impedance of transducer using comsol
when i simulate the impedance of transducer. a single PZT5H disc show one resonance and anti-resonance, respectively. but when add the matching layer, another resonance and anti-resonance appears. How...
View ArticleHow do you plot error in COMSOL Multiphysics V5.2?
While doing the simulation in COMSOL Multiphysics V5.2, I found that there were errors being plotted (for my case, it was from Convergence plot 1 and 2 I think). I would like to get this graphs for my...
View ArticleHelp with NASTRAN mesh import -> automatically assign explicits in geometry
Hello, thanks for reading this, I was wondering if I could get help with mesh loading. What I currently do with my simulations is take a mesh of the lungs and airways, and assign boundary conditions...
View ArticleHow to calculate the bandwidth of a transducer?
hello, As I know to calculate the bandwidth of a transducer, far-field calculation can be used. However, I don not know how to obtain the values from far-field pressure level polar plot. Using the...
View ArticleRandom vibration analysis
Hello, Anybody can explain clearly how to carry out random vibration analysis of design in Comsol? Is it really impossible to enter vibration Power Spectral Density (PSD) in current version of Comsol?
View ArticleAcoustic post processing.
Hello, This is Venkat Ganduri, Clemson graduate student. I am presently working on Comsol Acoustic module as part of my research. After I get the pressure plot I have given a condition in which the...
View Articlephononic crystals
Dear all How can i control the scattering boundary condition in 2D phononic crystal composed of array of water cylinder in steel matrix ?? thanks
View ArticleFrequency dependent pressure waves
Hi, I am trying to apply pressure waves to a mass contained in a closed volume in order to make it vibrate. So far I got it to vibrate, but I can't seem to find a way to set the frequency of the waves....
View ArticleIncident pressure field, can't set frequency?
Hi all, I am trying to apply pressure waves to a mass contained in a closed volume in order to make it vibrate. So far I got it to vibrate, but I can't seem to find a way to set the frequency of the...
View ArticleFriction-induced noise
hi everyone im working on friction-induced noise in a pin-on disk system. i have two problems. first on is that when i change pin's surface same as disk surface ( same shape in contact) i cant mesh the...
View Articlephononic crystal
hi .. can any one know how can i affect on a structure like phononic crystal by a magnetic field ??
View ArticleRotary woofer simulation
Hello. I am trying to simulate this recently developed rotary woofer:www.rotarywoofer.com/www.jpark.us/pubs/JASA_125(4)_RotaryWoofer_2009.pdf My main goals are to find out air flux and energy flux...
View ArticleAcceleration on Cantilever
Would you guys please suggest me how can I apply Acceleration on PZT Cantilever? I want to calculate Output voltage
View Articlewhy not the the far field calculation does not work in Frequency-Domain,...
Hi, I simulate the transducer performance under pre-stressed, and I reference the template"tonpilz transducer prestress" in the library. Far field pressure works under frequency domain, but I can not...
View Articleperfect absorbtion no reflection of sound waves
Hello folks! im building a module using 2D pressure acoustic frequency domain. I've got stock at how to create a BOUNDARY which DO absorb the incident waves and DOES NOT reflect them. the boundary is...
View ArticleProblems with 'Impedance boundary' and 'Cylindrical Wave Radiation'?
Hi, when I simulate radiation of sound waves with 'Pressure Acoustics, Transient', i meet some problems with the settings of boundary. I build a small circle as the sound source in a large circular...
View ArticlePoroacoustics in time domain
Hi, under pressure acoustics (freq domain) there is poroacoustics available, but i need it in the time domain for calculating frequency dependent RT60 decays. Background: getting the absorption within...
View ArticleTransfer Matrix in an acoustic problem in a Catalytic Converter
Hi, I'm trying to calculate the Transmission Loss in a Catalytic Converter. I apply an initial value of pressure of 1 Pa and I'm trying to replace the monolith by a transfer matrix. The model I use is...
View ArticleThe relationship between 'acpr.p_r' and 'acpr.absp'
I thought that 'acpr.absp' was the absolute value of 'acpr.p_r'，but I find it is wrong from the pictures in the case “piezoacoustic_transducer”. So that I am confused. Please help me explain what is...
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