# Mechanical Design for Product Reliability Course No. 310

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```					        Mechanical Design for Product Reliability
Course No. 310
APPLICATIONS Random vibration and shock are important in                                     Course Outline
most engineering applications where the product is exposed to           Introduction to Vibration
vibration and shock during transport and service. An understand-        Dynamic Force and Motion
ing of vibration and shock is crucial to improving the reliability of      Laws of Motion, Weight vs. Mass • Gravity • Density
today’s products, wherever electronic components appear.                   Force, Mass and Acceleration • Degrees of Freedom
FOR WHOM INTENDED This course is for design engineers and                  Displacement • Velocity • Acceleration • Natural Frequency
project managers. It also helps quality and reliability specialists,       Sinusoidal Waveform • Modeling Complex (MDoF) Systems
also personnel in any industry where equipment problems may be             Dunkerley’s and Rayleigh’s Methods
Transmissibility • Isolation • Damping • Examples
encountered during the shipment and use of their product. Project
Review of Structural Design Fundamentals
personnel, structural and packaging engineers learn how to take            Material Properties • Tension and Compression
the effects of vibration and shock into account in the design              Stress and Strain • Shear • Torque • Moments of inertia
process.                                                                   Torsional Stiffness • Torsional Shape Factors
BRIEF COURSE DESCRIPTION The course commences with an                      Bending Stiffness • Instability of beams and flanges
introduction to vibration and then covers basic dynamics theory in-     Frequency and stiffness: Beams, Plates, Gussets
cluding relationships between displacement, velocity and acceler-          Natural frequency and stiffness graphs for various structures
ation. Dunkerley’s and Rayleigh’s methods are introduced, with             Beam Formulas • Plate frequency parameters, examples
examples. Damping, transmissibility ratio and resonance stacking           Column Resonance • Axial Resonance
are addressed. The course then covers basic structural theory:             Example: Stresses in a Loaded Beam
Bolted Connections • Preload • Data on Bolts
tension, compression, stress, strain, torsion and moments of
Design of Bolted Joints • Stiffness Data
inertia. Examples show the torsional shape factors of different
Required flange material area • Material thickness, stiffness
structures. The instructor then addresses frequency and stiffness       Modal Analysis and Modal Testing
of beams, plates and gussets, providing useful graphs, formulas            Applications • Modes, Natural Frequencies
and examples.                                                              Fixturing for Impedance and Modal Testing
Modal analysis is then discussed, with mention of multi-degree-of-         Finite Element Analysis (FEA) • Example
freedom systems, modes and complex systems. Measurement                 Random Vibration: Demonstrations—Sinusoidal Vibration,
and fixturing for modal analysis and testing are covered before            Complex Waveform, Random Vibration
moving on to a brief discussion of random vibration, including              Probability Density • Power Spectral Density (PSD)
power spectral density theory. The concept of RMS acceleration             Shaker Power Spectral Density Response • Equalization
is discussed. Mechanical shock and its design implications are             Calculating the RMS Acceleration from Spectral Plot
Mechanical Shock:
then discussed. Methods of isolating assemblies from shock and
Causes of Shock, Effects and Remedies of Shock
vibration are covered.
Transient or Shock Tests
Fatigue is covered, including discussion of crack-growth rates,            Shock Pulse shapes, Shock Isolation Example
fracture mechanics, the S-N curve, and the use and abuse of ac-         Fatigue: How Materials Behave: The S-N Curve
celerated testing, including Miner’s hypothesis.                           Factors Influencing Fatigue Behavior
Material selection is then covered, with information on overall and        Failure Models & Mechanisms • Crack Growth
Time-Dependent Failures, Time to Failure
design-limiting material properties. Tools are provided for com-
Goodman and Constant Life Diagrams • Miner's Hypothesis
paring different materials. The course concludes with chassis
Accelerated Testing • Durability, Functional Tests
analysis and general design suggestions, such as methods for in-        Material Selection in Engineering Design
creasing natural frequencies.                                              Overall & Design-Limiting Material Properties
CERTIFICATE PROGRAMS This course is required for TTi’s Me-                 Application-Specific Material Properties
chanical Design Specialist (MDS) Certificate Program and may be            Example: Optimization of Shaker Table
used as an elective for any other TTi Certificate Program.              Chassis Analysis Example
Chassis Dynamics, Section Properties
RELATED COURSES Course 310 is equivalent to the
Increasing Resonant Frequency, Torsion • Rotational Inertia
mechanical d esign portion of Course 157-5, Vibration and Shock         Design Suggestions: Overcoming Problems • Design Guidelines
Test Fixture Design, which runs concurrently.                              Structural rules of thumb • Stresses in Printed Circuit Boards
PREREQUISITES: Prior participation in TTI’s “Fundamentals of            Summary, Final Examination
Vibration” or the equivalent would be helpful. Participants will        Award of Certificates for Successful Completion
need first-year college mathematics (or equivalent experience)
and some facility with fundamental engineering computations.
Some familiarity with electrical and mechanical measurements will
Technology
TEXT Each participant will receive a course workbook, including                            (a tti group company)
most of the viewgraphs used in the presentation.                                           Toll-free telephone:
COURSE HOURS, CERTIFICATE AND CEUs Open courses                                            866-884-4338 (866-TTi-4edu)
meet seven hours per day. Upcoming presentation dates can be                               805/715-2638 Fax: 805/715-2650
found on our current open course schedule. Class hours/ days for                           E-mail: Training@ttiedu.com
on-site courses can vary from 14–35 hours over 2–5 days as re-                             http://www.ttiedu.com
quested by our clients. Upon successful course completion, each
310cat.doc 041207
participant receives a certificate of completion and one Continuing
Education Unit (CEU) for every ten class hours.
For schedules, general information and registration forms, see
TTi’s web site.

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