Oscillation test device applicable to filling and unloading states of liquid tank of liquid cargo ship

Abstract

The invention discloses a sloshing test device applicable to filling and unloading states of a liquid tank of a liquid cargo ship, which comprises a bracket system arranged on a three-dimensional wave water tank wall, and an experimental liquid tank model which is positioned below the bracket system and has two sides movably connected with the bracket system through a group of connecting systems, the filling / unloading device is placed beside the three-dimensional wave water tank and communicated with an inner cavity of the experiment liquid tank model through a pipeline, and the experiment measuring devices are installed on the wall of the three-dimensional wave water tank and the inner wall face of the experiment liquid tank model. Wherein the experimental liquid tank model is placed in a three-dimensional wave water tank added with water, and the connecting system is used for achieving free heaving motion and free rolling motion of the experimental liquid tank model under excitation of three-dimensional waves. According to the invention, the liquid tank model only has motion freedom degrees in rolling and heaving directions, the influence of sloshing on liquid tank filling / unloading is reduced, and the liquid filling / unloading rate can be monitored and adjusted in real time in the experiment process.

Description

Technical Field

[0001] The invention relates to a mechanical motion control device, in particular to a sloshing test device suitable for a liquid tank of a liquid cargo ship under filling and unloading conditions. Background Art

[0002] Marine transportation has always been an important part of global trade, among which the transportation of liquid cargoes occupies an important position. Marine bunkering operations are common in both production transportation and fuel bunkering. The most common and universal way to transfer liquid cargoes is to dock pipelines and extract or fill the tanks. However, at sea, liquid cargo ships are affected by waves, causing various swaying motions of the hull. Swaying motions not only affect the safety and efficiency of unloading operations, but may also pose a potential threat to leakage and pollution of liquid cargoes. Therefore, a device is needed to study the impact of filling / unloading on tank sloshing. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a sloshing test device suitable for the filling and unloading of the liquid tank of a liquid cargo ship, so that the liquid tank model has only the degrees of freedom of movement in the roll and heave directions, reducing the influence of sloshing on the filling / unloading of the liquid tank, and being able to monitor and adjust the rate of liquid filling / unloading in real time during the experiment.

[0004] Technical solution: The present invention is a sloshing test device suitable for the filling and unloading state of the liquid tank of a liquid cargo ship, comprising a support system placed on the wall of a three-dimensional wave tank, an experimental liquid tank model located below the support system and movably connected to the support system on both sides through a group of connection systems, a filling / unloading device placed beside the three-dimensional wave tank and connected to the inner cavity of the experimental liquid tank model through a pipeline, and an experimental measuring device installed on the wall of the three-dimensional wave tank and the inner wall of the experimental liquid tank model; wherein the experimental liquid tank model is placed in a three-dimensional wave tank filled with water, and the connection system is used to realize the free heave motion and free roll motion of the experimental liquid tank model under the excitation of three-dimensional waves.

[0005] Furthermore, the connection system includes a fixed chuck, a ceramic bearing, a fixed connector, and a linear optical axis; the fixed chuck is fixedly installed in the center of the side of the experimental liquid tank model; the ceramic bearing is adapted to the fixed chuck, and the ceramic bearing is embedded in the central groove of the fixed chuck; the fixed connector includes a square part with a longitudinal opening and a cylindrical part connected to the side of the square part, the cylindrical part of the fixed connector is inserted into the ceramic bearing, and the linear optical axis is inserted into the hole of the square part of the fixed connector; under the excitation of three-dimensional waves, the experimental liquid tank model performs free roll motion around the ceramic bearing, and the experimental liquid tank model performs free vertical swing motion along the linear optical axis.

[0006] Furthermore, the support system includes a port platform and a starboard platform arranged in parallel, a bow side beam and a stern side beam arranged in parallel at both ends of the port platform, and the port platform, the starboard platform, the bow side beam and the stern side beam enclose a square frame; a bow side support center beam and a stern side support center beam parallel to each other are connected between the middle section of the port platform and the middle section of the starboard platform; two groups of guide shaft supports are symmetrically arranged on the same side of the stern side support center beam for installing the connection system.

[0007] Furthermore, the experimental liquid tank models of different sizes can be adapted by adjusting the spacing between the two groups of guide shaft supports.

[0008] Furthermore, a profile is arranged on the side of the central cross beam of the bow side bracket for installing a filling pipe in the filling / unloading device.

