Non-ribbed hydroacoustic station antenna dome

IPC classes for russian patent Non-ribbed hydroacoustic station antenna dome (RU 2510923):

H01Q1/42 - Housings not intimately mechanically associated with radiating elements, e.g. radome

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Non-ribbed hydroacoustic station antenna dome / 2461925

Non-ribbed hydroacoustic station antenna dome, having the shape of a hydrodynamically streamlined body which is supported by excess internal pressure and a unit for attaching to the vessel hull in form of an edge of a fairing plate, located in a metal clamp, according to the invention, the fairing plate is reinforced with a polyaramid fabric and contains binder in form of an elastomer. The unit for attaching to the vessel hull is in form of two parallel metal plates, which enclose between themselves an area of the fairing plate, made from polyaramid fabric in form of reinforcing material and epoxy binder, and an area of the transition zone to the rest of the part of the fairing shell in which there is gradual smooth replacement of the epoxy binder by the elastomer binder. Polyurethane is also used as the elastomer binder.

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/ 2292101

FIELD: physics, acoustics.

SUBSTANCE: invention relates to shipbuilding and specifically to hydroacoustic station domes. The non-ribbed hydroacoustic station antenna dome consists of an outer layer, an inner layer and a middle layer in between, said layers being made of polymer composite materials, and is characterised by that the middle layer is reinforced with polyaramid fibres, and the outer and inner layers are reinforced with waterproof fibres, wherein the total thickness of the outer and inner layers is not more than 0.25 times the thickness of the middle layer.

EFFECT: making a hydroacoustic station antenna dome from composite materials, having high strength and operational reliability with improved acoustic properties.

3 cl, 3 dwg

The invention relates to the field of shipbuilding, namely the fairings antennas hydroacoustic stations, and concerns the question of the construction of the Radome hydroacoustic station.

Fairing hydroacoustic station, which is part of the working compartment (partitions) with mount antenna hydroacoustic station has bezzabotnuju three-layer composite siding. The enclosure occupies the space from the bow of the boat to the transverse bulkhead. The fairing should create favorable conditions for the work of hydroacoustic station.

Known podolny fairing hydroacoustic station surface ship containing the planking and working set (instrumental) compartment, separated by transverse bulkhead from the neighboring compartment (Prostakov A.L. Hydroacoustic equipment fleet. Moscow, Wienges, 1974, 5). However, the set of fairing is located in the working area, which reduces its zvukoprovodnosti and immunity.

Known podolny fairing hydroacoustic station surface ship containing transverse bulkhead working compartment and a keel beam (set), on which is mounted Bethabara trim fairing, as well as a Foundation under the antenna hydroacoustic station (USSR Author's certificate No. 999404, CL B63B 17/00).

He has the required acoustic properties, but the ri location fairing in the fore part of the ship the integrity of the shell fairing may be compromised due to excessive movement of the keel support beam cantilever type, which experiences a large vertical load from slaming. To address the question required a substantial increase in the rigidity of the structure, which support shell fairing.

Known podolny fairing hydroacoustic station surface ship containing transverse bulkhead working compartment, the keel beam (set), a Foundation under the antenna hydroacoustic station, bezzabotnuju fiberglass shell and stanchions to increase the rigidity of the structure on the force in the vertical direction (Patent for invention №2265549). This fairing has to meet the requirements of the acoustic properties only for surface ships.

Known berberie fairings for surface ships and submarines manufactured by the company Goodrich (Goodrich).

http://www.goodrich.com/portal/site/grcom?GUD=6bf7e3f0930da110VgnVCM10000068f57eaa RCRD. Cowling design for NC this company is a shell of rubber reinforced with steel wire. To maintain the shape of such fairings requires constant internal excess pressure of the water.

Known also Radome hydroacoustic station submarine sandwich structure made of fiberglass, made of polymer composite materials (Achthoven, Vagolytic, Vchrmenu, Liskiewicz, "So the ity and stability of fiberglass fairings antennas hydroacoustic stations, containing joints, under operational impacts". Proceedings of the CRI them. Acad. Krylov shipbuilding, issue 35(319), St. Petersburg, 2008, 1, 2) prototype.

