Method for measuring stress distribution of trash holding net bag

Abstract

The invention provides a method for measuring stress distribution of a trash holding net bag, which comprises the following steps of: uniformly arranging a plurality of tension sensors on each of four side surfaces arranged on the trash holding net bag along the length direction; the inlet side of the trash holding net bag is suspended on the mooring rope; setting a plurality of groups of water flow velocities in a range of 0.1 m / s to 1.0 m / s, and testing the trash holding net bag at different water flow velocities to obtain a tension value at each tension sensor; the test conditions that the water flow speed is 0.1 m / s, 0.3 m / s and 0.5 m / s, the wave height is 0.3 m, and the wave period is 4 s and 5 s are set, the trash holding net bag is tested, and the tension value of each tension sensor is obtained; and analyzing the change condition of the tension value to obtain the tension distribution characteristic of the trash holding net bag. The experimental device has the beneficial effects that the experimental device is used for researching the stress distribution rule of the trash holding net bag, and in combination with specific environmental conditions and requirements, the later production of the trash holding net can be optimally designed and improved so as to improve the intercepting effect and prolong the service life of the trash holding net.

Description

Technical Field

[0001] The invention belongs to the technical field of force analysis of a trash-blocking net bag, and in particular relates to a method for measuring the force distribution of a trash-blocking net bag. Background Art

[0002] Nuclear power plants usually require a large amount of cooling water to maintain their operation, and this water source often comes from the ocean or large water bodies. If the cooling water system is blocked by garbage or organisms, it may affect the normal operation of the nuclear power plant and even cause safety problems. In response to this, in nuclear power plants, multiple pollution nets are compactly arranged in an array outside the water intake position of the cooling water system to protect the cooling water system of the nuclear power plant from interference from underwater garbage and organisms.

[0003] The damage to the trash net may cause the following impacts: decreased operating efficiency. When the trash net is damaged, it cannot effectively intercept garbage and organisms, which may cause blockage of the water intake and affect the flow of cooling water, thereby reducing the operating efficiency of the nuclear power plant; increased maintenance costs. The damaged trash net needs to be repaired or replaced in time, which will increase additional maintenance costs and human resources; environmental impact. The damage to the trash net may allow the originally intercepted garbage and organisms to enter the marine environment, causing potential negative impacts on the marine ecosystem; economic losses. The obstruction of the operation of the nuclear power plant may lead to a reduction in power generation, resulting in economic losses, etc.

[0004] Therefore, studying the distribution of tension of water flow on the trash net is crucial to optimizing the design of the net and improving its service life and safety. Summary of the invention

[0005] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a method for measuring the force distribution of a trash net bag.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The method for measuring the force distribution of a trash net bag comprises the following steps:

[0008] S1. On the four sides of the trash-blocking net bag along the length direction, multiple tension sensors are evenly arranged on each side, and a hollow hole is opened on the side of the trash-blocking net bag corresponding to each tension sensor, and the tension sensor is fixedly connected to the middle of the corresponding hollow hole through multiple pull ropes in different directions;

[0009] S2. Suspend the inlet side of the trash net bag on the cable;

[0010] S3. Conduct a flow rate test, set multiple groups of water flow rates in the range of 0.1m / s to 1.0m / s, test the trash net bag in step S2 at different water flow rates, and obtain the tension value at each tension sensor;

[0011] S4. Conduct a wave and current test, set the water flow speed to 0.1m / s, 0.3m / s and 0.5m / s, the wave height to 0.3m, and the wave period to 4s and 5s respectively, and test the trash net bag in step S2 to obtain the tension value at each tension sensor;

[0012] S5. Analyze the changes in the tension values ​​at various locations of the trash net under different test conditions to obtain the distribution characteristics of the tension on the trash net.

[0013] Furthermore, in step S1, the tension sensors on the same side are evenly distributed in a zigzag shape.

[0014] Furthermore, tension sensors are arranged at four corners and in the middle of each side on the inlet side of the trash net bag.

[0015] Furthermore, the pull rope is evenly distributed along the circumference of the tension sensor, and one end of the pull rope is fixedly connected to the tension sensor, and the other end is fixedly connected to the edge of the hollow hole.

[0016] Furthermore, a plurality of floating balls are evenly arranged on the upper surface of the trash-blocking net bag.

