Measuring the flexibility of vehicle suspension components

Tato bakalářská práce se zabývá popisem kinematiky a elastokinematiky náprav vozidel, návrhem a výrobou přípravku pro měření poddajnosti jednotlivých komponent podvozku, a následným provedením měření a vyhodnocením dat. Cílem je vyjádřit průběh tuhosti součástí podvozku vozu Formule Student Dragon X, která bude přiřazena počitačovému modelu podvozku v multi-body softwaru, čímž se dosáhne realističtějšího výpočtového modelu pro návrh kinematiky a dynamiky vozidla.This bachelor’s thesis describes suspension kinematics and elastokinematics of vehicle axles, contains the design and manufacturing method of a jig, designed to measure kinematic complience of each suspension assembly, and deals with the measuring process and data evaluation. The goal is to measure the stiffness behaviour of suspension components of a Formula Student car Dragon X and to assign it to a multi-body software suspension model, which will result in a more detailed vehicle model, to achieve simulations that are closer to reality.

Mafické enklávy z granitoidů vystupujících v širším okolí Blanska

Mafic microgranular enclaves (MME) and associated host rocks occuring in the east granodiorite part of the Brno massif were studied petrologically and geochemically to establish their origin and to investigate the processes involved in their differentiation. Scarce enclaves display preserve narrow chilled margins. Many of enclaves show obvious similarities to their associated host rocks: they contain the identical mineral phases as their host rock, nevertheless the content of mafic minerals (biotite and hornblende) and opaque minerals is somewhat higher. Both types of rocks show some similar geochemical trends. Zoned plagioclase megacrysts in some enclaves contain anhedral cores jacketed by euhedral rim. These plagioclases could represent xenocrysts of early crystallised host rock phases mechanically accreted inward the liquid of enclaves. Acicular crystals of apatite and tiny lathy plagioclase in matrix are indicative of rapid crystallization of the enclaves liquid. Host rocks display intermediate to acid composition, while the enclaves are more basic. Macroscopic, microscopic and geochemical features indicate that the MME are products of mingling and incompletely mixing between a basic end member and host rocks of more acid composition

Siderite crystals from the Lower Carboniferous aleuropelites in Hrabůvka (Culm of the Nízký Jeseník Upland)

Fine siderite crystals form abundant druses coating walls of open fissures in the Lower Carboniferous aleuropelites of the Hrabůvka Quarry. Siderite crystals are composed of 76.2–78.9 mol. % siderite, 9.9–13.0 mol. % calcite, 9.5–11.0 mol. % magnesite, and 0.0–0.9 mol. % rhodochrosite. Locally, small isometric crystals of calcite (2.4–2.8 wt. % FeO, 0.1–0.2 wt. % MgO, 0.07–0.08 wt. % MnO) preceded crystallization of siderite. In addition, small colourless rhombs of almost pure calcite also can overgrow siderite crystals. Siderite contains small all-liquid aqueous fluid inclusions suggesting very low crystallization temperatures. Stable isotope data (δ13C = -6.1 ‰ PDB, δ18O = -5.4 ‰ PDB) are comparable to those of local Tertiary sediments and vein mineralizations that are partly associated with these sediments. It is concluded that the origin of the siderite was probably also related to the Cenozoic reactivation and associated fluid circulation.Fine siderite crystals form abundant druses coating walls of open fissures in the Lower Carboniferous aleuropelites of the Hrabůvka Quarry. Siderite crystals are composed of 76.2–78.9 mol. % siderite, 9.9–13.0 mol. % calcite, 9.5–11.0 mol. % magnesite, and 0.0–0.9 mol. % rhodochrosite. Locally, small isometric crystals of calcite (2.4–2.8 wt. % FeO, 0.1–0.2 wt. % MgO, 0.07–0.08 wt. % MnO) preceded crystallization of siderite. In addition, small colourless rhombs of almost pure calcite also can overgrow siderite crystals. Siderite contains small all-liquid aqueous fluid inclusions suggesting very low crystallization temperatures. Stable isotope data (δ13C = -6.1 ‰ PDB, δ18O = -5.4 ‰ PDB) are comparable to those of local Tertiary sediments and vein mineralizations that are partly associated with these sediments. It is concluded that the origin of the siderite was probably also related to the Cenozoic reactivation and associated fluid circulation

