Hi, if I replace a single degree of freedom forced mass spring system, with a fixed- forced bar, I know that my eigenfrequency increase, and so I would be seeing more frequencies, my question is what is expected of the amplitude of vibrations??? thanks.
I have a set of amplitude plots of flow induced vibrations and was wondering if anyone could help me understand a few points. I know that attenuation of amplitudes indicate numerical damping, and increase in the amplitude of vibrations is a sign of instability. But what if:
1) before any of...
Hi ,
To model a fluid chamber closed at one end, connected to a piston in 1D. I know that the piston can be modelled as a bar and I know the boundary conditions imposed as the boundary connected to the fluid. My question what the displacement (u) and velocity (v) and stress (sigma) are at the...
Hi,
I have been trying to model the 1D elastic bar problem outlined in the link below using Abaqus:
Link
1) I have never done Dynamic analysis apart from a few tutorial so I am slightly confused on whether I need to do an Explicit or Modal analysis, or else?
2) I have managed to get the...
Hi,
I have been looking at working out the natural frequency and mode shapes of a 1D bar. I have now understood the standard cases, for instance the fixed-free bar with BCs: u@(x=0) = 0; and du/dx@(x=L) = 0.
I need to tackle a case where the free end is replaced by du/dx@(x=L) = P(t), where...
Hi,
I was under the impression that in a simple tensile test there is no shear present but have now been told by my mentor that even in a simple tensile test shear is present. To understand this I was told to think of Mohr's circles and rotate the coordinate system by 45 degrees. I am...
Hi all,
I am writing a code for an unsteady flow in maltab. This code is over simplified just to realize where I am going wrong and understand the basic first...
n = number of time steps
h = number of cells
v1 = zeros(h,n+1); %v1(x,t)
v1(1,= 0; %boundary condition
for j = 1: n+1
for j = 1: h...