[0017] Furthermore, in step S3, the water flow velocities are set to 0.1 m / s, 0.2 m / s, 0.3 m / s, 0.4 m / s, 0.5 m / s, 0.7 m / s, and 1.0 m / s, respectively.

[0018] Furthermore, in steps S3 and S4, two tests are performed under each set of test conditions.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The method for measuring the force distribution of the trash net described in the present invention tests the tension of the trash net under the action of water flow and wave current through a tension sensor, simulating the actual situation of the trash net in actual use. This method is used to study the force distribution law of the trash net, and combined with specific environmental conditions and needs, it can optimize the design and improve the production of the later trash net to improve its interception effect and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1This is a schematic diagram of the structure of the trash-blocking net bag suspended on a cable according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation structure of the tension sensor according to an embodiment of the present invention on the trash-blocking net bag;

[0024] Figure 3 This is a schematic diagram of the distribution of tension sensors on four sides of the trash-blocking net bag according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the distribution of tension sensors around the inlet of the trash-blocking net bag according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the distribution of tension sensors on each side of the trash-blocking net bag according to an embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of the variation of the tension of the mesh on each side of the trash-blocking net bag according to the embodiment of the present invention with the flow velocity;

[0028] Figure 7 It is a schematic diagram of the variation of the tension around the inlet of the trash-blocking net bag according to the embodiment of the present invention with the flow velocity;

[0029] Figure 8 It is a schematic diagram of the variation law of the tension applied to the tension sensor on the top surface of the trash-blocking net bag according to an embodiment of the present invention at different flow rates;

[0030] Fig. 9 It is a schematic diagram of the variation of the tension of the tension sensors at the same side of the trash-blocking net bag according to an embodiment of the present invention at different flow rates;

[0031] Fig.10 It is a schematic diagram of the variation law of the tension applied to the tension sensor on the side of the trash-blocking net bag according to an embodiment of the present invention at different flow rates;

[0032] Fig.11 It is a schematic diagram of the variation law of the tension of the tension sensor on the bottom side of the trash-blocking net bag according to an embodiment of the present invention at different flow rates;

[0033] Fig.12 This is a schematic diagram of the variation of the tension around the net opening of the trash-blocking net bag according to the embodiment of the present invention with the flow velocity;

[0034] Fig.13 A schematic diagram of a trajectory formed by the tension sensors on the surface of the trash-blocking net bag in a vertical plane according to an embodiment of the present invention;

[0035] Fig.14It is a schematic diagram of the tension values ​​of the tension sensors at different flow rates when the surface of the trash-blocking net bag according to the embodiment of the present invention is in different vertical planes;

[0036] Fig.15 It is a schematic diagram of the variation law of the tension of the tension sensor according to an embodiment of the present invention under different flow rates in each circle.

[0037] Description of reference numerals:

[0038] 10. Trash net bag; 20. Cable; 30. Float; 40. Tension sensor; 50. Pull rope; 60. Hanging rope. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0041] As shown in the figure, the method for measuring the force distribution of the trash net bag includes the following steps:

[0042] S1. On the four sides of the trash net 10 arranged along the length direction, a plurality of tension sensors 40 are evenly arranged on each side, and a hollow hole is opened on the side of the trash net corresponding to each tension sensor, and the tension sensor is fixedly connected to the middle of the corresponding hollow hole through a plurality of pull ropes 50 in different directions;

[0043] S2. Suspend the inlet side of the trash net bag on the cable 20. In this embodiment, a cable is laid horizontally on the upper and lower sides of the inlet side of the trash net bag, and the four corners of the inlet are suspended on the cables on the corresponding sides through hanging ropes 60, so that the trash net bag is suspended underwater; and both ends of the cable are fixedly connected to a mobile platform, and the mobile platform can move back and forth in a horizontal plane in a direction perpendicular to the cable. For example, the mobile platform can adopt a simple movable gantry crane.

