Not all vibrations and impulses are alike. DTB can reference the latest industry standards or design a unique vibration or shock testing profile, according to your requirements, using a wide variety of methodologies and test equipment in our extensive facilities.
Our electromagnetic shakers, electro-hydraulic actuators, and eccentric mass vibration test generators are used in forced vibration testing and can apply sinusoidal, transient, or random vibrations to your product in order to produce the required motions or responses for our vibration analysis.
Shock (Hammer & Pyrotechnic)
Modern engineering techniques often call for unusual and difficult shock and vibration testing requirements. DTB’s team of highly skilled engineers and technicians has years of experience in setting up and running these types of dynamics tests.
Our shock testing engineers can condition, plot, and analyze up to 128 channels of real-time data, including shock response spectrum (SRS), fast Fourier transform (FFT), or modal analysis.
The typical shock testing event can be performed on one of our Unholtz-Dickie T4000 or T1000 vibration test systems. When coupled with 360 KVA of amplifier power, these systems can achieve shock testing levels of over 100 G. We also have an in-house T5500 with 60 in. x 60 in. head expander and a 3 in. displacement.
For tests that require higher levels or longer durations of testing, DTB has additional mechanical shock testing machines. We can develop half sine shock test protocols to levels of 3,000 G and 4 ms using our unique facilities. Longer duration shock testing pulses have also been obtained up to 100 ms using our catapult facility, including pulses that are over 1 sec. in duration.
Low Frequency (Seismic & Shipboard)
Seismic testing is regularly utilized to determine the effects of movements or vibrations from a seismic event (earthquake).
Our horizontal and vertical seismic testing facilities, manufactured by the Team Corporation, offer low frequency, high displacement seismic vibration capabilities to meet the Telcordia GR-63-CORE Zone 4 seismic testing requirements. These seismic testing systems are also used for MIL-STD-167 and MIL-STD-810 vibration and shock testing.
Our full-service, low frequency vibration facility is capable of the following:
- Replicating a Zone 4 seismic event
- Testing payloads greater than 6,000 lbs. with a center of gravity 5 ft. above the table
- Providing dynamic force ratings up to 32,000 lbs. (horizontal and vertical)
- Testing involving a table size of 6 ft. x 8 ft. (horizontal) or 6 ft. x 6 ft. (vertical)
- Testing involving a full rated performance up to 100 Hz
- Providing a dynamic displacement of 10.5 in. with an overall displacement of 12 in.
- Providing a maximum velocity of over 40 in./sec.
Acceleration testing ensures that a material can structurally withstand the steady state inertia loads that are induced by platform acceleration, deceleration, and maneuvering in the service environment, as well as function without degradation during and following exposure to these forces. Acceleration tests are also used to ensure that a material does not become hazardous after exposure to crash inertia loads.
Our unique test facility includes both underground and above ground centrifuges that can be used for acceleration testing. Our underground 12 m (40 ft.) centrifuge can impose a maximum acceleration of 150 G on test items and can carry a maximum payload of 680 kg (1,500 lbs.). Our above ground centrifuge can impose a maximum acceleration of 200 G on test items and can carry a maximum payload of 6.80 kg (15 lbs.).
Centrifuge tests are used in order to meet the acceleration requirements of MIL-STD-810, Method 513.7; MIL-STD-202; RTCA/DO-160; and other specifications.
We have adjustable fixtures that allow test items to be tilted and rotated in order to match combined load vector test requirements. We have the ability to monitor your test item during the test with the use of slip rings and RF rotary joints.
DTB can handle your unique acoustic noise testing requirements. We can perform structure-borne or airborne measurements, per MIL-STD-740. In the event that the test item may be in its final installed location or may not be easily transported to DTB, our engineers and technicians can visit your site in order to complete the acoustic noise testing process.
DTB’s electrodynamic vibration facilities have the enhanced capability of controlling the temperature and humidity around a test item through the use of one of our six add-on environmental simulation chambers.
These environmental simulation chambers can provide rapid rates of temperature change, while the vibration facilities can handle 18,000 force-lb. loads with frequencies up to 2,000 Hz.
In a single vibration test, we can offer advanced data acquisition, along with mechanical vibration, electrical stress, pneumatic, or hydraulic loads, with controlled temperature and humidity.