/p>\n
\u2022 tyre inflation pressure<\/p>\n
\u2022 normal (to runway) load on tyre<\/p>\n
\u2022 nominal tyre width<\/p>\n
\u2022 nominal tyre diameter<\/p>\n
\u2022 runway surface temperature.<\/p>\n
The model is founded on experiments with aircraft type tyres
\nanalysed in the context of observations based in rubber technology.
\nIt has been substantiated over a range of experimental data so that
\naircraft and ground-test machine performance can be predicted for a
\nwide range of operational envelopes. Where values are known for all
\nthe variables listed above, the model provides estimates of the
\ndecelerating forces due to rolling or braking. However, in cases
\nwhere, say, runway conditions are unknown, the model can be used to
\ndeduce those conditions from ground-test machine measurements.
\nSubsequently, those conditions can be re-applied to the model to
\npredict aircraft performance. In the particular case of winter
\nprecipitation, the model includes the statistical variation of the
\nmechanical properties of snows and the frictional characteristics
\nfor runways that are completely covered with ice or snow.<\/p>\n
Application of the method to multiple-wheel undercarriages is
\nalso considered.<\/p>\n","protected":false},"excerpt":{"rendered":"
Summary of the Model for Performance of an Aircraft Tire Rolling or Braking on Dry or Precipitate Contaminated Runways<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2015-07<\/td>\n 24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":557348,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-557339","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/557339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/557348"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=557339"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=557339"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=557339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}