[An Introduction To Vibration Analysis – Part 5] Welcome to Part 5 of our ongoing introduction to the world of vibration and acoustic measurement and analysis. Here, we look specifically…
As its name suggests Operational Deflection Shape analysis shows the vibration pattern experienced during normal operational condition. This is different to other structural vibration tests such as impact hammer tests, bump tests or shaker tests which require a more controlled excitation force and are used to determine specific characteristics of the structure under test, such as natural or resonant frequencies.
A long-standing customer brought along his power station turbine test rig so that we could give the P8000 hardware and DATS software a good workout. Here's a video of the…
Picture the scenario; you have captured some noise & vibration data from a rotating machine. Typically, this might be noise in a vehicle cabin, but could have been anything from…
The DATS Rotor Runout Measurement package can be used on any shaft where the following probes are available... A LVDT (Linear Variable Differential Transformer) probe. This is basically a contact…
Recently, we decided it was about time we had a new model for testing, training and demonstrations. Specifically, we wanted something that would allow us to test the full capability…
The use of a vibration condition monitoring system for monitoring vibration from large rotating machines fitted with fluid-filled journal bearings such as steam or gas turbines is well understood. Vibration from these components generally falls within the main harmonics or orders of the shaft rotational speed such as 1st, 2nd 3rd or 4th harmonic. Some energy may also exist below the 1st order, called the sub-synchronous component. Most energy exists below 1KHz and so standard displacement probes or velocity transducers are generally fitted. The Prosig PROTOR system collects this data in amplitude and phase form, relative to a ‘once-per-revolution’ phase reference signal, as standard and allows data to be displayed in real-time as mimic diagrams, trend plots, orbit and vector displays.
Ever been lying on the beach and begun to wonder about the state of your LP turbines? Or out on business and anxious to know if that troublesome exciter bearing has settled down? Well with a Prosig PROTOR system and a smartphone anything’s possible. Many of you will be familiar with using your phone as a camera, music player, web browser, email client, calculator or even a navigation device, but not many will have anticipated using it for vibration condition monitoring!
Here we will explain how to use one of the new Android based phones to connect to a PROTOR system. For the purposes of this example we used an Android-based phone and a WiFi connection. It is equally acceptable to use the network providers 2G/3G data connection. And although we chose an Android based phone, similar VNC-viewer apps exist for the iPhone and other smartphones.
Shaft displacement is an important vibration measurement for rotating machines. Shaft displacement is usually monitored by non-contact shaft displacement probes such as eddy-current probes. These probes produce a voltage proportional to the distance of the shaft surface relative to the tip of the probe. For maximum benefit, ideally two shaft displacement probes will be fitted to measure the displacement in both the horizontal and vertical directions. Actually the probes do not have to be exactly horizontal and vertical as Prosig’s PROTOR system is able to resolve into the horizontal and vertical directions.
