CN116891159A - Cable pretension self-adaptive adjusting device - Google Patents

Abstract

The invention relates to a cable pretension adaptive adjustment test device, which includes a mooring cable stiffness simulation system, a pretightening force adjustment system, a mooring cable drag point, a lower computer and a wireless transmission system and a host computer. The cable stiffness simulation system is installed on the mooring cable. The drag point and the preload adjustment system are connected through a cable; the preload adjustment system is connected to the cable through a tension sensor for testing the cable tension, and is connected to the upper computer and lower computer through a wireless transmission system. The upper computer is connected to the preloader. The servo motor of the tension adjustment system is used to control the action of the servo motor and thereby control the tension of the cable. The present invention simulates the stiffness curve of the cable by using a series spring, drives the telescopic spring group of the servo motor to complete the adjustment and calibration of the mooring force, and uses the tension sensor to react in real time to the tension acting on the cable, so as to obtain the initial pre-tightening of the mooring cable. force; it can ensure that the mooring force is less affected by friction, making the test results more realistic.

Description

A cable pretension adaptive adjustment device

Technical field

The invention relates to a cable testing device in marine engineering testing, in particular to a testing device that automatically and accurately adjusts the initial pretension of the cable in ship and marine engineering testing.

Background technique

When ships and marine structures are docked at docks, cables are required. When ships are docked at floating docks, cables are also required. An elastic restraint system is formed between the cables and the ship and between the cables and the bitts. The form of the moorings in this system is Pretensioning forms the key to a mooring system. When ships and marine structures are moored in piers or floating docks, the mooring ship will move to a certain extent due to external wind, wave, current and other loads. The initial force of the mooring cable and the pretension of the cable will affect the behavior of the ship under different external forces. Movement, which in turn affects the change of mooring force under external force, thus affecting the mooring safety of ships or marine structures.

For the mooring safety issues of ships or marine structures, the commonly used research methods are numerical calculations and model tests. For such nonlinear problems, the results of model tests are more credible. For example, patent publication number CN210426852U discloses a ship A model test device for mooring cables. This device can simulate the elasticity of the cable in the physical model test of the mooring ship, and can also measure the cable tension and apply pre-tension. The test results can be used to analyze the mooring force of moored ships under the action of wind, waves, currents and other factors, providing necessary basis for wharf structural design, operation management and safety risk assessment. However, during model testing, the degree of simulation of the initial pretension determines the reliability of the test. When mooring ships or marine structures, multi-cable mooring is usually adopted. The usual cable pretension adjustment is performed manually on a single The adjustment of the cable will affect the pretension results of other cables, resulting in the phenomenon of repeated adjustment of a single cable multiple times, which greatly restricts the efficiency of the model test.

Contents of the invention

In order to solve the above technical problems, the present invention provides an adaptive adjustment device for cable pretension.

In order to achieve the above objects, the specific technical solutions of the present invention are as follows:

A cable pretension adaptive adjustment test device, including a mooring cable stiffness simulation system, a pretightening force adjustment system, a mooring cable drag point, a lower computer and a wireless transmission system and a host computer. The cable stiffness simulation system is installed on the mooring cable drag point and The pre-tightening force adjustment system is connected to each other through a cable; the pre-tightening force adjustment system is connected to the cable through a tension sensor for testing the cable tension, and is connected to the upper computer and lower computer through a wireless transmission system. The upper computer is connected to the pre-tightening force adjustment system. The servo motor of the system is used to control the action of the servo motor and thereby control the tension of the cable.

Further, the wireless transmission system is installed on the mother ship model, the mooring point is set on the sub-ship model, and the upper computer is set on the shore.

Further, the pre-tension adjustment system is composed of a tension sensor, a servo motor, and a motor coupling. The motor coupling is connected to one end of the spring group through a steel wire or nylon wire. The servo motor rotates at a certain angle after receiving the pulse amount sent by the lower computer. Controls the tightness of the spring pack and thus the tension on the entire cable.

Furthermore, the servo motor has a power-down self-locking function.

Furthermore, the preload adjustment system realizes the overall stiffness coefficient of the mooring cable required by the test through the series combination of multiple groups of different springs and setting corresponding limit distances.

Furthermore, the preload adjustment system stretches the spring group to change the preload force by dragging the cable with the servo motor.

Furthermore, the mooring cable stiffness simulation system is composed of a slide rail, a slide block, a spring group, and a limit plate. The spring group is installed on the slide block and can move freely along the slide rail; the springs in the spring group are connected in series, and the tension The sensor is installed on the original slide block, which is connected to the limit plate through fastening bolts and limit nuts.

Furthermore, the limiting plate cooperates with the tightening nut to limit the maximum stretching amount of the spring; by connecting springs with different stiffness coefficients in series, a nonlinear stiffness curve can be obtained to simulate the performance of various types of mooring cables.

