CN107478406A - A kind of dismantled and assembled rocking plate type wave making system that can be applied to low temperature towing ice model tank - Google Patents
A kind of dismantled and assembled rocking plate type wave making system that can be applied to low temperature towing ice model tank Download PDFInfo
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- CN107478406A CN107478406A CN201710615689.2A CN201710615689A CN107478406A CN 107478406 A CN107478406 A CN 107478406A CN 201710615689 A CN201710615689 A CN 201710615689A CN 107478406 A CN107478406 A CN 107478406A
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- 229910000831 Steel Inorganic materials 0.000 claims description 37
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- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000012938 design process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The present invention relates to a kind of dismantled and assembled rocking plate type wave making system that can be applied to low temperature towing ice model tank, including at least one wave maker, vertical support, horizontal stand, track support base and track.Each wave maker includes rocker, balance staff, servo drive system, seal box, bottom of pond basis steelframe；Servo drive system is placed in seal box, and two rocker balance staffs are connected by shaft coupling with the output shaft of double shaft-protruding type reductors respectively；Rocker balance staff stretches out seal box through dynamic sealing interface, is connected with the bearing being fixed on basic steelframe, and servo drive system drives rocker to swing by balance staff.It is fixedly connected between the bottom of pond basis steelframe of adjacent wave maker, it is ensured that the concentricity of each wave maker balance staff；Both sides are respectively fixedly connected with vertical support close to the basic steelframe of the wave maker of ice model tank pool wall position, are respectively fixed with track and track support base on both sides ice model tank pool wall top, vertical support is connected to track support base by horizontal stand.
Description
Technical Field
The invention relates to a detachable rocker plate type wave generator which can be applied to a low-temperature towing ice water tank.
Background
With global warming, ice covers in the two-polar region are gradually ablated, and the development of natural resources in the polar region with ice sea areas and the opening of channels in the ice regions become hot spots concerned by all countries in the world. In order to ensure the safety of human production and navigation activities in the ice region, the characteristics of the marine environment in the ice region and the effect of the marine environment on marine engineering structures must be accurately grasped. Sea ice is a unique environmental factor in the sea area of the cold region and is an important component of the marine environment of the cold region, and ice load also often becomes control load on marine engineering structures in the cold region. Meanwhile, the waves are important power factors in the marine environment and are main power for shaping the sea ice form in the ice edge area, and the wave force is an important environmental load on the marine engineering structure. In order to accurately consider the environmental load in the design process of the ocean engineering structure in the cold region and effectively evaluate the performances of rapidity, navigability, maneuverability and the like of the sailing ship in the ice region, research on the interaction of ice-waves and the structure is required to be carried out. Because the physical process is very complex, the constitutive relation of the sea ice material is not completely disclosed, and the problem is very difficult to research by theoretical analysis and numerical simulation methods. Meanwhile, because the physical process is influenced by a plurality of environmental factors and the real sea state is complicated and changeable, the problem is difficult to systematically research by a field observation method. Therefore, developing an indoor physical model test is an effective method for studying the progress of the interaction.
To develop an ice-wave interaction model test with a structure, it is necessary to simulate sea ice and waves simultaneously during the test. Among them, the ice engineering model test is generally required to be performed in a low-temperature towing ice water tank, and the wave model test is generally performed in a wave water tank. The key equipment for simulating waves in the wave water tank is a wave generator, and common wave generators can be divided into push plate type, rocking plate type, flush box type, air type and the like according to different wave generating principles. The push plate type wave making machine drives a vertical flat plate to do piston type reciprocating motion at one end of the water tank through a servo system, so that water surface fluctuation is caused to generate waves, and the wave height and the period of the generated waves are determined by the stroke and the reciprocating motion frequency of the push plate respectively. The rocking plate type wave generator drives a rocking plate to reciprocate around a bottom rotating shaft through a servo system, so that the water surface is disturbed to generate waves, and the wave height and the wave period of the generated waves are respectively determined by the amplitude of oscillation and the frequency of oscillation of the rocking plate. The box-type wave generator generates waves by a box body which vibrates vertically on the water surface, the shape of the box body is a designed special column shape, and the wave height and the wave period of the generated waves are determined by the stroke and the frequency of the box body. The air type wave generator is characterized in that one section of area is closed at one end of a water tank, the water surface is fluctuated by adjusting air pressure in a sealed box body, so that waves are generated, and wave generation parameters can be changed by adjusting a valve in the sealed box body and controlling the change amplitude and frequency of the air pressure. The actions of various wave generators are usually controlled by a servo motor or a hydraulic servo system, and various regular waves meeting the requirements of wave parameters and random waves meeting the set wave spectrum conditions can be generated by setting the motion time course of the wave generators. Through the adjustment and design of the structural style of the wave generator, the simulation of wave propagation and superposition of different wave directions can be realized, such as a snake-shaped wave generator commonly used in a ship towing tank.
