{"id":4642,"date":"2014-08-02T11:00:32","date_gmt":"2014-08-02T11:00:32","guid":{"rendered":"http:\/\/www.rc-tabor.com\/wordpress\/?p=4642"},"modified":"2014-08-04T05:51:25","modified_gmt":"2014-08-04T05:51:25","slug":"maturitni-prace-jan-brich-popate-2","status":"publish","type":"post","link":"https:\/\/www.rc-tabor.com\/wordpress\/?p=4642","title":{"rendered":"Maturitn\u00ed pr\u00e1ce \u2013 Jan Brich po\u0161est\u00e9\u2026…"},"content":{"rendered":"

\"Honza<\/p>\n

Praktick\u00e1 \u010d\u00e1st\u00a0a tv\u016fr\u010d\u00ed schopnosti \ud83d\ude42 …<\/p>\n

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<\/p>\n

11. Praktick\u00e1 \u010d\u00e1st<\/h2>\n

Pro testov\u00e1n\u00ed byl pou\u017eit model viz. Obsah [3] a [4] z\u00e1kladn\u00ed popis a nastaven\u00ed modelu. D\u00edky zku\u0161enostem a praxi v\u00a0tomto oboru jsem stanovil z\u00e1kladn\u00ed nastaven\u00ed, kter\u00e9 m\u00e1 p\u0159edv\u00eddateln\u00e9 chov\u00e1n\u00ed. Od toho nastaven\u00ed budu testovat t\u0159i stanoven\u00e9 c\u00edle pro praktickou \u010d\u00e1st maturitn\u00ed pr\u00e1ce. Mezi c\u00edle pat\u0159\u00ed volba pneumatik, nastaven\u00ed svornosti zadn\u00edho diferenci\u00e1lu a tuhost zadn\u00edch vinut\u00fdch pru\u017ein.<\/p>\n

11.1 Z\u00e1kladn\u00ed nastaven\u00ed<\/h4>\n

Pneumatiky:<\/strong> ARP RALLY BLOCK<\/p>\n

Sv\u011btl\u00e1 v\u00fd\u0161ka: <\/strong>vp\u0159edu\u00a013mm, vzadu\u00a011mm<\/p>\n

Maxim\u00e1ln\u00ed v\u00fd\u0161ka: <\/strong>vp\u0159edu\u00a022mm, vzadu\u00a025mm<\/p>\n

Diferenci\u00e1ly:<\/strong> vp\u0159edu planetov\u00fd, vzadu kuli\u010dkov\u00fd<\/p>\n

Odklon kol:<\/strong> p\u0159edn\u00ed n\u00e1prava\u00a0-1\u00b0, zadn\u00ed n\u00e1prava\u00a0-1\u00b0<\/p>\n

Sb\u00edhavost:<\/strong> p\u0159edn\u00ed n\u00e1prava\u00a00\u00b0, zadn\u00ed n\u00e1prava\u00a01\u00b0<\/p>\n

Tlumi\u010de: <\/strong>st\u0159edn\u011b tuh\u00e9 vinut\u00e9 pru\u017einy<\/p>\n

