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Transfer & Impulse Response Functions Page

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TUTORIALS - Applied Force
An Introduction to Frequency Response Functions:  frf.pdf
The Impulse Response Function: impulse_response_function.pdf
Response of a Single-degree-of-freedom System Subjected to an Impulse Force: force_impulse.pdf

Transfer Function from Modes
transfer_from_modes.pdf

Nyquist and Nichols Plots: Nyquist_plot.pdf
Structural Dynamics Testing using an Impulse Force:  structd.pdf
This tutorial also covers use of the exponential window.

The Fundamentals of Modal Testing: modal_fund.pdf

Richardson, Derivation of Mass, Stiffness and Damping Parameters From Experimental Modal Data: derivation_modal.pdf

Okuma, Heylen, Sas, Identification of Rigid Body Properties of 3-D Frame Structure by MCK Identification Method:  ident_MCK.pdf

TUTORIALS - Base Excitation

The Impulse Response Function for Base Excitation:  impulse_response_function_base.pdf

The Steady-State FrequencyResponse Function of a Multi-degree-of-freedom System Subjected to Harmonic Base Excitation: mdof_FRF_base.pdf
Effective Modal Mass & Modal Participation Factors: ModalMass.pdf
 Bruel & Kjaer Booklets
Structural Testing 1: Mobility Measurement
Structural Testing 2: Modal Testing

Matlab Script
Calculate frequency & impulse response functions from an input force and response amplitude time history.
 frf_from_th.m

Supporting Functions:

fix_size.m
 progressbar.m 

frf_median_filter.m

Transfer Function from Modes
transfer_from_modes.m
Supporting Functions:

fix_size.m
Generalized_Eigen.m
transfer_core.m
find_max.m
transfer_from_modes_plots.m
transfer_from_modes_H_files.m
enter_modal_damping.m
progressbar.m
Power Transmissibility Function from Modes
powertrans_from_modes.m
Supporting Functions:
transfer_core.m
enter_modal_damping.m
Generalized_Eigen.m
This program calculates a transfer function for two selected degrees-of-freedom in a system based on the mode shapes, natural frequencies, and damping ratios. It also calculates the applied force for a single given displacement, velocity, or acceleration. transfer_find_force.m
This program calculates a response time history from
an input time history and a transfer function where
the transfer function is a complex Fourier transform.



 blast.m

Supporting Functions:

progressbar.m

enter_time_history.m
enter_H_complex.m
inverse_fourier_transform.m
linear_interpolation.m
The Steady-State Frequency Response Function of a Single-degree-of-freedom System Subjected to Base Excitation
 sdof_base_frf.m
find_max.m
The Steady-State Frequency Response Function of a Single-degree-of-freedom System Subjected to Harmonic Force Excitation
 sdof_force_frf.m
find_max.m

 Software Description

 Executable

  Source

Transfer functions for an applied force from natural frequencies, modal damping and normalized eigenvectors
transfer_modes.exe

transfer_function.exe
transfer_modes.cpp

transfer_function.cpp
Transfer functions for an applied force from natural frequencies, modal damping and normalized eigenvectors with option for omitting rigid-body modes
transfer_function_rb.exetransfer_function_rb.cpp
Relative displacement transfer function for an applied force
transfer_relative_displacement.exe
transfer_relative_displacement.cpp
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