The crest factor is also referred to as the peak-to-average ratio, or the the peak-to-average power ratio, for a waveform. It is the ratio between the peak amplitude of a waveform and the RMS value, as shown in the following equation: C = Peak amplitude RMS
Dampers have been widely used to reduce the amplitude of vibration by absorbing or dissipating energy. In general, damping can be divided into three types: viscous damping, column or friction damping, and solid (internal) or structural damping. We will focus on viscous damping in this
A coupling is a mechanical device or hub used to connect two shafts to transmit power from drive end, for example: motor, to driven end, for example: pump or fan. Other purposes are to protect overloads and to provide mechanical flexibility due to misalignment. They
Noise in a vibration signal can creep in from background vibration sources such as noise generated by the machine being monitored, or from adjacent machinery. Typically the noise signal has low amplitudes and is close to zero in the spectral data; however, in some instances
Traditionally, most compressors are reciprocating compressors; fluid is compressed through piston mechanism, positive displacement. Reciprocating compressors can be used in a wide range of applications from household to gas and oil refineries. Today, centrifugal compressors are common and are used to increase pressure of a
There are five main stages in order to successfully accomplish vibration analysis and run a good precision maintenance program; they are: 1. Detection 2. Analysis 3. Root-Cause Analysis 4. Repair and Maintenance 5. Verification Detection The first step in vibration analysis is detecting a problem. This can