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  • Users: Hoomanya
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  1. Hoomanya

    single DoF in comparison with a bar

    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.
  2. Hoomanya

    making sense of flow induced vibration results

    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...
  3. Hoomanya

    modelling of a piston

    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...
  4. Hoomanya

    Simulation of wave propagation in 1D elastic bar

    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...
  5. Hoomanya

    longitudinal vibration of continuous system (1D bar)

    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...
  6. Hoomanya

    Shear Stress in a tensile test

    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...
  7. Hoomanya

    unsteady flow -- for loops - matlab

    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...

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