In order to accurately simulate the interaction process of ice-wave and structure, the ice model test condition and the wave test condition are combined, namely the low-temperature towing ice water tank with the wave making capability is provided. At present, various wave generators are applied to a normal water wave water tank, and the reconstruction of the normal water wave water tank into a low-temperature towing ice water tank undoubtedly faces huge technical and economic difficulties and obviously has no practical feasibility. The technical difficulty of additionally installing the wave generator in the existing low-temperature towing ice water tank is lower, the investment cost is lower, and the method is a feasible solution. The wave making machine designed and manufactured to be suitable for the ice water tank mainly faces the following technical problems:
● the ambient temperature in the low temperature laboratory where the ice water pool is located is lower, and the servo system can have the phenomenon of power attenuation under the low temperature environment, even can not run or be damaged.
● the water surface of the ice water pool is covered with model ice, and the working object of the wave making machine is ice-water mixture. Although the wave making machine can clean the model ice in the wave making area when working, the wave making machine wave making component can still be inevitably contacted with an ice-water mixture, and higher requirements are put forward on the structural strength, rigidity and driving capability of the wave making machine.
● due to the low temperature environment and ice loading, the ice water pool wave maker will increase in volume, resulting in more occupied valuable ice water pool test area. Meanwhile, the manufacturing cost of the wave generator is also increased by the more severe design parameter requirements.
With the continuous deepening of polar region resource development and space development and the increasing demand for forecasting the marine environment characteristics of ice edge regions around polar regions, a large amount of basic model test work needs to be developed to research the ice-wave and the interaction process of the ice-wave and the structure. The number of low-temperature towing ice pools which are operated worldwide is small, and the low-temperature towing ice pools with wave-making capability are rare. The newly-built low-temperature towing ice water pool has huge investment and long construction period, and the wave making machine is installed in the existing ice water pool to become an effective method for relieving the contradiction between the workload of the model test and the capability of basic equipment in a laboratory. However, the existing wave generator devices are not suitable for being directly installed in the ice water pool due to the above technical problems, and therefore, it is necessary to develop a wave generator which can be applied to a low-temperature towing ice water pool.
Disclosure of Invention
The invention aims to overcome the technical defect that the conventional normal water wave generator is not suitable for an ice water pool, and provides the wave generator which can be applied to a low-temperature towing ice water pool by combining the environmental conditions and the technical requirements of the low-temperature towing ice water pool. The detachable ice water pool not only can adapt to the environmental characteristics and the working requirements of the ice water pool, but also has good detachability, can be conveniently and repeatedly installed and dismantled, and does not influence the original structure and equipment of the ice water pool. The technical scheme of the invention is as follows:
a detachable rocker plate type wave-making system applicable to a low-temperature towing ice water tank comprises at least one wave-making machine 1, a vertical bracket 6, a horizontal bracket 8, a rail supporting seat 9 and a rail 20, wherein,
each wave generator 1 comprises a rocking plate 2, a swing shaft 12, a servo drive system 4, a seal box 3 and a pool bottom foundation steel frame 5; the servo driving system 4 is arranged in the seal box 3 and comprises a servo motor and a double-output-shaft type speed reducer, and the two rocker plate swing shafts 12 are respectively connected with the output shafts of the double-output-shaft type speed reducer through a coupler 14; the rocking plate pendulum shaft 12 extends out of the seal box through the dynamic seal interface 13 and is connected with a bearing 21 fixed on a basic steel frame, and the servo driving system 4 drives the rocking plate 2 to swing through the rocking shaft 12.
