RU2604751C1 - Vibration-isolating support of vessel diesel power plant - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building. Vibration-isolating support includes an elastic element in the form of a steel rope wound along a spiral and fasteners. Turns of the elastic element are passed through cylindrical holes of support plates. Support body is made in the form of a parallelepiped. Elastic element is made in the form of one pair of series-connected elements. Between inner moving support plates there is a floating element of attachment of the support to the power plant leg. Upper outer support plate is attached to the upper shelf of the housing. Lower fixed support plate is attached on one side to the housing, and on the other side to the vessel foundation.

EFFECT: provided is improved stiffness characteristics of the vibration-isolating support.

1 cl, 5 dwg

Description

The invention relates to vibration-isolating supports of marine diesel power plants, and can also be used to protect against vibration, shock and shock of other objects of technology.

In addition to traditional rubber-metal vibration isolators (shock absorbers), cylindrical rope (cable) vibration isolators are also used as vibration isolating supports for marine diesel power plants (SDEU). Known cylindrical cable vibration isolator - RF patent No. 2185548, class. F16F 7/14.

The closest technical solution is the “Cylindrical rope vibration isolator” (CCV) - RF patent No. 2390668, cl. F16F 7/14 adopted as a prototype.

CCV contains an elastic element in the form of a steel rope, wound in a spiral, the first and second supporting monolithic or prefabricated plates with cylindrical holes, and through these holes the coils of the elastic element are passed.

Significant disadvantages of the known CCV are:

1. The compressive stiffness of the CCW (Fig. 1, the curve “ab”) is less than the tensile stiffness (Fig. 1, the “ac” curve), that is, the compressive and tensile stiffnesses are not the same - they differ (Minasyan AM Creation and development of reduction tools vibration activity of marine diesel generator sets. Abstract of dissertation for the degree of candidate of technical sciences. SPb. SPbGMTU. 2013. - 22 p.).

2. The instability in time of the characteristics of the CCW, that is, the drawdown under the influence of long-term static and vibration load, especially for SDEU.

The technical result of this invention is to improve the stiffness characteristics of the reference vibration isolators SDEU.

The specified technical result is achieved by the fact that the vibration-isolating support of the ship diesel power plant, containing an elastic element in the form of a steel rope, wound in a spiral, movable and fixed supporting monolithic or prefabricated plates with cylindrical holes, and through these holes are passed coils of the elastic element, fasteners, according to the invention, the support housing is made in the form of a parallelepiped, and the elastic rope element is made in the form of one pair of elements connected in series.

Between the internal - movable - support plates, a floating element for attaching the support to the foot of the power plant is installed.

One - the upper outer - the support plate is fixed to the upper hull shelf, and the other - the lower fixed - support plate is fixed on the other side to the lower hull shelf, and on the other side to the ship's foundation.

Under the influence of the static load from the weight of the SEED, the elastic rope elements of the lower CCV from the base (ship set, foundation) experience compression deformation, and the elastic rope elements of the upper CCV located before the floating element experience tensile deformation (see Figs. 1 and 2).

Since all the supporting elements of two CCVs are fixed to the corresponding fixed and movable elements of the vibration isolator, then under the action of an alternating vibrational load, two CCVs simultaneously work, simultaneously experiencing alternating deformations. When the disturbing force is directed downward, the elastic element of the lower CCW is compressed, and the elastic element of the upper CCW is stretched and, conversely, when the direction of the disturbing force is upward, the elastic element of the lower CCV is stretched, and the elastic element of the upper CCV is compressed.

This feature of simultaneous operation, but with the opposite character of the tested deformation of the elastic elements of the two CCWs, provides a combination of their compressive and tensile loading characteristics, and therefore, the high efficiency of the vibration-isolating support of the SDEU.

Steel ropes are designed for high tensile forces, therefore, the elastic rope element of the upper CCW is operable, including when straightening the turns of the rope. This feature prevents compression of the lower CCW beyond its design strain, which thus eliminates the tendency of the elastic rope element to permanent deformation and subsidence, contributing to an increase in the durability of the support as a whole.

The technical solution is illustrated by the drawings shown in FIG. 1-5.

In FIG. 1 shows loading schemes and load characteristics during compression and tension of a cylindrical rope vibration isolator.

In FIG. 2 shows a transverse arrangement of vibration isolating supports SDEU.

