{"id":1435,"date":"2023-04-13T07:45:27","date_gmt":"2023-04-13T05:45:27","guid":{"rendered":"https:\/\/motycs.it\/?page_id=1435"},"modified":"2023-05-09T09:27:54","modified_gmt":"2023-05-09T07:27:54","slug":"potenza-dissipata-banchi-prova","status":"publish","type":"page","link":"https:\/\/motycs.it\/en\/power-losses-on-chassis-dynamometers\/","title":{"rendered":"Dyno test power losses"},"content":{"rendered":"<div data-vc-full-width=\"true\" data-vc-full-width-init=\"false\" class=\"vc_row wpb_row vc_row-fluid vc_custom_1473769871896 vc_row-has-fill\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"sc_section margin_top_large margin_bottom_huge\" data-animation=\"animated fadeInUp normal\" style=\"max-width: 1030px; margin: auto;\"><div class=\"sc_section_inner\"><h6 class=\"sc_section_subtitle sc_item_subtitle\">Theory<\/h6><h3 class=\"sc_section_title sc_item_title sc_item_title_without_descr\">Calculation of power dissipation<\/h3><div class=\"sc_section_content_wrap\">\n\t<div class=\"wpb_text_column wpb_content_element  vc_custom_1683617271238\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<header><\/header>\n<h6><strong>POWER AT THE CRANKSHAFT<\/strong><\/h6>\n<p>On a roller test bench, the <strong>shaft power is the only reference value<\/strong><strong>, also because it is NOT influenced by variables in play including<\/strong>:<\/p>\n<ul>\n<li>Type of tyres (winter, summer..)<\/li>\n<li>Tyre pressure<\/li>\n<li>Inefficient transmission components due to wear or minor damage<\/li>\n<\/ul>\n<p>It is also the<strong>only reference value that can also be measured on the engine test bench<\/strong>, an instrument on which the natural course of development of any type of engine begins.<\/p>\n<h6><strong>POWER TESTS ON CHASSIS DYNAMOMETERS<\/strong><\/h6>\n<p>When it comes to <strong>dyno tests on roller test benches<\/strong>, <strong>the dyno test is therefore carried out according to certain principles<\/strong>, in order to <strong>correctly trace the power back to the crankshaft. <\/strong><\/p>\n<p>The test must be taken in <strong>two distinct phases<\/strong>:<\/p>\n<ul>\n<li><strong>Step 1 - Calculation of POWER ON THE WHEEL<\/strong><\/li>\n<\/ul>\n<p>In the first phase of the test, <strong>the test bench measures power at the wheel<\/strong>, by the radial acceleration of the roller (its inertial component) and the force applied by the eddy current brake to the load cell.<\/p>\n<p><strong>This period usually coincides with the period of vehicle acceleration on the test stand<\/strong>, which normally lasts between 12 and 15 seconds. This time must correspond as closely as possible to the same time it would take (for the same acceleration) on the road.<\/p>\n<ul>\n<li class=\"entry-header\"><strong>Second step - Calculation of POWER LOSSES <\/strong><\/li>\n<\/ul>\n<p>In the second phase, which begins at the end of the load test on the dyno (acceleration), the accelerator is released and the clutch is pulled (thus disconnecting the crankshaft from the gearbox output shaft).<strong>the vehicle is made to slow down naturally, by inertia, until it stops.<\/strong> This period <strong>is also referred to<\/strong>, in the regulatory sphere, <strong>Coast-Down<\/strong>.<\/p>\n<p>During this natural deceleration of the vehicle, we are going to measure radial acceleration, this time negative.<\/p>\n<p><strong>This measurement is necessary to enable the same power balance to be applied to the vehicle placed on the rollers as we would have on the road<\/strong>, where, with a flat, straight road and no strong wind, <strong>the vehicle would be braked simply by internal leaks<\/strong> (friction of mechanical parts) and its resistance to air.<\/p>\n<p><strong>Using the velocity trend, measured over time, it is then possible to calculate the 'dissipated power'<\/strong>.<\/p>\n<h6><strong>DEFINITION OF POWER DISSIPATION<\/strong><\/h6>\n<p><strong>We can therefore define power dissipation as the sum of all those friction forces in which the engine dissipates its energy<\/strong>, <strong>to allow the vehicle to accelerate.<\/strong><\/p>\n<p>These include all the mechanical organisms of the transmission, ranging from the drive shaft <strong>to the point of contact between tyre and roller<\/strong>.