Sökning: "friction"

Visar resultat 1 - 5 av 828 avhandlingar innehållade ordet friction.

  1. 1. Control Systems with Friction

    Författare :Henrik Olsson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; control engineering; Automatiska system; Automation; robotics; Friction Observer; Friction Compensation; Describing Function Analysis; Limit Cycles; Friction Modeling; Friction; Control Systems; robotteknik; reglerteknik;

    Sammanfattning : Friction-related problems are frequently encountered in control systems. This thesis treats three aspects of such problems: modeling, analysis, and friction compensation. A new dynamic friction model is presented and investigated. LÄS MER

  3. 2. Tactile Perception : Role of Friction and Texture

    Författare :Lisa Skedung; Mark Rutland; Siegfried Derler; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; NATURVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; SAMHÄLLSVETENSKAP; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; SOCIAL SCIENCES; human skin; tactile friction; finger friction; skin friction; skin tribology; biotribology; tactile perception; haptic perception; psychophysics; haptics; surface roughness; surface texture; contact area; nanostructure; model surfaces; surface wrinkling; printing paper; tissue paper; magnitude estimation; multidimensional scaling; tactile threshold; psychophysical relations; smoothness; coolness; coarseness; softness; force sensor; skin lipids; topical formulations; skin creams; taktil friktion; fingerfriktion; hudfriktion; hudtribologi; biotribologi; taktil perception; psykofysik; haptik; ytråhet; ytstruktur; ytveckning; nanostruktur; kontaktarea; modellytor; friktionskoefficient; kraftmätare; bestruket papper; obestruket papper; tryckpapper; mjukpapper; multidimensionell skalning; magnitud estimation; taktilt tröskelvärde; lenhet; mjukhet; svalhet; strävhet; hudlipider; topikala beredningar; hudkräm;

    Sammanfattning : Tactile perception is considered an important contributor to the overall consumer experience of a product. However, what physical properties that create the specifics of tactile perception, are still not completely understood. LÄS MER

  4. 3. Surfaces Designed for High and Low Friction

    Författare :Ulrika Pettersson; Staffan Jacobson; Roland Larsson; Uppsala universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Materials science; tribology; friction; surface texture; surface design; low friction; high friction; boundary lubrication; DLC; embossing; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : This thesis comprises tribological studies of extremely well-defined surfaces of different designs. Both low-friction and high-friction surfaces were manufactured and experimentally evaluated.In the low-friction studies, lithography and anisotropic etching of silicon was first used as a texturing technique. LÄS MER

  5. 4. Gear tribology : friction and surface topography

    Författare :Li Xiao; Bengt-Göran Rosén; Liam Blunt; Högskolan i Halmstad; []
    Nyckelord :Friction; Surface topography; Toughness; Lay; Gears; Power transmission; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The quest for energy efficiency leads to the development of highly efficient power transmissions for vehicles. Gears are some of the most rugged and durable torque transmitters among machine elements. Friction between sliding surfaces at gear teeth is one major source of power loss. LÄS MER

  7. 5. Surface Force and Friction : effects of adsorbed layers and surface topography

    Författare :Xiaoyan Liu; Per Claesson; Bjorn Torger Stokke; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Friction; nanotribology; surface forces; diblock copolymer; lipid; QCM-D; AFM; optical reflectometry; neutron reflectivity; X-ray reflectivity; micro-patterned surface; Kemi; Chemistry;

    Sammanfattning : Interfacial features of polymers are a complex, fascinating topic, and industrially very important. There is clearly a need to understand interactions between polymer layers as they can be used for controlling surface properties, colloidal stability and lubrication. The aim of my Ph. LÄS MER