The tank bottom foundation steel frames 5 of the adjacent wave making machines 1 are fixedly connected, so that the concentricity of the pendulum shafts of the wave making machines 1 is ensured; the basic steel frames 5 of the wave making machine 1, which are close to the positions of the walls 7 of the ice water pool on two sides, are respectively and fixedly connected to the vertical support 6, the upper parts of the walls 7 of the ice water pool on two sides are respectively and fixedly provided with the track 20 and the track support seat 9, and the vertical support 6 is connected to the track support seat 9 through the horizontal support 8.
Preferably, the pool bottom foundation steel frame 5 is placed on a rubber mat layer 17 laid on the pool bottom.
The invention discloses a detachable rocker plate type wave generator which can be applied to a low-temperature towed ice water tank. Compared with the existing normal water wave making machine, the invention has the following advantages in the ice water pool environment:
(1) the invention improves the position of the servo driving system of the wave making machine, the servo system is arranged in the sealed box, and the sealed box is arranged at the bottom of the pool. At present, the number of low temperature towing ice pool laboratories operating well worldwide is small, and the wave generating device is not installed except for the very individual ice pool, which is mainly caused by the limitation of the above technical problems. In the low-temperature towing ice water tank with the wave generating device, the structural form of the wave generating device is almost the same as that of a normal water rocker type wave generating machine, the low-temperature resistance is enhanced, and the low-temperature towing ice water tank can operate in a low-temperature environment. A series of rocker plate type wave generators in the laboratory are fixed on the wall of one end of an ice water pool, so that a large experimental space is occupied, and the output power of a driving system is obviously attenuated at low temperature. The existing application examples are that the wave generator driving system is arranged on the wall of the pool or the upper part of the wave generating device to avoid contacting with water no matter the wave generator is arranged in a normal water environment or an ice water pool. The invention is an innovative improvement on the problem that the servo driving system of the wave making machine is placed in a sealed box and is arranged at the bottom of the pool. The swing shaft of the swing plate extends out of the box body through a dynamic seal port on the seal box to drive the swing plate to swing. The cable and the like extend out of the static sealing port on the sealing box to be connected with equipment such as a control cabinet and the like on the ground. In order to avoid water inflow caused by sealing failure, particularly a dynamic sealing port with a swing shaft extending out, the sealing condition needs to be checked and proper repair needs to be carried out when the wave making machine continuously operates for 3-6 months. After the wave generator is improved, the wave generator has the following advantages in the aspect of adaptability of the ice water pool:
● the rocker swing shaft passes through the double output shaft type speed reducer, the speed reducer directly drives and controls the swing shaft to rotate, the power loss in the mechanical transmission process is reduced, and the output efficiency of the servo drive system is improved.
● in working condition, the air temperature in the laboratory of the low temperature towing ice water pool can reach-25 ℃ at the lowest, and the water temperature in the water pool is kept at 0 ℃ or above. Arrange servo drive system in aquatic, can effectively avoid leading to output attenuation or even unable work because of ambient temperature crosses lowly, the temperature can guarantee the effective heat dissipation of servo drive system during operation simultaneously.
● the design style that the servo drive system is arranged in the underwater sealed box, the structure of the wave generator is simplified to a great extent, the volume of the wave generator is reduced, and the precious test space of the low-temperature towing ice water pool is saved.
(2) The invention improves the driving mode of the rocking plate type wave making machine. The traditional rocking plate type wave generator is usually connected with the upper part of a rocking plate through a bent rod or a telescopic rod, and pushes (pulls back) the rocking plate to swing back and forth around a swing shaft. The driving mode determines that the other end of the curved rod or the telescopic rod must be fixed on a wave maker mechanism with high rigidity, so that the wave maker has large overall mass and volume and must be stably connected with a water pool. This results in a high technical difficulty in installing the wave generator on the basis of the existing low-temperature towing ice water tank. The swinging plate swinging shaft is connected with the output shaft of the double-output shaft type speed reducer through the coupler, and the swinging plate is directly driven and controlled to swing through the output shaft of the speed reducer. The improvement greatly simplifies the transmission mode of the rocking plate type wave generator, the wave generator does not need a huge rigid frame any more, the mass and the volume of the wave generator are reduced, and the wave generator can be conveniently installed and detached in the existing ice water pool.
