Mechanical Shock Techniques

Start Date: 22 Dec 2019
End Date: 26 Dec 2019
Duration: 5
Country: Cairo / Egypt
Category: Engineering and Technical Programs

Course Description

The effects of shock are important in many engineering applications ranging from appliances to computers to ships to automobiles, trucks and military vehicles to high-performance aircraft and missiles. Shock is often part of the service and/or transportation environment.

The possible effect of shock must be considered for almost every product that has to be shipped and handled. Care can be taken in a controlled environment but during the transportation phase the product within its package must be designed and tested to withstand the anticipated environment.


Course Objective

The course commences with a review of basic dynamic theory and then covers natural frequencies and modes before discussion system response to shock. The Shock Response Spectrum (SRS) is discussed as it relates to shock measurement and testing, as well as design. The relative merits of various types of shakers and shock test machines are briefly considered before covering various shock test methods, including pyrotechnic shock testing. The course then covers shock measurements, also calibration. Shock resistant design is discussed, including the selection and use of isolators.



Who Should attend?

Most engineers need specialized education in order to properly measure, quantize and analyze this generally unfamiliar environment, and to reproduce it in environmental test laboratories. This course is for packaging designers, test laboratory managers, engineers and aides. It also helps quality and reliability specialists and acquisition personnel in government and military activities , and their contractors.

Instrumentation specialists who will measure transportation, service and laboratory shock need this course. Metrologists learn about shock calibration of accelerometers and systems. Project personnel, structure and packaging engineers learn about developmental shock testing. Product assurance and acquisition specialists learn to evaluate shock test facilities and methods, and to interpret shock test specifications.

This course is designed to serve the varied needs of scientists, engineers, aides and senior technicians.

Course Outline


Introduction ó What is Shock?

         Review of Dynamics and Theory of Materials

         Basic concepts

1.     Weight

2.     Mass

3.     Density

4.     Specific gravity

         Definitions of terms

         Friction, wear

         Work, power, energy

         Engineering materials

         Stress and Strain





         Spring-Mass Model

         Degrees of Freedom


Vibration Theory

         Degrees of Freedom

         Natural frequency (resonance)

         Displacement, Velocity and Acceleration



         Critical Frequencies

         Random Vibration

         Gaussian Random Signal

         Spectral Density


System Response to Shock

         Natural Frequencies

         SDoF Transient Response

         The Transient Response Problem

         Free, Forced Response


A Closer Look at Shock


         Input Pulse and Response of a Sprung Mass

         Typical Complex Shock Pulses

         Haversine Pulse

         Classical Shock Pulse Shapes


         Critical Frequency Response

         Response to Shock Pulse


Shock Response Spectrum (SRS)

         Shock Measurement


         SRS Mechanical analogy

         How SRS is developed during shock testing

         Maximize values

         Maximum Response Spectra for Various Shock Pulse Shapes

         Damping and SRS

         Damped Spectra

         Designing with SRS

         SRS in shock test specifications

         Shock spectrum analyzers


Shock Testing: Shock Test Machines

         Drop test machines

         Impact machines

         MIPS tables

         Electrodynamic, Electrohydraulic and Piezoelectric shakers

         Shaker Optimized Cosine (SHOC)

         Pyroshock simulation

         Problem Areas

         Pendulum and Free-fall machines


Shock Measurements

         Sensors for Force, Displacement, Velocity, Acceleration

         Seismic transducers

         Dynamic calibration of motion sensors

         Sensor attachment


         Accelerometer loading effects


Designing for Shock

         Shock Resistant Design

         Isolation Methods

         Isolators which approach the ideal

         Shock isolation vs. Vibration Isolation

         Isolator selection


Package/Product Fragility AnalysisóTheory and Practice

         Determination of fragility

         Methods and equipment


Protective Packaging

         Potentially Harmful Environments

         Package design tradeoffs

         Design drop heights

         Product Fragility

         Damage boundary theory

         Step velocity and step acceleration

         Cushion materials

         Cushion performance curves

         Vibration in package testing

         Frequency response

         Multiple Drop Testing

         Package verification test procedures


Fragility Assessment Theory and Test Procedure

         Typical Shock Test Specifications

         MIL-STD-810E, Method 516.4 Shock

         Typical Free Fall Shock Test Specification

         Table-Top Drop Shock Test

         Drop Shock and Vibration Test Specification for Disk Drives

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