Poster set-up for simulation of water flow towed body
(57) Abstract:Usage: relates to the field of water transport, in particular to the stand installations to simulate the flow of water towed body. Essence: poster installation contains hydrolock from bottom to accommodate the model of the towed body, consisting, for example, of separate elements, which are the models of sections of the towed body. The elements mounted on the two longitudinal guides, the ends of which are set using the slider can move along the vertical racks that are installed inside hydrolock. The fastening elements on the longitudinal guides performed using the brackets and screws. Racks are installed on the base, placed on the bottom of hydrolock. On top of the longitudinal wall of the hydraulic channels receive laid two cross bars, which are horizontal rod, oriented along the axis of hydrolock on the model of the towed body. Horizontal rod serves as an attachment point to which flexible connections attached model towed body fore and aft ends. In these flexible communications includes sensors that are part of the measuring apparatus. The base is provided with a panel, the panel is made of separate sections, pivotally connected to each other. The hinge axis perpendicular to the longitudinal axis of hydrolock and provided with clamps, and the base is equipped with lifting rings and ropes. 4 Il. The invention relates to water transport, in particular to the stand installations to simulate the flow of water towed body.Famous poster installation comprising hydrolock from bottom to accommodate the model of the towed body, a flexible connection with the attachment placed on the wall of hydrolock, measuring equipment, sensors which are installed on the flexible connectors.The lack of bench installation made in accordance with the prototype, is the inability to simulate the flow of water towed body at the variable soil profile, such a need arises in the study of pressure fields generated by a towed body with uneven ground with its slopes, hills, hollows, etc., this disadvantage reduces the functionality of the famous poster installation.The aim of the invention is to enhance the functionality poster setup by providing a simulation of water flow towed body profane wrap water towed body, containing hydrolock from bottom to accommodate the model of the towed body, a flexible connection with the attachment placed on the wall of hydrolock, measuring equipment, sensors which are installed on the flexible connections fitted with lateral guides for mounting the model, the ends of which are mounted for movement along the vertical racks that are installed inside hydrolock, and the flexible connection provided with connecting elements for attaching one end to a fore and aft ends of the model, and the other to mount, made in the form of a horizontal rod, oriented along the axis of hydrolock, equipped with installed on its bottom panel mounted on it with pressure sensors, and the panel is made up of sections connected to each other via a hinge, the axis of which is perpendicular to the longitudinal axis of hydrolock and provided with retainers.In Fig. 1 shows the experimental setup of Fig. 2 - the same, front view; Fig. 3 - section a-a in Fig. 1; Fig. 4 - section b-B in Fig. 2.Poster set-up for simulation of water flow towed body contains hydrolock 1 from bottom to accommodate the model of the towed body, compiled by the us in two longitudinal guides 7 and 8, the ends of which are set using the sliders 9 and 10 can move along the vertical columns 11-14 (hour 14 of the drawings not shown) installed inside hydrolock 1. Fastening elements 2-6 on the longitudinal guides 7 and 8 is made by means of brackets 15 and screws 16. Hours 11-14 established on the basis of 17 placed on the bottom of hydrolock 1. On top longitudinal wall hydrolock laid two cross bars 18 and 19, which are horizontal rod 20, oriented along the axis of hydrolock 1 on the model of the towed body. Horizontal rod 20 serves as a mount to which flexible connections 21 and 22 are attached model towed body fore and aft ends. In these flexible links included strain gauges 23 and 24 included in the measuring apparatus. The base 17 is equipped with a panel that hosts the sensors 25 pressure, such as a Pitot tube, the signals of which the tubes 26 are displayed on the indicators battery gauge 27, containing a series of vertically arranged tubes. The panel is made of separate sections 28-32, connected with hinges. The hinge axis perpendicular to the longitudinal axis of hydrolock 1 and provided with clamps, for example by nuts 33. Cos the key is as follows.On the basis of 17 establish racks 11-14, which put the sliders 9 and 10, enter the longitudinal guides 7 and 8 mounted items 2-6, one of its ends, a flexible connection 21 and 22 are connected with sensors 23 and 24, the other - to the horizontal rod 20. Length of flexible connections 21 and 22 determines the distance H from the axis of items 2-6 to the base 17, as the racks 11-14 sliders 9 and 10 are shifted down freely under the influence of gravity. This distance H is chosen from the condition of similarity so that the scale of the simulation match the distance towed body from the bottom of the reservoir. The