Recent content by saurabhsuresh

FANTASTIC!....thanks so much..that really soved a lot of problems..coz i had a formula for bending waves speed and it was dependent on the freq and I was wondering if that was correct or not ..thanks again!

its a rectangular/square plate with very small thickness ....almost like a sheet

Is that what transverse waves are...the bending waves (pardon my ignorance) ....because i need two wave speeds, the longitudinal wave speed and the transverse wave speed. So are you saying that Bending wave speed and transverse wave speed are the same

Hi .... Can anyone tell me if there is an equation to find the transverse velocity of sound in a plate? Thanks! Saurabh

Hi, I needed help regarding where and how I could enter the acoustic impedance (density x speed) for a material in ANSYS. I know there is a tab under Appply loads>Fluids>impedance.....But if if I am not mistaken, the value to be entered there is between 0 and 1. So can anyone tell me if I have...

ok...i think i tried meshing it with more elemnts along the thickness and that did not seem to change the result, because ultimately it is still vibrating the panel and the nodes are still transmitting the pressure from one side to the other through flex modes of the plate

Thanks for the response Dr Platten....the critical frequency is around 3000Hz. So I was un der the impression that no matter what the size of the sample, the Transmission loss would remain the same and I would see a dip around that frequency. But my ANSYS model seems to be governed by the...

What you said about longitudinal waves makes a lot of sense..and yes a i realized that the sound being transmitted based on the vibration modes. When you say what meshing am I using..I don't quite understand what you mean. I mesh it regularly using quad mesh with one element along the thickness...

Thanks Greg.... Yea i know that would work, bu the thing is, I am tryin to simulate this condition in ANSYS....So if you would happen to know how I could go about that in ANSYS that would be really helpful!..Thanks again

Right..so all i want to do is check the noise reduction across the glass sample...say Im not considering a windscreen. Jst to know how the sample would react at different frequencies.... Would you know how to test it acoustically?

Yes that is exactly what I was thinking as well. But if I want to to the same test at higher frequencies (say 5000-8000Hz), the tube inlet size has to be reduced to accommodate this frequency which in turn reduces the sample size. But then the resonant frequency of the smaller sample reaches...

Hi Guys, Im trying to model a part of the windshield in an impedance tube to check the noise reduction across it. When I model it in ANSYS, the noise reduction seems to change with the area of cross section. But in reality, no matter what the area of cross section is, the noise reduction should...

Hi guys... I am trying to model a porous material in ANSYS 12 and it requires to inputs - BIOT CONSTANT and FLUID PERMEABILITY. Any idea on how I can calculate these two values for my material (PVB). This doesn't have these values readily available. So i will have to calculate it. Any help...

Hi Guys, I am trying to model a tube in ANSYS which has a sample sitting in the center. I basically want to measure the noise reduction across the sample inside the tube. I need some help and ideas in modeling it. Any Help will be appreciated

Hi Guys, I am trying to model a tube in ANSYS which has a sample sitting in the center. I basically want to measure the noise reduction across the sample inside the tube. I need some help and ideas in modeling it. Any Help will be appreciated