Available vibration testing uses some kind of shaking action in order to introduce the forcing function that makes it possible. Each shaker possesses a DUT, or tool under test, on the bottom of it. Sometimes frequencies are quite small, in which case servo hydraulic shakers are used for testing. High frequencies often utilize electrodynamics shakers for the examining. Usually, an input or control point is kept at a precise acceleration and located in one or more fixtures on the DUT-side. Maximum vibration level, or resonance, is another reaction point that can be found on these tools, as well as minimum vibration level, or anti resonance.
Random and sine test are two typical vibration tests run on equipment. Both can be used whenever their needed, either at the same exact time or at complete different times. Random, or all frequencies at one time, is a test more likely to show real world environments, for instance a road input in compression to a moving vehicle. A single DUT axis is often used to conduct most vibration tests, even when most real world situations revolve around using various axes at a time.
When an early input of a mechanical system is releases and then allowed to move freely, it is called free vibration. When a child is on a swing and the person grasping them back lets go, this is an example of free vibration. Hitting a tuning fork many times and letting it ring for a while is also an case of free vibration. The frequencies will go down to zero if the mechanical system will let one or more normal frequencies vibrate.
Whenever an constant motion or force is done to a mechanical system, forced vibrations will occur. The vibrations that occur within a building during an earthquake or in a operating washing machine when the machine becomes unbalanced, that is one of many diverse examples of forced vibration, just as a truck crossing the road also caused transportation vibration. The order of magnitude in a mechanical system is reliant on the amount of force or motion that is given when vibration or frequencies occur in machinery.
Vibration testing fundamentals are made and modeled in the simple mass spring form. Spring mass damper models are intricate structures, so things like automobiles can be seen as a form of spring mass damper. A regular harmonic oscillator is an example of a model that serves as a mass spring damper. The behavior seen in the simple harmonic oscillators are often similar to others because of the RLC circuit.
Random and sine test are two typical vibration tests run on equipment. Both can be used whenever their needed, either at the same exact time or at complete different times. Random, or all frequencies at one time, is a test more likely to show real world environments, for instance a road input in compression to a moving vehicle. A single DUT axis is often used to conduct most vibration tests, even when most real world situations revolve around using various axes at a time.
When an early input of a mechanical system is releases and then allowed to move freely, it is called free vibration. When a child is on a swing and the person grasping them back lets go, this is an example of free vibration. Hitting a tuning fork many times and letting it ring for a while is also an case of free vibration. The frequencies will go down to zero if the mechanical system will let one or more normal frequencies vibrate.
Whenever an constant motion or force is done to a mechanical system, forced vibrations will occur. The vibrations that occur within a building during an earthquake or in a operating washing machine when the machine becomes unbalanced, that is one of many diverse examples of forced vibration, just as a truck crossing the road also caused transportation vibration. The order of magnitude in a mechanical system is reliant on the amount of force or motion that is given when vibration or frequencies occur in machinery.
Vibration testing fundamentals are made and modeled in the simple mass spring form. Spring mass damper models are intricate structures, so things like automobiles can be seen as a form of spring mass damper. A regular harmonic oscillator is an example of a model that serves as a mass spring damper. The behavior seen in the simple harmonic oscillators are often similar to others because of the RLC circuit.
About the Author:
If you would like more related information on machinery, then you can visit the website of bearing checker . More view on this aspect at kittiwakeholroyd.com/.
No comments:
Post a Comment