Resistance tester with buffer clamping mechanism for ship resistance towing test

Abstract

The invention relates to the field of ship sailing performance tests, and provides a resistance tester with a buffer clamping mechanism for a ship resistance towing test, the resistance tester comprises a rack, a towing assembly, a heading assembly and a measuring assembly, the rack is installed on a test trailer main body structure, the towing assembly and the heading assembly are respectively installed at the front end and the rear end of the rack, and the measuring assembly is installed on the towing assembly. And the two measuring assemblies are respectively arranged at the lower ends of the dragging assembly and the course assembly and are connected with the ship model. The resistance tester has certain dragging rigidity, can restrain and restrain up-down and left-right shaking generated in the dragging process of the ship model, effectively maintains the position and posture of the ship model, can adapt to ship models of different sizes, flexibly adjusts the position and height of a dragging point on the ship model, and has good application prospects in dragging tests with navigation angles. And the ship model can keep a stable and accurate sailing angle with the driving direction of the test trailer in the test, the stability is good, the precision is high, and the service life is long.

Description

Technical Field

[0001] The present invention relates to the field of ship navigation performance tests, and particularly to a drag tester with a buffer clamping mechanism for ship resistance towing tests. Background Art

[0002] During the ship design process, the ship resistance test is a basic test item in the study of ship hydrodynamic performance. As the core equipment in the ship resistance test, the drag tester is generally installed on a test trailer running above a pool. Its towing device fixes the test ship model. Generally, a force sensor is installed in the towing device to measure the towing force of the drag tester for towing the ship model. The operation of the test trailer generally includes an acceleration stage, a constant-speed stage, and a deceleration stage. The drag tester generally collects the towing force during the constant-speed stage. At this time, the towing force of the drag tester is basically equal to the navigation resistance of the ship model. Therefore, by measuring the towing force with a collection computer, the navigation resistance of the ship model can be obtained.

[0003] Due to the influence of acceleration, the force sensor of the drag tester is often subjected to a force from the ship model along the movement direction that is greater than the measurement range of the sensor during the acceleration and deceleration of the test trailer. Therefore, the drag tester generally is equipped with a tightening mechanism to limit the relative movement freedom between the drag tester and the ship model to prevent damage to the sensor. However, since the action of the tightening mechanism has a certain impact on the force sensor and its attached structures, it may affect the measurement accuracy of the force sensor and even damage the force sensor, thereby causing the drag tester to malfunction, greatly affecting its accuracy and service life. Therefore, it is necessary to make improvements. Summary of the Invention

[0004] To make up for the deficiencies of the prior art, the present invention provides a drag tester with a buffer clamping mechanism for ship resistance towing tests. The tester has a certain towing rigidity, can restrain and suppress the up-and-down and left-and-right shaking of the ship model during towing, effectively maintain the position and attitude of the ship model, can adapt to ship models of different sizes, flexibly adjust the position and height of the towing point on the ship model. For towing tests with a navigation angle, it can also make the ship model maintain a stable and accurate navigation angle with the driving direction of the test trailer during the test, with good stability, high accuracy, and long service life.

[0005] The present invention discloses a drag tester with a buffer clamping mechanism for ship resistance towing tests, including a frame, a towing assembly, a course assembly, and a measurement assembly. The frame is fixed to the main structure of the test trailer. The towing assembly and the course assembly are respectively installed at the head and tail of the frame. Two measurement assemblies are respectively installed at the lower ends of the towing assembly and the course assembly and are connected to the towing points of the ship model, capable of providing two towing positions.

[0006] The frame is welded by rectangular square steel pipes and is fixed to the test trailer during use, serving as an installation and support for each component. The towing assembly is installed at the front of the frame and mainly includes a towing rod, a head crossbeam, and a first adjustment seat. The heading assembly is installed at the rear of the frame and mainly consists of a heading rod, a tail crossbeam, a second adjustment seat, and a guiding mechanism. The measuring assembly is respectively installed at the lower ends of the towing rod and the heading rod and can be connected to the towing points of the ship model.