[0009] Furthermore, the filling / unloading device includes a constant flow peristaltic pump, a water pipe, a filling pipe, and a water tank; the constant flow peristaltic pump is placed between the three-dimensional wave water tank and the water tank, the water pipe is installed on the constant flow peristaltic pump, the water pipe is connected to the filling pipe, and the filling pipe is located in the center of the inner cavity of the experimental liquid tank model.

[0010] Furthermore, the constant flow peristaltic pump performs bidirectional transportation to achieve filling / unloading.

[0011] Furthermore, the water pipe is a transparent hose, and the filling pipe is made of transparent organic glass.

[0012] Furthermore, the experimental measurement device includes multiple digital wave height meters, which are installed on the three-dimensional wave tank and the inner wall of the experimental liquid tank model to detect the quality of waves in the three-dimensional wave tank and the free liquid surface state in the experimental liquid tank model.

[0013] Furthermore, the experimental measurement device includes a pressure sensor installed on the inner wall of the experimental liquid tank model to measure the impact force of the sloshing motion of the liquid in the experimental liquid tank model on the tank wall.

[0014] Beneficial effects: Compared with the prior art, the significant technical effects of the present invention are as follows:

[0015] The present invention adopts a connection system, which enables the experimental liquid tank model to move in two degrees of freedom, namely, roll and heave, under the action of waves. At the same time, a filling / unloading device is adopted, which has a two-way transportation function, can accurately and stably control the flow, and provide clear and visible data. Through the connection system, the present invention solves the problem that the experimental liquid tank model usually moves in a single degree of freedom under the action of waves, and it is difficult to achieve two degrees of freedom of roll and heave at the same time, and meets the needs of different experimental situations. The filling / unloading device solves the problem that there is usually only one-way flow in the experiment, and the traditional device lacks accuracy and ease of operation in flow control. The present solution has a simple structure, convenient maintenance, easy disassembly and assembly, can stably meet the experimental requirements, and the flow control is more accurate and the data reading is clear, thereby improving the reliability and ease of operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a structural schematic diagram of the support system;

[0018] Figure 3 It is a structural diagram of the connection system;

[0019] Figure 4 This is a schematic diagram of the structure of the filling / unloading device. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is described in detail below in conjunction with specific implementation methods and the accompanying drawings of the specification.

[0021] like Figures 1 to 4 As shown, the sloshing test device for tank filling and unloading of a liquid cargo ship of the present invention can be used to simulate filling / unloading and tank sloshing response in three-dimensional waves. Specifically, it involves the following components: support system 1, port platform 101, starboard platform 102, bow side support center beam 103, stern side support center beam 104, bow side beam 105, stern side beam 106, guide shaft support 107, profile 108, connection system 2, fixed chuck 201, ceramic bearing 202, fixed connector 203, linear optical axis 204, experimental tank model 3, filling / unloading device 4, constant flow peristaltic pump 401, water pipe 402, filling pipe 403, water tank 404, experimental measurement device 5, digital wave height meter 501.

[0022] The support system 1 is connected by bolts and can be placed in a three-dimensional wave tank, a pool or other test site to fix the entire experimental tank model. The size of the support system 1 can be freely adjusted according to the size of the experimental tank in the specific test. The experimental tank model 3 is connected to the support system 1 through the connection system 2. The bearings and linear optical axis of the connection system 2 are used to limit the freedom of movement of the experimental tank model 3. Through the wave-making system of the test site, the experimental tank model 3 can move in two degrees of freedom, namely, rolling and heaving, under the action of waves. The filling / unloading device 4 uses a constant flow peristaltic pump 401 to realize the filling / unloading of the liquid in the experimental tank model 3, thereby more realistically simulating the motion response of the liquid cargo ship when encountering waves on the ocean during the filling / unloading process. The specific model of the constant flow peristaltic pump can be determined according to the size of the tank. Therefore, this set of devices can well simulate the hydrodynamic performance of the liquid-carrying ship when filling / unloading at sea, and test some effects on the hydrodynamic performance.

[0023] like Figure 1 As shown, the support system 1 is placed on the wall of the three-dimensional wave tank to support and fix the entire device. The experimental tank model 3 is located below the support system 1 and is movably connected to the support system 1 on both sides through a set of connection systems 2, and the connection system 2 is connected to the center of the side of the experimental tank model 3. The experimental tank model 3 is placed in a three-dimensional wave tank with a certain amount of water added. The connection system 2 limits the four degrees of freedom of pitch, sway, bow and pitch of the experimental tank model 3 through bearings and linear optical axes, so that the experimental tank model 3 can only perform free heave and free roll motions under the excitation of three-dimensional waves. The filling / unloading device 4 is placed next to the three-dimensional wave tank and is connected to the inner cavity of the experimental tank model 3 through a pipeline. The experimental measurement device 5 is installed on the wall of the three-dimensional wave tank and the inner wall of the experimental tank model 3. The experimental measurement device 4 is installed in the tank of the experimental tank model 3 according to the value to be measured.

