The vibration device

 

The invention relates to vibroacoustic and solves the problem of increasing vibroplasty in the construction of the ship and engineering applications. Vibration-absorbing device made in the form of protected and attached plates arranged in parallel with a gap filled with a viscous fluid, in which evenly spaced around the square are pliable elements. These elements bind the said plate and performed mainly in the form of a closed rubber shell filled with air. The size of pliable elements is 0.10.5 volume of space with the liquid between the plates. The technical result is an increase in vibration damping effect, especially at low frequencies, as well as increasing the strength of the connection plates in the device. 2 Il.

The invention relates to the field of vibration in mechanical engineering and shipbuilding, and can be used to reduce vibration and noise.

From literature is known for such funds vibroplasty as a puff of vibration-absorbing material consisting of two metal plates connected viscoelastic adhesive layer, small compared to the plate thickness. (A. C. of Neoist is insufficient bearing capacity of the structure.

Closest to the proposed technical solution to the technical essence and the achieved effect (prototype) is a device consisting of two plates with a gap filled with a viscous fluid (Fibropenobetona structure, U.S. patent 3087568, CL 181-33, 1959). However, the known device has insufficient vibration-absorbing effect, especially at low frequencies. In addition, the mounting plates to each other without reducing the effect represents a technical challenge.

The present invention is to increase vibration damping effect, especially at low frequencies, as well as increasing the strength of the connection plates in the device.

This is achieved by the fact that in space with viscous fluid evenly across the area of the plates placed pliable elements, performed mainly in the form of a closed rubber shell filled with air. The size of pliable elements is 0.10.5 volume of space with the liquid between the plates. Pliable elements bonded to the inner surfaces of the plates, which results in increased strength of the device. Placement of elastic elements in the space between plastinarium, where in Fig.1 shows a schematic depiction of vibration damping device of Fig.2 - experimentally obtained frequency dependence of the vibrational speed of one of the variants of the device near the low-frequency resonance of the structure.

The proposed vibration-absorbing device (Fig.1) is secured to plate 1 attached to it through the viscous fluid 3 plate 2 and uniformly on the square is placed between the plates pliable elements 4. Pliable elements 4 can be made from a material with a small value of bulk modulus, for example of cork, but the best results are vozduhonosnye rubber shell, which must be secured to the plates 1 and 2.

The device operates as follows. Under the action of dynamic forces developed in the protective plate 1, in a viscous fluid formed shear and transverse with respect to the plate wave. Total loss factor designin determining its vibration-absorbing efficiency, is the sum of the loss factor due to sheartand transverse wavesP. (A. S. Nikiforov. Vibraphone on ships. Sudostroenie, Leningrad, 1979, page 73). The appearance of the normal to the surface of the plate 1 waves due to the presence of podatlivosti 4, which, together with the inertia viscous fluid, create an environment with a relatively low speed of the waves, making it possible to realize the mechanism of "soft" vibroplasty (ibid p 65) with a high loss factorP. In addition, the pliable elements, spaced evenly around the square, fasten the plates 1, 2 without forming hard "bridges" for vibrations, transferring the energy to the annexed plate, reducing the acoustic effect of the design.

The choice of the volume of space filled with pliable elements, is defined as. Reducing this amount against the named leads to unacceptable increase in the speed of transverse waves and, therefore, reduce the effectiveness of the device as a "soft" coating. Increase this amount against the named leads to a decrease in the concentration of a viscous fluid and reduces the efficiency of the absorption mechanism is due to shear waves.

Was the experimental verification of the efficiency of the device, which was measured yielding a concentration of 0.4, surrounded by a viscous fluid in the form of unpolymerized epoxy resin. The loss factor of the device was calculated by the width of the resonance curve 5 2f and the resonance frequency fpand was= 0,26 (Fig.2), which is a quite high value.

Claims

The vibration device representing the protected plate and installed in parallel with a gap of attached plate, the space between which is filled with viscous fluid, characterized in that in the space with viscous fluid evenly across the area of the plates placed pliable elements connecting the inner side of the mentioned plates and performed mainly in the form of a closed rubber shell filled with air, and the volume occupied by the pliable elements is 0.10.5 volume of space with the liquid between the plates.

 

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