 <\/p>\n

Jeliko\u017e testov\u00e1n\u00ed bylo napl\u00e1nov\u00e1no na zimn\u00ed obdob\u00ed, ob\u00e1val jsem se \u0161patn\u00e9ho po\u010das\u00ed, kter\u00e9 by v\u00a0p\u0159\u00edpad\u011b de\u0161tiv\u00e9ho \u010di sn\u011bhov\u00e9ho po\u010das\u00ed zabr\u00e1nilo testu. Zima tuto hrozbu nevyplnila a test se mohl uskute\u010dnit za kr\u00e1sn\u00e9ho slune\u010dn\u00e9ho po\u010das\u00ed a teplot atakuj\u00edc\u00edch 12 stup\u0148\u016f celsia . Vybral jsem rozlehlou asfaltovou plochu s\u00a0velmi hladk\u00fdm povrchem bez ne\u010distot a jin\u00fdch p\u0159edm\u011bt\u016f v\u00a0dr\u00e1ze vozu. Testovac\u00ed \u00fasek jsem zhotovil dle z\u00e1kladn\u00edho nastaven\u00ed a zna\u010d\u00ed ho \u017elut\u00e1 \u010d\u00e1ra v\u00a0ose vozu o polom\u011bru 130 cm. Vzhledem k\u00a0tomu, \u017ee model nem\u00e1 p\u0159evodovku, stanovil jsem podle GPS v\u00a0mobiln\u00edm telefonu rychlost vozu na 24 km\/h. Model pot\u0159ebuje na z\u00edsk\u00e1n\u00ed t\u00e9to rychlosti \u00fasek dlouh\u00fd 200 cm. Po ujet\u00ed t\u00e9to dr\u00e1hy v\u016fz doraz\u00ed k \u010derven\u00e9 \u010d\u00e1\u0159e adv\u011bmamodr\u00fdm \u010dar\u00e1m ve vzd\u00e1lenosti 20 cm, kter\u00e9 jdou p\u0159esn\u011b na st\u0159edu osy. V\u00a0tomto moment\u011b mus\u00ed b\u00fdt model p\u0159esn\u011b mezi t\u011bmito \u010darami a testovac\u00ed pilot v\u00a0tomto bod\u011b zato\u010d\u00ed ve sm\u011bru \u017elut\u00e9 vod\u00edc\u00ed osy doprava. M\u011b\u0159en\u00ed se odehr\u00e1v\u00e1 na \u010derven\u00e9 ose pod \u00fahlem 90\u00b0 oproti po\u010d\u00e1tku m\u011b\u0159en\u00ed. D\u00edky dv\u011bma kamer\u00e1m jsem sn\u00edmal z\u00a02 pohled\u016f pr\u016fjezdy voz\u016f a mohl tak zaznamen\u00e1vat odchylky p\u0159i zm\u011bn\u011b nastaven\u00ed. Pro sn\u00edm\u00e1n\u00ed videa jsem pou\u017eil kamery GoPro Hero 2 u kter\u00fdch lze nato\u010den\u00e9 z\u00e1b\u011bry zpomalit a z\u00edskat tak detailn\u00ed z\u00e1b\u011br modelu.<\/p>\n

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11.2 Testovac\u00ed \u00fasek<\/h4>\n

\"obr.38\"<\/p>\n

Obr.39<\/strong><\/p>\n

Vzhledem k\u00a0proj\u00ed\u017ed\u011bn\u00ed testovac\u00edho \u00faseku a nutn\u00e9mu zapisov\u00e1n\u00ed nam\u011b\u0159en\u00edch hodnot mi byl n\u00e1pomocen dobrovoln\u00edk, kter\u00fd se staral o nahr\u00e1v\u00e1n\u00ed z\u00e1znamu a zapisov\u00e1n\u00ed odchylek v\u00a0bod\u011b m\u011b\u0159en\u00ed. Zapisov\u00e1n\u00ed prob\u00edhalo n\u00e1sledovn\u011b. Testovac\u00ed jezdec po ka\u017ed\u00e9m pr\u016fjezdu zastavil za zat\u00e1\u010dkou a zapisuj\u00edc\u00ed dobrovoln\u00edk zaznamenal dr\u00e1hu modelu. Jezdec takto opakoval pr\u016fjezd p\u0159ibli\u017en\u011b 30x. Po t\u00e9to sekci pr\u016fjezd\u016f jsme z\u00a0kamer vyhodnotili 10 nejlep\u0161\u00edch pokus\u016f, kter\u00e9 byly zaznamen\u00e1ny do tabulky.<\/p>\n\n\n\n
\n\n\n\n\n
\"obr.39\"Obr.40 Pohled na testovac\u00ed \u00fasek<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n
1. Kamera \u010d\u00edslo 2<\/strong>2. Kamera \u010d\u00edslo 1<\/strong>3. Rozjezdov\u00fd \u00fasek<\/strong><\/p>\n