[0007] According to the resistance tester with a buffer clamping mechanism for ship resistance towing tests disclosed by the present invention, preferably, the towing assembly includes a towing rod, a head crossbeam, and a first adjustment seat. The towing rod can be fixed on the head crossbeam through the first adjustment seat, and the towing rod can rotate around the center of the first adjustment seat and can adjust the length of the downward extension.

[0008] In the towing assembly of the present invention, the towing rod is installed in the first adjustment seat equipped with a thrust bearing and is fixed to the bushing of the first adjustment seat through an adjustment screw. By screwing the adjustment screw into the positioning holes at different positions on the towing rod, the towing rod can rotate around its own axis and can also change the length of the downward extension of the towing rod through the positioning of the adjustment screw.

[0009] According to the resistance tester with a buffer clamping mechanism for ship resistance towing tests disclosed by the present invention, preferably, the heading assembly includes a heading rod, a tail crossbeam, a second adjustment seat, a longitudinal guiding mechanism, and a transverse guiding mechanism. The heading rod is fixed to the tail crossbeam through the second adjustment seat, and the heading rod can rotate around the center of the second adjustment seat and can adjust the length of the downward extension. The longitudinal guiding mechanism and the transverse guiding mechanism are used to adjust the horizontal position of the heading rod.

[0010] In the heading assembly of the present invention, the heading rod is installed in the second adjustment seat with the same structure. A transverse guiding mechanism is installed between the second adjustment seat and the tail crossbeam. The guide rail and slider of the guiding mechanism enable the adjustment seat to move along the tail crossbeam in the transverse direction (i.e., perpendicular to the towing direction), and the position of the adjustment seat can be changed and maintained through a servo motor, a lead screw, and a nut. A longitudinal guiding mechanism is installed between the tail crossbeam and the frame, and its structure and principle are basically the same as those of the transverse guiding mechanism. Therefore, in addition to being able to rotate around its own axis and change the length of the downward extension, the heading rod can also change its position in the transverse and longitudinal directions (parallel to the towing direction) through the transverse guiding mechanism and the longitudinal guiding mechanism.

[0011] According to the resistance tester for ship resistance tests disclosed by the present invention, preferably, the measuring assembly includes an upper connecting plate, a lower connecting plate, a guiding mechanism, and a force sensor;

[0012] One end of the upper connecting plate is connected to the lower part of the towing rod, and the other end of the upper connecting plate is connected to the lower part of the heading rod. The lower connecting plate is connected to the ship model. Both ends of the guiding mechanism are respectively connected to the upper connecting plate and the lower connecting plate. Both ends of the force sensor are respectively connected to the upper connecting plate and the lower connecting plate.

[0013] For the drag tester with a buffer clamping mechanism for ship resistance towing tests disclosed by the present invention, preferably, the guiding mechanism includes a polished rod, a slider, a support and a bracket; the polished rod is installed on the upper connecting plate through the support, the slider is installed on the lower connecting plate through the bracket, and the upper connecting plate and the lower connecting plate can slide along the length direction of the polished rod.

[0014] For the drag tester with a buffer clamping mechanism for ship resistance towing tests disclosed by the present invention, preferably, the measuring assembly further includes a stopper and a buffer mechanism; the stopper includes a cylinder and a multi-link mechanism. When the cylinder extends, it can drive the multi-link mechanism to act, so that the end of the end link presses against the buffer plate, and a roller is also installed on the end link; the buffer mechanism includes a buffer plate and a damper. Two stoppers are provided on each measuring assembly, and the two stoppers are installed on the upper connecting plate in a "head-to-head" form facing each other; two buffer plates are provided on each measuring assembly, and the two buffer plates are connected to the lower connecting plate through dampers and brackets in a "back-to-back" form. When the two stoppers perform the clamping action, the two buffer plates will be squeezed in the opposite direction at the same time. At this time, the clamping impact force is offset by the damping force of the damper, absorbing the instantaneous impact caused by the clamping action on the force sensor between the upper connecting plate and the lower connecting plate. When the damper is compressed to the maximum stroke by the stopper, the stopper does not move to the maximum stroke, and the buffer plate is in a rigid contact state with the lower connecting plate. After the stopper retracts, the damper drives the buffer plate to reset under the action of the spring force to ensure the buffer effect when the stopper acts next time.

