{"id":700445,"date":"2024-11-27T03:22:09","date_gmt":"2024-11-27T02:22:09","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=700445"},"modified":"2024-11-27T03:22:09","modified_gmt":"2024-11-27T02:22:09","slug":"phan-tich-nhiet-cua-he-thong-phanh","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/phan-tich-nhiet-cua-he-thong-phanh\/","title":{"rendered":"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh"},"content":{"rendered":"<p class=\"sidekick\">Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh: Hi\u1ec3u r\u00f5 c\u00e1ch nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t phanh, an to\u00e0n xe, v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3m thi\u1ec3u qu\u00e1 nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/phan_tich_nhiet_cua_he_thong_phanh.png\" alt=\"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ph\u00e2n T\u00edch Nhi\u1ec7t C\u1ee7a H\u1ec7 Th\u1ed1ng Phanh<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 v\u00f4 c\u00f9ng quan tr\u1ecdng v\u00e0 ph\u1ee9c t\u1ea1p. Khi h\u1ec7 th\u1ed1ng phanh ho\u1ea1t \u0111\u1ed9ng, nhi\u1ec7t sinh ra do ma s\u00e1t gi\u1eefa b\u00e1nh xe v\u00e0 \u0111\u0129a phanh (ho\u1eb7c tang tr\u1ed1ng phanh) c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a h\u1ec7 th\u1ed1ng phanh.<\/p>\n<h2>T\u1ea1i sao ph\u00e2n t\u00edch nhi\u1ec7t l\u1ea1i quan tr\u1ecdng?<\/h2>\n<p>Khi phanh xe, n\u0103ng l\u01b0\u1ee3ng \u0111\u1ed9ng h\u1ecdc c\u1ee7a xe chuy\u1ec3n \u0111\u1ed5i th\u00e0nh n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t do ma s\u00e1t. Nhi\u1ec7t n\u00e0y l\u00e0m t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn phanh, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 nh\u01b0:<\/p>\n<ul>\n<li>Gi\u1ea3m hi\u1ec7u qu\u1ea3 phanh: Khi nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao, ma s\u00e1t gi\u1eefa \u0111\u0129a phanh v\u00e0 m\u00e1 phanh s\u1ebd gi\u1ea3m, l\u00e0m cho hi\u1ec7u qu\u1ea3 phanh k\u00e9m \u0111i.<\/li>\n<li>M\u00f2n v\u1eadt li\u1ec7u: Nhi\u1ec7t \u0111\u1ed9 cao g\u00e2y m\u00f2n nhanh h\u01a1n c\u00e1c v\u1eadt li\u1ec7u c\u1ee7a h\u1ec7 th\u1ed1ng phanh.<\/li>\n<li>Bi\u1ebfn d\u1ea1ng v\u00e0 h\u01b0 h\u1ecfng: Nhi\u1ec7t c\u00f3 th\u1ec3 l\u00e0m bi\u1ebfn d\u1ea1ng c\u00e1c b\u1ed9 ph\u1eadn kim lo\u1ea1i v\u00e0 g\u00e2y h\u1ecfng h\u00f3c h\u1ec7 th\u1ed1ng phanh.<\/li>\n<\/ul>\n<h2>C\u00e1c Th\u00e0nh Ph\u1ea7n C\u1ee7a H\u1ec7 Th\u1ed1ng Phanh<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ea7n xem x\u00e9t khi ph\u00e2n t\u00edch nhi\u1ec7t:<\/p>\n<ol>\n<li><strong>\u0110\u0129a phanh ho\u1eb7c tang tr\u1ed1ng phanh:<\/strong> \u0110\u00e2y l\u00e0 b\u1ed9 ph\u1eadn ch\u1ecbu t\u00e1c \u0111\u1ed9ng nhi\u1ec7t tr\u1ef1c ti\u1ebfp khi phanh.<\/li>\n<li><strong>M\u00e1 phanh:<\/strong> Bao g\u1ed3m v\u1eadt li\u1ec7u ma s\u00e1t v\u00e0 l\u00e0 n\u01a1i t\u1ea1o ra ma s\u00e1t khi phanh.<\/li>\n<li><strong>D\u1ea7u phanh:<\/strong> Ch\u1ea5t l\u1ecfng n\u00e0y gi\u00fap truy\u1ec1n l\u1ef1c phanh t\u1eeb b\u00e0n \u0111\u1ea1p phanh \u0111\u1ebfn c\u00e1c b\u00e1nh phanh, nh\u01b0ng c\u0169ng c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t:<\/strong> Bao g\u1ed3m c\u00e1c l\u1ed7 th\u00f4ng gi\u00f3 ho\u1eb7c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t kh\u00e1c \u0111\u1ec3 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 c\u1ee7a h\u1ec7 th\u1ed1ng phanh.