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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.

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Matlab script: Vibrationdata Signal Analysis Package

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Reference Paper:  Tools for Multiaxial Fatigue

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– Tom Irvine

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

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Matlab script: Vibrationdata Signal Analysis Package

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Reference Papers:  

quake_syn.pdf

From SRS to Temporal Moments

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– Tom Irvine

Slides:  webinar_46_two_dof_multipoint.pptx

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Matlab script: Vibrationdata Signal Analysis Package

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Reference Paper:  two_dof_enforced_motion_multipoint.pdf

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– Tom Irvine

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Temporal Moments

Temporal moments are sometimes used for shock analysis.

Here is a Matlab script: temporal_moments.m

Here is a paper: From SRS to Temporal Moments

More later…

– Tom Irvine

fixed_fixed_fixed_fixed_plate

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: Vibrationdata Rectangular Plates

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See also:

Natural Frequencies of a Flat, Rectangular Plate, Finite Element Method

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– Tom Irvine

Slides: webinar_45_two_dof_trans_rot.pptx

Audio/Visual File:
Two-degree-of-freedom_System_with_translation_and_Rotation.wmv

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Matlab script: Vibrationdata Signal Analysis Package

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Reference Papers

Sample Automobile Vibration Problem: auto.pdf

Spring-Mass System Subjected to Enforced Motion: two_dof_enforced_motion.pdf

See also: Dynamic Response to Enforced Motion

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Please send me an Email if you would like to be on the distribution list for the webinar login information.

Tom Irvine
Email: tom@vibrationdata.com

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

sin_curve_fit_R.m is the main script.

The remaining scripts are supporting functions.

The equations are given in: sn_curvefit_equation.pdf

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References:

1. MIL-HDBK-5J

2. NASGRO NASFORM manual

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– Tom Irvine

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