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

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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

Webinar 44 – Sine Filtering

Slides: webinar_44_sine_filtering.pptx

Audio/Visual:

NESC Academy Sine Filtering – Recommend viewing in Firefox with Sliverlight Plugin

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Matlab script: Vibrationdata Signal Analysis Package

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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@irvinemail.org

Webinar 43 – Two-degree-of-freedom System, Two-stage Isolation

Slides: webinar_43_two_dof_systems.pptx

Audio/Visual File:

NESC Academy Two-stage Isolation – Recommend viewing in Firefox with Sliverlight Plugin

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Matlab script: Vibrationdata Signal Analysis Package

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Reference Paper:  two_stage_isolation.pdf

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See also:  Two-degree-of-freedom Systems

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– Tom Irvine

Webinar 42 – Shock Special Topics

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

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Matlab script: Vibrationdata Signal Analysis Package

Data Sample: shaker_halfsine.txt – time (sec) & accel (G)
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Reference Papers

Simple Drop Shock
Integrating an Acceleration Half-Sine Pulse

An Alternative Method Of Specifying Shock Test Criteria:
NASA/TM-2008-215253 & PowerPoint slide overview

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Thank you,
Tom Irvine

Webinar 41 – PSD Special Topics

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

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Matlab script: Vibrationdata Signal Analysis Package

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Here is a brief guideline paper from Martin-Marietta:  bandsplit.pdf

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Thank you,
Tom Irvine

Webinar 40 Shock Fatigue

Shock Fatigue

1. Determine whether a given PSD can cover an SRS Specification

2. Derive an Optimized PSD which will cover an SRS

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Aerospace Pyrotechnic-type SRS tests are almost always more difficult to configure and control in the test lab and are thus more expensive than shaker table PSD tests.

Some lower and even mid-level SRS specifications may not have the true damage potential to justify shock testing.

The purpose of this webinar is to demonstrate a shock and vibration comparison method based on the fatigue damage spectrum (FDS).

The comparison results can be used with other considerations to determine whether the random vibration test covers the shock requirement.

A related method is also demonstrated for deriving an optimized PSD to envelop an SRS.

These methods are found to be effective comparison and derivation tools within a framework of assumptions.

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PowerPoint Slides:  webinar_40_shock_fatigue.pptx

Audio/Visual Slides:

NESC Academy Shock Fatigue – Recommend viewing in Firefox with Sliverlight Plugin

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Matlab script: Vibrationdata Signal Analysis Package

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See also:

Using Random Vibration Testing to Cover Shock Requirements

Fatigue Damage Spectrum

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VAL 2015 Conference Slides:  VAL_2015_Irvine_shock_fatigue.pptx

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Thank you,
Tom Irvine

Webinar 38 – Electronic Circuit Board Fatigue Part 2

PowerPoint Slides: Webinar_38_circuit_board_fatigue_part_2.ppt

Audio/Visual File:

NESC Academy Electronic Circuit Board Fatigue Part II – Recommend viewing in Firefox with Sliverlight Plugin

Reference Paper:

Extending Steinberg’s Fatigue Analysis of Electronics Equipment Methodology to a Full Relative Displacement vs. Cycles Curve

electronic_rd_n.pdf

extending_Steinberg.pptx

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Matlab script: Vibrationdata Signal Analysis Package

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See also:

Webinar 32 – Circuit Board Fatigue

Thank you,

Tom Irvine

Webinar 37 – Acoustic Fatigue

PowerPoint Slides:  webinar_37_acoustic_fatigue.pptx

Audio/Visual File:

NESC Academy Acoustic Fatigue – Recommend viewing in Firefox with Sliverlight Plugin

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References:

Rainflow Fatigue Posts

Acoustic Fatigue of a Plate

Acoustic Power Spectra

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Matlab script: Vibrationdata Signal Analysis Package

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See also: Vibrationdata Webinars

Thank you,

Tom Irvine

Webinar 36 – Non-Gaussian Random Fatigue and Peak Response

PowerPoint Slides: webinar_36_fatigue_nonGaussian_random.pptx

Audio/Visual File

NESC Academy Non-Gaussian Random Fatigue and Peak Response – Recommend viewing in Firefox with Sliverlight Plugin

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References:

Rainflow Fatigue Posts

Generating Random Time Histories with User-specified Skewness & Kurtosis

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Matlab script: Vibrationdata Signal Analysis Package

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See also: Vibrationdata Webinars

Thank you,

Tom Irvine

Webinar 32 – Electronic Circuit Board Fatigue

PowerPoint Slides:  Webinar_32_circuit_board_fatigue.ppt

Audio/Visual File:

NESC Academy Electronic Circuit Board Fatigue Part I – Recommend viewing in Firefox with Sliverlight Plugin

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References:

Steinberg’s Vibration Analysis for Electronic Equipment

Extending Steinberg’s Fatigue Method

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Matlab script: Vibrationdata Signal Analysis Package

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See also: Vibrationdata Webinars

Thank you,

Tom Irvine