The water tank
(57) Abstract:Usage: for hydrodynamic testing of models of boats. The inventive swimming pool is decorated with collapsible equipment for education, together with the pool of hydrolock comprising a longitudinal partition, not adjacent to the end walls of the bowl and divide it into two parts wall, on which is mounted the pump unit equipped with diffusers. This partition is placed in one part of the bowl to create the thread. The bottom of hydrolock forms the channel of a stream in another part of the bowl, together with its wall and longitudinal partition. In the head part of hydrolock between its bottom and the bottom of the pool is installed transverse bulkhead to the flow direction over the bottom of hydrolock, with width equal to the width of its channel. 3 Il. The invention relates to the technology of shipbuilding and for the design of devices for hydrodynamic testing models of vessels (ships, boats, boats, ferries, floating bridges, and others).Known the water tank containing the bowl with wavemaker, pump installation and track with the tow truck.However, it has ssana.This is achieved by the fact that the pool is made with collapsible equipment for education, together with the pool of hydrolock comprising a longitudinal partition, not adjacent to the end walls of the bowl and divide it into two parts wall, on which is mounted the pump unit, which is equipped with diffusers. This partition is placed in one part of the bowl to create the thread. The bottom of hydrolock forms the channel of a stream in another part of the bowl, together with its wall and longitudinal partition. In the head part of hydrolock between its bottom and the bottom of the pool is installed transverse bulkhead to the flow direction over the bottom of hydrolock, with width equal to the width of his bed.In Fig. 1 shows the water tank, top view; Fig.2 section a-a in Fig.1; Fig.3 cross-section B-B in Fig.1.Offer the water tank contains a bowl with 1 by rail, tow truck 2, wavemaker 3 and collapsible equipment hydrolock including a longitudinal partition 4, the partition wall 5 is mounted in it, the pump unit 6 and the diffuser 7, the bottom 8 hydrolock, transverse partition 9. The longitudinal partition 4 does not cover the entire bowl in length, leaving prna partition 5 mounted in it, the pump unit 6 and the diffuser 7. In another part of the set plate 8 hydrolock, which forms together with the wall 10 of the Cup and longitudinal partition 4 channel hydrolock. For flow direction on top of the bottom 8 in the head part 11 hydrolock mounted transverse partition 9 between the bottom 12 of the Cup and the plate 8 hydrolock with width equal to the width of his bed.The flow of water in hydrolate is constructed as follows. The pump unit 6 through the diffuser 7 (output rectangular cross-section which fills the entire area between the longitudinal partition wall 4 and the wall of the bowl, the bottom 12 of the Cup and the water level) directs the flow into the head part 11 of hydrolock, where the flow around the end of the longitudinal walls 4, is directed in the opposite direction along hydrolock formed by the wall 10 of the Cup, a longitudinal partition wall 4 and the bottom 8 hydrolock. Changing the speed of the flow is accomplished by adjusting the frequency of rotation of the impellers of the pump unit 6. After passing flow in the direction of hydrolock it around a longitudinal partition 4 is returned to the pump installation. To reduce non-uniformity of flow and wave generation on the surface at the beginning of the channel hydrolock (before a work area) as in all known hydraulic channels receive can be set is the study of the produce (e.g., with the help of the crane gantry type moving over the rail of the pool) in the following order. Place the panels of the longitudinal walls 4, cementing them together and attach to the wall and the bottom of the bowl (with the appropriate seals). Regulate the position of the panels of the longitudinal walls 4, ensuring that it was parallel to the wall 10 of the pool, which is the second wall hydrolock. Install panel bottom 8 hydrolock. Install transverse partition 9 between the bottom 12 of the pool and the bottom 8 hydrolock. Tighten all fasteners connectors. Set on the sealing wall 5 with the pump unit 6 and the diffuser 7 and fix it to the bottom 12, the wall of the swimming pool shell and longitudinal bulkhead 4. Connect the pump unit 6 with the drive outside of the pool. The water tank containing a bowl of veleprodaja, pump installation and track with a towing carriage, characterized in that the pool is decorated with collapsible equipment for education, together with the pool of hydrolock comprising a longitudinal partition, not adjacent to the end walls of the Cup and divides it into two parts by a partition, kotorov one part of the bowl to create the thread and the bottom of hydrolock forming its bed in another part of the bowl together with its wall and the longitudinal bulkhead, in the head part of hydrolock between its bottom and the bottom of the pool is installed transverse bulkhead to the flow direction over the bottom of hydrolock, with width equal to the width of its channel.
