everything that rotates
                        needs to be balanced


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Vibration Information for rotating machinery applications.


Transducers: Displacement, Velocity, and Acceleration

Monday, May 16, 2011

Displacement transducers, which are also known as eddy current probes or proximity probes are non-contact transducers used to measure relative movement between the shaft and the tip of the sensor. They are typically drilled into journal bearing or sleeve bearing. Hence they are difficult and expensive to install. Proximity probes are very useful in plotting orbit diagram-how the shaft is moving within the bearing when installed 90o apart. Displacement transducers are suitable for low frequency measurement such as in turbine and compressor applications.  Read More

The Importance of Balancing for Energy Efficiency

Thursday, May 12, 2011

Imperfections during manufacturing usually impact the balance in rotating machinery. It is expected that the center of rotation and the center of mass will not coincide perfectly, causing a mass imbalance in the system. Manufacturers currently overcome this issue by using specialized machinery to detect the location of imbalance; they then add or remove material from the machine accordingly to correct the situation. Read More

Forcing Frequencies

Monday, May 09, 2011

Determining the cause of vibration can be a complicated task and it is always important to consider the machine which is being analyzed. Vibration can be associated with various sources such as: Read More

Hand-Arm Vibration in the Workplace

Wednesday, May 04, 2011

Hand-arm vibration has become a concern in the workplace because of the longterm effects of exposure to vibration, and several forums and regulatory bodies exist to address the issues of hand-arm vibration. I had the opportunity to attend and participate in the Hand-Arm Vibration conference in Bologna, Italy in 2007 where several interesting presentations were held to discuss the effects of vibration on the hand, arms and body. Diseases and ailments such as Reynaud's or white finger syndrome are a significant concern for workers who use power tools on a daily basis. Angle grinders are a good example where vibration risks are involved due to continuous and long term use. Read More

Spectrum Analysis of Vibration Data - Synchronous, Non-Synchronous and Sub-Synchronous Vibration

Monday, May 02, 2011

Trying to decipher raw vibration data without additional tools can be extremely complicated; the vibration signal will be a waveform that can be a summation of various independent sources vibrating at different frequencies. Thankfully, the waveform can be mathematically converted into spectral data using a Fast Fourier transform (FFT) that separates it into the independent frequencies. Read More