Ultrasonic Non Destructive Testing
Hello Everyone, It's about my graduate thesis, I ve been trying to make an analysis which is NDT. There is a specimen, transducer, and cylinder( for showing to cracks-voids) I can't send a sound from...
View Articleultrasonic testing of steel by normal probe- wall echo
Hi, I am trying to simulate ultrasonic testing of steel by normal probe. A 2D model was built. The probe is defined as Lead Zirconate Titanate(PZT-5H) and generates a sine wave to the steel. Is there...
View ArticlePiezoelectric material in Water Simulation
Hi all, I am trying to build a 3-D PZT 5H cube and put it in water and simulate it to get the impedance vs. frequency. I could build the PZT cube, but found trouble to put it in water. I am adding a...
View ArticleHow to set up a vibrating capacitive membrane?
Hi, I am working on a capacitive membrane set in vibration by ac+dc voltage. My physics (in order) is: 1. ALE 2. ES 3. Solid I setup a time dependent 2D study and created a global variable Vac= Asinwt...
View ArticlePlasma chemistry assumption
Hello everybody I am modelling a plasma actuator used for aerospace application (boundary layer separation control, airfoil leading edge flow separation control). I am having a trouble in finding any...
View Articleoptical mode analysis with the geometry affected by mechanical force
I'm doing optical mode analysis given that the geometry of my structure is deformed by mechanical force. The displacement can be easily calculated. THE question is how to calculate the optical mode...
View ArticleHow can I add a Sensitivity chart in Acoustics Module\Turtorial...
If possible, how to add a Sensitivity chart in Acoustics Module\Turtorial Models\baffled_membrane model, just like the Sensitivity chart in the model of Acoustics Module\Electroacoustic...
View ArticleAcoustic ultrasound diffreaction
Hello Believe me I wouldn't post this unless im about to give up, I tried dozens of dozen times with different modality for very long hours but I couldn't succeed. I'm relatively new on comsol and I...
View ArticleComplex Band Strucutre - Acoustics/Structural Mechanics
Hi In a typical phononic band structure calculation done within COMSOL the procedure is to define Floquet BC's and do a parametric sweep of the wave vector over a particular direction in the...
View Articlesound wave diffraction grating
Hi, if I want to make diffraction grating for ultrasound wave inside water, which modul you thing should I use? pressure acoustic-frequency domain or acoustic structure interaction? -- Greeting
View ArticleTunable FBAR in frequency domain
Dear All, I am trying to simulate a tunable FBAR starting from BTO material as medium. In frequency model I am trying to superimpose a RF signal with a predifined range of frequencies and a DC bias...
View ArticleTemperature change in Acoustic-Piezoelectric Interaction, Frequency domain
Hi all, I am trying to build the model of Quarzt Crystal Microbalance in air/water, and using Acoustic-Piezoelectric Interaction, Frequency domain. I want to investigate the change in frequency due to...
View ArticleModeling Acoustic Metamaterial
Hi, I want to model an 2D acoustic metamaterial in Comsol. My target is to apply acoustic waves along one side of the geometry and calculate the wave amplitude from opposite face of the geometry. I...
View ArticleWhy the generated voltage is negative? (in a piezoelectric pressure sensor,...
Hi, I am using frequency domain study to analyse a piezo sensor. But it is so strange that in some frequencies the generated voltage is negative, while in other frequencies it is positive. I do not...
View ArticleHow to set a specific acoustic pressure on a membrane?
Hi I am simulating a piezo pressure sensor in water (a sphere to represent). I need to add a specific acoustic pressure on the membrane. I tried the boundary in solid mechanics, boundary load->...
View Articlesteady state error
Hello, i'm studying ultrasound transducer and want to get transient response of output voltage for piezoelectric material. I set 'plane wave radiation' at one side of water domain, and i hope to get...
View Articlepartition coefficient
I am working in SAW gas sensor.I have taken ZnO as the thin film sensing layer and i want to sense nitrogen dioxide gas.But i am unable to get the air/ZnO partition coefficient in NO2. Can i get some...
View ArticleSimulating a solid cylinder with a transient displacement point source to get...
Hello, I have been trying to simulate a cylindrical model using structural mechanics(time dependent) with a transient displacement point source (0.00005*sin(2*3.14*3000*t)*e^(-((t-t0)^2)/(2*(sigma^2)))...
View Articlebaffled duct - PML 3D PROBLEM
Hello every one, I’d like to excite a cylindrical waveguide (rigid in one face and flanged in the other one) with a monopole located in M(x,y,z) and compute the pressure inside the duct. Also, compute...
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