[0044] S3. Conduct a flow rate test, set multiple groups of water flow rates in the range of 0.1m / s to 1.0m / s, test the trash net bag in step S2 at different water flow rates, and obtain the tension value at each tension sensor;

[0045] S4. Conduct a wave and current test, set the water flow speed to 0.1m / s, 0.3m / s and 0.5m / s, the wave height to 0.3m, and the wave period to 4s and 5s respectively, and test the trash net bag in step S2 to obtain the tension value at each tension sensor;

[0046] S5. Analyze the changes in the tension values ​​at various locations of the trash net under different test conditions to obtain the distribution characteristics of the tension on the trash net.

[0047] In step S1, the tension sensors on the same side are evenly distributed in a zigzag shape, which is to reduce the stress concentration problem caused by the tension sensors on the same side and ensure that the tension distribution characteristics of different areas can be effectively captured.

[0048] Tension sensors are arranged at the four top corners and the middle of each side on the inlet side of the trash net bag.

[0049] The pull rope is evenly distributed along the circumference of the tension sensor, one end of the pull rope is fixedly connected to the tension sensor, and the other end is fixedly connected to the edge of the hollow hole.

[0050] A plurality of floating balls 30 are evenly arranged on the upper surface of the trash-blocking net bag, which are used to float the trash-blocking net bag on the water surface.

[0051] In step S3, the water flow velocity is set to 0.1 m / s, 0.2 m / s, 0.3 m / s, 0.4 m / s, 0.5 m / s, 0.7 m / s, and 1.0 m / s respectively.

[0052] In steps S3 and S4, two tests are performed under each set of test conditions to ensure the accuracy of the obtained tension data.

[0053] The test conditions of each group of flow rate test and wave flow test are shown in Table 1-1:

[0054] Table 1-1 Flow rate test and wave flow test conditions

[0055]

[0056]

[0057] In this embodiment, the tension sensor adopts a six-dimensional force sensor, which can accurately measure the force and torque in three spatial directions, provide comprehensive force information, improve sensing accuracy, and reduce measurement errors.

[0058] The following is a specific case of the above test to illustrate the reliability of this solution. The pollution net used in the current nuclear power plant is used as the prototype. The pollution net is tightened from the inlet end to the back, with a length of 8m (here only refers to the length tightened from the inlet end to the back), a net mouth width of 2.2m, and a net tail width of 0.5m. Tension sensors are set on the four sides of the pollution net and around the inlet, such as Figure 3The figure shows the distribution diagram of the tension sensors on the four sides of the trash net bag, wherein the corresponding numbers 2-1, 2-2, 2-3, 2-4, and 2-5 are the distribution positions of the tension sensors on the top side of the trash net bag, the corresponding numbers 2-6, 2-7, 2-8, 2-9, and 2-10 are the distribution positions of the tension sensors on the front and back sides of the trash net bag, and the corresponding numbers 2-11, 2-12, 2-13, 2-14, and 2-15 are the distribution positions of the tension sensors on the bottom side of the trash net bag. Figure 4 The figure shows the distribution diagram of the tension sensors around the inlet of the trash net bag. The numbers 1-1, 1-2, 1-3, 1-4, 1-5, 1-6, 1-7, and 1-8 corresponding to each point are the distribution positions of the tension sensors around the inlet side of the trash net bag. Figure 5 A is a schematic diagram showing the distribution of tension sensors on the bottom side of the trash net, B is a schematic diagram showing the distribution of tension sensors on the front and rear sides of the trash net, and C is a schematic diagram showing the distribution of tension sensors on the top side of the trash net.

[0059] The test was conducted in the following water pool, which is 130 meters long, 18 meters wide, 6 meters deep, and has a maximum working water depth of 5 meters. After the above test conditions were tested in the water pool, the distribution of tension under the action of water flow can be obtained:

[0060] (1) Changes in the tension at the network port

[0061] like Figure 6 The figure shows the variation of mesh tension with flow velocity. The test data shows that as the water flow velocity increases, the tension values ​​measured by the tension sensors on each side of the trash net bag show a significant upward trend. At low flow velocities (0.1m / s to 0.3m / s), the tension value is relatively small and the force of the water flow is limited. As the flow velocity increases to 0.4m / s and above, the tension begins to increase significantly, especially the tension increase measured by the tension sensors on the front, top and bottom sides. Finally, when the flow velocity is 1.0m / s, the tension in some areas reaches the maximum value.

