Uncategorized - Vibrationdata Engineering Blog

Fluid Slosh in a Basin or Tank

June 30, 2015 by admin

Sloshing can occur in swimming pools, trucks carrying liquids, rocket vehicle propellant tanks and in other situations. Sloshing of propellants may adversely affect the stability of a space vehicle and the integrity of the tank structure. Sloshing describes the free-surface oscillations of fluid in a… Read more

Cubic Spline Curve-fit

June 17, 2015 by admin

In some cases, the sampling rate of measured data needs to be increased, particularly for time domain analysis. One method is do a cubic spline curve-fit. This is an “engineering judgment” process with some limitations. The “Input Data” in the figure above is a 12… Read more

Circuit Board Shock & Vibration Analysis

June 10, 2015 by admin

Here is series of course units that I have developed for circuit board analysis: Circuit_Board_Slides (The zip file can be downloaded using the icon with the downward pointing arrow.) The corresponding Matlab software allows for the creation of finite element models for rectangular boards. The… Read more

Digitizing Plots

April 22, 2015 by admin

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

Webinar 48 – Rainflow Cycle Counting for Multiaxial Stress

March 10, 2015 by admin

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

Book of Mormon, Hebrew

April 1, 2026March 10, 2015 by Tom Irvine

The Book of Mormon, Hebrew & English Another Testament of Jesus the Messiah, Son of David, Son of God ___________________________________ For Zion’s sake will I not hold my peace, and for Jerusalem’s sake I will not rest, until the righteousness thereof go forth as brightness, and the… Read more

Webinar 46 Two-degree-of-freedom System with Multi-point Enforced Motion

February 19, 2015 by admin

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 .

Fixed-Fixed-Fixed-Fixed Plate, Fundamental Vibration Mode

February 13, 2015 by admin

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

February 13, 2015 by admin

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

Semi-Truck with Triple Trailer Swaying Oscillation

October 31, 2014 by admin

Some U.S. states allow semi-trucks with three trailers. The truck configuration can total up to 105 feet by adding a rear trailer. Terry Sumter, a UPS driver for 30 years, has experienced the back trailer moving into the oncoming lane. “The most significant condition is… Read more