Basic dykes with pyroxene in the vicinity of Blansko

Three mafic dykes found in the vicinity of Blansko were examined petrographically. One of them was studied geochemically. All three dykes contain clinopyroxene as phenocrysts (sometimes pseudomorphosed by hornblende) or in the groundmass with lathy plagioclases in the central parts of the dykes. Plagioclase usually takes the form of euhedral phenocrysts toward the contact with the host rock. Also, the structure changes from ophitic in the central parts to porphyric along the contact. Studied dykes display modal composition of microdiorites and porphyric microdiorites respectively. The dyke from Čertův Hrádek (no. 1) shows a noticeable geochemical similarity compared with the Hercynian dykes of porphyric microdiorites (diorite porphyrites) of the eastern granodiorite part of the Brno Massif studied by Hanžl et al. (1995). The dyke is formed by basaltic andesite based on the alkali/SiO2 ratio with features of calc-alkaline within plate basalt due to content of some trace elements or non-orogenic basalt account on content of Ti in pyroxenes (Leterrier et al. 1982).Three mafic dykes found in the vicinity of Blansko were examined petrographically. One of them was studied geochemically. All three dykes contain clinopyroxene as phenocrysts (sometimes pseudomorphosed by hornblende) or in the groundmass with lathy plagioclases in the central parts of the dykes. Plagioclase usually takes the form of euhedral phenocrysts toward the contact with the host rock. Also, the structure changes from ophitic in the central parts to porphyric along the contact. Studied dykes display modal composition of microdiorites and porphyric microdiorites respectively. The dyke from Čertův Hrádek (no. 1) shows a noticeable geochemical similarity compared with the Hercynian dykes of porphyric microdiorites (diorite porphyrites) of the eastern granodiorite part of the Brno Massif studied by Hanžl et al. (1995). The dyke is formed by basaltic andesite based on the alkali/SiO2 ratio with features of calc-alkaline within plate basalt due to content of some trace elements or non-orogenic basalt account on content of Ti in pyroxenes (Leterrier et al. 1982)

Mineralogy of sulphide, arzenide and telluride mineralization in cordierite-bearing pegmatite from the Bory Quarry near Velké Meziříčí (Strážek Moldanubicum)

Sulphide, arzenide and telluride mineralization was found in the cordierite-bearing pegmatite from the Bory Quarry near Velké Meziříčí. The quarry is situated in granulites of the Bory Granulite Massif that are penetrated by veins and irregular bodies of several paragenetically distinct types of pegmatites. Besides common minerals, the cordierite-bearing pegmatite contains minor amount of ore minerals such as pyrite, arsenopyrite (with up to 0.05–0.12 apfu Co) and löllingite (with up to 0.17 apfu Ni). Tiny inclusions of empressite (Ag7Te5) and unnamed Bi5Te3 phase (with 0.74 apfu S) occur as inclusions in löllingite.Sulphide, arzenide and telluride mineralization was found in the cordierite-bearing pegmatite from the Bory Quarry near Velké Meziříčí. The quarry is situated in granulites of the Bory Granulite Massif that are penetrated by veins and irregular bodies of several paragenetically distinct types of pegmatites. Besides common minerals, the cordierite-bearing pegmatite contains minor amount of ore minerals such as pyrite, arsenopyrite (with up to 0.05–0.12 apfu Co) and löllingite (with up to 0.17 apfu Ni). Tiny inclusions of empressite (Ag7Te5) and unnamed Bi5Te3 phase (with 0.74 apfu S) occur as inclusions in löllingite

