Dynamics Testing

Stork operates four dynamics testing facilities―Pico Rivera and San Clemente, California and Jupiter, Florida, as well as St. Paul, Minnesota―to measure and evaluate the responses of your parts or systems to dynamic forces they encounter. We perform vibration, acceleration and shock testing to military, aerospace, medical, automotive, and commercial specifications. This testing can be performed individually or in combination with temperature cycling, pressure and hydraulic/pneumatic flow. Our dynamics testing services include:

Vibration. (all facilities) Stork has virtually total dynamics capability. Our multi-shaker facilities are comprised of both electrodynamic and hydrodynamic systems. Stork East-West Technology’s 40,000 force-pound electrodynamic shaker system includes an Unholtz Dickie T-4000 shaker combined with a 60-inch by 60-inch bearing slip table mounted on an integrated unibase. Among Stork EWT’s resources is a 48-inch Magnesium Head Expander to accommodate larger test items in the vertical axis. This equipment, combined with our 20-foot overhead clearance, allows the testing of large/tall items with high overturning movements. Stork EWT recently acquired an m+p international 64-channel, digital dynamics control system for our electrodynamic and hydrodynamic shakers.

All Stork Dynamics Testing facilities help companies meet the latest Mil-Spec requirements, including:

• Narrow Band Random on Random
• Swept Sine Superimposed on Random
• Gunfire Simulation
• Helicopter Rotor Frequency Simulation
• Tracked Vehicle Simulation

Stork facilities also offer:

• Seismic Simulation (Stork EWT and Stork Garwood in Pico Rivera)
• Windmilling Vibration Testing (Stork Garwood Laboratories and Stork EWT) (low frequency, high amplitude)
• Multi-channel digital control systems for our electrodynamic and hydrodynamic shakers (Stork Garwood Laboratories and Stork EWT)

Acceleration. Stork labs operate centrifuges of various sizes and load capacities with arm lengths ranging up to 28 feet  (Stork Garwood Laboratories in Pico Rivera) and 30 feet (Stork EWT). These facilities’ centrifuges are complemented by full instrumentation and power slip rings with video capability available.

Shock. (all facilities) Drop machines, pulse synthesis tables, and other impact equipment available at Stork labs readily accommodate test specimens of various sizes, applying half sine, sawtooth, and square wave forces up to 1,000 g's at Stork Garwood Laboratories and 50,000 g's at Stork EWT with durations ranging from 1 to several hundred milliseconds. Stork experts conduct shock testing on our U. S. Navy-approved, MIL-S-901D, lightweight, hammer shock machines (Pico Rivera, CA; Jupiter, FL) in accordance with  MIL-STD-810F or individual customer requirements.

Stork labs also feature:

• 40-foot drop towers (Pico Rivera, CA; Jupiter, FL)
• 2.5 meter free-fall drop tower (Pico Rivera, CA)

Additionally, Stork EWT and Stork Garwood Laboratories conduct various types of  high level shock response spectrum simulation (pyrotechnic shock), e. g., (a) shaker-digital control; (b) metal-to-metal impact; (c) high-velocity pneumatically driven. Results can be presented in formats of frequency vs. g level or as time history plots and can be analyzed for various “Q” values.

Pyrotechnic Shock Simulation. (Pico Rivera, CA and Jupiter, FL) Stork labs are experienced in multiple methods of producing pyrotechnic shock. Your product can be tested to 50,000 g's, and Stork experts can also provide curve shaping.    

Field Data Acquisition. The experts at Stork EWT can provide field data acquisition of dynamic effects
(stress, strain, acceleration, angular motion, dynamic imbalance), and/or environmental effects (temperature, humidity, rain, corrosive exposure). This acquired data can then be analyzed and reproduced with or without accelerated life margins factored.

Structural/Fatigue. Stork EWT has many different load frames and platforms to simulate single axial static, multi axial static or dynamic load conditions.

• Cyclic fatigue tests are digitally controlled in a closed loop servo system for safety and accuracy.
• Load or displacement control is available.
• Displacement, strain, load, and temperature data are stored for client distribution or analyzed on site.
• Real-time or simulated load profiles provided by the client can be played back through the control system as part of the fatigue testing.

Rotating Load Simulations. Stork EWT has a variety of fixed and variable speed drive systems:

• Up to 1850 horsepower; up to 22,000 RPM
• Electrical loads: 60 Hz, 400 Hz, 1000 amps
• RPM, torque, voltage, frequency and power factors can be recorded on their high speed data acquisition systems.
• Vibration and displacement can be monitored and safety controlled to protect the item under test.
• Preprogrammed RPM vs. load duty cycles can be accomplished utilizing a closed loop control strategy.

Want to learn more about dynamics testing or other services we offer? Send us your question for a quick response.

Stork locations offering Dynamics Testing services:

Related services:

• Climatics/Environmental Simulation
• Package Testing
• Product Testing

News about Dynamics Testing:

• Stork acquires East-West Technology of Jupiter, Florida
• Stork acquires controlling interest in Garwood Laboratories of California

Download:

• View Dynamics Testing brochure (.pdf)