[0024] The support system 1 can stabilize the entire liquid tank device and effectively reduce the shaking of the experimental fixture caused by the wave load, thereby reducing the impact of the wave load on the experimental fixture. Figure 2As shown, the support system 1 includes a port side platform 101, a starboard platform 102, a bow side support center beam 103, a stern side support center beam 104, a bow side beam 105, a stern side beam 106, a guide shaft support 107, and a profile 108. The port side platform 101 and the starboard platform 102 are arranged in parallel, the bow side beam 105 and the stern side beam 106 are arranged in parallel at both ends of the port side platform 101, and the port side platform 101, the starboard platform 102, the bow side beam 105 and the stern side beam 106 enclose a square frame. The bow side support center beam 103 and the stern side support center beam 104, which are parallel to each other, are connected between the middle section of the port side platform 101 and the middle section of the starboard platform 102. Two sets of guide shaft supports 107 are symmetrically arranged on the same side of the central cross beam 104 of the stern side support, which are used to install and fix the linear optical axis 204 in the connection system 2, and the linear optical axis 204 is fixedly connected to the support system 1 through the guide shaft supports 107. A profile 108 is arranged on the side of the central cross beam 103 of the bow side support, which is used to install the filling pipe 403 in the filling / unloading device 4. In this embodiment, the profile 108 is fixed to the central cross beam 103 of the bow side support by bolts and nuts, and is used to fix the filling pipe 403. The above beams are all arranged horizontally and connected by bolts and nuts.

[0025] In this embodiment, the distance between the two sets of guide shaft supports 107 is adjusted to accommodate experimental liquid tank models 3 of different sizes.

[0026] like Figure 1 and Figure 3As shown, the connection system 2 includes a fixed chuck 201, a ceramic bearing 202, a fixed connector 203, and a linear optical axis 204. In this embodiment, the fixed connector 203 is an aluminum fixed connector. The fixed chuck 201 is fixedly installed in the center of the side of the experimental liquid tank model 3, and the ceramic bearing 202 is adapted to the fixed chuck 201, and the ceramic bearing 202 can be embedded in the central groove of the fixed chuck 201. The fixed chuck 201 can be fixed on the experimental liquid tank model 3 by bolts, nuts or interference fit. The fixed connector 203 includes a block part with a longitudinal opening and a cylindrical part connected to the side of the block part. The cylindrical part of the fixed connector 203 is inserted into the ceramic bearing 202, so that the experimental liquid tank model 3 can roll under wave excitation. The linear optical axis 204 is inserted into the hole of the block part of the fixed connector 203, and the tightness is adjusted by bolts, so that the experimental liquid tank model 3 and the part connected thereto can swing under wave excitation. The connection system 2 is fixedly connected to the support system 1 through the linear optical axis 204. The linear optical axis 204 passes through the guide shaft support 107 arranged vertically in the support system 1. The guide shaft support 107 fixes the linear optical axis 204 by tightening screws to prevent it from generating vertical displacement. Under the excitation of three-dimensional waves, the experimental liquid tank model 3 performs free roll motion around the ceramic bearing 202, and the experimental liquid tank model 3 performs free heave motion along the linear optical axis 204.

[0027] The connection system 2 limits the four degrees of freedom of the experimental liquid tank model 3, namely, pitch, sway, bow and heave, through the ceramic bearing 202 and the linear optical axis 204, so that the liquid tank model has only the degrees of freedom of movement in the directions of roll and heave.

[0028] The experimental liquid tank model 3 releases the two degrees of freedom of roll and heave of the experimental liquid tank model 3 through the cooperation of the fixed chuck 201, ceramic bearing 202, fixed connection part 203 and linear optical axis 204 in the connection system 2, and restricts the movement of the experimental liquid tank model 3 in other degrees of freedom.

[0029] By arranging a linear optical axis 204 and a ceramic bearing 202 on the same side, the strength of the linear optical axis 204 in the horizontal direction can be enhanced, the deformation of the linear optical axis 204 caused by the load can be effectively reduced, and the accuracy of the experimental liquid tank model 3 in the heaving motion direction is improved, thereby reducing the influence of wave loads on the experimental fixture and improving the accuracy of the experiment.

