FIELD: metrology.
SUBSTANCE: invention relates to metrology. Stand contains a base on which, through at least three vibration isolators, a partition is fixed, which is a single-mass oscillatory system, and as a generator of harmonic oscillations, an eccentric vibrator is used. There is a rack with tested elements attached to it on the partition. Oscillations of the mass fixed on each elastic element are fixed by the displacement indicator. There are the vibration acceleration sensors fixed on the base and the partition. Signals from the sensors are sent to the amplifier, then to the oscilloscope, the magnetograph and the computer for processing the information obtained. To adjust the work of the stand, a frequency meter and a phase meter are used, where in order to determine the natural frequencies of each of the tested vibration isolation systems, the shock pulse loads on each of the systems are imitated and oscillograms of free oscillations are recorded, the decoding of which determines the natural frequencies of the vibration isolation systems and the logarithmic decrement of oscillation damping. Sound power level is determined from the results of measurements of the average sound pressure level on the measuring surface, which is the area of the hemisphere. Then, the magnitude of the decrease in the sound pressure level in the reflected sound field of the sample of the combined noise-absorbing liner with resonant elements is calculated. Sample contains a smooth and a perforated surfaces, a vibration isolation material consisting of areas with cavities filled with foam. Sample also contains resonant plates with resonant inserts.
EFFECT: expansion of technological possibilities of testing of vibration isolators.
1 cl, 7 dwg