FIELD: experimental hydromechanics; designing of equipment for conducting hydrodynamic and ice searches of marine engineering facility models in model testing basins.
SUBSTANCE: proposed device includes towing trolley with frame rigidly secured on it; this frame is provided with bar which is connected with model through dynamometers and bearing plate. Dynamometers form three-support force-measuring system; they are provided in each support in form of two interconnected elastic members; one elastic member is made in form of five-rod member provided with longitudinal and lateral force sensors; it is located between two flanges. Second elastic member of dynamometer is made in form of membrane-type elastic member whose membrane is located between rigid rim and rigid central part of this member provided with threaded rod with elastic hinge mounted over vertical axis perpendicularly relative to membrane. Membrane, rim and rigid central part with threaded rod and elastic hinge are made integral. Rim of membrane elastic members is rigidly connected with one of flanges of five-rod elastic member in such way that threaded rod is located along vertical axis of support and is rigidly connected via elastic hinge with bearing plate secured on model. Membrane is provided with resistance strain gages forming vertical force measuring bridge. Second flange of each five-rod member is connected with additional bearing plate secured on bar.
EFFECT: enhanced accuracy of measuring forces and moments.
FIELD: transport, auxiliary ship equipment.
SUBSTANCE: proposed test pool comprises the bottom simulation plant including submerged suspended support made up of assemblage of identical support sections arranged across the channel and distributed over its length. Aforesaid sections are suspended with adjusting tie-rods jointed to their length adjustment devices arranged on the channel walls sides. False bottom is mounted and rigidly attached to the said suspended support. The bottom simulation plant can vary the false bottom inclination towards horizontal plane in both the channel lengthwise direction α° till , and crosswise direction β° till , where L is the length of assembled bottom simulator, B is the bottom simulator width, HB is channel water depth, HD is the deepest bottom point, α° and β° are the angles of inclination of false bottom in lengthwise and crosswise directions, respectively. The total area of sections across the channel of support sections of the bottom simulator makes, at least, 0.05 of false bottom area in plan, while the false bottom width does not exceed 0.75 of the channel width. The false bottom is arranged in the channel symmetrically relative to the channel lengthwise axis.
EFFECT: higher efficiency of using ice test pool.
3 cl, 2 dwg
FIELD: testing equipment.
SUBSTANCE: invention is related to the field of shipbuilding, namely to technical means of experimental hydromechanics, and may be used for hydrodynamic tests of surface vessel model. Device comprises area of water with free surface, model of surface vessel towed by rope, motion of which is carried out through falling liquid weight that fills metering reservoir, which has holes both for reception and drain of liquid weight. Reservoir is fixed to axis of movable unit. Water to reservoir is sent through nozzle, which, together with elbow, crossbeam and bar creating bearing structure, and water pump, develop continuous water flow for reservoir filling. Fixed unit is attached to crossbeam, which produces polyspast together with unit. In process of tests performance, vessel model is positioned in the end of metering section of water area, and at the same time empty reservoir is lifted upwards. After contact with hole, reservoir after filling with liquid weight till rated level starts evenly lowering vertically down, providing for even horizontal motion of vessel model. The main result of experiment is time of weight lowering from unit down to support plate.
EFFECT: reduced cost of pool equipment, increased accuracy of performed measurements, reduced labour intensity of experiments performance.
3 cl, 1 dwg
SUBSTANCE: in trial tank, model, for instance platform is rigidly joined to dynamometre, which is fixed to base on tank board on the other side. Bottom imitator is installed under model and is rigidly suspended to base with the help of stands, which are located in stern part beyond model borders, ice field is frozen, which is then pushed up to model by means of towing trolley, and parametres of experiment are registered. Bottom imitator in its front part is fixed to base by means of stands, which pass through tested model. With the help of all these stands, clearance is adjusted and established between imitator and model, and tests are carried out. Device for realisation of such method in trial tank comprises towing trolley with bulldoser for ice pushing up to model, for instance platform, and rigid base fixed on tank board. Tested model is connected to it via dynamometre, as well as bottom imitator with the help of stands arranged in stern extreme end behind model. Imitator in front part has stands, which are joined to rigid base and pass through tested model of platform. It has wells arranged for specified stands. Stands have facilities for adjustment and installation of clearance between imitator of bottom and model, preferably lanyards, in process of tests performance.
