Methods of vibration measurement, contact and non-contact methods

Fluctuations occurring during the use of equipment referred to as vibration. The impact on aggregates (easily damaged) and health personnel servicing these machines. The vibration is of different types, and varies by the origin and categories. In order to minimize its impact (fully from fluctuations not to get rid of) develop methods vibration measurements and standard requirements.

Methods vibration measurements can be contact and beskonechnyj, wired and wireless.

Similar methods include mechanical connection of the measuring device with the target unit. The most simple methods of vibration measurement are performed using the piezoelectric sensors. In the low frequency ranges and at high vibration amplitudes (relative, of course), such devices provide the ability to obtain high-precision measurements.

However the small mass and inertia of the controlled object, the sensor will affect vibrational in nature, which will lead to distortion of the signal. In this case method of measurement of vibration, referred to as open cavity. The essence method – measurement of parameters of microwave resonator, which will change under the influence

vibration the tested equipment. The resonator is equipped with one fixed spherical mirror and the second corresponding element, mechanically associated with the unit.

Check movements at low vibration amplitudes is performed by amplitude method:

· At the entrance to the circuit diagram of the resonator - change the output power;

· When you enable endpoint – change in the reflected power.

This method measurement of vibration requires constant power and high frequency stability excitation.

From stationary systems can be noted the system of vibration monitoring "PROTON-1000" and the new wireless system BALTECH VP-3800-Wi-Fi.

However, not always allowed connection of the sensor with the controlled object. So non-contact methods of measuring vibrations become more common. The advantages of noncontact methods is the low inertia and no effect on the study unit. These methods do not involve mechanical linkage the measuring device with the test equipment.

Base such methods is the sensing of the object waves (sound, electromagnetic). Classified 3 groups:

· Optical. Disadvantages - stringent requirements for temperature the object of research, its quality and the atmospheric condition;

· Ultrasonic. Cons – small resolution ability, dependence on atmospheric conditions, a strong attenuation in the air ultrasound;

· Radiowave. Cons – dependence on the atmospheric state and the execution of complex calibration, if you change equipment, or the distance to it.

From measuring devices, you can select portable devices series "VibroPoint", BALTECH VP-3405-2, BALTECH VP-3410, BALTECH VP-3450 or BALTECH VP-3470-Ex corresponding to the standard GOST ISO 10816.

The company BALTECH offers undergo training in the "Training center qualification and training specialists" to learn how to work with pastries and vibration analyzers (the analysers). The training is available not only in Astana, in lübeck (Germany) or St. Petersburg, but also in enterprise customer.