[0062] like Figure 7The figure shows how the tension around the inlet of the trash net changes with the flow rate. As the flow rate increases, the tension at each position shows an upward trend, and this upward trend is nonlinear. Especially when the flow rate reaches 0.7m / s and 1.0m / s, the tension increases significantly, indicating that the force on the mesh increases sharply under high flow rates. The tension at the number 1-1 is always higher than that at other positions at all flow rates, especially when the flow rate reaches 1.0m / s, the tension is close to 300N, which is much higher than other positions. This shows that this position is hit the hardest by the water flow, probably because this position is on the front of the mesh, directly facing the direction of the water flow. At the same time, the tension growth rate at the four corners (numbers 1-1, 1-3, 1-5 and 1-7) is faster than that at the four sides, indicating that these positions are where the tension is concentrated.

[0063] (2) Top side tension distribution characteristics

[0064] like Figure 8 As shown, the tension sensors on the top surface (numbered 2-1, 2-2, 2-3, 2-4, and 2-5) mainly bear the initial impact of the water flow. The results show that the tension distribution on the top surface presents a certain regularity, and the maximum tension occurs at the tension sensor positions at numbers 2-4 and 2-5, reaching 0.9N at a flow rate of 1.0m / s. The overall tension fluctuates between 0N and 1N, and the growth of the tension on the top surface is relatively stable, without obvious force concentration, indicating that the diffusion of the water flow in the top surface area is relatively uniform. And the tension gradually increases from front to back along the net bag. At the same time, the change patterns of the three tension gauges on the upper side and the two tension gauges on the lower side should be analyzed along the path. Fig. 9 The tension variation law of the tension sensor on the same side of the trash net bag at different flow rates. Fig. 9 It can be seen that the tension increases along the same path, that is, the upper side distribution of the top mesh from front to back.

[0065] (3) Side tension distribution characteristics

[0066] like Fig.10As shown in the figure, the tension change law of the tension sensor on the side of the trash net bag at different flow rates, it can be seen that the tension distribution of the tension sensors on the side (numbered 2-6, 2-7, 2-8, 2-9, 2-10) shows a significant difference. In general, the tension performance of the tension sensors at numbers 2-7 and 2-10 at different flow rates is more prominent, especially when the flow rate is 1.0m / s, the tension of the tension sensor at number 2-7 reaches a peak value of about 2.4N, which indicates that the water flow impact at this location is the greatest. The tension sensor at number 2-8 shows a moderate tension value at lower flow rates (such as 0.3m / s and 0.5m / s), while at higher flow rates (such as 1.0m / s), the tension rises sharply, indicating that there may be local eddies or concentrated water flow at this location, resulting in increased tension. The tension changes of the tension sensors at numbers 2-6 and 2-9 are relatively small, and basically remain at a low level at various flow rates, especially when the flow rate is 0.1 m / s to 0.5 m / s, there is almost no significant tension change.

[0067] At the same flow rate, the tension changes of different sensors show similar trends. As the flow rate increases, the tension gradually increases, especially when the flow rate reaches 1.0m / s, the tension increases significantly. Among them, the tension of the tension sensor at number 2-7 reaches the maximum value at 1.0m / s, indicating that the location of the sensor is most significantly affected by the water flow. The tension of the tension sensor at number 2-10 at a flow rate of 1.0m / s is significantly lower than that of the tension sensor at 2-7, which may indicate that the water flow speed in this area has slowed down or the force is more dispersed. In addition, the tension of the tension sensors at numbers 2-6 and 2-9 is smaller at different flow rates, indicating that these areas may be in the secondary force zone of the water flow.

[0068] The tension distribution of the left sensor shows obvious asymmetry, especially the tension fluctuations of the tension sensors at positions 2-7 and 2-10 are large. This phenomenon may be related to the local vortex formed when the water flows through the side of the net bag or the change in the direction of the water flow, resulting in different water flow impact forces at different positions.

[0069] At low and medium flow rates (0.1m / s to 0.5m / s), the tension distribution is relatively uniform, but as the flow rate increases, the interaction between the water flow and the net bag becomes more complex, resulting in a sharp increase in tension at some sensors.

