• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Reducing Road Wear While Ensuring Comfort and Charging Constraints for Dynamically Charged Passenger Vehicles Through Noise Shaped Control Inputs

Ferrin, Clint Jay 01 May 2019 (has links)
Dynamically charged vehicles suffer from power-loss during wireless power transfer due to vehicle coil misalignment while driving. Autonomous dynamically charged vehicles can maximize wireless power transfer by following an optimal charging path, but the repeated precision increases road wear. To avoid unnecessary road wear and rutting, a path planner can intentionally inject variability into an autonomous vehicle’s path. However, introducing variability into an optimal charging path risks depleting battery life prior to destination arrival, and it increases rider discomfort. Therefore, a path planner is proposed that guarantees average charging criteria and ensures rider comfort while reducing road wear.
2

Studded tire wear - comparison between British Pendulum and Pin on disc testing / Dubbdäcksnötning - jämförelse mellan Britisk Pendel ochPinne på skiva provning

Kozuka, Ryohei January 2017 (has links)
Studded tires are widely used during the winter season in the Nordic countries due to their performance qualities in extreme cold temperatures, however they cause wear on the road surface. This is not only an economic problem but also a health problem due to amount of airborne wear particles that are generated.  Therefore, a test method under controlled laboratory conditions for tire and road wear is needed. In this thesis,studded tire wear on concrete road samples are studied using two test equipments; a Pin on disc and a British pendulum rig test.  Three different types of concrete road materials and two different types of tire stud geometries were used in the study. The road sample wear ranks the same in both test equipment’s following the rebound hardness of the concrete material. For the two studded tires samples differences in the amount of wear could be noticed. One possible explanation here is the wear dependence on the velocity due to the difference in simulated vehicle speed for the two tests equipment’s. / Dubbdäck används i stor utsträckning under vintersäsongen i Norden på grund av deras prestandaegenskaper i kalla temperaturer. Ett problem med dubbdäck är att de orsakar slitage på vägytan. Detta är inte bara ett ekonomiskt problem utan också ett hälsoproblem då en del av slitaget är partiklar som är luftburna och inandningsbara. Därför finns det ett behov av testmetoder för däck och vägslitage i kontrollerad laboratoriemiljö. I denna studie utvärderas dubbdäcksnötning i två testutrustningar; den brittiska vägpendeln och en pinne-på-skiva maskin. Prov utfördes med tre olika vägvarianter av betong och två olika dubbgeometrier. Storleken på nötningen rankades den samma för de olika vägbeläggningarna i de två olika provutrustningarna. Dock så inverkade dubbgeometrin på resultatet och olika nivåer på vägslitage kunde noteras för de två dubbvarianterna i beroende på val av provutrustning. En möjlig förklaring kan vara ett hastighetsberoende av nötningen då de två olika provutrustningarna simulerar olika fordonshastigheter.

Page generated in 0.0314 seconds