[0030] The experimental tank model 3 is connected to the tank model displacement limiting system through the fixed chuck 201. The normal direction of the plane where the fixed chuck 201 is located is parallel to the x-axis. The ceramic bearing 202 is adapted to the central groove of the fixed chuck 201. The fixed chuck 201 is embedded in the groove of the fixed chuck 201. Under wave excitation, the ceramic bearing 202 can rotate around the x-axis, and the fixed chuck 201 only rotates around the x-axis. The ceramic bearing 202 is adapted to the cylindrical part of the aluminum fixed connector 203, so that the experimental tank model rolls around the x-axis after being excited by waves.

[0031] The upper part of the linear optical axis 204 is connected to the support system 1 through the guide shaft support 107. The linear optical axis 204 is parallel to the z-axis. Under wave excitation, the experimental liquid tank model 3 and the liquid tank model displacement limiting system drive the aluminum fixed connector to move in the z-axis direction on the linear optical axis 204. The aluminum fixed connector moves only in the z-axis direction. The aluminum fixed connector is arranged on the linear optical axis 204 and connected to the linear optical axis 204 by bolts and nuts, so that the liquid tank model displacement limiting system and the experimental liquid tank model 3 perform heave motion in the z-axis direction after being excited by waves.

[0032] This solution is to connect two symmetrical fixed chucks 201 symmetrically on both sides of the experimental liquid tank model 3, and place the axis of the fixed chuck 201 and the ceramic bearing 202 at the rotation center of the experimental liquid tank model 3, and embed the ceramic bearing 202 matched on the aluminum fixed connector 203 into the central groove of the fixed chuck 201, so that the experimental liquid tank model 3 can perform free rolling motion under the excitation of three-dimensional waves; insert the linear optical axis 204 into the aluminum fixed connector 203, so that the experimental liquid tank model 3 can perform free vertical swing motion under the excitation of three-dimensional waves. The linear optical axis 204 is fixed to the bracket system 1 through the fastening screws in the guide shaft support 107, so that the connection system 2 is installed and fixed on the bracket system 1, and the fixing of the experimental liquid tank model 3 and the restriction and release of displacement are completed at the same time.

[0033] like Figure 4 As shown, the filling / unloading device 4 includes a constant flow peristaltic pump 401, a water pipe 402, a filling pipe 403, and a water tank 404. The constant flow peristaltic pump 401 is placed between the three-dimensional wave water tank and the water tank 404, which is convenient for filling / unloading the experimental liquid tank model. The water pipe 402 is used in conjunction with the constant flow peristaltic pump 401, and one end of the water pipe 402 is directly stuck on the constant flow peristaltic pump 401. The other end of the water pipe 402 is connected to the filling pipe 403, and the filling pipe 403 is installed on the profile 108. The filling pipe 403 is in the center of the inner cavity of the experimental liquid tank model 3 under the limiting effect of the profile 108. The filling pipe 403 is fixed to the middle part of the liquid tank by connecting to the profile 108, so as to minimize the influence of the filling pipe 403 on the movement of the liquid in the liquid tank. The water tank 404 is placed next to the constant flow peristaltic pump 401.

[0034] In this embodiment, the constant flow peristaltic pump 401 can conveniently control the flow rate and the direction of the water pump suction, perform two-way transportation, and realize filling / unloading. The constant flow peristaltic pump 401 adopts a peristaltic pump with the advantages of precise flow control, clear data, and convenient operation, which can reduce the error in the filling / unloading process. The constant flow peristaltic pump 401 has self-priming ability, does not need to be primed, the data is clear, and the operation is very convenient and simple.

[0035] In this embodiment, the water pipe 402 is a transparent hose, which can clearly observe the flow state of the liquid. The filling pipe 403 is made of transparent organic glass, which can clearly observe the flow of the internal liquid, and is placed in the middle of a compartment of the experimental liquid tank model 3, which has little effect on the sloshing of the liquid in the experimental liquid tank model 3. At the beginning of the filling process, it is necessary to ensure that there is no air in the filling pipe, ensure the stability of the flow rate, and eliminate the influence of bubbles. The water tank uses a transparent water tank, which is convenient for observing the filling / unloading status so as to switch the water pump on and off in time.