(3) The invention improves the structural style of the wave making machine, so that the wave making machine is more suitable for the water surface condition of the ice water pool. Before an ice model test is developed in a low-temperature towing ice pool, model ice rows are generated on the water surface by cooling. A frame structure and a plurality of transmission members are arranged near the water surface of a traditional normal water rocking plate type wave making machine, and the transmission members can be frozen along with the water surface in the freezing process, so that the normal operation cannot be realized. The transmission mechanism of the rocking plate type wave generator is arranged at the water bottom, only the rocking plate is arranged near the water surface, and the ice cover on the water surface of the wave generating area can be removed before the test to run.
(4) The invention adopts the design of the split-type wave generator with the rocking plate, improves the detachability of the wave generator and facilitates the installation and the removal. Firstly, a plurality of groups of rocking plate wave generators are uniformly arranged along the width direction of the ice water pool, the installed power of each group of wave generators is reduced, the mass and the volume of a single set of wave generator are reduced, and the installation and the removal are convenient. Meanwhile, the wave making machine is more adaptive to different widths of ice water pools by adopting a plurality of wave making machine types, and the number of the wave making machine sets can be increased or decreased according to different widths of the ice water pools. On the other hand, each group of rocking plate wave-making machines comprises a supporting base, an underwater sealing box, a rocking plate, a swing shaft, a coupler, a servo motor, a speed reducer, a cable, a control system and the like. The components and the equipment can be independently disassembled and assembled and disassembled on the site of the low-temperature towing ice water pool, so that the detachability of the wave maker is improved.
(5) The invention improves the fixing mode of the rocking plate type wave making machine. The conventional normal water rocking plate type wave generator mostly adopts a mode of anchor bolts to fix a structure on the wall of a water pool or the bottom of the water pool. The low-temperature towing ice water pool needs to make model ice in the pool, which requires that insulation layers are arranged on the pool wall and the pool bottom when the pool is built. Therefore, the mounting mode of the foundation bolt of the traditional wave generator with the rocking plate can damage the heat-insulating layer of the water tank, and is not suitable for mounting in the ice water tank. The wave generator is fixed by the pool bottom foundation steel frame, the vertical support on the pool wall and the horizontal support inserted below the rail support seat, and the horizontal force and the overturning moment of the wave generator during operation are balanced by the constraint of the rail support seat on the horizontal support and the friction force of the foundation steel frame. The fixing mode does not need to punch holes on the wall or the bottom of the ice water pool, and the structure of the ice water pool cannot be damaged.
Drawings
Fig. 1 is a front view of a 3-set rocker plate type wave generator installed in a low-temperature towing ice water tank.
Fig. 2 is a top view of 3 sets of rocker plate type wave making machine base steel frames, horizontal supports and the like which are installed in an ice water pool.
FIG. 3 is a side view of 3 sets of rocker plate type wave making machine base steel frames, vertical supports and the like which are installed in an ice water pool.
The reference numbers in the figures illustrate: 1. the ice water tank is provided with a detachable rocker plate type wave making machine; 2. shaking the plate; 3. sealing the box underwater; 4. a servo drive system; 5. a foundation steel frame; 6. a vertical support; 7. the wall of the ice water pool; 8. a horizontal support; 9. a rail support seat; 10. a rocker arm channel steel; 11. rocker plate reinforcing rib angle steel; 12. a pendulum shaft; 13. a dynamic seal opening of the seal box; 14. a coupling; 15. a base steel frame channel; 16. angle steel of the foundation steel frame aggregate; 17. a rubber cushion layer; 18. horizontal bracket frame angle steel; 19. filling rubber with gaps; 20. testing a trailer track; 21. a pendulum shaft bearing; 22. a vertical support frame channel steel; 23. and angle steel for inclined strut of the vertical bracket.
