Sökning: "nonlinear acoustics"

Hittade 5 uppsatser innehållade orden nonlinear acoustics.

1. 1. Quality Assessment of Thin Polymer Components using NonDestructive Testing : Degree Project for Master of Science in Mechanical Engineering with emphasis on Applied Mechanics

   Uppsats för yrkesexamina på avancerad nivå, Blekinge Tekniska Högskola/Institutionen för maskinteknik

   Författare :Markus Nilsson; Tom Carlén; [2019]
   Nyckelord :nondestructive testing; polymer; nonlinear acoustics; instant dynamics amplitude recovery.; oförstörande provning; polymer; olinjär akustik; instant dynamics amplitude recovery;

   Sammanfattning : Polymer components are used in many different applications, including in industries where critical applications put high requirements regarding quality assessment. Such applications might include medical or food where the presence of discontinuities might induce bacterial growth or other unpleasantries, thus certain manufacturers must be able to maintain a zero-tolerance towards damaged components. LÄS MER

3. 2. Examining the quality of extruded plastic with the nondestructive testing method NAW

   Master-uppsats, Blekinge Tekniska Högskola/Institutionen för maskinteknik

   Författare :Eva Jansson; Seyed Saeid Taghavi; [2014]
   Nyckelord :NAW®-method; Nondestructive Testing; Nonlinear Acoustics; Material Testing; Plastic; Ultrasonic Testing;

   Sammanfattning : Defects in a plastic floor material produced in Tarketts factory in Ronneby are causing waste of time and material since it is noticed too late in the production line. The objective of this thesis is to investigate if the nondestructive test method NAW®, which is developed by Acoustic Agree in Ronneby, can be a solution to find the defects at an earlier stage. LÄS MER

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

   Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

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

   Sammanfattning : 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. LÄS MER

5. 4. Analysis of the Behaviour of Standing Acoustic Waves in a Cubically Nonlinear Medium.

   Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för maskinteknik

   Författare :Chinenye Igweokpala; Onyema Umegboro; [2007]
   Nyckelord :Cubic nonlinear medium; perturbation solutions; shock regions; wave profile;

   Sammanfattning : The basic distinction between linear and nonlinear acoustics is given in the introductory part. The differences between nonlinear acoustic waves in quadratic and cubic media are briefly explained. The behavior of standing waves, including the wave profile evolution, is described. LÄS MER

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

   Magister-uppsats, Blekinge Tekniska Högskola/Avdelningen för maskinteknik

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

   Sammanfattning : 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. LÄS MER