[0015] The measuring assembly of the present invention includes an upper connecting plate, a lower connecting plate, a guiding mechanism, a stopper, a buffer mechanism and a force sensor. The measuring assembly is installed at the lower ends of the towing assembly and the heading assembly. The upper connecting plate is connected to the towing rod and the heading rod, and the lower connecting plate is connected to the ship model, providing two towing points for the ship model in total. The guiding mechanism is installed between the upper connecting plate and the lower connecting plate, enabling the two to move freely in the direction of the polished rod of the guiding mechanism and restricting the degrees of freedom of movement in other directions.

[0016] The stopper is connected to the upper connecting plate, and the buffer mechanism is connected to the lower connecting plate. The stopper performs the clamping action by relying on compressed air. The buffer mechanism includes a damper with a spring reset function and a buffer plate connected to the damper, which is connected to the lower connecting plate. The damper has a certain compression stroke, which is greater than the clamping stroke of the stopper to ensure complete clamping. When the stopper performs the clamping action, due to the damping effect of the damper, the clamping force of the stopper on the lower connecting plate gradually increases to the maximum value. When the damper is compressed to the maximum stroke, the stopper completely clamps the lower connecting plate, restricting all degrees of freedom of movement between the upper connecting plate and the lower connecting plate.

[0017] According to the resistance tester with a buffer clamping mechanism for ship resistance towing tests disclosed by the present invention, preferably, the force sensor includes a sensor body, an upper connecting seat, and a lower connecting seat; the sensor body is a uniaxial tension-compression sensor. During the stage when the test trailer is traveling at a constant speed, after the stopper retracts, the towing force of the test trailer and the navigation resistance of the ship model can act on both ends of the sensor body respectively. At this time, the force value of the sensor body collected by the collector is the navigation resistance of the ship model.

[0018] The force sensor is a uniaxial tension-compression sensor, and its two ends are respectively connected to the upper connecting plate and the lower connecting plate. When the test trailer is in the uniform speed stage and the stopper is released, at this time, the force sensor can measure the tension or pressure between the upper connecting plate and the lower connecting plate, and the collector sends the signal to the acquisition computer.

[0019] The realization of the buffer clamping function of the present invention: There are two stoppers on each measurement component, which are installed on the upper connecting plate in a "head-to-head" form. The stopper is composed of a cylinder and a multi-link mechanism. When the cylinder extends, it can drive the multi-link mechanism to act, so that the end of the end link presses against the buffer plate. To reduce friction, rollers are installed on the end link. There are two buffer plates on each measurement component, which are connected to the lower connecting plate through dampers and brackets in a "back-to-back" form. When the two stoppers perform the clamping action, they will simultaneously squeeze the two buffer plates in the opposite direction. At this time, the clamping impact force is offset by the damping force of the damper, avoiding the instantaneous impact on the force sensor between the upper connecting plate and the lower connecting plate caused by the clamping action. When the damper is compressed to the maximum stroke, the buffer plate and the lower connecting plate are in rigid contact. At this time, the stopper has not yet moved to the maximum stroke, so there is still enough clamping force on the buffer plate, which can maintain a reliable clamping state during the acceleration and deceleration stages of the test trailer, preventing the force sensor from being damaged due to exceeding the load limit. After the stopper retracts, the damper can drive the buffer plate to reset under the action of the spring force to ensure the buffer effect when the stopper acts next time.

[0020] Implementation of the control function for the pose of the ship model: By moving the tail crossbeam on the course component through a servo motor and moving the adjusting seat on the tail crossbeam through a servo motor, the positions of the course rod in the longitudinal and transverse directions can be changed respectively to meet the requirements of different lengths of ship models and different course angles for the position of the towing point. The self-locking effect of the lead screw and nut can keep the position of the course rod fixed; by screwing the adjusting screw into the positioning holes at different positions on the towing rod and the course rod, the lengths of the towing rod and the course rod extending downward can be changed to meet the requirements of the height of the towing point or the draft depth of the ship model in different ship resistance tests, and the movement trend of the ship model in the up and down directions can be restricted.