Detailed Description
The invention designs an improved detachable rocking plate type wave generator 1 suitable for a low-temperature towing ice water tank by utilizing a rocking plate wave generating principle. The rocking plate 2 is higher than the water surface when standing upright, and is always ensured above the water surface in the wave-making and swinging process. The surface of the rocking plate is a stainless steel plate with the thickness of 3mm, the periphery of the steel plate is a frame formed by [10 stainless steel channels 10, and the middle of the steel plate is also provided with an X-shaped inclined strut formed by L50 stainless steel angle steel 11 as an aggregate. Channel steel on two sides of the rocking plate is used as a rocker arm and connected to an underwater swing shaft 12, and the swing shaft swings to drive the upper rocking plate to reciprocate along with the swing shaft.
The rocking plate pendulum shaft is connected with an output shaft of a double-output shaft type speed reducer through a coupler 14, and the servo motor and the speed reducer directly drive the rocking shaft to rotate, so that the motion of the rocking plate is controlled. Wherein, the output power of the servo motor is 7.5kW, and the maximum output torque of the speed reducer is 7000 kN.m. The driving system (comprising a servo motor, a speed reducer, a driver, a cable and the like) is arranged in the underwater sealing box 3, the appearance of the underwater sealing box is the outline of the servo motor and the speed reducer, and a proper gap is reserved between the driving system and the underwater sealing box, so that the buoyancy of the sealing box is reduced. The pendulum shaft stretches into the box through the dynamic seal mouth 13 of seal box both sides and is connected with the shaft coupling, and every seal box is except these two dynamic seal mouths, still has a quiet seal mouth to be used for the cable to wear out to ground and link to each other with the switch board. The sealed box body is formed by splicing reinforced stainless steel plates with the thickness of 3mm, and deformation is avoided when the equipment is operated and water pressure is applied.
The seal box is installed on a basic steel frame 5 through bolts, and the basic steel frame is a frame structure formed by welding [10 stainless steel channel steel 15 and L50 stainless steel angle steel 16. The basic steel frame is arranged on the rubber cushion layer 17, and the friction force between the basic steel frame and the bottom of the pool is increased. The sides of adjacent basic steel frames are tightly attached and connected by bolts, so that the concentricity of the swing shaft of the wave making machine of each group of the rocking plates is ensured. Vertical supports 6 are arranged at the positions, close to the pool wall, of the two sides of the wave making machine, and are mainly used for connecting a horizontal support 8 above the pool wall and a basic steel frame 5 at the bottom of the pool. The horizontal bracket 8 is inserted into the gap below the track supporting seat 9 on the tank wall, and the gap between the bracket angle steel 18 and the supporting seat is filled with rubber to form a rubber joint 19, so that horizontal and vertical restraint is provided for the horizontal bracket. According to the invention, the horizontal and vertical constraints of the wave generator structure are provided through the basic steel frame, the vertical bracket and the horizontal bracket, so that damage to the ice water pool caused by fixing modes such as foundation bolts is avoided.
Each group of servo driving systems is independently controlled by software, so that the motion synchronism of each group of rocking plates is ensured. And compiling a motion equation of the rocking plate according to a wave-making theory of the rocking plate type wave-making machine, and controlling each rocking plate to swing and make waves according to a preset program. According to the test running condition of the rocking plate type wave making machine in the ice water pool, regular waves with the maximum wave height of 0.25m and the maximum wave period of 3s can be effectively generated.
Servo motor and speed reducer are furnished with the brake function of locking among the actuating system, and when not needing to make the ripples, the rocking plate falls down at the bottom of the pool and locks and dies, does not influence the normal use in low temperature drag ice water pond. When the wave-making operation is needed, firstly, model ice covers or broken ice on the water surface of the wave-making area is removed, the rocking plate is lifted to the vertical position, and the wave-making movement is started by taking the position as the initial position.
