Vibration Meters

Vibration meters are handheld instruments which are connected to and receive a signal from a vibration transducer and have a capability to process data so as to give an indication of vibration parameters. They are sometimes made specifically to meet certain standard, for example, ISO…

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Vibration Caused by Misalignment

Misalignment can occur when the centerline of coupled shafts are not coincident. Misaligned shafts cause overloading and vibration in a system; this condition can be diagnosed by examining spectral data and looking for specific patterns. Two types of misalignment conditions are possible: • Parallel misalignment…

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Why do Machines Fail?

The source of machine failure can begin from drawing board to poor maintenance practices and machine operating conditions. Every step of how the machine is fabricated, assembled, installed, and overhauled contributes to the life of the machine. To identify potential problems of machine failure, we…

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Structural Vibration

Structures are often exposed to high-energy vibration sources that can have disastrous consequences. Many industries are emphasizing lighter structures that use less material and cost less too, however this has a downside; lightweight structures have inherently lower damping characteristics and resonances can cause extremely high…

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Types of Gears

Gears come in different shapes, sizes and types depending on their intended use. Some of the common type of gears include: • Spur gears • Helical gears • Beveled gears • Worm gears • Planetary gears Spur gears are probably the simplest form of gears with straight…

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Piping Vibration in Machinery

Excessive vibration in piping can cause destructive forces, large displacement or deformation which can result in serious damage or even catastrophic failure to the system. A piping system includes the pipework, pipe joint, welded seams, pipe hangers, flanges, and machinery connected to it. Piping vibration…

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Vibration Transmitted to Foundation

Vibration generated in rotating equipment, for example compressors, pumps, fans, etc, are transmitted through foundation to other machines. Vibration of the plant floor contains a wide frequency spectrum. It is possible that one of these frequencies fall near a natural frequency of a particular machine.…

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New Machinery Acceptance Testing

The most important step before purchasing a new machine is to establish acceptance testing. Acceptance testing can be used to ensure the new machine is free from faults and runs smoothly before placing it in service. The purchase order can specify where and how vibration…

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Resonance

Resonance is a condition where a machine is operating at a frequency close to or at the natural frequency of its structure. This condition excites the structure and causes high amplitude vibrations; this will show up as a “hump” at the resonant frequency in the spectral data…

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