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presented by
Herb Lekuch
September 23-25, 2008
(8am - 4pm)
at
Shock Tech,
360 Route 59
Tallman, New York 10982
Course Objectives
The course provides proven details of
- how to select isolators,
- design isolation systems and
- properly use commercial enclosures for COTS equipment,
- Shock and vibration analysis methods,
- equipment fragility, and
- applications to MIL-S-901D and MIL-STD-167 tests,
- description of the tests,
- review of shock and vibration conditions and
- test data from decks having natural frequencies 8 Hz, 14 Hz, 25 Hz, etc.
Can one avoid these high costs and at the same time improve the design? Successfully meeting the tests and qualifying equipment the first time through is a principal objective of this course.
The Navy’s MIL-STD-901D barge test is especially severe. COTS equipment often cannot meet the shock conditions unless protected in properly designed enclosures. Isolation of equipment and how the isolation mounts and enclosure are selected and designed are extremely important. Selecting the wrong isolator can be worse than hard mounting. Shock and vibration tests are very expensive. Failure may require extensive modifications to equipment and then retest in order to validate design and equipment. Delays to the program are inevitable, costs increase rapidly and schedules can be badly affected.
Course Outline
Overview
- SV qualification of present and future shipboard electronic equipment
- Typical SV-induced damage – description, photos, history, functional problems
- Benefits of isolating COTS electronics – reduced cost, improved designs, reliability
- Shipboard and life cycle SV conditions - combat situations modeled by ship shock
- Typical SV levels vs. performance criteria
Shock and vibration (SV) awareness
- Basic theory of isolation; technical literature beyond that provided; references
- SV tests – standards, specifications, test labs – description and documentation
- MIL-STD-167, MIL-S-901D, MIL-STD-810G testing and requirements – photos & videos
- Examples of shipboard qualification tests and data - photos and videos - details of performing a test
- Interpreting procurement specifications and test requirements – emphasize need for agreement
- Analyzing SV test data – frequencies, accelerations, displacements and velocities
Damage caused by SV testing
- Characterizing SV tests - vibration, drop tower, barge, hammer tests - videos and photos
- Review of overstress, fatigue, deterioration, degraded performance of COTS
- Measurement and data acquisition during tests, data analysis - interpretation - relevance to damage prediction
Selecting and using SV isolators
- Equipment design levels – example: COTS in equipment enclosures
- Isolator performance – showing how isolators work – demonstration videos
- Emphasize commercial passive mounts – introduce semi-active and active designs
- Types of mounts – varieties of isolators – manufacturers
- Comparison of isolator properties – elastomer vs. cable, others - stiffness, damping and loads
- Isolation system design – guidelines for selecting and locating mounts
Designing isolation systems
- Shipboard applications – different locations throughout various ship types
- Examples, features and design guidelines – design drawings, single and multiple cabinets
- Computer analysis of isolation system performance – sample calculations
- Calculation methods – FEA and modeling – videos and animations
- Use of Shock Response Spectra (SRS) – typical barge shocks – inputs and responses
- Validating results – barge and vibration test vs. predictions
Selecting electronic enclosures
- Performance requirements – design objectives, allowable SV loads, multiple directions
- Interaction of isolators and enclosures (single and multiple enclosures, workstations)
- Related aspects – rotational stiffness, sway space, airflow, access to COTS
- Equipment maintenance - replacement, upgrading of systems may require new isolators
- Proof of performance – past mistakes, what not to do
Selecting isolators and isolation systems (details)
- Matching isolator system to expected SV levels
- Isolator effectiveness – enclosure dynamics – non-linearity
- Isolators can exacerbate the problem – discussion and animations
- Examples of problems and solutions – photos, drawings
- SV analysis and examples – qualification by extension
- Avoiding retest and extra costs
Discussion of participants’ applications and projects
Design review by technical specialists (LeKuch and others)
Course summary
Award of certificates
Laboratory demonstration
Shock Tech is allowing us to use its electrodynamic shaker to illustrate the benefits of properly-chosen isolators.
Location
Shock Tech (map and directions)
360 Route 59
Tallman, NY 10982
Phone: (845) 368-8600
Suggestion for accommodation
Holiday Inn
3 Executive Blvd Suffern, NY 10901
(845) 357-4800
-> Ask for 901D’s corporate rate.
Hours
8am to 4pm
Fee
Fee is US$2,395 per student. Payment in advance via check, VISA or Mastercard preferred credit cards or bank transfer (ask for transfer details).
For registration and payment received one month prior to course, deduct $100. For three or more participants from an organization and payment received one month prior to course, deduct $200 each.
For whom intended
Professionals responsible for the shock and vibration integrity of equipment in Navy and other military systems - mechanical engineers and designers, analysts, COTS users, project managers, environmental test engineers and equipment packaging designers.
Technical personnel who are involved with reliability of COTS electronic equipment in Navy systems and with passing the Navy’s shock qualification processes and tests.
This course is for engineers and designers who want to
- improve their mechanical designs,
- correctly select
- isolation mounts and
- enclosures,
- learn how to analyze
- the mechanical design of their equipment and
- predict its shock and vibration response,
- understand the test requirements,
- apply workshop examples of proven designs,
- qualify their equipment (including COTS electronics),
- learn how to incorporate
- tech refresh and
- equipment upgrades
- through extension by analysis.
The focus is on commercially available isolators and enclosures and on
avoiding the complexity and cost of special designs.
Contact Information
Tel: (805) 564-1260
FAX: (805) 966-7875
E-mail: tustin@equipment-reliability.com
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Herb Lekuch
Herb LeKuch’s extensive background in mechanical design, analysis and test was developed over thirty years of aerospace, military and industrial experience. His principal technical work has been in shock and vibration engineering of electronic and mechanical products, also electronic packaging, structural and thermal analysis, environmental test and design engineering. His projects include Navy shipboard, wheeled and tracked vehicles, aircraft and spacecraft applications.
Herb’s education includes BSME and MSME degrees in Mechanical Engineering from the City University of New York. To these he has added graduate level training in dynamics, structures, thermal analysis, optics and reliability and training on a variety of CAD and FEA software programs.
For the past several years, Herb has provided consulting and marketing support to Shocktech/901D LLC and other firms. Shocktech/901D LLC designs and manufactures specialized shock and vibration isolation mounts and electronic enclosures. Herb provided the principal design and engineering of the company’s product line of isolated electronic racks. Herb also developed their elastomeric high deflection mounts for Navy shock protection.
Herb is also an ERI Specialist. Click here to read more about him. |
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