20.500.12556/DKUM-39793 SUSPENSION AND STEERING SYSTEM DEVELOPMENT OF A FOUR WHEEL DRIVE AND FOUR WHEEL STEERED TERRAIN VEHICLE RAZVOJ OBES IN KRMILNEGA SISTEMA TERENSKEGA VOZILA S ŠTIRIMI GNANIMI IN ŠTIRIMI KRMILJENIMI KOLESI The key goal of doctoral thesis was to conceive, design, optimize, and analyze the suspension and steering systems for a four wheel drive and four wheel steered terrain vehicle. The common characteristic of a terrain vehicle is the greater motion of the wheels in order to protect the vehicle from rollover risk when running over rough terrain. Known suspension and steering systems have serious weaknesses. In order to ensure good driving comfort, efficient driving safety, and higher maneuverability, new principles of suspension and steering systems are proposed. The proposed suspension system has been successfully derived from a classical double wishbone control arm. The control arms are long but both equal. Greater wheel motion has been ensured without reducing driving performance. In order to improve the comfort and safety an optimal active damping force has been determined by the active and semi-active systems. On the basis of comprehensive analysis, active system adequacy has been achieved. The proposed suspension design provides relatively small lateral wheel motion, zero camber angles, and it effectively absorbs the vibrations caused by ground configurations. The goal of the developed steering system for this terrain vehicle was to design a new steering mechanism that would provide maneuverability at low speed and suitable stability at higher speed. This has been ensured by two modes of steering, all wheel steer and front wheel steer. The proposed steering mechanisms conform to Ackermann steering geometry for all modes and situations. A totally new steering concept has been developed. This effective design consists of special pairs of gears, known as’ non-circular gears’. Cilj doktorske disertacije je zasnovati, oblikovati, optimizirati in analizirati sistem obes in krmilja za štirikolesno vozilo, ki ima pogon in krmiljenje na vsa kolesa. Značilnost terenskih vozil so veliki pomiki koles, da se vozilo ne prevrne, ko se giblje po neravnem terenu. Znani sistemi obes in krmiljenja imajo slabosti. Za zagotavljanje višje udobnosti, varnosti vozila, in odzivnosti je treba razviti nove koncepte obes in nov krmilni sistem. Predlagan sistem obes je učinkovita modifikacija dvojnega A-mehanizma z enakima, a dolgima rokama, kar zagotavlja velike vertikalne pomike koles, brez poslabšanja voznih karakteristik. Optimalna sila dušenja, ki je potrebna za izboljšanje udobja in varnosti, se ustvarja z navideznim oziroma resničnim aktivnim sistemom, ki je dodan sitemu obes. Obširne analize dokazujejo upravičenost uporabe aktivnih sistemov. Predlagani sistem obes učinkovito absorbira vibracije zaradi neravnin in zagotavlja relativno majhno bočno pomikanje koles, brez nepotrebnega nagibanja. Cilj je razviti takšen krmilni sistem terenskega vozila, ki bi zagotavljal učinkovito upravljanje vozila pri nizkih hitrostih in zagotavljal stabilnost pri večjih hitrostih. To je izpolnjeno s krmiljem, ki deluje na dva različna načina. Pri enem načinu sta so aktivna vsa štiri kolesa, pri drugem pa samo sprednja. Predlagani krmilni mehanizem z gonili in gredmi deluje tako, da v vseh situacijah povsem sledi zakonitosti Ackermanna. Prikazan je koncept povsem novega principa učinkovitega krmilnega sistema, ki temelji na posebnih gonilih s specialnimi pari zobnikov. Terrain vehicle suspension system steering system four wheels steering Terensko vozilo obese sistem krmilni sistem štirikolesno krmiljenje true true false S. Lajqi] Angleški jezik Slovenski jezik Doktorska disertacija 2013-02-28 19:58:53 2013-03-18 13:23:50 2022-05-12 23:13:11 2021-04-13 03:18:03 2013 0 [Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 629.373.027.2/.3(043.3) 266199808 URN:SI:UM:DK:1SKZFDMY DR_Lajqi_Shpetim_2013.pdf DR_Lajqi_Shpetim_2013.pdf 1 5F3693524C5885526B9B23B21FF9F3BF be4d2fa9a699859c543721ea6b75c1ce76aafa22a4f5cde1a69449b5b138b4ad 36059e22-7c09-11eb-bb7a-00155d0001ca 20.500.12556/dkum/cbdb3fb3-9f24-4ca3-8891-aac1905cf98b https://dk.um.si/Dokument.php?lang=slv&id=54091 Fakulteta za strojništvo 0 0 0