[0021] The resistance tester for ship resistance towing test provided by the present invention has the following ship resistance test process: (1) Determine the position of the towing point of the ship model according to the test requirements, screw the adjusting screw into the appropriate positioning hole, determine the lengths of the towing rod and the course rod extending downward, make the lower connecting plate of the measuring component at the same height as the towing point position of the ship model, and connect the lower connecting plate at the lower end of the towing rod of the measuring component to the corresponding towing point of the ship model; (2) Adjust the positions of the course rod in the transverse and longitudinal directions through a servo motor to make the lower connecting plate of the measuring component below the course rod coincide with the corresponding towing point position of the ship model, and connect the lower connecting plate to this towing point; (3) Start the resistance tester. At this time, the collector and the acquisition computer start to run. The stopper in the measuring component clamps the buffer plate, compresses the damper to the maximum stroke, and the clamping force reaches the maximum value; (4) Start the test trailer, and the test trailer accelerates to the set driving speed; (5) When the test trailer enters the uniform driving stage, the stopper in the measuring component retracts. At this time, the upper and lower connecting plates of the measuring component can move freely in the direction of the optical bar of the guiding mechanism. At this time, the force sensor is respectively subjected to the towing force of the upper connecting plate and the ship model navigation resistance of the lower connecting plate, and the two are equal in magnitude and opposite in direction; (6) The collector collects the signal of the force sensor and transmits it to the acquisition computer for analysis and storage; (7) After the acquisition process ends, the stopper in the measuring component clamps the buffer plate again; (7) The test trailer enters the deceleration stage until it stops, and the ship resistance towing test process ends.

[0022] The beneficial effects of the present invention at least include:

[0023] (1) The stopper of the measuring component is a pair of multi-link mechanisms driven by cylinders. When the cylinders act, they push the two groups of multi-link mechanisms to move towards each other, directly stop and limit the upper and lower connecting plates fixed with sensors. Compared with the design of using a clamping brake mechanism for stop and limit in the prior art, on the one hand, it can greatly reduce the structural volume while ensuring the stiffness, and on the other hand, it overcomes the situation that the stop and limit effect decreases due to the decrease of the friction force caused by the water ingress of the clamping brake mechanism in the prior art, and improves the reliability of the stop and limit.

[0024] (2) A damper with a reset function is installed on the lower connecting plate in the measurement assembly, which can provide a buffering effect when the stopper clamps the connecting plate, offsetting the impact caused by the clamping of the stopper. At the same time, in the design, it is considered that when the damper is compressed to its maximum stroke, the stopper has not yet reached its maximum range, so the clamping effect of the stopper can be ensured.

[0025] (3) Compared with the single-group clamping mechanism design used in the prior art, considering the development trend of large-scale ship model towing tests, stoppers are installed in the measurement assemblies at both towing points in the present invention, ensuring the stopper limit effect on the ship model by the resistance tester during the acceleration and deceleration stages of the test trailer.

[0026] (4) A large-range single-axis tension-compression sensor is installed in the measurement assembly as a force sensor, which can meet the measurement requirements for the navigation resistance of large-scale ship models, and can measure the navigation resistance of the ship model when the test trailer travels forward and backward. The measurement position of the sensor basically coincides with the towing point, and the additional mass attached to the ship model is small, improving the measurement accuracy of the ship model resistance in the test.

[0027] (5) A guiding mechanism composed of a light bar, a slider and a support is used in the measurement assembly. The direction of the light bar is parallel to the force direction received by the sensor, enabling the upper connecting plate and the lower connecting plate to move only along the direction of the light bar, meeting the requirement for the accuracy of the force direction during the measurement of the force sensor.

[0028] (6) The course assembly is equipped with a longitudinal adjustment mechanism and a transverse adjustment mechanism. The position of the course rod can be adjusted through a servo motor to meet the test requirements for different-sized model ships and different course angles.