Further, the lower computer receives the cable tension information tested by the tension sensor and transmits the signal to the shore upper computer through a wireless transmission system. The upper computer compares the target pretightening force and transmits the mooring cable tension amount through the wireless transmission system. It goes to the lower machine to control the action of the servo motor to achieve the pretension adjustment effect.

Further, the mooring point is composed of a universal ball head and a pulley. The universal ball head is installed on the ship or ocean platform model to be tested. The pulley group guides the direction, and the mooring point and the mooring cable are connected by a cable or nylon line. The stiffness simulation system is used to simulate the mooring force of the model being affected by waves, ship attitude, and collision in the mooring state.

The beneficial effects of the present invention are:

This invention simulates the stiffness curve of the cable by using series springs, drives the telescopic spring group of the servo motor to complete the adjustment and calibration of the mooring force, and uses the tension sensor to react in real time to the tensile force acting on the cable to obtain the initial pre-tightening of the mooring cable. force; it can ensure that the mooring force is less affected by friction, making the test results more realistic. This device is mainly used for mooring model tests in ship and ocean engineering tests.

Description of the drawings

Figure 1 is an outline structural diagram of an adaptive adjustment device for cable pretension according to an embodiment of the present invention;

Figure 2 is a structural diagram of the mooring cable stiffness simulation system and preload adjustment system according to the embodiment of the present invention;

Figure 3 is a schematic diagram of the pretension adjustment system according to the embodiment of the present invention;

In the picture: 1 is the ship model, 2 is the universal ball head, 3 is the cable, 4 is the pulley, 5 is the mooring stiffness simulation system, 6 is the tension sensor, 7 is the servo motor, 8 is the lower computer, and 9 is the upper computer. , 10 is the wireless transmission module, 11 is the slide rail, 12 is the dock or ship bulkhead, 13 is the limit plate, 14 is the tension sensor, 15 is the guide pulley, 16 is the spring, 17 is the servo motor, 18 is the slide rail, 19 is the slider, and 20 is the preload adjustment system.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

As shown in Figures 1, 2, and 3, a ship and ocean engineering cable pretension adaptive adjustment test device is suitable for a variety of ships. It consists of a mooring stiffness simulation system 5, a pretightening force adjustment system 20, a mooring towing point, It is composed of lower computer 8, wireless transmission system 10 and upper computer 9. Mooring cable stiffness simulation system 5, preload adjustment system, wireless transmission system 10 are installed on the mother ship model, the mooring cable towing point is set on the sub-ship model, and the host computer 9 is set on the shore. The cable stiffness simulation system 5 is installed between the mooring point and the preload adjustment system 20 and is connected through the cable 3 .

The mooring cable stiffness simulation system 5 consists of a slide rail 11, a slide block 19, a spring group, a limit plate 13, and a tightening nut. The spring group is installed on the slide block 19 and can move freely along the slide rail 11. The limiting plate 13 cooperates with the tightening nut to limit the maximum stretching amount of the spring 19. By connecting springs with different stiffness coefficients in series, a nonlinear stiffness curve can be obtained to simulate the performance of various types of mooring cables.

The pretension adjustment system 20 is composed of a tension sensor 6, a servo motor 7, a driver, and a coupling. The servo motor 7 has a power-off self-locking function. The coupling is connected to one end of the spring group through a steel wire or nylon wire. The servo motor 7 receives the pulses sent by the lower machine 8 and then rotates at a certain angle to control the tightness of the spring group, thereby controlling the tension on the entire mooring cable.

The mooring point is composed of a universal ball head 2 and a pulley 4. The universal ball head 2 is installed on the ship or ocean platform model to be tested. Through the pulley group to guide the direction, the cable 3 or nylon line connects the mooring point and the mooring stiffness simulation system 5 to simulate the mooring force of the model being affected by physical quantities such as waves, ship attitude, and collision in the mooring state.

The lower computer 8 is connected to the wireless transmission system 9 and the upper computer 10. Using the PID control algorithm, the upper computer 10 compares the difference between the tension sensor 14 and the target pretension. After calculation, it is sent to the lower computer 8 through the wireless transmission system 9. The lower computer 8 Convert the difference into an angle and control the rotation of servo motor 7 to adjust the pretension. The tension sensor 14 feeds back to the upper computer 10 through the lower computer 8 and the wireless transmission system 9, forming a closed control loop.