Claims (2)
1. A detachable rocker plate type wave generating system capable of being applied to a low-temperature towing ice water tank comprises at least one wave generating machine (1), a vertical support (6), a horizontal support (8), a rail support seat (9) and a rail (20). Wherein,
each wave generator (1) comprises a rocking plate (2), a swing shaft (12), a servo driving system (4), a seal box (3) and a pool bottom foundation steel frame (5); the servo driving system (4) is arranged in the seal box (3) and comprises a servo motor and a double-output-shaft type speed reducer, and the two rocker plate swing shafts (12) are respectively connected with the output shafts of the double-output-shaft type speed reducer through a coupler (14); a swing shaft (12) of the swing plate extends out of the seal box through a dynamic seal interface (13) and is connected with a bearing (21) fixed on a basic steel frame, and a servo driving system (4) drives the swing plate (2) to swing through the swing shaft (12).
The tank bottom foundation steel frames (5) of the adjacent wave making machines (1) are fixedly connected, so that the concentricity of the pendulum shafts of the wave making machines (1) is ensured; the basic steel frame (5) of the wave generator (1) with two sides close to the positions of the ice water pool walls (7) are respectively and fixedly connected to the vertical support (6), the upper parts of the ice water pool walls (7) on the two sides are respectively and fixedly provided with the track (20) and the track support seat (9), and the vertical support (6) is connected to the track support seat (9) through the horizontal support (8).
2. The detachable rocker plate type wave generator (1) according to claim (1), characterised in that the tank bottom foundation steel frame (5) is placed on a rubber cushion (17) laid on the tank bottom.
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| CN201710615689.2A CN107478406A (en) | 2017-07-26 | 2017-07-26 | A kind of dismantled and assembled rocking plate type wave making system that can be applied to low temperature towing ice model tank |
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| CN201710615689.2A CN107478406A (en) | 2017-07-26 | 2017-07-26 | A kind of dismantled and assembled rocking plate type wave making system that can be applied to low temperature towing ice model tank |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108717017A (en) * | 2018-08-07 | 2018-10-30 | 上海海事大学 | Arctic navigation Marine Materials low temperature environment frictional impact performance testing device |
| CN109029911A (en) * | 2018-06-26 | 2018-12-18 | 江苏科技大学 | Rail circle oscillation level cylinder deep water ice test tank, which is made, involves combination attenuating shock wave system |
| CN109342016A (en) * | 2018-11-06 | 2019-02-15 | 哈尔滨工程大学 | Pool wall and bottom of pond simulator in a kind of towing basin |
| CN109946040A (en) * | 2019-03-25 | 2019-06-28 | 天津大学 | A kind of liftable wave making system |
| CN110346112A (en) * | 2019-08-09 | 2019-10-18 | 交通运输部天津水运工程科学研究所 | A kind of easy-to-mount adjustable wave maker for making wave width |
| CN110823508A (en) * | 2019-11-07 | 2020-02-21 | 哈尔滨工程大学 | Experimental device for simulating pie-shaped ice drifting accumulation on wind-driven waves |
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| CN109029911A (en) * | 2018-06-26 | 2018-12-18 | 江苏科技大学 | Rail circle oscillation level cylinder deep water ice test tank, which is made, involves combination attenuating shock wave system |
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| CN109946040B (en) * | 2019-03-25 | 2024-02-09 | 天津大学 | Liftable wave generation system |
| CN110346112A (en) * | 2019-08-09 | 2019-10-18 | 交通运输部天津水运工程科学研究所 | A kind of easy-to-mount adjustable wave maker for making wave width |
| CN110346112B (en) * | 2019-08-09 | 2024-01-26 | 交通运输部天津水运工程科学研究所 | Wave generator with adjustable wave generating width and convenient to assemble and disassemble |
| CN110823508A (en) * | 2019-11-07 | 2020-02-21 | 哈尔滨工程大学 | Experimental device for simulating pie-shaped ice drifting accumulation on wind-driven waves |
| CN110823508B (en) * | 2019-11-07 | 2021-10-19 | 哈尔滨工程大学 | Experimental device for simulating pie-shaped ice drifting accumulation on wind-driven waves |
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