{"id":559486,"date":"2024-11-05T18:24:07","date_gmt":"2024-11-05T18:24:07","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-980202011\/"},"modified":"2024-11-05T18:24:07","modified_gmt":"2024-11-05T18:24:07","slug":"esdu-980202011","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-980202011\/","title":{"rendered":"ESDU 98020:2011"},"content":{"rendered":"<p><strong>General<\/strong><\/p>\n<p>The three fundamental wave types that can propagate in plates<br \/>\nare bending, shear and longitudinal waves. A wave type that is<br \/>\nincident on a junction can be transmitted and reflected as all<br \/>\nthree types as illustrated in Sketch 2.1. This wave propagation in<br \/>\nstructures is sometimes referred to as structure-borne sound<br \/>\n(Derivation 3).<\/p>\n<p>This Item permits estimation of the ratio of transmitted to<br \/>\nincident wave power, that is, the transmission efficiencies of an<br \/>\narbitrary junction of between two and six coupled thin isotropic<br \/>\nplates. The plates can either be coupled directly as in Sketch 2.1,<br \/>\nor via a beam element as shown in Sketch 2.2.<\/p>\n<p>There are two main applications of this Item. Firstly, it allows<br \/>\nthe evaluation, of the attenuation expressed as the transmission<br \/>\nloss, R<i><sup>ij<\/sup><sub>pr<\/sub><\/i>, of vibrational power<br \/>\nthrough different plate junctions, and the determination of the<br \/>\npercentage of the incident wave power that is being transmitted as<br \/>\nbending, shear and longitudinal wave power. Secondly, the Data Item<br \/>\nallows the calculation of diffuse field transmission efficiencies<br \/>\nin 1\/3-octave bands, octave bands or at a user defined constant<br \/>\nbandwidth. These can be used to calculate coupling loss factors for<br \/>\nSEA (Statistical Energy Analysis) models.<\/p>\n<p>Transmission efficiencies of coupled plates are functions of the<br \/>\nangle of incidence, \u00df. If the movement of the junction is not<br \/>\nrestricted, as is assumed in this Item, then bending waves and at<br \/>\nleast one of the other wave types (longitudinal or shear in the<br \/>\nplates or torsion or longitudinal in the beam element) will<br \/>\nnormally be present, and then the transmission efficiencies will<br \/>\nalso be functions of frequency.<\/p>\n<p>The transmission efficiencies for coupled plates have also some<br \/>\napplication for coupled curved plates and for coupled beams. Above<br \/>\nthe ring frequency, a curved plate behaves with good accuracy as a<br \/>\nflat plate. Transmission efficiencies for flat plates can therefore<br \/>\nbe used to describe a similar coupling between curved plates for<br \/>\nfrequencies above their ring frequencies. For coupled beams, the<br \/>\ntransmission efficiencies are identical to those of a similar plate<br \/>\nsystem at normal incidence (\u00df=0).<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Estimation of Transmission Efficiencies of Coupled Plates<\/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>2011-02<\/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-559486","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\/559486","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=559486"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559486"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559486"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}