Example:

As shown in Figure 1, the towing point of the universal ball head 2 is installed on the hull 1. The cable 3 is made of steel wire or nylon and has high stiffness. A pulley 4 is installed on the dock or ship bulkhead 12 to guide the cable and connect various components. The mooring cable stiffness simulation system 5 installed on the dock or ship bulkhead 12 is internally connected by a plurality of springs 16 in series, and a limit plate 13 is used to limit the spring tension. When the mooring cable is subject to a change in tension, the mooring cable stiffness The spring set in simulation system 5 is stretched to simulate the nonlinear stiffness of the actual mooring cable. The tension sensor 6, servo motor 7, lower computer 8, wireless transmission module 10 and upper computer 9 form a closed-loop pretension adjustment system. The tension sensor 6 measures the tension value on the mooring cable and transmits it to the upper computer 9 through the lower computer 8 and the wireless transmission module 10 to form feedback. In the upper computer 9, the difference between the measured tension value and the target pretension value given by the mooring experiment is used as the optimization target of the PID algorithm and is transmitted to the lower computer 8 through the infinite transmission module 10, and is calculated and converted by the lower computer 8 After reaching the adjusted angle value, the servo motor 7 is controlled to rotate to realize automatic adjustment of the pretension. At the same time, the data collection function of the mooring cable model test is satisfied through real-time testing of the mooring cable tension.

As shown in Figure 2, the specific implementation of the mooring stiffness simulation system and the pre-tension adjustment system, the slide rail 18 is installed on the dock or ship bulkhead 12, the servo motor 17 and the guide pulley 15 are fixedly connected to the slide rail 18, and the slide block 19 can move along the The slide rail 18 slides freely, and the friction coefficient is extremely small. The spring 16 is installed on the slider 18 , a plurality of springs 16 are connected in series, and their stretching amount is limited by the limiting plate 13 . The tension sensor 14 is installed on the original slide block 18, and the slide block 18 is connected to the limit plate 13 through fastening bolts and limit nuts.

The specific embodiments of the present invention have been described in detail above, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a hawser pretension self-adaptation adjustment test device which characterized in that: the system comprises a mooring rope rigidity simulation system, a pretightening force adjusting system, a mooring rope towing point, a lower computer, a wireless transmission system and an upper computer, wherein the mooring rope rigidity simulation system is arranged between the mooring rope towing point and the pretightening force adjusting system and is connected through a mooring rope; the pre-tightening force adjusting system is connected with the cable through the tension sensor and used for testing the tension of the cable and is connected with the upper computer and the lower computer through the wireless transmission system, and the upper computer is connected with the servo motor of the pre-tightening force adjusting system and used for controlling the action of the servo motor so as to control the tension of the cable.

2. The cable pretension adaptive adjustment test device according to claim 1, characterized in that: the wireless transmission system is arranged on a mother ship model, the mooring rope towing point is arranged on a child ship model, and the upper computer is arranged on the shore.

3. The cable pretension adaptive adjustment test device according to claim 1, characterized in that: the pretension adjusting system is composed of a tension sensor, a servo motor and a motor coupler, wherein the motor coupler is connected with one end of the spring set through a steel wire or a nylon wire, and the servo motor rotates a certain angle after receiving pulse quantity sent by the lower computer to control tightness of the spring set, so that tension on the whole cable is controlled.

4. A cable pretension adaptive adjustment test device according to claim 3, characterized in that: the servo motor has a power-down self-locking function.

5. A cable pretension adaptive adjustment test device according to claim 3, characterized in that: the pretightening force adjusting system realizes the overall rigidity coefficient of the mooring rope required by the test by combining a plurality of groups of different springs in series and setting corresponding limiting distances.

6. A cable pretension adaptive adjustment test device according to claim 3, characterized in that: the pretightening force adjusting system stretches the spring group to change pretightening force in a mode that the servo motor drags the cable.

7. The cable pretension adaptive adjustment test device according to claim 1, characterized in that: the mooring rope stiffness simulation system consists of a sliding rail, a sliding block, a spring group and a limiting plate, wherein the spring group is arranged on the sliding block and can freely move along the sliding rail; the springs in the spring group are connected in series, the tension sensor is arranged on an initial sliding block, and the sliding block is connected with the limiting plate through a fastening bolt and a limiting nut.

8. The cable pretension adaptive adjustment test device of claim 7, wherein: the limiting plate is matched with the tightening nut to limit the maximum stretching amount of the spring; by connecting springs with different stiffness coefficients in series, a nonlinear stiffness curve can be obtained to simulate the performance of various mooring ropes.

9. The cable pretension adaptive adjustment test device according to claim 1, characterized in that: the lower computer receives cable tension information tested by the tension sensor, transmits signals to the upper computer on shore through the wireless transmission system, compares target pretightening force by the upper computer, and transmits the stretching amount of the mooring rope to the lower computer through the wireless transmission system so as to control the action of the servo motor, thereby realizing the adjustment effect of the pretightening force.

10. The cable pretension adaptive adjustment test device according to claim 1, characterized in that: the mooring rope towing point consists of a universal ball head and a pulley, the universal ball head is arranged on a ship or ocean platform model to be tested, and the mooring rope towing point and the mooring rope rigidity simulation system are connected through a mooring rope or a nylon wire in the guiding direction of the pulley block so as to simulate that the mooring rope force of the model is influenced by waves, the ship posture and collision in the mooring rope state.