Here is audio/visual file: Digitizing Plots Here are slides, Matlab scripts and data samples: Unit_33_PP.zip Here is another script: digitize_plots.m This is vintage presentation. I need to add the Matlab scripts to the Vibrationdata GUI package. – Tom Irvine
Notes on Fatigue for Pure Compression Stress
Fatigue is usually associated with tensile stresses. Engineering knowledge of compressive fatigue is very limited. Compression stresses do not cause cracks, but plastic compressive strain can cause tension stresses when the load is returned to zero and the resulting tension stress causes cracks. * *… Read more
Webinar 48 – Rainflow Cycle Counting for Multiaxial Stress
Slides: To be added before 4/4/2015 This unit gives a method for converting a time-varying stress tensor into a weighted-average equivalent uniaxial stress. The weights are chosen to maximize the fatigue damage. * * * Matlab script: Vibrationdata Signal Analysis Package * * * Reference… Read more
Webinar 47 – Shock Response Spectrum Synthesis, Special Topics
Slides & Video: webinar_47_SRS_synthesis_special_topics.pptx A high-range Cummins Generator in a Seismic Shaker Test.mp4 Topics: 1. Shaker Table Seismic Testing of Equipment using Historical Strong Motion Data Scaled to Satisfy a Shock Response Spectrum 2. Temporal Moments * * * Matlab script: Vibrationdata Signal Analysis Package… Read more
Webinar 46 Two-degree-of-freedom System with Multi-point Enforced Motion
Slides: webinar_46_two_dof_multipoint.pptx * * * Matlab script: Vibrationdata Signal Analysis Package * * * Reference Paper: two_dof_enforced_motion_multipoint.pdf * * * See also: Two-degree-of-freedom Systems * * * – Tom Irvine .
Temporal Moments
Temporal moments are sometimes used for shock analysis. Here is a Matlab script: temporal_moments.m References: Hemez & Doebling, From SRS to Temporal Moments J. Cap & D. Smallwood, A methodology for defining shock tests based on shock response spectra and temporal moments See also: Energy… Read more
Fixed-Fixed-Fixed-Fixed Plate, Fundamental Vibration Mode
The plate is aluminum, 0.063 inch thick. The fixed edge lengths are 6 and 4 inches. The vibration mode was calculated via the Rayleigh method using an assumed displacement function, as carried out via Matlab script: fixed_fixed_fixed_fixed_plate.zip The method is given in: fixed_fixed_fixed_fixed_plate.pdf See also:… Read more
Webinar 45 – Two-degree-of-freedom System with Rotation and Translation
Slides: webinar_45_two_dof_trans_rot.pptx Audio/Visual File: NESC Academy Two-degree-of-freedom System with Rotation and Translation – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Reference Papers Sample Automobile Vibration Problem: auto.pdf Spring-Mass System Subjected to Enforced Motion:… Read more
NASGRO Coefficients
The following scripts calculate the A, B, C, P coefficients to model a set of SN curves with varying R values: sin_curve_fit_R.zip sn_curve_fit_R.m is the main script. The remaining scripts are supporting functions. The equations are given in: sn_curvefit_equation.pdf * * * References: 1. MIL-HDBK-5J… Read more
Webinar 44 – Sine Filtering
Slides: webinar_44_sine_filtering.pptx Audio/Visual: NESC Academy Sine Filtering – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Please send me an Email if you would like to be on the distribution list for the webinar… Read more