FIELD: metrology.
SUBSTANCE: invention relates to metrology. In the stand for vibroacoustic testing of specimens of elastic and noise-absorbing elements that contains the base, onto which the bulkhead is fixed, as then oscillator of harmonic oscillations, the eccentric vibrator is used, which is located on the bulkhead, and on the bulkhead the rack for testing the natural frequencies of elastic elements of spring and disk vibration isolators of different lengths, of geometric parameters, as well as of different masses that are attached to the ends of these test elements, while the oscillations of the mass fixed on each elastic element are fixed by the displacement indicator. On the base and on the bulkhead, the vibration acceleration sensors are fixed, the signals from which are sent to the amplifier, then the oscilloscope, the magnetograph and the computer for processing the information received are installed, where the frequency meter and the phase meter are used in order to adjust the work of the stand, where in order to determine the natural frequencies of each of the vibration isolation systems under investigation, 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 increment. Combined noise-absorbing lining is made in the form of rigid and perforated walls, between which is the multilayer sound-absorbing element is located, which is made in the form of two layers: one of which, being adjacent to the rigid wall, is sound-absorbing, and the other, being adjacent to the perforated wall, is made with the perforation made of sound-reflecting material of complex profile, which consists of the uniformly distributed hollow tetrahedrons, while a material based on aluminum-containing alloys is used as a sound-reflecting material, followed by filling with titanium hydride or air with a density within 0.5…0.9 kg/m3 with the following strength properties: compressive strength within 5…10 MPa, bending strength within 10…20 MPa, for example, foam aluminum, or soundproofing plates based on the glass staple fiber of the "Shumostop" type at the material density of 60÷80 kg/m3, or the material based on a magnesia binder with reinforcing fiberglass or glass wool.
EFFECT: extended technological capabilities of testing facilities.
1 cl, 8 dwg
