{"id":559423,"date":"2024-11-05T18:23:55","date_gmt":"2024-11-05T18:23:55","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-970192010\/"},"modified":"2024-11-05T18:23:55","modified_gmt":"2024-11-05T18:23:55","slug":"esdu-970192010","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-970192010\/","title":{"rendered":"ESDU 97019:2010"},"content":{"rendered":"<p><strong>INTRODUCTION<\/strong><\/p>\n<p>This Data Item describes the use of ESDUpac A9719 which provides<br \/>\na computer program for determining the equilibrium temperatures and<br \/>\nheat flow rates in a network of heat conducting and dissipating<br \/>\ncomponents. The thermal network analysis implemented by the program<br \/>\nis quite general but is most immediately applicable to<br \/>\nself-contained bearing assemblies such as dry rubbing bearings,<br \/>\nrolling element bearings, fluid film bearings lubricated by oil or<br \/>\ngrease, and oil-impregnated porous bearings. The program<br \/>\nincorporates representations of a number of standard parts, such as<br \/>\nshaft and bush parts, that can be combined to model the heat<br \/>\ngeneration, conduction and dissipation (by convection and<br \/>\nradiation) in the complete assembly.<\/p>\n<p>The temperatures in a bearing assembly might need to be<br \/>\nestimated so that wear rates and load limits can be determined or<br \/>\noperating film thickness and power loss be estimated. Also, an<br \/>\nestimate of reservoir or sump temperature might allow thermal<br \/>\ndegradation of lubricants and lubricant life to be assessed. The<br \/>\ntemperatures at other points in the assembly might also need to be<br \/>\ndetermined. For example, bearing temperatures are usually measured<br \/>\nat the bearing back rather than at the friction surface and it may<br \/>\nbe required to predict this temperature for comparison with test<br \/>\nresults. Temperatures at external surfaces may also be required for<br \/>\nassessment of any safety hazard.<\/p>\n<p>Another important reason for pursuing such an analysis is to<br \/>\nidentify thermal conditions that could lead to problems or failure<br \/>\nin operation. For example, if the predicted temperature for the<br \/>\ninner race of a rolling bearing were considerably higher than that<br \/>\nof the outer race a loss of diametral clearance, and consequential<br \/>\nrisk of thermal runaway, would be indicated.<\/p>\n<p>The program implements much of the heat transfer and heat<br \/>\ndissipation analysis methods described in a previously issued set<br \/>\nof Data Items numbered 78026, 78027, 78028, 78029 and 79002 (see<br \/>\nDerivations 6 to 10) and provides a replacement for the manual<br \/>\nmethod of determining the equilibrium conditions in a bearing<br \/>\nassembly described in those Data Items. The Items can be referred<br \/>\nto for the theoretical basis of some of the analysis and for<br \/>\ndiscussion of practical considerations.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Equilibrium Temperatures in Self-Contained Bearing Assemblies (Use of Computer Program A9719)<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/esdu\/\"><b>ESDU<\/b><\/a><\/td>\n<td>2010-05<\/td>\n<td>NA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559423","1":"product","2":"type-product","3":"status-publish","5":"product_cat-esdu","7":"first","8":"instock","9":"sold-individually","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/559423","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:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559423"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559423"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}