Essays about: "Hertz contact"

Showing result 1 - 5 of 8 essays containing the words Hertz contact.

1. 1. Parametric Studies of Train-Track-Bridge Interaction : An evaluation of the dynamic amplification due to track irregularities for freight transport

   University essay from KTH/Bro- och stålbyggnad

   Author : Rasmus Elm Dahlman; Emil Lundberg; [2021]
   Keywords : Dynamics; dynamic amplification factor; railway bridge; train-track-bridge interaction; vehicle model; track irregularities; PSD; Dynamisk förstoringsfaktor; dynamik; järnvägsbroar; tåg-spår-bro interaktion; fordonsmodell; spårojämnheter; PSD;

   Abstract : In this thesis a train-track-bridge interaction (TTBI) model is developed in order to study the dynamic amplification from track irregularities on railway bridges traversed by freight trains. These simulations are of great importance since rail freight transport is expected to increase in order to meet the climate goals. READ MORE

3. 2. Modified train wheel wear calculation for fast calculation

   University essay from KTH/Spårfordon

   Author : Shaoyao Chen; [2021]
   Keywords : Precise contact point detection; Material Flexibility; Multiple contact points detection; Winkler theory; wear calculation; fast calculation; Exakt detektion av kontaktpunkter; materialflexibilitet; detektering av flera kontaktpunkter; Winkler-teori; förslitningsberäkning; snabb beräkning;

   Abstract : In this thesis, a modified wear calculation method is developed to calculate the train wheel wear, which can give less precise but faster results compared to the classic wear calculation method. This modified method is developed based on the classic wear calculation method developed by Jendel, which uses Hertz theory and Kalker’s simplified theory to calculate the contact variables and uses Achard theory to calculate the wear volume in an iterative manner. READ MORE

4. 3. Impact of Sidewall Pressure on High Voltage Cables

   University essay from Blekinge Tekniska Högskola/Institutionen för maskinteknik

   Author : Robin Berglind; [2018]
   Keywords : High Voltage Cable; Contact Mechanics; Finite element anlysis and Pressure film;

   Abstract : When a high voltage cable is transported throughout factory it is affected by sidewall pressure in cable bends between the roller supports and the cable. The problem is when the sidewall pressure is too high it will deform the cable which can have a negative impact on the conductivity of the cable. READ MORE

5. 4. Hertz contact influence on acoustic emission signals originating in radial bearings : Test rig construction and experimental evaluation

   University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Author : Joel Klippås; [2018]
   Keywords : Hertz contact; Acoustic emission; Radial bearings;

   Abstract : During the project a test rig was constructed in which experiments were performed on radial bearings to evaluate the acoustic emission amplitude and RMS value of the signal. The acoustic emission amplitude depends on the Hertz contact time, i.e. the time it takes for the Hertz contact to roll over its own contact length. READ MORE

6. 5. Towards the measurement of two independent viscoelastic functions using spherical indentation

   University essay from KTH/Hållfasthetslära (Inst.)

   Author : Hassan Mohammad; [2016]
   Keywords : ;

   Abstract : Instrumented indentation is a promising testing technique for obtaining the time dependent viscoelastic properties of bitumen and bitumen-based mastics. It offers several advantages: controlling the length scale of measurement and thus could be used in multi-scale modelling of asphalt, the possibility of in-situ tests and the minimal requirements of sample preparation. READ MORE