EFFECT: invention makes it possible to improve reliability and accuracy of experiment results by provision of accurate positioning of imitator versus model.
2 cl, 1 dwg
FIELD: test engineering.
SUBSTANCE: invention refers to experimental studies in ice test pools and can be implemented for designing screw-steering complexes of vessels and facilities for their protection from ice by means of model experiment in pool under created conditions similar to natural. The procedure consists in preparing a field of model ice and in testing a model with operating propellers by means of towing the model or at its free motion at specified speed and at specified frequency of propeller rotation; testing consists in recording frequency of submerged ice cakes meeting a propeller-steering complex and other facilities external relative to the case of the model when ice protection of the model case is present or absent. Also density of model ice is measured. Further, the vessel model is towed in not destructed ice cover with turned off propellers and at speed determined by model-prototype relationship. There is measured average dimension of ice-cakes and width of channel behind the model formed at model passing through ice cover. Ice cover in not destructed ice field strip before the model, the width of which is equal to width of channel after the model, is cut into separate tightly adjoining blocks of ice. Dimensions of blocks are equal to measured average dimensions of ice cakes. The test is carried out in such made channel by means of towing the model with operating propellers. Notably, speed of model towing during the said test is less in comparison to model-prototype relationship speed determined with consideration of water and ice density. Frequency of propellers rotation is set to facilitate correspondence of speed of liquid in the stream behind the propeller to a value determined considering speed in the stream behind the propeller under natural conditions. During testing model under mode of free self-propelling rotation frequency of propellers is specified to ensure correspondence of speed of liquid in the stream behind the propellers under dockside mode to value determined with consideration of speed in the stream behind the propeller at dockside mode under natural conditions.
EFFECT: upgraded validity of test results by means of approaching them to natural conditions.
FIELD: testing equipment.
SUBSTANCE: invention is related to the field of experimental tests performance on models of ice breakers and ice ships in ice experimental pools. Method includes preparation of modeled ice field. Performance of model tests by means of its towing with a specified speed of vm. Registration of frequency of submerged ice debris ingress into propelling-steering complex, to ice boxes of ship model and to other external devices on model body with availability or absence of ice protection on model body. Density of modeled ice is identified as . In non-damaged ice cover they tow model of ship with a speed detected by ratio , where: νm and νf - speeds of model and full-sized vessels accordingly, λ is model scale. Average size of produced ice debris and channel width are measured behind model. In non-damaged ice field in front of vessel in width equal to width of channel behind model, ice cover is cut into separate adjacent ice floes. Size of ice floes equals measured average size of ice debris. Model towing in process of specified tests is carried out with speed ν'm, which is reduced in comparison with νm, which is identified by ratio ,
where: ρw - water density, - ice density required by technical task for performance of experiments.
EFFECT: provides for valid test results.
SUBSTANCE: method involves mounting a floating object model to the bottom of a tank through anchor connections and exposing the model to external wave effects and recording experiment parametres. The model under test is mounted to the bottom of the tank using two-branched flexible connection lines with which the model is movably joined through rollers freely hung to its housing. The paired branches of the flexible connection lines have different rigidity and the ends of the branches are attached to the base of the tank in points which are spaced apart. The device has truncated anchor connections through which the model under test is attached to the base of the tank. The anchor connections are in form of two-branched flexible connection lines between branches of which there are rollers mounted on the model, which are attached to its housing mainly on a flexible connection. The second branches of the flexible lines are also fitted with an elastic element, where the elastic elements of the paired branches of the flexible connection lines have different rigidity, and the other end of the branches of the said flexible lines is attached to the base of the tank at the corresponding point at a distance from the point of attachment of the first end.
EFFECT: approximation of simulated load in anchor connections to natural conditions.
3 cl, 2 dwg