[0029] (7) The longitudinal adjustment mechanism of the course assembly is connected to the frame, and the transverse adjustment mechanism is connected to the tail crossbeam in the form of double-sided guide rails and sliders, ensuring the stiffness of the overall structural connection. The transmission structure composed of a servo motor, a lead screw and a nut ensures the accuracy of the position adjustment of the course rod.

[0030] (8) A resistance tester with a buffer clamping mechanism for ship resistance towing tests provided by the present invention can flexibly adjust the towing position of the ship model according to test requirements and ship model sizes, expanding the application range of towing tests.

[0031] (9) The towing point positions of the towing assembly and the course assembly can be adjusted to adapt to ship resistance tests with different draft depths, different course angles and different ship model lengths. The guiding mechanism included in the measurement assembly enables the tension-compression sensor to stably measure the navigation resistance of the ship model. The stopper can prevent excessive external forces from acting on both ends of the sensor during the acceleration and deceleration stages of the test trailer, and the buffer mechanism can absorb the impact force of the stopper clamping through a damper to prevent damage to the sensor.

[0032] (10) The stopper and the buffer mechanism of the measuring component cooperate with each other. The stopper mechanism composed of the stopper uses a cylinder to drive a multi-link mechanism, which is small in size and large in rigidity. During the acceleration and deceleration of the test trailer, it can reliably stop and limit the upper and lower connecting plates on which the sensor is installed, effectively preventing the sensor from being overstressed and exceeding the load limit and being damaged. At the same time, the buffer mechanism can effectively reduce the impact on the force sensor caused by the stopper during the clamping action through the damping effect, further ensuring that the force sensor is not easily damaged and guaranteeing the working stability, accuracy and service life of the drag tester. Description of the Drawings

[0033] Figure 1 This is the assembly drawing of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0034] Figure 2 This is the assembly drawing of the towing component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0035] Figure 3 This is the assembly drawing of the heading component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0036] Figure 4 This is the assembly drawing of the adjustment seat of the heading component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0037] Figure 5 This is the assembly drawing of the longitudinal adjustment mechanism of the heading component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0038] Figure 6 This is the assembly drawing of the lateral adjustment mechanism of the heading component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0039] Figure 7 This is the assembly drawing of the measuring component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0040] Figure 8 This is the internal structure drawing of the measuring component of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0041] Figure 9 This is the schematic diagram of the retracted state of the stopper of a drag tester with a buffer clamping mechanism for ship resistance towing tests according to the present invention.

[0042] Figure 10Schematic diagram of the stopper clamping state of the drag tester with a buffer clamping mechanism for ship resistance towing test of the present invention. Detailed implementation mode

[0043] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation modes. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the limitations of the specific embodiments disclosed below.

[0044] See Figures 1 to 10 , the present invention discloses a drag tester with a buffer clamping mechanism for ship resistance towing test, including a frame 1, a towing assembly 2, a course assembly 3 and a measurement assembly 4. The frame 1 is welded by rectangular square steel pipes and is connected to a pool test trailer, providing installation and support for other components of the drag tester.

[0045] The towing assembly 2 is fixed to the front end of the frame 1, used to fix the position of the bow of the ship model and bear the towing force in the test, including a towing rod 21, a bow cross beam 22 and a first adjustment seat 23. The bow cross beam 22 is connected to the frame 1, and the first adjustment seat 23 is installed on the bow cross beam 22. The towing rod 21 is installed on the first adjustment seat 23, and the lower end is connected to the measurement assembly 4.

[0046] The first adjustment seat 23 includes a towing rod bushing 231, a towing rod bearing seat 232, a thrust bearing 233 and an adjustment screw 234. The towing rod bearing seat 232 is fixed on the bow cross beam 22. The towing rod bushing 231 is installed in the towing rod bearing seat 232 through two thrust bearings 233, so that the towing rod bushing 231 can only rotate around its own axis and cannot move in the height direction. The towing rod 21 passes through the towing rod bushing 231, and a series of equally spaced positioning holes are drilled on the side of the towing rod 21. By changing the position of the adjustment screw 234 screwed into the positioning hole of the towing rod 21, the length of the towing rod 21 extending downward can be changed.

