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Understanding Shock & Vibration by Dr. Alec Feinberg Cost $350 per person  3.5 hours

This course provides excel based software to aid the student in quickly learning shock and vibration fundamentals. With the DfRSoft Shock and Vibration Software, the student will be able to specify shock tests and perform a number of analyses. The course will start with the basics, defining such terms as “G”, “g”, “Grms”, and “G-Force”. We will explain the physics of shock and vibration in understandable terms. At the end of this course the student will be able to clearly understand shock and vibration, its terms, how tests are specified, and have the capability to apply software as a test aid. Every section described below will have many examples to aid the student.

Shock Test and Analysis

The course will overview the different types of mechanical shock and test methods, including drop shock and electrodynamic shock pulse and Shock Response Spectrum (SRS) testing (and how these tests are specified). The software will help the user specify drop height, Gs, pulse durations and the need to calibrate the equipment.

Constant Acceleration

We will overview constant acceleration physics and testing. The student will understand the basics terms (RPN, Gs, and equipment radius) and how to specify this test and what key elements are needed to perform a successful constant acceleration test.

Sine Vibration

Sine vibration fundamental and physics will be explained in understandable terms, including natural and forcing frequency, damping, Q, and resonances. The student will be able to use the software to understand vibration testing and the interrelationships between sine amplitude, frequency, velocity and acceleration. We will discuss circuit board and equipment sine search resonance track and dwell testing, definition of an octave, sweep rate, graphical sine estimation of Q from the data and how to estimate if the resonance is too large and requires damping. The software will help the student understand the proper octave sweep rate for resonance searching and key locations to place an accelerometer. We will introduce S-N fatigue curves and the use of Minor’s rule. A discussion on time compression will follow for the vibration acceleration model and how to use it for fatigue life testing.

Random Vibration

Here we will introduce why we do random vibration, how to understand the frequency domain and the test specification, including common tests that are specified. The student will be able to estimate from the G2/Hz Power Spectral Density (PSD), the G-level content for both simple and complex spectra.  An overview of basic random as well as sine on random, random on random, tri-axial and angular vibration testing will be discussed. We will explain how to use random vibration to estimate Qs observed in the PSD spectra. We will discuss the time compression for the random acceleration model and how to use it for fatigue life testing. Repetitive shock will be overviewed which is used in HALT testing and how this spectrum differs from random vibration. What are the strengths and weakness of repetitive shock? When to use HALT versus electrodynamic (ED) random vibration testing? An introduction to HALT testing will be provided. Finally we will discuss how it is possible to do a HALT like test on an ED shaker. This will help the student understand some of the differences between HALT and ED test capabilities.

Required Tool from software module requires Excel 2003 or higher.  This will be supplied for free.


Dr. Feinberg has a Ph.D. in Physics and is the author of the book, Design for Reliability.  Alec has provided reliability engineering services in all areas of reliability and on numerous products in diverse industries that include solar, thin film power electronics, defense, microelectronics, aerospace, wireless electronics, and automotive electrical systems.  He has provided training classes in Design for Reliability, Shock and Vibration, HALT, Reliability Growth, Electrostatic Discharge, Dielectric Breakdown, DFMEA and Thermodynamic Reliability Engineering.  Alec has presented numerous technical papers and won the 2003 RAMS Alan O. Plait best tutorial award for the topic, Thermodynamic Reliability Engineering.

To purchase this webinar contact with link above or call 303 655 3051.