What causes vibration in a fan?
Vibrational analysis is exactly what its name entails – it is the action of analyzing an item's vibrations. ... It's important to note that there are many factors that can affect the vibrational level of an industrial fan – its wheel balance, rotational speed, motor operations, components, and even wiring.Aug 26, 2020
What is vibration analysis?
Vibration analysis is a process that monitors the levels and patterns of vibration signals within a component, machinery or structure, to detect abnormal vibration events and to evaluate the overall condition of the test object.
What causes a fan to be unbalanced?
Ceiling fan wobble is caused by imbalances in the fan blades or blade holders, misalignment of blades, excess dust accumulation or just loose ceiling fan mounting. Restore your fan to its smooth-running days of old before you wear down the moving parts.
What is motor vibration analysis?
Motor current signal analysis (MCSA) is used in identification of artificially induced mechanical faults, and it is also supported with vibration signal analysis. The most common mechanical problems; mechanical unbalance, shaft misalignment, and bearing failures are investigated experimentally.
How does vibration affect a fan?
Most fans are designed to operate below the critical speed, but if a fan is operated above the critical speed, the vibrations that occur while passing through the resonance band can lead to severe damage to bearings, seals, etc. Similarly, operating at the structural resonance point should also be avoided.Jun 8, 2018
What are the 3 basic characteristics measured in vibration?
How far (amplitude or intensity), and how fast (frequency) the object moves helps determine its vibrational characteristics. The terms used to describe this movement are frequency, amplitude and acceleration.
Why do we need vibration analysis?
The primary goal of vibration analysis is to identify faults within a machine and then alert personnel that some type of action needs to occur. Problems start to occur when the needed frequency of the data collection is not aligned with the maintenance strategy.Feb 20, 2018
What is impeller fan?
A fan impeller is typically attached to the rotating shaft. External rotor motors essentially have the opposite orientation, with the rotor rotating on the outside of the stator. ... A fan impeller can be attached directly to the external rotor, effectively creating a motorized impeller.May 1, 2019
What are the types of vibration?
A vibrating motion can be oscillating, reciprocating, or periodic. Vibration can also be either harmonic or random. Harmonic vibration occurs when a vibration's frequency and magnitude are constant. A vibration is random when the frequency and magnitude vary with time.Dec 18, 2018
How is vibration measured?
Vibration is most commonly measured using a ceramic piezoelectric sensor or accelerometer. An accelerometer is a sensor that measures the dynamic acceleration of a physical device as a voltage. ... The benefits of an accelerometer include linearity over a wide frequency range and a large dynamic range.Jul 15, 2020
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How does vibration testing work?
Vibration testing is accomplished by introducing a forcing function into a structure, usually with some type of shaker. Alternately, a DUT (device under test) is attached to the "table" of a shaker. Vibration testing is performed to examine the response of a device under test (DUT) to a defined vibration environment.
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What is the frequency of vibration in a fan?
- The primary frequency of vibration was the fan running speed as shown by the data in Figure 4. The trend of overall vibration level showed large variations in amplitude, with an excursion to 0.975 in/sec pk. (see trend plot in Figure 4.) The time waveform showed sinusoidal motion.
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What does the data on the fan bearing data indicate?
- Vibration data on the fan bearing housings indicated that most vibration was occurring at one times the fan rotational frequency in the axial direction. A bubble of energy at the base of the run speed frequency in the spectrum suggested structural resonance.
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Why does my fan vibrate when I run it?
- It was concluded that the most likely source of the forcing vibration was fan unbalance. However, the relative flexibility of the frame, lack of adequate number of hold-down bolts and deteriorated grout would allow significant vibration response of the fan base and the supporting frame even at low unbalance force levels.
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How do you test a gas fan for vibration?
- Review process historical data for fan gas temperature and inlet guide vane settings, if available, to determine if vibration levels are related to changes in gas density or flow rate. Chip grout from beneath the channel frame at the sheave end of the fan base.
