Dynamic Modelling of Structures Using Finite Elements Report Writing Engineering Assignment Help

Assignment Task

Configuration of a model structural system
Model the structure in MATLAB using the required number of finite elements.
Figure 1 shows schematically of the structural system built in the laboratory. Note that the two structures
in the lab are deliberately different (different rectangular hollow section geometry) – you need to be clear
which system you are working on when you model the system. Eight equally spaced lumped masses are
rigidly attached to a rectangular hollow section column 2 m in height. The column is rigidly fixed to the
ground. The lateral vibration of the model structure is of interest

Project 2 Part 2: Experimental analysis and report 
In the laboratory session the first five natural frequencies at least were extracted from experimental data
obtained during a roving modal impact hammer measurement campaign. The Frequency Response
Functions (FRFs) were collected and saved for each of the eight storeys. The approximate mode shapes of
each of the eight natural frequencies can be determined by extracting the peak values from the Imaginary
part of the FRF for each natural frequency and plotting these against the position of the storey from which
the peak value was obtained. This is a technique known as “Quadrature Peak Picking”. At least the first
five of these mode shapes, and their corresponding natural frequencies, should be reported.
Additionally, a precise mode shape for the second natural frequency was extracted using a shaker excited
roving accelerometer measurement campaign. This mode shape can be compared and contrasted with
the equivalent obtained through quadrature peak picking. All of the above experimentally determined
results are to be compared with those theoretically determined in Part 1 for the first five natural
frequencies and the collected mode shape.

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