Vibration Testing Systems

"How loud can that speaker get before it breaks?"

Our solutions for shaker- vibration testing

As you may know, we here at Labrotek like business partners with lots of experience and great reputation. Our partner in vibration tables and systems is DONGLING Technologies and DynaLabs . We offer shaker testing solutions to Scandinavia and Baltics.

Controllers are from our supplier Vibration Research

Our acceleration and LVDT sensors coming from Dytran and  Monitran

  • ES Electro-dynamic vibration test systems, air cooled, water cooled
  • NEW ECOMODE AMPLIFIER FROM Dongling published MAY 2020 ( Energy saving )
  • Slip tables ( magnesium )
  • Permanent magnet shakers ( Modal, PM, Inertial…)
  • Vibration controllers ( Vibration Research : Medallion, VR 9500 )
  • MEMS, GYRO, LVDT sensors
  • Tri-axis electro-dynamic vibration test systems
  • Shakers from low to extra high force
  • Permanent magnet shakers
  • Head expanders ( magnesium )
  • Shaker and environmental chamber combinations
  • Sales, service and maintenance in Scandinavia ( Finland, Sweden, Denmark, Norway and Baltics )

Sensor calibration services:

      

 

Related image

 

 

 

 

Standard Shaker vs. Modal Shaker vs. Inertial Shaker

Standard Shakers

Tests with standard shaker can be driven at different frequencies and amplitudes. In these tests the test specimen can be directly fixed to the shaker armature and vibrating surface area can be enlarged by using a head expander according to the specimen sizes. The vertical excitation can be translated into horizontal excitation by using slip table. In some cases, instead of changing the direction of the motion of the vibration, the part may be rotated and tested. The duration of the test and vibration levels are determined from test standards or real time measurements.

Modal Shakers

Modal shakers are used in the study of vibration behavior of structures. No test specimen is mounted on such shakers. These shakers are mounted to the structure with a stinger and force is transferred from the shaker to the structure via this stinger. The structure under test and / or the modal shaker can be hung with components such as an elastic rope or spring during the test to simulate free-free boundary conditions. In this way it is possible to excite the test sample at different frequencies. As a result, the natural frequencies and mode shapes of the structure can be calculated with the vibration values ​​measured over the structure.

Inertial Shakers

Inertial shakers and modal shakers are similar in usage area. They are used also in tests for examining vibrational behavior of structures such as modal shakers. However, compared to the modal shakers, the connection styles are different. The inertial shaker’s own body vibrates. For this reason, inertial shakers are fixed directly to the structure. It is easier to use than modal shakers. Depending on the dimensions of the structure and the desired excitation frequencies and levels, modal shakers or inertial shakers can be used for vibration testing.

 

We can also supply you with all the accessories you will need:

  • Digital power amplifiers and replacements for of your old amplifiers
  • Vibration controllers for all shaker brands
  • Acceleration sensors and accessories

If you have something more specific in mind, our staff will be happy to assist you and evaluate your testing requirements, so that you will get the equipment you need.

Why electro-dynamic vibration test systems?

Alternative solutions do exist, but electro-dynamic shakers are well suited for most vibration testing with several advantages when compared to other solutions. The frequencies, for example, go much higher than with hydraulic shakers. High frequencies are especially important with electronic components. Also, electro-dynamic shakers are easy to program for random vibration testing.

Important fields of vibration testing

Random vibration testing simulates the real world

You may believe in destiny, but for vibrations the world is full of randomness. For airplanes flying in turbulence and cars driving on rough roads, it’s simply not plausible to generate computer models that would take every single detail into account.

So how do you go about reducing the risk factors of random vibration? Well, you fight fire with fire. Our vibration testing equipment is ready to perform accurately randomized vibration tests based on your specific parameters. Random vibration testing your product until it breaks is the best way to identify hidden design weaknesses and issues.

To further boost accuracy, real life field measurements can be used to simulate more plausible random vibrations.

Sine vibration testing

Sine vibration has the shape of a sine wave (duh). Perfect sine vibrations are somewhat rare in the real world, but they are useful for finding any hidden resonation frequencies within the object. Eliminating resonation means eliminating possible early breaking of your products.

To spice things up, you can use swept sine testing. The frequency and rate fluctuate to better find resonations and design flaws. If the environment for the object is something where the vibrations are well known, such as an engine, the swept sine test can continue for a long time to simulate a lifetime of fatigue stress and vibration.

Shock vibration testing

When your product is meant to be used in environments, where sudden and extreme shocks are to be expected, shock vibration testing is what you need. Standard drop testing answers your questions regarding product resilience when mishandled during transportation or use. Imagine a cell phone maker that wouldn’t rigorously test their phones with drop tests.

First, sensors are attached to your product in critical places that are most severely affected by shocks. Then, you simply drop the product. The falling distance can be anything from a few centimeters to many meters.

The most enthusiastic shock vibration testers are all the makers of things humans use. We tend to drop things. Gun and ordinance industries are other major shock testing fields. Shocks are also very commonplace in rockets. During the booster stage, pyro-shocks heat up certain areas with extreme temperature differences.

Contact us