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Vibration

DynaQual provides controlled vibration testing to cover the vibration frequency spectrum, from 5 Hz to 2,700 Hz, including low range frequencies not covered by HALT/HASS testing between 5 Hz and 800 Hz.

Shaker systems complement HALT/HASS testing but provide very different vibration profiles.These systems produce controlled inputs to the test article in various modes to excite the product in defined axes, over specific frequency spectrums and at set acceleration values.

The three common modes of operation on a Shaker system are as follows:

1. Sine-Sweep

The product under test is mechanically fixed to the table and a constant or variable amplitude (G’s) can be applied as the vibrating frequency of the shake system is increased at a set rate (Octaves per minute). The test specification can define the frequency range for the sweep, and the G amplitude. Application: Identifying resonance spikes in the product at specific frequencies.

Vibration testing and transmissibility

Figure 1: Sine-Sweep 10-500 Hz, 1G three product accelerometers monitored

DynaQual also provides “Transmissibility” plots for either mode of operation, and demonstrated above in the lower plots. Simply put, it’s the ratio of the “g” amplitude of the control accelerometer (i.e.-affixed to the vibration plate) vs. the “g” amplitude of the accelerometer affixed to the product at strategic locations. This basic ratio represents the product Transmissibility and identifies potential resonances within the product that may need to be removed through redesign.

2. Random Vibration

The PUT is mechanically fixed to the table and random frequencies are applied. The customer can identify and request limits for ramp rates, maximum amplitude, break points in frequency and the overall Grms that the PUT is subjected to. These parameters determine the Power Spectral Density (PSD) for the test. Application:: Test product for ruggedness and durability, determine transmissibility. A steady application of random vibration will stress the product to its limits.

Random Vibration Testing

Figure 2: Random Vibration 20-2000 Hz

 

See the Shake Table specifications in the “Our Equipment” section.

Random Vibration Testing

OUR EQUIPMENT

ETS

MPA714 / M748A
ED Shaker w/ 2’x5’ Slip Table
15,400 Lb.-F

DynaQual Crate Package Testing
LING 612V ED Shaker Vibration Test table

LING

612V
ED Shaker w/ 3’x3’ Slip Table
6000 Lb.-F

22b1b1a9-6eba-4b67-a610-0fa67c6cce2a

Vibration Research Controllers

VR-9500 — 8 Channels

VR-9500 — 4 Channels

 

Don’t see a test you require? DynaQual offers numerous other testing services not mentioned to meet test specifications. DynaQual Test Labs can add custom services for specific projects that are not shown here or will turn-key the added service with a partner lab to provide a seamless offering to our customers. Please use the inquiry form in the Contact Us tab to submit your request.

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