Essays about: "nonlinearity of air"

Found 4 essays containing the words nonlinearity of air.

  1. 1. Modelling and Control of an Extruder Cooling System

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Christopher Fritzon; Nils Persson; [2021]
    Keywords : Technology and Engineering;

    Abstract : The thesis aims to develop knowledge of the physics and thermodynamics behind a nonlinearity in an air cooling system for an plastic extruder machine. To accomplish this, both nonlinear and linearized models were set up in Matlab and Simulink environments based on the laws of physics and thermodynamics. READ MORE

  3. 2. Quality assurance of PVC by using Non-linear Acoustic Techniques

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Samira Eskandarmianji; [2013]
    Keywords : Nonlinear acoustic techniques; ultrasonic techniques; piezoelectric materials; sound wave velocity; sound wave attenuation; B A; second order nonlinearity parameter. ;

    Abstract : In this thesis, a Nonlinear Acoustic Technique (NAT) has been used to do a non-destructive quality assurance of plasticized polyvinyl chloride (PVC) specimens. The response of the specimen to an ultrasonic wave is analyzed in order to characterize its material properties. READ MORE

  4. 3. Travel demand forecasting with stated choice data. : Swedish domestic long-distance trips.

    University essay from KTH/Transportvetenskap

    Author : Qian Wang; [2011]
    Keywords : ;

    Abstract : The travel demand forecasting capability is affected by the model performance and is restricted by the available modes. The Sampers models being used in long distance travel demand forecasting doesn’t deal with nonlinearity and contains no travel service qualitative variables. READ MORE

  5. 4. Speaker that uses the non-linearity in air to create sound

    University essay from Blekinge Tekniska Högskola/Avdelningen för maskinteknik

    Author : Johan Fredin; [2005]
    Keywords : Parametric loudspeaker; Difference frequency generation; Biharmonic boundary condition; Nonlinear acoustics;

    Abstract : The aim of this work was to investigate theoretically and experimentally the fact that it is possible to create sound by using the nonlinearity in air. A speaker was built verifying the theory that if at least two high frequencies at high amplitude is propagating through a nonlinear medium, for example air, the difference frequency of these two is created in mid air. READ MORE