Dear all,
I am using Matlab Toolbox MACEC 3.3 for EMA of a railway sleeper (both concrete and timber).
The resulting mode shapes I obtain are unity scaled modal mass mode shapes and they appear as complex numbers. For each mode calculated I also have information about Modal phase...
I have some strange readings from an impact hammer and acceleromeeters. The hammer is from Piezotronics PCB Model 086D50 and the accelerometers are from Dytran model 3333A and 325M24.
On the first picture called Force you can see the plotted force magnitude in Newtons with number of samples. I...
I have done an impact test on a railway sleeper which was embedded into railway ballast.
I did impacts at 11 points along the sleeper, and I have gathered acceleration for each of the impacts at 11 points of the sleeper, i.e. I had 11 impact/reference points and 11 response points...
Dear all,
I have tested a concrete beam that is embedded into layer of gravel (100 mm thick). I have looked only at vertical direction. The accelerometers are positioned on top of the beam and the impact was applied as close as possible to the positioned accelerometers. In total I have used 10...
Dear all,
I have acquired some data by using instrumented hammer and 8 accelerometers.
The data has been acquired on a railway track on a timber sleeper.
Now, I want to analyse the data in the frequency domain.
Usually I am interested in the lower frequency range up to 1000Hz.
When I...
Hi!
When we define modal strain energy, is it done separately for translational and rotational modal displacements?
I am looking on a paper where they use Modal Strain Energy Criterion in FEM crack detection in beams. They use an expression like: MSEij=1/2*PhiTij*Ki*Phiij, where:
PhiTij refers...
Hi!
Did anyone had experience with training courses in Abaqus? What is the approximate price per training? I am just starting with Abaqus, so I need a good introduction.
I contacted Dassault Systèmes by email for this, but still didn't received any reply. If someone could share experience would...
Hi,
I am looking at natural frequencies and mode shapes of Timoshenko beam in Matlab. For the analysis I used FEM. I had translation and rotation at each node, 4DOF per element.
I need to calculate MODAL NODAL FORCES, expressions: ke * phi and K * PHI.
ke * phi refers to element level and K...
Hi everybody,
Can anyone comment my work, since I'm new in this are? I'm trying to perform SIMO analysis in MAtlab.
I have done an analysis of Euler-Bernouli beam subjected to square force in the middle of the beam in Matlab. Using Wilson's Theta numerical integration method I have calculated...
Does anybody know how to model impact force at certain location on the beam in MATLAB by using FEM?
I need to obtain dynamical response of Timoshenko beam in MATLAB when it’s subjected to impact force, e.g. square force shape in the middle of the beam. I’m using FEM and Wilson’s Theta method...
Hi! Can anyone advise me regards possible training in vibration testing in Europe. My work includes modal analysis in railway environment where I need to determine the changes in soil stiffness and also evaluate the stiffness quantitatively.I'm new in the field of modal testing so any...
