Vibration Testing

September 12, 2016

Testing2

 

Vibration Testing

 

Vibration testing

Case Study – One Stop Shop for Vibration Testing

That device on which you need to perform vibration testing will spend its lifetime in different environments. Because these environments exhibit unique vibration profiles, we use vibration control techniques tailored to each environment. Our vibration controllers can control with sine, random, sine-on-random or narrow band random-on random control strategies.

Sine vibration testing has been used for the longest time because generator-based sine wave output controllers were the simplest to build. Unfortunately, sine vibration has few real-world parallels. But sine vibration is still useful for experimentation and for determining resonances.

A more accurate simulation of many real-world conditions is achieved with random vibration control. Random vibration testing subjects the product to all of the frequencies within a band of frequencies. A typical random vibration control strategy will shape the vibration energy profile (power spectral density – PSD) to correspond with frequency distribution of the in-use environment.

Sine-on-random vibration testing superimposes a sine vibration signal onto a random signal to simulate helicopter or aircraft gunfire environments. Multiple sine frequencies can be superimposed at one time and the sine tones can be swept throughout the spectrum.

Narrow band random-on-random vibration testing superimposes a sweeping narrow band random vibration signal onto a random vibration signal to simulate the track patter of tracked vehicles.

Clients with HALT reliability testing requirementscan  combine a rapid temperature ramping environment along with vibration testing in an AGREE chamber using temperature transition rates as high as 20°C per minute.

In addition to our multi-channel vibration controllers, our data acquisition systems can be used to acquire time based acceleration data in the field. We can process this data, or similar client acquired data to produce a random vibration PSD profile for controlling a vibration test.

Where clients do not have their own vibration fixtures, we can design, fabricate and qualify a vibration fixture using our in-house vibration fixture team. Many times this internal capability has saved our clients time and cost by not having to source separate suppliers for testing, design, fabrication and fixture qualification.

Shakers

    • Frequency Range: From DC up to 3,000 Hz

 

    • Displacement: 50 mm maximum

 

    • Product Weight: 455 kg with supplementary support

 

    Acceleration: 100 g maximum

Controllers

    Input Channels: 16 accelerometers maximum

Data Acquisition

    Channels: 10 accelerometers maximum

AGREE Chamber

    • Temperature Range: -70°C to +120°C and up to 95% RH

 

    • Ramp Rate: 20°C per minute max.

 

    • Largest Inside Dimensions: 1.37 m L x 1.37 m W x 1.00 m H

 

    • Door Opening: 1.37 m W x 1.00 m H

 

Methods

 

AREMA Part 11.5.1
ASTM D999 Method A1
ASTM D4169
CETP 00.00-L-412
CS-11982
EIA-364-28E
GMW3172
GMW14096
IEC 60068-2-6
IEC 60068-2-64
IEC 61373
IEC 68-2-26
ISO 16750-3
JIS D 1601
JIS E 3014
MIL-STD-167
MIL-STD-202 Methods 201A,
204D & 214A
PF-4088
RTCA/DO-160E Sect. 8
SAE J575

A2LA ISO 17025