distance between elements 2-6 install using staples 15 and screws 16. The panel is deformed in a desired way, why weaken tabs (nuts) 33 and install sections 28-32 at the required angles to each other, then tighten the nut 33. The base 17 mounted with its model of the towed body, the panel and measuring elements - sensors 25 and pressure tube 26 connecting the sensors with battery gauge 27, by means of cables 36 and 37 attached to the rings 34 and 35 are omitted in hydrolock 1. In hydrocode creates a flow of water, which, flowing a model of the towed body, creates panelu 23 and 24. These data allow taking into account the initial readings to determine the load on the model of the towed body and the indication of the battery gauge give the structure of this load on the elements. To determine the gravity of the towed body and its sections separately to the bottom of the reservoir, which recalculate the model results on the field. By varying the distance between the elements 2-6, form panel (angles of inclination of its sections 28-32), and the distance from the axis of items 2-6 to the base 17, it is possible to explore all possible options.It should be noted that before the experiment with each profile panel, it is necessary to measure the intensity of the field without the model of the towed body, and then to determine the change in the field due to the flow model of the towed body. POSTER set-up FOR SIMULATION of WATER FLOW TOWED BODY containing hydrolock from bottom to accommodate the model of the towed body, a flexible connection with the corner mounting, posted on the wall of hydrolock, measuring equipment, sensors which are installed on the flexible elements, wherein the plant is equipped with longitudinal guides for mounting the model, the ends of which are mounted with the possibility of connecting elements for attaching one end to a fore and aft ends of the model, and the other to said mount, made in the form of a horizontal rod, oriented along the axis of hydrolock equipped with installed on its bottom panel mounted on it with pressure sensors, and the panel is made up of sections connected to each other via a hinge, the axis of which is perpendicular to the longitudinal axis of hydrolock and provided with clamps.
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
SUBSTANCE: invention relates to ship building, namely, to safe operation of, mainly, gliding ships in shallow waters. Proposed method consists in optimising hydrodynamic characteristics of small-scale towed dynamically similar ship model in test pool in shallow depth prepared by using submerged screen and measuring model motion parameters. When model moves from deep water to shallow water, variations in draft and pitch angle are measured. This allows using experimental and computation procedures to define character of variations in position model hull bottom point at speed and at known tolerable depth for ship in shallow water and to evaluate ranges of safe speeds that make one of the basic elements in instructions for ships control in coastal navigation at water edges and in shallow waters.
EFFECT: possibility to define safe speed of ship model in move from deep water to shallow water.
FIELD: test equipment.
SUBSTANCE: invention refers to experimental flow dynamics of sea transport and deals with creation of laboratories for investigations of ice properties of ships. Ice experimental tank includes bowl with boards, handling dolly with equipment for water jets spraying at freezing of simulated ice cover. Outside the tank bowl parallel to one of its longitudinal boards there routed is a channel with the depth of not less than 0.5 m, which is interconnected with the bowl cavity via a pipeline. Perforated air supply tube to the channel is located at the channel bottom. Handling dolly is equipped with suction hydraulic pump for water supply to water jets spraying equipment, which is equipped with a connection pipe the receiving end of which is lowered into the above channel to the depth of not less than the half of its depth. Connection pipe of hydraulic pump is equipped with a rigid protective casing enclosing its housing and located so that it crosses free water surface in the channel and deepened with its lower end to the value of not less than 0.5 of the channel depth.
EFFECT: providing uninterrupted preparation of simulated ice for conducting the tests of ships models and engineering structures.
2 cl, 2 dwg
SUBSTANCE: invention relates to ship repair, particularly, to straightening of ship hull knuckle. Proposed method comprises measuring ship draught by all deadweight scales for ship fully loaded and empty. Results obtained allow calculating residual knuckle of the ship. Ship upper element cutting line is traced. Ship is placed in dock on dock floor to measure hull knuckle. Not here that hull center gives under gravity to reduce knuckle and eliminate clearances in supports pressed loosely to hull. Ship upper elements are cut along traced line. Cut edges at compressive stress converge. After convergence said edges are fitted in and welded together. Ship is launched and residual knuckle is measured to be eliminated, is required, by repetition of above jobs.
EFFECT: increased dead weight.