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Movement of the shaft center lines associated with (or due to) a change in machinery temperature between the static and operating conditions.
A secondary alignment method used to measure thermal growth. This method is only used for calculating the vertical thermal growth of the shaft centerline due to a change in temperature. The shim plane, under the machine feet, serves as a benchmark. This technique is usually used for machines under 500 HP. The technique uses the linear expansion equation where: Expansion in mils (E) is equal to the average change in temperature, F° (T) multiplied by the vertical distance from the shim plane to the shaft centerline, in inches mutiplied by the coefficient of thermal expansion, in mils/inch F°. E =3D T X L X C This is to be calculated for both sides of the bearing. The number of temperature readings is not critical, but at least 4 is recommended. The average change in temperature is between the offline and online temperatures.
Total Indicator Runout. The total movement in mils of a dial indicator after a given rotation of a rotor.
The maximum permissible deviation from the specified quantity.
Any device that translates the magnitude of one quantity into another quantity. Three of the most common transducers used in vibration measurements are accelerometer, velocity transducer, and eddy current probe.
The output to input relationship of a structure. Mathematically it is the Laplace transform of the output divided by the Laplace transform of the input.
A transform is a mathematical operation that converts a function from one domain to another domain with no loss of information. For example, the Fourier transform converts a function of time into a function of frequency.
The Fourier transform of the forced response of a structure measured at one location to the response at another location.
A filter whose cutoff frequencies are adjustable, either manually or under remote electrical control.