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low emissions. For example, one greenhouse application feeds the exhaust directly to the plants to supply warm, CO2-rich air. Other applications include hybrid-electric city busses, offshore oil-drilling platforms, and farms where fermenting waste tanks provide the fuel gas for operating the microturbines. Vibration Testing An engineering team consisting of a Principal Turbomachinery Engineer, and a Senior Rotordynamics Engineer at a leading microturbine manufacturer, use IOtech ZonicBooks with eZ-TOMAS to monitor and record the microturbines’ vibration levels during both production and development testing to ensure they remain within the design envelope. They also test production units in such a unique way that only the eZ-TOMAS software can satisfy their needs for analyzing rotating machines. Because the microturbines run at extremely high speeds, acquiring test data is critical to ensure that vibrations are not dangerously out of tolerance and cause the microturbines to fail. The ZonicBook measures and records synchronous, sub-synchronous, and super-synchronous vibration, which is at, above, and below running speed. The eZ-TOMAS has a built-in feature for condition monitoring alarm levels. It contains a unique, complex speed- vibration matrix, which applies constantly changing pass/fail criteria based upon the speed and time-at-speed operating point of the engine. A “Production Test Report” provides a final look at the engine as the data are summarized on a formatted output page. No further data processing is needed. IOtech ZonicBooks were selected over another stand-alone system that the engineers were already familiar with, initially because the other instrument was unable to measure turbine speed over 60,000 rpm. “In the beginning,” says the Principal Turboma- chinery Engineer, “we had to use some basic FFT analyzers in the test cell, and a person had to manually set up the instrument and watch it constantly; they were essentially stand-alone units with no software capability. We decided to upgrade the setup and find a new solution. In contrast to basic FFT analyzers, the ZonicBook records continuous vibration data, contains built-in FFT software, easily records the turbines’ top vibration levels, provides the added safety of an automatic shutdown, and prints out a record, all for one-half the price. We found the system to exceed our expectations.” The engineers use from one to eight channels to monitor very high-frequency rotor vibration levels that could reach several thousandths of an inch on each microturbine. Proximity probes are located near each oil-free air bearing that supports the rotor. The eZ-TOMAS software for monitoring and recording multiple channel vibration lets them analyze the proximity probes’ output amplitude, frequency, and phase in real time and compare both synchronous and asynchronous peak amplitudes in different locations to the complex pass/fail criteria, as well as the automatic shutdown limits. Typical Array of Microturbines 2 Microturbine Diagram IOtech • 25971 Cannon Road • Cleveland, OH 44146 • (440) 439-4091 • Fax (440) 439-4093 • sales@iotech.com • iotech.comPDF Image | Microturbine Testing using the ZonicBook
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