Essays about: "Low-Frequency"

Showing result 36 - 40 of 191 essays containing the word Low-Frequency.

  1. 36. Simulation of Mechanical Shock with Finite Element Analysis and Estimation of Shock Attenuation

    University essay from KTH/Hållfasthetslära

    Author : Cheng Qian; [2021]
    Keywords : shock; SRS; FEA; attenuation; chock; SRS; FEA; chockdämpning;

    Abstract : Space equipment is often subjected to mechanical shocks. Some devices like electronics are sensitive to shocks, and they can easily be damaged. To protect these devices, it is important to study shock penetrations in space structures. The Finite Element Method is an effective tool to simulate response to transient excitations. READ MORE

  3. 37. State of the Art Report on Cement Based Grout Properties and Dynamic Grouting

    University essay from KTH/Jord- och bergmekanik

    Author : Bowen Meng; [2021]
    Keywords : Dynamic grouting; filtration; rheology; grouting phase;

    Abstract : Dynamic grouting in rock mass has been studied since 1985 while desired penetration in rock masses with fine fractures is still a challenge because of uncertainty and complexity in the grouting process. This has attracted the attention of researchers in different countries and regions, especially in some Nordic countries such as Sweden. READ MORE

  4. 38. Sound Propagation Through Walls

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Alexander Berglund; Fredrik Herbai; Jonas Wedén; [2021]
    Keywords : acoustics; wave propagation; infrasound; finite difference methods; SBP-SAT; one dimension; analytical calculation; numerical simulation;

    Abstract : Infrasound is undetectable by the human ear and excessive exposure may be a substantial health risk. Low frequency sound propagates through walls with minimal attenuation, making it difficult to avoid. This study interprets the results from both analytical calculations and simulations of pressure waves propagating through a wall in one dimension. READ MORE

  5. 39. Geological characterisation of geophysical lineaments as part of the expanded site descriptive model around the planned repository site for high-level nuclear waste, Forsmark, Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Aron Bakker; [2021]
    Keywords : Forsmark; deformation zones; Svecokarelian; Sveconorwegian; ductile-brittle transition; brittle deformation; mylonite; Earth and Environmental Sciences;

    Abstract : The Swedish Nuclear Fuel and Waste Management Co. (SKB) started a project in 2020 near Forsmark, Sweden with the aim to expand the deformation zone model to encompass the entire catchment area around the planned repository for spent nuclear fuel. READ MORE

  6. 40. Quantifying Middle Frequency Transient Currents in Power Consuming Devices

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Alex Lundvall; Vincent Sollie; [2021]
    Keywords : ;

    Abstract : The complexity of electrical systems present in vehicles is continuously rising and the number of interconnected electrical devices is growing during the strive for optimization and reaching higher efficiency levels. Actuation of said devices have the possibility of injecting voltage and current harmonics into the system, thus negatively affecting neighbouring devices. READ MORE