SU593033A2 - Ship foundation with vibration damping mass - Google Patents

Description

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The invention relates to the field of general engineering and concerns the design of foundations that prevent the propagation of sound waves, such as occur during the operation of shipboard mechanisms.

The installation of vibration-proof masses in the way of propagation of sound waves in the construction of vibration-proof foundations for ship support mechanisms 1 is known.

The vibration-retaining mass is made in the form of a thickened strip, which is installed in the node connecting the non-limb with the deck. The masses are welded into vertical plates directly at the joints of the flooring.

The disadvantage of this arrangement is that stress concentrations arise in the structure.

Also known is the design of the shipboard foundation with a vibrating mass, built directly into the foundation joints according to ed. St. No. 484118. The anti-vibration mass is located above the joint with the deck flooring. The installation of vibration-proof masses, i.e. bodies having a much greater moment of inertia and mass than the vibrating plates of the ship's foundation, prevents the propagation of sound vibrations.

However, the known construction does not provide a sufficient vibration insulating effect in the required frequency range, and it is also difficult for the monitor.

To improve the vibration-insulating properties and simplify the installation of the foundation in the proposed device, the thickness of the wall sections between the vibrating mass and supporting shelves is from 0.3 to 0.4 thicknesses of the supporting shelves, and at the intersections and joints the vibrating masses are installed with connectors.

FIG. 1 shows the described device, a longitudinal section; in fig. 2 - the same cross section.

The device contains vibrating mass 1, built directly into the wall 2, and vertical braquet 3. Mass 1

located above the joint of the floor of the bottom 4 with walls 2 and brackets 3. Walls 2 and brakes 3 with the upper edges are rigidly fastened to the support shelves 5. Connectors 6 are provided at the intersections of the vibro-spinning masses 1 and the vertical joints 3.

Vibration-retaining masses 1 are set above the flooring of the bottom 4 by the value A, / 4, where A is the wavelength corresponding to the given highest frequency of the vibration-isolating effect.

This prevents the development of sound vibration in the wall sections that are enclosed between the mash-holding masses 1 and the flooring of the second floor 4.

Making the wall sections 2 enclosed between vibrating mass 1 and supporting shelves 5, with a thickness equal to 0.3-0.4 of the thickness of supporting shelves 5, makes it possible to obtain an optimum from the point of view of the passage of Flexural vibrations.

Taking into account the large extent and width of the foundations for the main and large auxiliary mechanisms, the presence of connectors 6 at the points of intersection and docking of the vibration-holding masses 1 removes labor-intensiveness and simplifies the technology of manufacturing and installation of foundations, as there is no need for such operations as the vibration-sensitive in order to make them perish, repeating the contour of the inner

of the bottom, and welding of water-holding masses on the entire thickness of the section in the places of their joining with subsequent control of the quality of the welds.

Claims (1)

1. USSR author's certificate No. 175836, cl. B 63B 3/56, 1963.