[0070] In general, the higher the flow rate, the greater the tension measured by the sensor, especially at 1.0m / s, the peak tension appears. This shows that under high flow conditions, the impact of the water flow on certain areas on the side of the net bag will be concentrated, resulting in a sharp increase in tension. Therefore, this uneven distribution suggests that when designing and applying net bags, especially in high flow conditions, it is necessary to strengthen the support and reinforcement of the side areas to prevent structural damage caused by excessive local force.

[0071] (4) Bottom side tension distribution characteristics

[0072] like Fig.12 As shown in the figure, the tension changes of the tension sensors at the positions 2-11, 2-12, 2-13, 2-14, and 2-15 on the bottom side of the trash net at different flow rates are quite significant. The tension of the tension sensor at the position 2-13 reaches the maximum value at a high flow rate (1.0m / s), which is close to 3N. This shows that the water flow impact at this position is relatively concentrated. The tension of the tension sensors at the positions 2-11 and 2-12 is relatively small, especially at lower flow rates (such as 0.1m / s and 0.2m / s), the tension is almost zero, indicating that the water flow velocity at these positions is relatively low, or the water flow force is dispersed, resulting in relatively small tension. The tension of the tension sensors at the positions 2-14 and 2-15 increases at high flow rates, especially at 0.7m / s and 1.0m / s, the tension reaches relatively high values, 1.5N and 1.8N respectively, indicating that this area is also subjected to a large water flow impact. Overall, there is a certain degree of unevenness in the distribution of bottom surface tension.

[0073] After conducting a tensile test on the trash screen model, the following rules were summarized:

[0074] like Fig.12 As shown in the figure, the tension around the net mouth of the trash net changes with the flow rate. The distribution characteristics of the tension at the net mouth are as follows. The overall tension changes with the flow rate: as the water flow rate increases, the tension at each position of the net bag shows an increasing trend. At low flow rates, the tension is small; when the flow rate reaches 0.4m / s and above, the tension at the net mouth increases significantly. The tension on the front side is the largest, followed by the top. The results show that the tension sensors on the front side (such as those marked 1-1, 1-3, 1-5 and 1-7) withstand the strongest water flow impact. The above four tension sensors are arranged at the four corners of the net mouth. At a flow rate of 1.0m / s, the tension on the front side is as high as 272.6N. The top is second, but it still shows a large increase in tension. As the flow velocity increases, the tension at the four corners is significantly greater than that at the four sides, indicating that the tension under the action of the water flow is concentrated at the four corners of the mesh. This phenomenon becomes more and more obvious as the flow velocity increases. It is relatively uniform at 0.1m / s, and shows an inward concave pattern at a flow velocity of 1m / s.

[0075] The overall tension change law at different positions: The tension on the bottom side is unevenly distributed, especially at the numbers 2-13, 2-14 and 2-15 near the end, showing a significant tension concentration phenomenon, indicating that the bottom end area is subjected to a large water flow impact. The tension on the side and top sides is smaller than the tension value of the tension sensor at the mesh mouth, indicating that these areas are relatively less impacted by the water flow and the tension distribution is relatively uniform.

[0076] like Fig.13The figure shows the trajectory formed by the tension sensors on the surface of the trash net bag in the corresponding vertical plane. Fig.14 for Fig.13 From the tension values ​​of each tension sensor at different flow rates, we can see that as the flow rate increases, the tension at the mesh mouth increases sharply, especially when the flow rate reaches 1.0m / s, the tension at the mesh mouth exceeds 1500N, which is much higher than the tension values ​​of other circles. This shows that the mesh mouth is hit the most by the water flow and the tension it bears is dominant.

[0077] It can be seen that the tension values ​​of the first to fifth circles are relatively small, and the difference between the layers is not large. The tension shows a slow upward trend with the increase of flow rate. When the flow rate is 0.1m / s to 0.5m / s, the tension of each layer does not change significantly, indicating that when the water flows through the net bag, the tension transmission gradually becomes stable, and the impact force is mainly concentrated near the net mouth.

[0078] like Fig.15 The figure shows the change of tension of the tension sensor of each circle at different flow rates. It can be seen that at different flow rates, the tension at the mesh mouth is always much higher than that at other circle positions, especially at high flow rates (1.0m / s), the mesh mouth tension reaches a significant peak, while the tension at other circle positions changes slightly. This shows that under high flow conditions, the water flow mainly acts on the inlet end of the net bag, and as the water flows deeper into the net bag, the tension transmission gradually decays. The tension distribution at each circle position is relatively consistent, and the change of tension value at different flow rates is relatively small, especially from the third to the fifth circle, the tension change tends to be stable, indicating that the impact of the water flow on these positions is weak.