In FIG. 3 shows a transverse diagram of the vibration-isolating support SDEU.

In FIG. 4 shows a side view of an SDEU anti-vibration mount;

In FIG. 5 shows a typical load characteristic “force - deformation” of a vibration isolator.

The elastic connection of the power plant 1 with paws 2 to the ship set (foundation) 3 is carried out by vibration-isolating supports with a casing 4 in the form of a parallelepiped, inside of which there is a pair of sequentially connected cylindrical rope vibration isolators 5 (upper), 6 (lower) with supporting plates 7-10 and floating elements located between the inner supporting plates 8 and 9 of vibration isolators with fastening means 12-17 (Fig. 2-4). The floating element 11 is attached to the diesel foot 2 by means of a fastening means 16 (Fig. 2-4).

Vibration isolating support SDEU works as follows.

Under the influence of the static load from the weight of the SDEU 1, the elastic rope elements of the lower CCV 6 from the base 3 (ship set, foundation) experience compression deformation, and the elastic rope elements of the upper CCV 5 located in front of the floating element 11 experience tensile deformation (see Fig. 1 and 2).

Since all the supporting elements of the two CCVs are fixed to the corresponding fixed and movable elements of the vibration isolator, then under the action of an alternating vibrational load, two CCVs simultaneously work, simultaneously experiencing alternating deformations (Fig. 1). When the disturbing force is directed downward, the elastic element 6 of the lower CCV is compressed, and the elastic element of the upper CCV 5 is stretched, and, conversely, when the direction of the disturbing force is upward, the elastic element of the lower CCV 6 is stretched, and the elastic element of the upper CCV 5 is compressed.

This feature of simultaneous operation, but with the opposite character of the tested deformation of the elastic elements 5, 6 of two CCWs, provides a combination of their compressive and tensile loading characteristics, and therefore, the high efficiency of the vibration-isolating support of the SDEU.

Steel ropes are designed for high tensile forces, therefore, the elastic rope element of the upper 5 CCV is operable, including when straightening the turns of the rope. This feature prevents the compression strain of the lower 6 CCV beyond its design strain, which thus eliminates the tendency of the elastic rope element to permanent deformation and subsidence, contributing to an increase in the durability of the support as a whole.

The main properties of the vibration isolating support are characterized by two sections shown in FIG. 5. In the initial section (the “vibration” section - small displacements), the vibration-isolating supports of the SDEU have a sufficiently high rigidity. As the amplitude of the action increases, the rigidity of the support decreases, as a result of which its natural frequency decreases more and more. Under shock loading, the initial displacement is large (the “impact” section, Fig. 5); therefore, the rigidity of the support is small and due to significant deformation, energy is absorbed. When the compression stroke of the support reaches approximately 75% of its nominal height, the stiffness begins to increase again. However, by this moment the impact acceleration had already decreased and most of the impact energy was absorbed (dissipated). In contrast to the prototype of the proposed support, the dissipative characteristic is more uniform in the entire range of permissible deformations, which allows to effectively reduce the load to the required limits.

Oscillatory energy from the paw 2 of the SEDE is transmitted through the floating support element 11 (Fig. 3, 4) and the coils of the rope elastic elements 5, 6. Due to friction between the steel cores of the rope, the vibrational energy is dissipated and the transmission of forces decreases through the outer support plates 7, 10 and the housing 4 on the foundation (plot "vibration", Fig. 5).

The proposed support also provides the required protection in the event of accidental shocks and concussions from the ship foundation 3 (Fig. 2). Thus, given the above features of the vibration-isolating support SDEU, the technical solution is useful.

An analysis of well-known technical solutions in this field and related industries shows that there are no designs of vibration-isolating supports with the indicated features, advantages and distinctive features.

Claims (1)

Vibration isolating support of a marine diesel power plant, containing an elastic element in the form of a steel rope, wound in a spiral, movable and fixed supporting monolithic or prefabricated plates with cylindrical holes, and through these holes are passed coils of the elastic element, fixing means, characterized in that the support body is made in the form of a parallelepiped, and the elastic rope element is made in the form of one pair of elements connected in series, between the internal - movable - supporting plates installed a floating element is attached to fasten the support to the foot of the power plant, with one - upper outer - supporting plate fixed to the upper shelf of the box, and the other - lower fixed - supporting plate fixed on one side to the lower shelf of the hull, and on the other side to the ship's foundation .

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