Random Vibration, Shock Testing, HALT, ESS, HASS Measurements, Analysis and Calibration

What you will learn:

Upon completion of this short course, you will be able to measure vibration and shock, calibrate vibration and shock measurement systems, convert measured data into a test program, interpret vibration and shock test requirements, conduct vibration and shock tests, design suitable vibration and shock test fixtures.

Abstract:

Lectures, supported by projected visuals and video clips, commencing with a review of basic vibrations, then vibration measurements, analysis and calibration; sinusoidal and random vibration testing; ESS; HASS and HALT; vibration and shock test fixture design; shock measurement, shock response spectrum (SRS) and shock testing. Review of modal testing.

Who should attend:

You should attend if you if the following describes you. Perhaps you were thrust into this responsibility without adequate training. Maybe your predecessor had no opportunity to alert you to potential difficulties. You certainly need to know what your people are talking about. Possibly you had no formal training for your present responsibilities. You need to explain your department's activities to your superiors in the technically correct language. Perhaps you need to decide between "in house" and "outside" testing. Perhaps you need practical knowledge about mechanical vibration and mechanical shock test, measurement, analysis, designing for dynamics also calibration.

Detail:

The details of the course are covered below in the Outline section.

Course Outline

Introduction for management and participants

Purpose of environmental testing, particularly vibration and shock
Purpose of environmental stress screening (ESS)
Types of vibration tests: resonance search/dwell, fatigue, specification
Approximate scheduling so managers can audit special topics

Quiz for evaluation of attendee prior knowledge

Classical sinusoidal vibration never observed in service; useful concept

Introduction: terminology, structural resonant behavior, passive and active isolation
Sinusoidal vibration measurements: units, sensors, readouts, errors
Calibration of sensors and systems; traceability to NIST

Most machinery vibration is complex; introduction to
spectrum analysis

Sinusoidal vibration testing

Electrohydraulic and electrodynamic shakers; theory, tradeoffs, limits
Power amplifier theory, operation, limitations, distortion effects
Controls for sinusoidal vibration testing
Sinusoidal vibration test practice
- Interpretation of standards; e.g. MIL-STD-810
- Controversial test methodology: tracking filters, switching and averaging among sensors

Introduction to random vibration

Sources of random vibration in service and transportation
No possible equivalence to sinusoidal vibration
Terminology and definitions
Spectral density measurement and analysis - the frequency domain. What is g²/Hz?
Probability density - the time domain

Random vibration test practice

Interpreting and implementing standards, e.g. MIL-STD-810
Equalization before testing; methods and limits
Controls
Electronic protection for test items and shaker system

Combined environment (CERT) testing; reliability tests, e.g. MIL-STD-781

Environmental stress screening (ESS) of electronics hardware production

Single vs. multi-axis vibration
Pneumatic repetitive-shock machines

Highly accelerated life testing (HALT), environmental stress screening (ESS) and highly accelerated stress screening (HASS) of electronics hardware production.

Single vs. multi-axis vibration.
Pneumatic repetitive-shock (RS) machines.
Acoustic excitation of printed wiring boards (PWB).

Vibration and shock test fixtures; fixtures for stress screening

Recommended designs, materials, fabrication methods
Experimental evaluation before use
Practical limits: transverse motion; specimen size and weight

Accomodating oversized loads

Table expanders
Slip plates and alternatives

Instrumentation for measuring shock in service and during tests

Sensors, readouts, errors
Calibration

Shock spectrum analysis; shock response spectrum

Shock testing standards and methods

Modal testing

Witnessing of tests

Course summary; optional final examination; award of certificates

Instructor: Wayne Tustin

Wayne's first involvement in vibration and shock, measurement and testing was at Boeing/Seattle in 1948. Boeing was not only measuring in-flight vibrations but also pioneering (on the XB47 and XB52 bombers) the use of (homemade) electrodynamic shakers for what much later came to be known as modal testing. Wayne used that practical experience while associated with a pioneer shaker system manufacturer (MB Electronics, later reorganized as MB Dynamics) 1954-61. From 1962-90 he directed a small, specialized engineering school. Since 1990, he has provided consulting services. Resuming teaching in 1995, he specialized technical education, mainly onsite, at the facilities of companies and agencies, for test personnel and designers. He currently teaches a short course "Automotive Vibration and BSR (Buzz, Squeak and Rattle) Testing," several times per year, for the Society of Automotive Engineers (SAE). Also a few "open" courses and individualized "distance learning" for individuals, via CD-ROM and e-mail

Availability:
Format	Date	Length	Location	Price
Course Notes				RFQ
Onsite		3 days		RFQ
Public	2-23-10	3 days	Santa Barbara, California	$2,595.00 REGISTER NOW RFQ
Public	4-20-10	3 days	Chatsworth, CA	$2,595.00 REGISTER NOW RFQ