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
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
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
Slides: webinar_43_two_dof_systems.pptx & Alternate Link Audio/Visual File: NESC Academy Two-stage Isolation – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Reference Paper: two_stage_isolation.pdf & Alternate Link * * * See also: Two-degree-of-freedom Systems * * * -… Read more
1.Accidental Drop Shock 2.Half-Sine Shock on Drop Tower 3.Half-Sine Shock on Shaker Table 4.Waveform Reconstructions via Wavelets Slides: webinar_42_shock_topics.pptx Audio/Visual: NESC Academy Shock Special Topics – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package Data Sample: shaker_halfsine.txt -… Read more
1. Band-Splitting 2. Time-Level Equivalence 3. PSD Synthesis using Sine Series PowerPoint Slides: webinar_41_psd_topics.pptx Audio/Visual File: NESC Academy PSD Special Topics – Recommend viewing in Firefox with Sliverlight Plugin * * * Matlab script: Vibrationdata Signal Analysis Package * * * Here is a brief guideline… Read more
I am taking a class in continuum mechanics at the University of Alabama in Huntsville. Here are some notes: Derivation of the Epsilon-Delta Relationship: epsilon_delta.pdf Continuum Mechanics Formulas (Kronecker delta, permutation symbol, dot product, cross-product, etc.) : cm_formulas.pdf Del Operator Proofs (divergence, curl, cross-product, etc.):… Read more
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
Curiosity is a car-sized robotic rover exploring Gale Crater on Mars as part of NASA’s Mars Science Laboratory mission (MSL). Curiosity was launched from Cape Canaveral on November 26, 2011 aboard the MSL spacecraft and landed on Aeolis Palus in Gale Crater on Mars on… Read more
The following is based on a description from Dennis Kern, NASA/JPL, which Isam Yunis, NASA Langley, referenced in a shock presentation. Shocks travel through structure as a combination of propagating waves and vibration response, with the vibration response concentrated more in lower frequencies and the… Read more