Spherical shell (submerged) - what is the best model for acoustic resonance frequency and sound scattering?

25 May 2021 1 5K Report

The shell is made of metal, the inside and exterior are inviscid fluids.

The ratio of shell thickness to radius (h/a) ranges from 0.5 % to 2 %.

I have written Fortran programs for the models described in the papers listed below but they are all unsatisfactory in some respect. Hickling used full exact elasticity, but there seem to be misprints in the paper. The others are thin-shell models and yield a resonance frequency of zero at particular values of h/a. I will give further details to anyone who asks and is acquainted with the issue.

Hickling 1964

Lou & Su 1978

Felippa & Geers 1980 (same result as preceding paper)

Dean & Werby 1992

Jonas Brunskog

Do you have measurements or a numerical model to compare with (validation/verification)? If not, then it is difficult to judge which is 'best', unless there are some clear errors or unrealistic assumptions in the different models.

Badges
Science topic

More Marshall Hall's questions See All

How would I go about getting an expert review on the interview questions for the dissertation?

Good Evening, My name is David Marshall and I am Doctor of Management Student at Colorado Technical University Online. I just recently received approval from the IRB to start data collection on...

08 February 2021 346 7 View

Can zinc based fixatives be used after enzymatic dissociation of neural tissue?

I am working on a FACS experiment with mouse neural tissue. I want to preserve all cell types as much as possible and the zinc fixation papers I have read use mechanical dissociation which can...

21 January 2021 4,430 1 View

Is there a technique to store fixed cells after flow for later RNA analysis?

I am separating neuron populations from mouse brains using FACS. I am trying to find a fixation technique for intracellular antigen staining and FACS that will allow long term storage afterwards...

21 January 2021 9,722 3 View

How do I extract mice brains for multiple experiments?

I am looking to complete western blot experiments and IHC experiments on the same cohort of mice. Is it possible to Harvest the mouse and use the right hemisphere for IHC and the left for western...

08 September 2020 5,436 3 View

Can anyone recommend a journal focused on "assessment & evaluation" in education that looks favourably on qualitative research?

Looking for a place to submit an article related to assessment and evaluation in physical education that was rejected clearly due to being qualitative in nature.

06 February 2020 3,229 2 View

How do I interprete the results of a moderation analysis with a categorical and a continuous variable?

Hi all, I have a question concerning a moderation analysis within an experimental setting. The independent variable is categorical and has two options. The moderator is a continuous variable. I...

06 January 2020 9,511 1 View

Can I examine chemokines using a western blot from total endothelial cell lysate?

After qPCR analysis of HUVEC lysate from my experiment, I found upregulation of several chemokine mRNA that I would like to validate via western blot. Due to the nature of my experiment, it would...

15 December 2019 5,297 3 View

Failure to detect protein by Western blotting: No expression or antobody does not work?

Dear Colleagues I have a colleague who is not expecting an antibody in her lysate to give expression of a protein at about 23kD (owing to gene methylation) However, the antibody does give bands...

11 December 2019 3,571 3 View

How to interpret Western blot with one specific band and one apparent non specific band?

Dear Colleague(s) this is really an extension of my previous question relating to Western blotting on Behalf of the same colleague How valid would you consider a Western blot that does indeed...

11 December 2019 8,605 4 View

Test for silicone residue from silicone part?

I have a silicone part that will come in contact with food. It will need to pass FDA tests for hexane extraction of silicone residues. Is there a method I can use to remove uncured material and...

09 December 2019 4,246 3 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

Why the results when using wall thickness and when using shell conduction are different in ansys fluent?

Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used...

01 March 2021 9,537 2 View

How can I make stacked bar graph with scatter plot?

I want to make a stacked bar graph with showing each data value as dots. I tried with graph pad prism, version 6, but could not succeed. Does anyone have tried before making such graphs?

01 March 2021 9,383 1 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Can we use a compensation matrix with single staining that the negative population for each single staining is below zero?

Recently we used single staining to make a compensation matrix. But, for each single staining we saw that 13 to 25 percent of our negative population had been shown below Zero. In this situation...

21 February 2021 9,982 2 View

How to compare means of continuous data with zero-inflation and skew?

I have two groups (unpaired) of plant biomass measurements and want to know whether there is a test that can be used to determine statistical significance where assumptions are not violated. The...

18 February 2021 1,258 4 View

Absorption behaviour of anechoic model?

I have modelled a unit-cell of an anechoic structure using ANSYS. The layer is silicone and has been assigned as an acoustics physics region, with an air cavity inside (the air has been modelled...

18 February 2021 4,119 1 View

Can anyone name this graph type?

I've attached a recreation of this graph type that I need to make for study reports. The clients have sent them to us in the past, but I am trying to make the reporting process more streamlined,...

15 February 2021 9,795 3 View