[0047] The course assembly 3 is fixed to the rear end of the frame 1, used to fix the position of the stern of the ship model 5, bear the towing force in the test together with the towing assembly 2, and can adjust the course angle of the ship model 5 in the test. The course assembly 3 includes a course rod 31, a tail cross beam 32, a second adjustment seat 33, a longitudinal guiding mechanism 34 and a transverse guiding mechanism 35. The course rod 31 is installed on the second adjustment seat 33, and the lower end is connected to the measurement assembly 4.

[0048] The second adjusting seat 33 includes a heading rod bushing 331, a heading rod bearing seat 332, a thrust bearing 333 and an adjusting screw 334. The heading rod bearing seat 332 is fixed on the tail cross beam 32. The heading rod bushing 331 is installed in the heading rod bearing seat 332 through two thrust bearings 333, enabling the heading rod bushing 331 to only rotate around its own axis and being immovable in the height direction. The heading rod 31 passes through the heading rod bushing 331, and a series of equally spaced positioning holes are drilled on the side of the heading rod 31. By changing the position of the adjusting screw 334 screwed into the positioning holes of the heading rod 31, the length of the heading rod 31 extending downward can be changed.

[0049] The longitudinal guiding mechanism 34 includes a lead screw 341, a nut 342, a guide rail 343, a slider 344, a Z-shaped frame 345, a bearing support 346 and a servo motor 347. The lead screw 341, the guide rail 343 and the bearing support 346 are installed on the frame 1. The tail cross beam 32 is fixed together with the nut 342, the slider 344 and the Z-shaped frame 345. The lead screw 341 and the nut 342, the guide rail 343 and the slider 344 form two pairs of linear motion pairs. Driven by the servo motor 347, the tail cross beam 32 can reciprocate longitudinally along the guide rail 343 driven by the nut 342, realizing the adjustment of the longitudinal position of the heading rod 31.

[0050] The transverse guiding mechanism 35 includes a lead screw 351, a nut 352, a guide rail 353, a slider 354, a U-shaped frame 355, a bearing support 356 and a servo motor 357. The lead screw 351, the guide rail 353 and the bearing support 356 are installed on the tail cross beam 32. The second adjusting seat 33, the nut 352 and the slider 354 are installed on the U-shaped frame 355. The lead screw 351 and the nut 352, the guide rail 353 and the slider 354 form two pairs of linear motion pairs. Driven by the servo motor 357, the adjusting seat 33 can reciprocate transversely along the guide rail 353 driven by the nut 352, realizing the adjustment of the transverse position of the heading rod 31.

[0051] The described measuring assembly 4 includes an upper connecting plate 41, a lower connecting plate 42, a guiding mechanism 43, a stopper 44, a buffering mechanism 45 and a force sensor 46. The upper connecting plates 41 of the two measuring assemblies 4 are bolted to the lower parts of the towing rod 21 and the heading rod 31, and the lower connecting plates 42 are bolted to the ship model 5.

[0052] The guiding mechanism 43 includes a smooth rod 431, a slider 432, a support 433 and a bracket 434. The smooth rod 431 is installed on the upper connecting plate 41 through the support 433. The slider 432 is installed on the lower connecting plate 42 through the bracket 434. The smooth rod 431 and the slider 432 form a pair of linear motion pairs, enabling the upper connecting plate 41 and the lower connecting plate 42 to slide along the direction of the smooth rod 431.

