Vibration Oscillating movement around equilibrium position is called as vibration. Vibration measurement is used to check electric motors, turbines or bearings health and resonance. The dynamics of the machine, such as the alignment and balance of the spinning elements, are what cause vibrations in all rotating machines. Monitoring vibration amplitude at specific frequencies can reveal …
What is a vibration level switch and what are its types Vibrating level switches are used to do the level measurement, the operating is based on detecting the damping in a submerged probe when it is submerged in a process medium. There are three types of vibration switches and they are reed, probe, and tuning …
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The process of isolating an object such as isolating machinery from the source of vibration is called vibration isolation. When motorized equipment such as electric motors, fans, or pumps is mounted to a solid structure then the chances of transferring energy from the equipment to the structure in the form of vibration are high. These …
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Vibration meters use PNP transistors instead of NPN because they are inexpensive. The PNP transistors used by the circuits needed a negative bias voltage rather than a favorable bias voltage. Don opted for -18V. This was subsequently altered to -24V to give the transducer more linear range. At the period when the vibration meters were …
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The short answer is that when Don Bently worked on building solid-state versions of the eddy-current measuring system, he had a choice between using N-P-N or P-N-P transistors. Transistors were quite expensive at the time, so he chose the two least expensive: P-N-P The PNP transistors used by the circuits required a negative bias voltage …
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Introduction Sensors used to measure vibration come in three basic types: displacement, velocity, and acceleration. Displacement sensors measure changes in distance between a machine’s rotating element and its stationary housing (frame). Displacement sensors come in the form of a probe that threads into a hole drilled and tapped in the machine’s frame, just above the …
Definition Basically, vibration is oscillating motion of a particle or body about a fixed reference point. Such motion may be simple harmonic (sinusoidal) or complex (non-sinusoidal). It can also occur in various modes – such as bending or translational modes – and, since the vibration can occur in more than one mode simultaneously, its analysis …
The instruments which are used to measure the displacement, velocity or acceleration of vibrating body are called vibration measuring instruments. What is Machine Vibration? Machine vibration is simply the back-and-forth movement of machines or machine components. Any component that moves back and forth or oscillates is vibrating. A machine component may vibrate over large …
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Vibration sensing is only suitable for point measurement. The vibration switch working principle is based upon detecting the change in harmonic vibration frequency of the sensing element as a result of the presence of the target media. Working: The vibration switch consists of an oscillating or tuning fork which is made to resonate in the air. The …
AccelerometerAccelerometers are a piezo-electronic (crystal) device. A pre- loaded crystal is charged with current and as the crystal is compressed or de-compressed by vibration an output proportional to g’s (gravity) is provided. A “g” is equal to 9.80 meters/second2 or one (1) standard earth gravity. Accelerometers are normally used for high-frequency bearing cap vibration readings (Case/Bearing …