Isolating COTS Equipment aboard Military Vehicles
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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.
Each participant will receive a copy of Wayne Tustin text ‘A minimal-mathematics Introduction to the Fundamentals of Random Vibration and Shock Testing, HALT, ESS & HASS, also Measurements, Analysis & Calibration’ plus a binder of instructor LeKuch’s notes on isolating shipboard electronic equipment.
What You Will Learn:
- 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.
Vibration and shock, introduction and fundamentals
- Equipment in military, naval, airborne and commercial/industrial environments
- Military standards: 810, 167, S-901D and commercial requirements
- Land vehicles
- Airborne vehicles including helicopters
- Ship vibration and Navy Floating Shock Platform (FSP)
- Vibration and shock data – inputs and responses
- Sine and random vibration
- Shock response spectra (SRS)
Fragility and protection of equipment
- Failure criteria and functional performance – stress levels
- Understanding vibration and shock requirements – allowable acceleration levels
- Fundamentals of isolation – protection methods – dynamic load factors
- Stiffness, damping and motion
Guidelines for selecting isolation
- Protecting vehicle and equipment on board
- Standard and custom isolator designs
- Understanding isolator properties
- Interpreting manufacturer’s data
Proven design features
- Case histories and typical installations – military and industrial requirements
- Equipment layout – engineering details and accessories
- How to design the complete isolation and enclosure system
- Reducing equipment costs and improving schedules
Methods of predicting shock and vibration input and response
- Examples using SIMPLE, DDAM, UERD tools and other analysis methods
- Comparison with measured results
- Design parameters and allowance for changes
- Modeling of the equipment and its installation
- Determining significant modes
- Effects of non-linearities on isolation
- Minimizing the response
Qualification testing and evaluation of equipment
- How to avoid re-test – extension by analysis
- Validation using shock response spectra
- Shock and vibration qualified principal units
- Sub-system and component tests
- Military and industrial practice
Discussion of individual projects
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. For Navy shipboard shock protection, Herb developed elastomeric high deflection mounts.
Herb provides consulting and marketing support to firms that design and manufacture (as well as to users of) specialized shock and vibration isolation mounts and electronic enclosures. Herb can design or can assist with design, with engineering and with installation of isolated electronic racks.
Herb’s FEA work includes modeling and simulation of dynamic events. For commercial industries, Herb has directed mechanical construction projects in new power plant facilities, utilities and major transportation centers. Herb also analyzed and designed improved piping systems to be installed in a corrosive scrubber plant environment. Herb has been involved with SAVIAC (Shock and Vibration Information and Analysis Center) for nearly twenty years and in 2007 gave a training session on “Selection of Isolation for Navy 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.
His early experience was with the Autonetics Division of North American Aviation, RCA Astro-Electronics and the Electro-Optics Group of Perkin-Elmer Inc. He was later with Aeroflex International for fifteen years, eventually becoming Chief Engineer and VP – Isolation Products Division. Still later Herb was President of the VMC/Korfund Subsidiary of Aeroflex.
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