<\/li>\n<\/ol>\n<h2>C\u00e2n B\u1eb1ng Nhi\u1ec7t<\/h2>\n<p>\u0110\u1ec3 ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh, ch\u00fang ta c\u1ea7n ph\u1ea3i t\u00ednh to\u00e1n c\u00e2n b\u1eb1ng nhi\u1ec7t. Gi\u1ea3 s\u1eed xe \u0111ang di chuy\u1ec3n v\u1edbi v\u1eadn t\u1ed1c <i>v<\/i> v\u00e0 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng <i>m<\/i>, n\u0103ng l\u01b0\u1ee3ng \u0111\u1ed9ng h\u1ecdc c\u1ee7a xe l\u00e0:<\/p>\n<p>\\[ E_k = \\frac{1}{2}mv^2 \\]\n<p>Ph\u1ea7n l\u1edbn n\u0103ng l\u01b0\u1ee3ng n\u00e0y s\u1ebd chuy\u1ec3n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t <i>Q<\/i> do ma s\u00e1t, v\u00e0 ch\u00fang ta c\u00f3:<\/p>\n<p>\\[ Q = \\mu F_n d \\]\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\\(\\mu\\) l\u00e0 h\u1ec7 s\u1ed1 ma s\u00e1t gi\u1eefa m\u00e1 phanh v\u00e0 \u0111\u0129a phanh<\/li>\n<li>F<sub>n<\/sub> l\u00e0 l\u1ef1c n\u00e9n<\/li>\n<li><i>d<\/i> l\u00e0 kho\u1ea3ng \u0111\u01b0\u1eddng phanh<\/li>\n<\/ul>\n<h2>Ph\u01b0\u01a1ng Tr\u00ecnh Nhi\u1ec7t \u0110\u1ed9<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 c\u1ee7a h\u1ec7 th\u1ed1ng phanh, ch\u00fang ta c\u1ea7n s\u1eed d\u1ee5ng ph\u01b0\u01a1ng tr\u00ecnh d\u1eabn nhi\u1ec7t. V\u1edbi gi\u1ea3 thuy\u1ebft r\u1eb1ng h\u1ec7 th\u1ed1ng phanh l\u00e0 m\u1ed9t v\u1eadt r\u1eafn \u0111\u1ed3ng nh\u1ea5t, ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng tr\u00ecnh nhi\u1ec7t \u0111\u1ed9 c\u1ee7a Fourier:<\/p>\n<p>\\[ \\frac{\\partial T}{\\partial t} = \\alpha \\nabla^2 T \\]\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>T l\u00e0 nhi\u1ec7t \u0111\u1ed9<\/li>\n<li>t l\u00e0 th\u1eddi gian<\/li>\n<li>\\(\\alpha\\) l\u00e0 h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t<\/li>\n<li>\\(\\nabla^2\\) l\u00e0 to\u00e1n t\u1eed Laplace<\/li>\n<\/ul>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh kh\u00f4ng ch\u1ec9 gi\u00fap hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng phanh m\u00e0 c\u00f2n gi\u00fap thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t hi\u1ec7u qu\u1ea3 h\u01a1n, gi\u1ea3m thi\u1ec3u nguy c\u01a1 h\u1ecfng h\u00f3c v\u00e0 t\u0103ng \u0111\u1ed9 b\u1ec1n cho h\u1ec7 th\u1ed1ng phanh. C\u00e1c k\u1ef9 s\u01b0 ph\u1ea3i s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh l\u00fd thuy\u1ebft v\u00e0 m\u00f4 ph\u1ecfng m\u00e1y t\u00ednh \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 nhi\u1ec7t trong h\u1ec7 th\u1ed1ng phanh, \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3 cao nh\u1ea5t cho c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a h\u1ec7 th\u1ed1ng phanh: Hi\u1ec3u r\u00f5 c\u00e1ch nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t phanh, an to\u00e0n xe, v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3m thi\u1ec3u qu\u00e1 nhi\u1ec7t.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with 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