Basic dykes with pyroxene in the vicinity of Blansko

Three mafic dykes found in the vicinity of Blansko were examined petrographically. One of them was studied geochemically. All three dykes contain clinopyroxene as phenocrysts (sometimes pseudomorphosed by hornblende) or in the groundmass with lathy plagioclases in the central parts of the dykes. Plagioclase usually takes the form of euhedral phenocrysts toward the contact with the host rock. Also, the structure changes from ophitic in the central parts to porphyric along the contact. Studied dykes display modal composition of microdiorites and porphyric microdiorites respectively. The dyke from Čertův Hrádek (no. 1) shows a noticeable geochemical similarity compared with the Hercynian dykes of porphyric microdiorites (diorite porphyrites) of the eastern granodiorite part of the Brno Massif studied by Hanžl et al. (1995). The dyke is formed by basaltic andesite based on the alkali/SiO2 ratio with features of calc-alkaline within plate basalt due to content of some trace elements or non-orogenic basalt account on content of Ti in pyroxenes (Leterrier et al. 1982).Three mafic dykes found in the vicinity of Blansko were examined petrographically. One of them was studied geochemically. All three dykes contain clinopyroxene as phenocrysts (sometimes pseudomorphosed by hornblende) or in the groundmass with lathy plagioclases in the central parts of the dykes. Plagioclase usually takes the form of euhedral phenocrysts toward the contact with the host rock. Also, the structure changes from ophitic in the central parts to porphyric along the contact. Studied dykes display modal composition of microdiorites and porphyric microdiorites respectively. The dyke from Čertův Hrádek (no. 1) shows a noticeable geochemical similarity compared with the Hercynian dykes of porphyric microdiorites (diorite porphyrites) of the eastern granodiorite part of the Brno Massif studied by Hanžl et al. (1995). The dyke is formed by basaltic andesite based on the alkali/SiO2 ratio with features of calc-alkaline within plate basalt due to content of some trace elements or non-orogenic basalt account on content of Ti in pyroxenes (Leterrier et al. 1982)

Arc-like magmatism in syn- to post-collisional setting: The Ediacaran Angra Fria Magmatic Complex (NW Namibia) and its cross-Atlantic correlatives in the south Brazilian Florianópolis Batholith

Ediacaran syn-tectonic plutonic rocks (amphibole gabbros, quartz diorites/tonalites to biotite- and muscovite-bearing granites) of the Angra Fria Magmatic Complex (Kaoko Belt, north-western Namibia) belong to two compositionally similar, magnesian, transitional tholeiitic–calc-alkaline suites, the Older (∼625–620 Ma) and the Younger (∼585–575 Ma). Both have counterparts in the broadly contemporaneous Florianópolis Batholith (southern Brazil), from which they were separated during the Cretaceous opening of the southern Atlantic. In the Angra Fria Magmatic Complex, the only unequivocal mantle contributions are identified in mingling zones of the Younger Suite and hybrid mafic–intermediate dykes of uncertain age. Previously published Hf-in-zircon isotopic data, together with new whole-rock geochemical and Sr–Nd isotopic signatures, underline an important role of crustal anatexis of a material with late Palaeoproterozoic to early Mesoproterozoic mean crustal residence (1.9–1.5 Ga). This interval resembles some of the published Nd model ages for Tonian ‘Adamastor Rift’-related felsic magmatic rocks in the Namibian Coastal and Uruguayan Punta del Este terranes. In detail, the Older Suite probably originated mainly by fluid-present melting of metabasalts and metatonalites, followed by (near) closed-system fractional crystallization (with or without accumulation) of amphibole ± plagioclase. For the Younger Suite, the principal process was the dehydration melting of relatively felsic lower crustal protoliths (metagreywackes or intermediate–acid orthogneisses >> metapelites), leaving garnet in the residue. Based on the geological context, the conspicuous enrichment of hydrous-fluid-mobile large ion lithophile over the conservative high field strength elements is not interpreted through a classic model of oceanic plate subduction, devolatilization, and fluxed-melting of the overriding mantle wedge. Instead, it is thought to reflect high-grade metamorphism of deeply buried continental crust and attendant water-fluxed melting of the overlying crustal lithologies, connected with inversion of the Tonian ‘Adamastor Rift’

Smluvní formy organizace práce a odměňování ve s.p. Strojosvit Krnov

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