Shake, rattle and roll for reliability studies
A
Calibration Dynamics product story
Edited by the Engineeringtalk editorial team
Apr 24, 2007
Available from Calibration Dynamics, MB Dynamics manufactures a range of shakers used for studies of modal analysis.
Modal analysis is used to determine the frequency at which vibration naturally occurs within a physical system, and the modal shapes it assumes within its vibration.
This analysis is a critical component of the design of a vibration model.
Structural elements such as complex steel floor systems can be particularly prone to perceptible vibration irritating building occupants and can also damage sensitive equipment.
This will shorten equipment life and can cause premature or complete failure.
Fatigue analysis can also be used to determine the potential for failure/damage resulting from rapid stress cycles of vibration.
Detailed modal analysis determines the fundamental vibration mode shapes and corresponding frequencies.
This can be relatively simple for basic components of a simple system, or extremely complicated when qualifying a complex mechanical device or a complicated structure.
Calibration Dynamics offers a broad range of shakers and excitation systems.
Standard shakers are available in a variety of sizes offering frequency ranges from DC to 10kHz bandwidth and force ranges up to 1115N (peak).
A comprehensive and almost inexhaustible series of mounting arrangements can be produced, allowing the mounting of each shaker in almost any position to facilitate accurate testing in the most arduous applications.
Designed by a team of world's most respected modal testers, including University of Cincinnati professors, the Modal 50A was developed to be highly portable, easy to set up and simple to use.
It is these design features that makes the Modal 50A a number one selling exciter.
The Modal 50A (and multiples thereof) is ideal for exciting structures smaller than a full-sised car.
A centre bore extending through the armature, housing, trunnion base, and inertial masses allows a stinger to be easily positioned along its axis.
It may then be placed as close to the test article as desired and the chuck tightened down to grip the stinger firmly.
The stinger need not be cut off, thus retaining flexibility for future use in different orientations and applications.
An oscillatory force of 222N keeps the tension in the stinger while delivering peak dynamic force.
This virtually eliminates measurement errors due to bending moments and side loads that can result when using compression loading of traditional stingers.
It has a 25mm stroke, sufficient for flexible structures and low frequency "suspended shaker" tests and a 222N dynamic force - enough for larger test articles.
Its lightweight armature (les than 180g) enables the testing of small items and also minimises mass loading, dramatically reduces force drop-off at resonances of the test specimen.
And its broad frequency range (1-4000Hz) handles almost every modal survey.
The Modal 50A is also suitable for multi-shaker random, single point random, multi-point sine dwell and even burst random.
The Modal 110 delivers 500N of force and a 38mm stroke peak-peak.
This gives it twice the force and 50% more stroke than the Modal 50A.
The "big brother" to both of these though is the Modal 250A.
It delivers a massive 1115N force with a stroke length of 51mm peak to peak.
This means that it is capable of performing total vehicle modal tests on anything larger than your average car, ie a truck, jet, even a space shuttle.
The smallest member of the MB Dynamics shaker family is the Modal 2.
It is MB's smallest exciter to date.
It delivers a 9N force and a 4mm stroke peak-peak.
With a height of just over 120mm and an 89mm square base the Modal 2 is very small which makes it ideal for testing in compact areas.
The armature through hole furthers the versatility by allowing easy adjustment of the 10-32 threaded stinger.
MB Dynamic's promise to provide the most accurate test systems is evident in the moving element which weighs in at 17g.
The AC coupled US-20W amplifier gives the Modal 2 a broad usable frequency range of 10Hz to 10kHz.
And the analogue meter on the front face makes monitoring the 1A maximum output current straight-forward.
This versatile product range is already extensively used throughout aerospace, automotive and structural monitoring environments.
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