{"id":374881,"date":"2017-03-10T03:00:00","date_gmt":"2017-03-10T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=88603e39b7a06555f16ee31fbcfea224"},"modified":"2017-03-10T03:00:00","modified_gmt":"2017-03-10T00:00:00","slug":"adjustable-pipes-and-adaptive-passive-damping","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=374881","title":{"rendered":"Adjustable pipes and adaptive passive damping"},"content":{"rendered":"<p>Pipe natural frequencies are dependent on the geometry of the pipe where the pipe length is the main<br \/>\ncontributor in regulating the natural frequencies. The boundary conditions are another major<br \/>\ncontributor because the acoustic waves in the pipe will produce standing waves because of the<br \/>\nreflections at the boundary conditions. Making one of the boundary conditions location in the pipe<br \/>\nadjustable will allow for the length of the pipe to be modified and therefore change the natural<br \/>\nfrequencies of the pipe. This adjustable pipe provides a means for introducing undergraduate<br \/>\nstudents to an inexpensive setup to test pipe length in changing the natural frequencies of pipes<br \/>\nand the associated sound pressure level within the pipe. Helmholtz resonators are passive devices<br \/>\nthat can absorb acoustic energy from an acoustic enclosure. These resonators have three major<br \/>\nvariables that are used to determine the resonant frequency of the resonator and therefore the<br \/>\nfrequency at which the resonato&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pipe natural frequencies are dependent on the geometry of the pipe where the pipe length is the main<br \/>\ncontributor in regulating the natural frequencies. The boundary conditions are another major<br \/>\ncontributor because the acoustic waves in the pipe will &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-374881","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/374881","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=374881"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/374881\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=374881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=374881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=374881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}