{"id":281787,"date":"2024-10-19T19:02:34","date_gmt":"2024-10-19T19:02:34","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bsi-pd-cen-tr-168912016\/"},"modified":"2024-10-25T15:42:50","modified_gmt":"2024-10-25T15:42:50","slug":"bsi-pd-cen-tr-168912016","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bsi-pd-cen-tr-168912016\/","title":{"rendered":"BSI PD CEN\/TR 16891:2016"},"content":{"rendered":"<p>This method is used to determine combined wheel-rail roughness and track decay rates from rail vibration during the pass-by of a train. By combining sound pressure measurement from the same pass-by, a vibro-acoustic transfer function for rolling noise is determined.<\/p>\n<p>The track decay rate is a vibration quantity that characterizes the attenuation of rail vibration along the track for a given wheel\/rail contact excitation, and thereby affects the amount of sound radiation from the track.<\/p>\n<p>Combined roughness is a quantity that determines the level of excitation of wheel-rail rolling noise. It can be determined from vertical rail vibration during a train pass-by and the vertical track decay rate. The transfer function can be used to characterize the vibro-acoustic behaviour of the vehicle-track system for a given roughness excitation and in relation to rolling noise. Combined roughness, track decay rates and transfer functions are determined as one-third octave spectra.<\/p>\n<p>The method can be used for the following purposes:<\/p>\n<ul>\n<li>\n<p>to measure track decay rates under operational conditions;<\/p>\n<\/li>\n<li>\n<p>to characterize the effectiveness of noise control measures in terms of combined roughness, transfer function and track decay rate;<\/p>\n<\/li>\n<li>\n<p>to compare the combined roughness before and after noise control measures are implemented (thereby quantifying the effect of any change in wheel or rail roughness);<\/p>\n<\/li>\n<li>\n<p>to monitor wheel roughness during a pass-by, either of whole trains or parts of trains; \u2014 to separate rolling noise from other sources;<\/p>\n<\/li>\n<li>\n<p>to assess a threshold for the rail roughness by measuring multiple pass-bys.<\/p>\n<\/li>\n<\/ul>\n<p>The method is not for approval of sections of reference track in terms of acoustic rail roughness and track decay rates, which are covered by <span class=\"std\"> <span class=\"std-ref\">EN&nbsp;15610<\/span> <\/span> and <span class=\"std\"> <span class=\"std-ref\">EN&nbsp;15461<\/span> <\/span>, respectively.<\/p>\n<p>The method is applicable to trains on conventional tracks, i.e. normal ballasted tracks with wooden or concrete sleepers and on ballastless track systems.<\/p>\n<p>The method has not yet been validated for:<\/p>\n<ul>\n<li>\n<p>non-standard wheel types such as small wheels up to 600&nbsp;mm diameter, resilient tram wheels;<\/p>\n<\/li>\n<li>\n<p>non-standard track types such as embedded rail or grooved rail;<\/p>\n<\/li>\n<\/ul>\n<p>The method is not applicable to track with rail joints.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Railway applications. Acoustics. Measurement method for combined roughness, track decay rates and transfer functions<\/b><\/p>\n<table class=\"shortdes-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\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2016<\/td>\n<td>60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":281791,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-281787","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","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\/281787","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\/281791"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=281787"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=281787"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=281787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}