[0036] like Figure 1 As shown, the experimental measurement device 5 includes multiple digital wave height meters and multiple pressure sensors. The multiple digital wave height meters are installed on the three-dimensional wave tank and the inner wall surface of the experimental liquid tank model 3 to detect the mass of the waves in the three-dimensional wave tank and the free liquid surface state in the experimental liquid tank model 3. By arranging the digital wave height meter in the experimental liquid tank model 3, the free liquid surface change generated by the liquid in the liquid tank under the excitation of external waves can be measured. The pressure sensor is installed on the inner wall of the experimental liquid tank model 3 to measure the impact force of the sloshing motion of the liquid in the experimental liquid tank model 3 on the bulkhead.

Claims

1. A sloshing test device suitable for tank filling and unloading of liquid cargo ships, characterized in that: The invention comprises a support system (1) placed on the wall of a three-dimensional wave tank, an experimental liquid tank model (3) located below the support system (1) and movably connected to the support system (1) on both sides through a set of connection systems (2), a filling / unloading device (4) placed beside the three-dimensional wave tank and connected to the inner cavity of the experimental liquid tank model (3) through a pipeline, and an experimental measurement device (5) installed on the wall of the three-dimensional wave tank and the inner wall surface of the experimental liquid tank model (3); wherein the experimental liquid tank model (3) is placed in the three-dimensional wave tank filled with water, and the connection system (2) is used to enable the experimental liquid tank model (3) to perform free heave motion and free roll motion under the excitation of three-dimensional waves.

2. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 1, characterized in that: The connection system (2) comprises a fixed chuck (201), a ceramic bearing (202), a fixed connection piece (203), and a linear optical axis (204); The fixed chuck (201) is fixedly mounted at the center of the side of the experimental liquid tank model (3); The ceramic bearing (202) is matched with the fixed chuck (201), and the ceramic bearing (202) is embedded in the central groove of the fixed chuck (201); The fixed connection piece (203) comprises a block portion having a longitudinal opening and a cylindrical portion connected to the side of the block portion, the cylindrical portion of the fixed connection piece (203) is inserted into the ceramic bearing (202), and the linear optical axis (204) is inserted into the hole of the block portion of the fixed connection piece (203); Under the excitation of three-dimensional waves, the experimental liquid tank model (3) performs free roll motion around the ceramic bearing (202), and the experimental liquid tank model (3) performs free heave motion along the linear optical axis (204).

3. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 1, characterized in that: The support system (1) comprises a port side platform (101) and a starboard side platform (102) arranged in parallel, a bow side cross beam (105) and a stern side cross beam (106) arranged in parallel at both ends of the port side platform (101), and the port side platform (101), the starboard platform (102), the bow side cross beam (105) and the stern side cross beam (106) are enclosed to form a square frame; A bow side support center beam (103) and a stern side support center beam (104) parallel to each other are connected between the middle section of the port side platform (101) and the middle section of the starboard side platform (102); Two groups of guide shaft supports (107) are symmetrically arranged on the same side of the central crossbeam (104) of the stern support for installing the connection system (2).

4. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 3, characterized in that: The experimental liquid tank models (3) of different sizes can be adapted by adjusting the spacing between the two groups of guide shaft supports (107).

5. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 3, characterized in that: A profile (108) is arranged on the side of the central cross beam (103) of the bow side support for installing a filling pipe (403) in the filling / unloading device (4).

6. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 1, characterized in that: The filling / unloading device (4) comprises a constant flow peristaltic pump (401), a water pipe (402), a filling pipe (403), and a water tank (404); The constant flow peristaltic pump (401) is placed between the three-dimensional wave water tank and the water tank (404), the water pipe (402) is installed on the constant flow peristaltic pump (401), the water pipe (402) is connected to the filling pipe (403), and the filling pipe (403) is located in the center of the inner cavity of the experimental liquid tank model (3).

7. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 6, characterized in that: The constant flow peristaltic pump (401) performs bidirectional transportation to achieve filling / unloading.

8. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 6, characterized in that: The water pipe (402) is a transparent hose, and the filling pipe (403) is a filling pipe made of transparent organic glass.

9. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 1, characterized in that: The experimental measurement device (5) comprises a plurality of digital wave height meters, which are installed on a three-dimensional wave tank and on the inner wall surface of the experimental liquid tank model (3) and are used to detect the mass of waves in the three-dimensional wave tank and the state of the free liquid surface in the experimental liquid tank model (3).

10. The sloshing test device for tank filling and unloading of a liquid cargo ship according to claim 1, characterized in that: The experimental measurement device (5) comprises a pressure sensor, which is installed on the inner wall of the experimental liquid tank model (3) and is used to measure the impact force of the sloshing movement of the liquid in the experimental liquid tank model (3) on the tank wall.

Images