4. \u00dasek pot\u0159ebn\u00fd pro zrychlen\u00ed na 24km\/h<\/strong><\/p>\n

5. Po\u010d\u00e1tek m\u011b\u0159en\u00ed<\/strong><\/p>\n

6. Z\u00e1kladn\u00ed osa<\/strong><\/p>\n

7. Osa m\u011b\u0159en\u00ed<\/strong><\/p>\n

 <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

12. Chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b svornosti zadn\u00edho diferenci\u00e1lu<\/h2>\n

Zadn\u00ed diferenci\u00e1l ovliv\u0148uje z\u00a0velk\u00e9 \u010d\u00e1sti chov\u00e1n\u00ed zadn\u00ed \u010d\u00e1sti vozu p\u0159i pr\u016fjezdu zat\u00e1\u010dkou. Pro m\u011b\u0159en\u00ed jsem pou\u017eil kuli\u010dkov\u00fd diferenci\u00e1l, u kter\u00e9ho lze jednodu\u0161e m\u011bnit svornost pomoc\u00ed areta\u010dn\u00edho \u0161roubu. O tomto diferenci\u00e1lu je v\u00edce informac\u00ed v\u00a0bod\u011b [10.2]. Pro m\u011b\u0159en\u00ed diferenci\u00e1lu jsem stanovil t\u0159i hodnoty a to maxim\u00e1ln\u00ed svornost (max. dota\u017een\u00fd diferenci\u00e1l-nulov\u00fd prokluz), st\u0159edn\u00ed svornost (st\u0159edn\u011b dota\u017een\u00fd diferenci\u00e1l-st\u0159edn\u00ed prokluz) a minim\u00e1ln\u00ed svornost (min. dota\u017een\u00fd diferenci\u00e1l-velk\u00fd prokluz). Nam\u011b\u0159en\u00e9 hodnoty jsem zapsal do p\u0159ilo\u017een\u00e9 tabulky. Minim\u00e1ln\u00ed a maxim\u00e1ln\u00ed hodnoty jsou ozna\u010deny \u017elutou barvou. Tyto nep\u0159esnosti mohly vzniknout nep\u0159edv\u00eddatelnou ud\u00e1lost\u00ed, nap\u0159\u00edklad ne\u010distotou na vozovce.<\/p>\n

\"obr.41\"<\/p>\n

Obr.41<\/strong><\/p>\n

\u00a0Z\u00a0takto z\u00edskan\u00fdch hodnot jsem pro p\u0159ehlednost vytvo\u0159il spojnicov\u00fd graf, kter\u00fd ukazuje odchylku od z\u00e1kladn\u00ed osy v\u00a0cm.<\/p>\n

\"obr.42\"<\/p>\n

Obr.42<\/strong><\/p>\n

Jak je vid\u011bt z\u00a0grafu, tak modr\u00e1 k\u0159ivka je od z\u00e1kladn\u00ed osy hodn\u011b vych\u00fdlena, ale z\u00e1rove\u0148 m\u011bl model p\u0159edv\u00eddateln\u00e9 chov\u00e1n\u00ed a pr\u016fjezdy byly velmi srovnateln\u00e9. Toto nastaven\u00ed je bohu\u017eel siln\u011b nedot\u00e1\u010div\u00e9 a model se kv\u016fli velk\u00e9mu prokluzu chov\u00e1 jako 2wd (pohon p\u0159edn\u00ed n\u00e1pravy). Naopak zelen\u00e1 k\u0159ivka ukazuje velkou nevyrovnanost pr\u016fjezd\u016f. Model v\u00a0n\u011bkter\u00fdch pr\u016fjezdech dosahoval men\u0161\u00edch polom\u011br\u016f oto\u010den\u00ed, ale vzhledem k\u00a0velmi neklidn\u00e9 z\u00e1di vozu bylo jeho \u0159\u00edzen\u00ed obt\u00ed\u017en\u00e9 a \u010dasto do\u0161lo k\u00a0\u010d\u00e1ste\u010dn\u00e9mu p\u0159eto\u010den\u00ed modelu. Nejlep\u0161\u00edho ovl\u00e1d\u00e1n\u00ed a pr\u016fjezd\u016f dosahoval model se st\u0159edn\u00ed svornost\u00ed, na grafu jej zn\u00e1zor\u0148uje \u010derven\u00e1 k\u0159ivka. Takto nastaven\u00fd diferenci\u00e1l byl dob\u0159e p\u0159edv\u00eddateln\u00fd, model netrp\u011bl nedot\u00e1\u010divost\u00ed, ale z\u00e1rove\u0148 se v\u00fdrazn\u011b nep\u0159et\u00e1\u010del.<\/p>\n

Pro p\u0159edstavu jak dan\u00e9 testov\u00e1n\u00ed prob\u00edhalo, p\u0159ikl\u00e1d\u00e1m zpomalen\u00e9 video, kde se jednotliv\u00e9 modely prol\u00ednaj\u00ed a ukazuj\u00ed tak rozd\u00edly mezi jednotliv\u00fdmi \u00fapravami.,<\/p>\n

http:\/\/youtu.be\/vN-nAAGwodI<\/div>\n

A p\u0159ejdeme na praktickou \u010d\u00e1st – chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b pneumatik…<\/p>\n","protected":false},"excerpt":{"rendered":"

Praktick\u00e1 \u010d\u00e1st\u00a0a tv\u016fr\u010d\u00ed schopnosti \ud83d\ude42 …      <\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4642","post","type-post","status-publish","format-standard","hentry","category-ostatni"],"_links":{"self":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4642","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4642"}],"version-history":[{"count":0,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4642\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}