[0053] The buffer mechanism 45 consists of a buffer plate 451 and a damper 452. There are two stoppers 44 on each measuring component 4, which are installed on the upper connecting plate 41 in a "head-to-head" form facing each other. The stopper 44 consists of a cylinder and a multi-link mechanism. When the cylinder extends, it can drive the multi-link mechanism to act, so that the end of the end link presses against the buffer plate 451. To reduce friction, rollers are installed on the end link. There are two buffer plates 451 on each measuring component 4, which are connected to the lower connecting plate 42 in a "back-to-back" form through the damper 452 and the bracket 434. When the two stoppers 44 perform the clamping action, they will simultaneously squeeze the two buffer plates 451 in the opposite direction. At this time, the clamping impact force is offset by the damping force of the damper 452, avoiding the instantaneous impact caused by the clamping action on the force sensor 46 between the upper connecting plate 41 and the lower connecting plate 42. When the damper 452 is compressed to the maximum stroke, the buffer plate 451 and the lower connecting plate 42 are in a rigid contact state. At this time, the stopper 44 has not yet moved to the maximum stroke, so there is still enough clamping force on the buffer plate 451, which can maintain a reliable clamping state during the acceleration and deceleration stages of the test trailer, preventing the force sensor 46 from being damaged due to exceeding the load limit. After the stopper 44 retracts, the damper 452 can drive the buffer plate 451 to reset under the action of the spring force to ensure the buffer effect when the stopper 44 acts next time. The force sensor 46 is a single-axis tension and compression sensor, including a sensor body 461, an upper connecting seat 462 and a lower connecting seat 463. The two ends of the upper connecting seat 462 are respectively connected to the upper connecting plate 41 and the sensor body 461 by bolts. The two ends of the lower connecting seat 463 are respectively connected to the lower connecting plate 42 and the sensor body 461 by bolts. During the uniform driving stage of the test trailer, after the stopper 44 retracts, when the upper connecting plate 41 and the lower connecting plate 42 can move relative to each other along the direction of the optical bar 431, the towing force of the test trailer and the navigation resistance of the ship model act on both ends of the sensor body 461 respectively. The two forces are equal in magnitude and opposite in direction. At this time, the force value of the sensor body 461 collected by the collector is the navigation resistance of the ship model.

[0054] The large-range resistance tester for ship resistance towing test provided by the present invention, the ship resistance test process:

[0055] ① Determine the position of the towing point of the ship model according to the test requirements, screw the adjusting screw into the appropriate positioning hole, determine the downward extension lengths of the towing rod 21 and the course rod 31, so that the height of the lower connecting plate 42 of the measuring component 4 is the same as the position of the towing point of the ship model, and connect the lower end of the towing rod 21 to the corresponding towing point of the lower connecting plate 42 of the measuring component 4 and the ship model;

[0056] ② Adjust the positions of the course rod 31 in the horizontal and vertical directions through the servo motor, so that the lower connecting plate 42 of the measuring component 4 below the course rod 31 coincides with the position of the corresponding towing point of the ship model, and connect the lower connecting plate 42 to this towing point;

[0057] ③ Start the resistance tester. At this time, the collector and the acquisition computer start to run, and the stopper 44 in the measuring assembly 4 clamps the buffer plate 451.

[0058] ④ Start the test trailer, and the test trailer accelerates to the set driving speed.

[0059] ⑤ After the test trailer enters the uniform driving stage, the stopper 44 in the measuring assembly 4 retracts. At this time, the upper connecting plate 41 and the lower connecting plate 42 of the measuring assembly 4 can move freely in the direction of the optical bar 431 of the guiding mechanism 43. At this time, the two ends of the force sensor 46 are respectively subjected to the dragging force of the upper connecting plate 41 and the ship model navigation resistance of the lower connecting plate 42, and the two are equal in magnitude and opposite in direction.

[0060] ⑥ The collector collects the signal of the force sensor 46 and transmits it to the acquisition computer for analysis and storage. After the acquisition process is completed, the stopper 44 in the measuring assembly 4 clamps the buffer plate 451 again.

[0061] ⑦ The test trailer enters the deceleration stage until it stops, and the ship resistance towing test process ends.

Claims

1. A resistance tester with a buffer clamping mechanism for ship resistance towing test, characterized in that: include: The invention relates to a frame (1), a towing assembly (2), a heading assembly (3) and a measuring assembly (4). The frame (1) is fixed on the main structure of the test trailer. The towing assembly (2) and the heading assembly (3) are respectively installed at the head and tail of the frame (1). Two measuring assemblies (4) are respectively installed at the lower ends of the towing assembly (2) and the heading assembly (3) and are connected to the towing points of the ship model, so as to provide two towing points.

2. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 1, characterized in that: The towing assembly (2) comprises a towing rod (21), a front cross beam (22) and a first adjustment seat (23). The towing rod (21) is fixed to the front cross beam (22) via the first adjustment seat (23). The towing rod (21) can rotate around the center of the first adjustment seat (23) and can adjust the length of the downward extension.

3. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 1, characterized in that: The heading assembly (3) comprises a heading rod (31), a tail beam (32), a second adjustment seat (33), a longitudinal guide mechanism (34) and a transverse guide mechanism (35); the heading rod (31) is fixed to the tail beam (32) via the second adjustment seat (33); the heading rod (31) can rotate around the center of the second adjustment seat (33) and can adjust the length of the downward extension; the longitudinal guide mechanism (34) and the transverse guide mechanism (35) are used to adjust the horizontal position of the heading rod (31).

4. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 1, characterized in that: The measuring assembly (4) comprises an upper connecting plate (41), a lower connecting plate (42), a guide mechanism (43) and a force sensor (46); One end of the upper connecting plate (41) is connected to the lower part of the towing rod (21), the other end of the upper connecting plate (41) is connected to the lower part of the heading rod (31), the lower connecting plate (42) is connected to the ship model, the two ends of the guide mechanism (43) are respectively connected to the upper connecting plate (41) and the lower connecting plate (42), and the two ends of the force sensor (46) are respectively connected to the upper connecting plate (41) and the lower connecting plate (42).

5. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 4, characterized in that: The guide mechanism (43) comprises a light bar (431), a sliding block (432), a support (433) and a bracket (434); the light bar (431) is mounted on the upper connecting plate (41) via the support (433), the sliding block (432) is mounted on the lower connecting plate (42) via the bracket (434), and the upper connecting plate (41) and the lower connecting plate (42) can slide along the length direction of the light bar (431).

6. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 4 or 5, characterized in that: The measuring assembly (4) further comprises a stopper (44) and a buffer mechanism (45); the stopper (44) comprises a cylinder and a multi-link mechanism, and when the cylinder is extended, the multi-link mechanism can be driven to move so that the end of the terminal link is pressed against the buffer plate (451), and a roller is also installed on the terminal link; the buffer mechanism (45) comprises a buffer plate (451) and a damper (452), and each measuring assembly (4) is provided with two stoppers (44), and the two stoppers (44) are installed on the upper connecting plate (41) in a "head-to-head" manner; each measuring assembly (4) is provided with two buffer plates (451), and the two buffer plates (451) are connected to the lower connecting plate in a "back-to-back" manner through the damper (452) and the bracket (434). (42) are connected. When the two stoppers (44) perform the clamping action, the two buffer plates (451) are squeezed in the opposite direction at the same time. At this time, the clamping impact force is offset by the damping force of the damper (452), absorbing the instantaneous impact caused by the clamping action on the force sensor (46) between the upper connecting plate (41) and the lower connecting plate (42). When the damper (452) is compressed to the maximum stroke by the stopper (44), the stopper (44) does not move to the maximum stroke, and the buffer plate (451) and the lower connecting plate (42) are in a rigid contact state. After the stopper (44) is retracted, the damper (452) drives the buffer plate (451) to reset under the action of the spring force to ensure the buffering effect when the stopper (44) is actuated next time.

7. The resistance tester with a buffer clamping mechanism for ship resistance towing test according to claim 4, characterized in that: The force sensor (46) comprises a sensor body (461), an upper connecting seat (462) and a lower connecting seat (463); the sensor body (461) is a uniaxial tension and compression sensor. During the uniform speed driving stage of the test trailer, after the stopper (44) is retracted, the drag force of the test trailer and the sailing resistance of the ship model can act on the two ends of the sensor body (461) respectively. At this time, the force value of the sensor body (461) collected by the collector is the sailing resistance of the ship model.

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