Patent Application
20140061422
This invention concerns a shock-filtering set-point resilient supporting system, intended, in particular, for equipment suspension on board a vessel.
Generally, a set-point resilient support, in particular for suspending devices or material on ships is known from the prior art from document FR A 2 559 863.
Such a support includes a U-shaped support element in resilient material, one branch of which is affixed to the support structure such as the ship and the other supports the device or material, whereby both branches are rigidified by a spacer extending between them, formed by a fracturable rod on a plane substantially parallel to the branches of the U and connected to both branches, with the connection to at least one of the branches being provided by a second fracturable element in the direction of the rod.
However, such a support is not suited for certain specific applications due to particular constraints.
Thus, for example, this type of support is not suited to receive certain materials, such as missile launching containers such as those chosen from the range of containers having the brand name SYLVER® of the applicant.
The/each launching container is received in one or more corresponding shafts of the ship such that their upper part is flush with the ship's bridge and their lower part is rigidly affixed to the bottom of the shaft, and thus to the structure of the ship.
However, this has a number of disadvantages, in particular with regard to the protection of the missiles, or, generally, the munitions in the/each container, as the shocks experienced by the ship are fully transmitted to the munitions stored in the containers.
This is the case, e.g., in the event of underwater explosions that may result in shocks of several dozen g in the ship's structure, which the known art resilient support cannot absorb.
Furthermore, this support also does not ensure that the container will be kept in the proper firing position.
The aim of this invention is thus to solve these problems.
To this end, the invention concerns a shock-filtering set-point elastic supporting system, intended, in particular, for equipment suspension on board a vessel, characterised in that it includes a load-bearing base connected with a support base of the vessel via set-point damping means comprising at least one damping assembly with metallic windings connected to pretensioned strips with set breaking points between the two bases.
According to other characteristics, taken individually or in combination:
The invention will be better understood based on the following description, provided by way of example only, referring to the attached drawings, in which:
In the exemplary embodiment shown, the container and the shaft have vertical axes, whereby the upper part of the container is, e.g., flush with the bridge of the ship and equipped with a shutter designated by general reference 4, which can be retracted when a missile is fired.
As is also shown, classically, these missiles are received, e.g., in the container 1 with their holes or protection camps, one of which is designated, e.g., by general reference 5. In fact, as shown in these drawings, the launching container 1 is received with a controlled axial and lateral deviation in the shaft, and the lateral wall of the container is equipped on its upper part with means of centring/guidance in the shaft, consisting, e.g., of stops in shock-absorbing material, one of which can be seen in the drawings and is designated by general reference 6.
These stops in shock-absorbing material are then, e.g., arranged between the container and the corresponding wall of the shaft to centre and guide, e.g., the top part of the container in the shaft.
On its lower part, the container is connected with and rests on damping means designated by general reference 7 in
These damping means are described in greater detail in
As shown, these damping means comprise at least one damping assembly with metal windings, and, in the example shown, at least two damping assemblies with metal windings, arranged symmetrically on either side of the container and designated by general references 11 and 12 in these drawings.
In fact, the damping assemblies with metal windings are in the form of at least one coil spring organ arranged lying flat between the bases, with its opposite edges engaged in openings for corresponding connection lugs of the bases, e.g., lugs 13, 14, 15, and 16 shown in these drawings.
These damping means also include pretensioned set-point breaking pins mounted between the two bases, two of which, 17, 18 respectively, are shown in these drawings.
One of these breaking pins 18 is shown in greater detail in
This break strip includes two portions, 19, 20, connected by a frangible pin 21, each end of which is connected to a base.
Thus, for example, each strip includes a male portion, designated by general reference 20, with one end suited to engage with a screed 22 on one end of a corresponding female portion 19 of the strip, whereby the frangible pin 21 extends transversely into the screed 22 of the female portion 19 and through the male portion of the strip 20.
As also shown in
In the exemplary embodiment shown, both ends of each strip are threaded, and each is suited to engage with an opening in a bracket and to operate in tandem with a corresponding nut.
It will further be noted that each nut has a spherical support range 29, 30 suited to operate in tandem with an additional support surface of the corresponding bracket 25, 26.
The set-point damping means may include several related set-point break strips.
Thus, for example, at least two related set-point break strips, mounted head-to-tail between the bases, may be provided.
These are advantageously inclined in the direction of the axis 5 of the container 1, as seen in the drawings.
In fact, and according to the embodiment shown, the damping means may include two sets of two strips arranged symmetrically on either side of the container.
Thus, in the example shown, the container has a rectangular section, and two damping assemblies with metal windings are arranged symmetrically on two sides of the container, whilst two sets of two strips are symmetrically arranged on the two other sides of the container.
Such a structure allows, based, e.g., on an input shock of 30 g vertically or 15 g transversely, for absorption of the shock energy to obtain a maximum of 10 g on the on-board munitions, with a munitions load variable from 1-4 munitions, i.e., a range of the mass of munitions of 150-600 kg, a dissymetrical munitions load, or taking into account the force related to the launching of a missile (35 KN, dissymetrical, to the launcher), knowing that, under normal operating conditions (initial firing of the missile, platform movement, etc.) the axes of the launching cells must maintain positional fidelity on the order of 1.5 mrad.
Thus, a damping assembly with a tripping threshold is integrated into the fixation of the container/launcher on the vessel.
In normal operating conditions, the launcher maintains its rigidity characteristics to meet the requirements of alignment of the missiles, and in case of shocks related, e.g., to underwater explosions, the dampers are tripped at the calibrated values.
This limits accelerations of the munitions in order to preserve them.
As noted above, the strips are mounted with pretension at the level of the damping means.
In these conditions, the strips are extended, and withstand the forces generated by the crushing of the shock absorbers.
In the event of a shock related, e.g., to an underwater explosion, the upward activation of the launcher causes additional crushing of the windings.
In this moment, the strips are no longer under tension. It is the kickback when the strips return to their place that the frangible strips break.
Then, the shock absorbers take over to protection the munitions.
In the event of a transverse shock, the forces applied to the launcher cause coupling at the level of the strips. The two strips, operating in compression, are broken upon the first crash pulse, and the two others are broken upon the first kickback.
The shock absorbers then take over to filter the accelerations and preserve the munitions.
This principle allows the accelerations of the vertical shock to be divided by two, i.e., 15 g.
It should be noted that, following a shock from an underwater explosion, when the strips are broken, it is possible to reconfigure the installation so that the launcher returns to nominal capacity by simply replacing the strips.
It thus assumed during the calculations for the sizing of the launcher that the damping means with a tripping threshold will limit the constraints.
This allows not only for general reduction of the mechanical resistance of the launcher, but also for a reduction of the forces on the vessel and munitions interfaces.
Of course, other embodiments are also possible.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1154069 | May 2011 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP12/58530 | 5/9/2012 | WO | 00 | 11/11/2013 |