<\/p>\n<h6><strong>CALCULATION OF POWER AT THE CRANKSHAFT<\/strong><\/h6>\n<p>Once the two test phases have been completed, to obtain a <strong>precise measurement of power at the crankshaft,<\/strong> the<strong> power dissipation <\/strong>is then<strong> added to the power measured at the wheel.<\/strong><\/p>\n<p>Reading the graphical results of the power test, <strong>we can deduce this data from the three curves depicted<\/strong>.<\/p>\n<ul>\n<li>One for power at the wheel (normally in the centre of the graph)<\/li>\n<li>One for 'dissipated' (lower part of the graph)<\/li>\n<li>One for the drive shaft (top of diagram)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div id=\"attachment_1463\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1463\" class=\"wp-image-1463 size-full\" src=\"https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance.jpg\" alt=\"\" width=\"800\" height=\"800\" srcset=\"https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance.jpg 800w, https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance-300x300.jpg 300w, https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance-150x150.jpg 150w, https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance-768x768.jpg 768w, https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance-600x600.jpg 600w, https:\/\/motycs.it\/wp-content\/uploads\/2023\/04\/nrp_performance-100x100.jpg 100w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><p id=\"caption-attachment-1463\" class=\"wp-caption-text\">4wd test bench double roller series<\/p><\/div>\n<h6>INSIGHTS<\/h6>\n<ul>\n<li><a href=\"https:\/\/motycs.it\/en\/dyno-test-benches-history\/\"><b>History of dyno test benches<\/b><\/a><\/li>\n<li><strong><a href=\"https:\/\/motycs.it\/en\/single-roller-double-roller-dynamometers\/\">SINGLE-roller Vs. DOUBLE-roller benches, which one to choose<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/motycs.it\/en\/4wd-dynamometers\/\">Advantages of 4\u00d74 dynos with linked axles<\/a><\/strong><\/li>\n<li><a href=\"https:\/\/motycs.it\/en\/power-correction-factors\/\"><b>Power correction factors DIN, CE, SAE..<\/b><\/a><\/li>\n<li><strong><a href=\"https:\/\/motycs.it\/en\/homologations-daq-systems\/\">Homologation and C.O.P. test benches<\/a><\/strong> fields of application<\/li>\n<\/ul>\n<h6>OUR PRODUCTS AND SERVICES<\/h6>\n<ul>\n<li><a href=\"https:\/\/motycs.it\/en\/product-category\/banchi-prova-potenza\/\"><strong>Our range of chassis dynamometers<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/motycs.it\/en\/product-category\/sistemi-di-controllo\/\"><strong>DAQ systems<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/motycs.it\/en\/product\/dyno-cells\/\"><strong>Soundproof engine test rooms<\/strong><\/a><\/li>\n<li><strong><a href=\"https:\/\/motycs.it\/en\/product\/cooling\/\">Engine cooling fan systems<\/a><\/strong><\/li>\n<li><a href=\"https:\/\/motycs.it\/en\/product\/exhaust-gas-extractions\/\"><strong>Exhaust gas extraction systems<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/motycs.it\/en\/engine-testing-services\/\"><strong>Engine and vehicle testing services<\/strong><\/a><\/li>\n<\/ul>\n<p><a href=\"https:\/\/motycs.it\/en\/contacts\/\"><strong>Contact us for more information<\/strong><\/a><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"vc_row-full-width vc_clearfix\"><\/div>","protected":false},"excerpt":{"rendered":"TeoriaCalcolo della potenza dissipata POTENZA ALL'ALBERO MOTORE Su un banco prova a rulli, la potenza all'albero \u00e8 l'unico valore di riferimento, anche perch\u00e8 NON influenzato da variabili in gioco tra cui: Tipologia pneumatici (invernali, estivi..) Pressione degli pneumatici Organi di trasmissioni inefficienti per usura o piccoli danneggiamenti E' inoltre l'unico valore di riferimento misurabile anche [...]","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1435","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Potenza dissipata - MOTYCS<\/title>\n<meta name=\"description\" content=\"Scopri cosa si intende per potenza dissipata nelle misurazioni sui banchi prova potenza a rulli di tipo frenato\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/motycs.it\/en\/power-losses-on-chassis-dynamometers\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Potenza dissipata - 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