However, operational impacts on these fairings there is a significant stress concentration at the boundary layer, the presence of which is due to a large difference in mechanical characteristics of the joined layers. Adverse stress state creates a lowered adhesive strength and low impact resistance of the fairing, as evidenced by numerous cases of damage to the fairings.

Object of the present invention is to provide a Radome hydroacoustic station from composite materials having high strength and impact resistance with superior acoustic properties.

This is achieved by the fact that bezrobotnego of Radome hydroacoustic station, consisting of outer, inner layers and located between the middle layer, made of polymer composite materials according to the invention it is the middle layer is reinforced with fibers, polyaramid threads, and the outer and inner layers reinforced with water-resistant fibers. Thus the total thickness of the latter is not more than 0.25 thickness of the middle layer.

In addition, as water-resistant fibers naruino and inner layers of the Radome can be used glass fiber.

Along with these as water-resistant fibers of the outer and inner layers of the Radome can be used carbon fiber.

Reinforcing middle layer polyaramid threads fibers having high strength and low density, can increase the resistance and to improve the acoustic properties bezrobotnego of Radome hydroacoustic station.

The reinforcement of the outer and inner layers bezrobotnego of Radome hydroacoustic station water-resistant fibers allows you to save the strength of the middle layer on the period of operation, since the proposed material - polyaramid when necessary strength itself does not have the necessary resistance.

Limiting the total thickness of the outer and inner layers bezrobotnego fairing hydroacoustic station value not greater than 0.25 thickness of the middle layer allows to reduce the linear mass of the product and thereby improve the acoustic properties of the Radome.

The advantage of the new device bezrobotnego of Radome hydroacoustic station is its increased strength and impact resistance, which are provided by the proximity of the elastic and strength characteristics of the materials being joined layers.

The invention is illustrated by drawings, where figure 1 presents a General view of the con the cluster fairing hydroacoustic station, figure 2 is a fragment of the Radome hydroacoustic station prototype and figure 3 is a fragment of the proposed bezrobotnego of Radome hydroacoustic station.

Bearberry the Radome hydroacoustic station consists of an inner layer 1, the outer layer 2 and located between the middle layer 3, made of polymer composite materials (figure 3). The middle layer 3 is reinforced with fibers, polyaramid threads (not shown)and the outer layer 2 and inner layer 1 is water-resistant fibers (not shown). Thus the total thickness of the outer 2 and inner 1 layers is not more than 0.25 thickness of the middle layer 3. In addition, as water-resistant fibers of the outer layer 2 and inner layer 1 can be used glass fiber or carbon fiber.

The device operates as follows. Under the action of external loads by flow of water occurs, the joint deformation of all three layers 1, 2, 3 bezrobotnego of Radome hydroacoustic station. Polyaramid in the middle layer 3 reduces the concentration of shear stresses at the boundaries of layers in pairs: "outdoor 2 - medium 3" and "internal 1 - medium 3". Reducing stress concentration increases strength and shock fairing.

Offer bearberry the Radome guide is akusticheskii station has higher strength and resistance to impact and improved acoustic characteristics, that it distinguishes from the prototype.

1. Bearberry the Radome hydroacoustic station, consisting of outer, inner layers and located between the middle layer, made of polymer composite materials, characterized in that the middle layer of fairing reinforced fibers, polyaramid threads, and the outer and inner layers reinforced with water-resistant fibers, while the total thickness of the outer and inner layers is not more than 0.25 thickness of the middle layer.

2. Bearberry the Radome hydroacoustic station according to claim 1, characterized in that as water-resistant fibers of the outer and inner layers of the Radome used glass fiber.

3. Bearberry the Radome hydroacoustic station according to claim 1, characterized in that as water-resistant fibers of the outer and inner layers of the Radome used carbon fiber.