[0079] At the same time, it can be seen that under low flow conditions (such as 0.1m / s and 0.2m / s), the tension at the mesh mouth is not much different from the tension of each circle. As the flow rate increases, the tension at the mesh mouth increases rapidly, especially when the flow rate is 1.0m / s, the tension difference is most significant. Under high flow rates, the tension at the mesh mouth increases rapidly, while the tension values ​​from the first circle to the fifth circle are relatively stable and have no obvious changes, which shows that the influence of water flow on the mesh mouth position is far greater than that on other circles.

[0080] The tension at the mesh mouth increases significantly: When the flow rate increases, the tension at the mesh mouth increases rapidly, especially at high flow rates, the mesh mouth tension accounts for the vast majority of the total tension, indicating that the main force of the water flow is concentrated at the front end of the net bag, and the pressure at the mesh mouth is the greatest.

[0081] The tension of each circle is evenly distributed: from the first circle to the fifth circle, the tension value of each circle changes relatively little, indicating that the impact force of the water flow gradually weakens after passing through the net mouth, and the tension is distributed evenly inside the net bag without significant difference.

[0082] Gradually attenuated tension transmission: As the flow rate increases, the tension is gradually transmitted and attenuated inside the net bag, especially under high flow conditions, the tension is mainly concentrated at the net mouth and the first circle, and then gradually decreases. This law of tension transmission shows that the force structure of the net bag in the water flow can cope with most of the impact force by strengthening the design of the net mouth and the material selection.

[0083] By conducting targeted tensile tests on the trash net model, the above rules and conclusions were obtained, which can effectively assist the production of the actual trash net. For places where the tensile force is more concentrated, the production process can be reinforced to extend the overall service life of the trash net.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring the force distribution of a trash net bag, characterized in that: The following steps are involved: S1. On the four sides of the trash-blocking net bag along the length direction, multiple tension sensors are evenly arranged on each side, and a hollow hole is opened on the side of the trash-blocking net bag corresponding to each tension sensor, and the tension sensor is fixedly connected to the middle of the corresponding hollow hole through multiple pull ropes in different directions; S2. Suspend the inlet side of the trash net bag on the cable; S3. Conduct a flow rate test, set multiple groups of water flow rates in the range of 0.1m / s to 1.0m / s, test the trash net bag in step S2 at different water flow rates, and obtain the tension value at each tension sensor; S4. Conduct a wave and current test, set the water flow speed to 0.1m / s, 0.3m / s and 0.5m / s, the wave height to 0.3m, and the wave period to 4s and 5s respectively, and test the trash net bag in step S2 to obtain the tension value at each tension sensor; S5. Analyze the changes in the tension values ​​at various locations of the trash net under different test conditions to obtain the distribution characteristics of the tension on the trash net.

2. The method for measuring the force distribution of a trash net bag according to claim 1 is characterized in that: In step S1, the tension sensors on the same side are evenly distributed in a zigzag shape.

3. The method for measuring force distribution of a trash net bag according to claim 1 is characterized in that: Tension sensors are arranged at the four top corners and the middle of each side on the inlet side of the trash net bag.

4. The method for measuring force distribution of a trash net bag according to claim 1 is characterized in that: The pull rope is evenly distributed along the circumference of the tension sensor, one end of the pull rope is fixedly connected to the tension sensor, and the other end is fixedly connected to the edge of the hollow hole.

5. The method for measuring force distribution of a trash net bag according to claim 1 is characterized in that: A plurality of floating balls are evenly arranged on the upper surface of the trash-blocking net bag.

6. The method for measuring force distribution of a trash net bag according to claim 1 is characterized in that: In step S3, the water flow velocity is set to 0.1 m / s, 0.2 m / s, 0.3 m / s, 0.4 m / s, 0.5 m / s, 0.7 m / s, and 1.0 m / s respectively.

7. The method for measuring force distribution of a trash net bag according to claim 1, characterized in that: In steps S3 and S4, two tests are performed under each set of test conditions.

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