Underwater structure excitation device

Abstract

The invention relates to an underwater structure excitation device, and relates to the field of underwater structure dynamic characteristic excitation and test technology, the underwater structure excitation device comprises an excitation machine, an excitation rope is arranged between the excitation machine and a tested piece, a pre-tightening force adjusting assembly is arranged between the excitation machine and the excitation rope, the excitation rope and the tested piece are oppositely connected, and the pre-tightening force adjusting assembly is arranged between the excitation rope and the tested piece. And a sensor is arranged on the excitation rope. According to the invention, the excitation device is small in transverse rigidity and small in vibration interference; the excitation force and direction are adjustable, and the excitation system is convenient to install.

Description

Technical Field

[0001] The present application relates to the field of underwater structure dynamic characteristic excitation and testing technology, and in particular to an underwater structure excitation device. Background Art

[0002] At present, the excitation of underwater structure dynamic characteristics is usually carried out by using a vibration machine in combination with a vibration rod. As an important component for transmitting the exciting force, when the vibration rod is too long, its lateral stiffness will become smaller and it is easy to bend, thus affecting the effective transmission of the exciting force. In addition, the reduction of the lateral stiffness of the vibration rod is also easy to cause vibration interference, which has an adverse effect on the vibration response within the excitation frequency range.

[0003] The sensor for measuring the excitation force usually needs to be installed at the excitation point, which requires the sensor to be watertight and the direction of the excitation force must be consistent with the installation direction of the sensor. During the test, if the direction of the excitation force needs to be adjusted, the excitation rod and the excitation machine usually need to be reinstalled, which is not only difficult and labor-intensive, but also causes the test to be interrupted, affecting the continuity and efficiency of the test.

[0004] With regard to the above-mentioned related technologies, the inventor believes that the excited structure is in the water medium; the length of the excitation rod is limited, and the exciter needs to be designed to be watertight and fixed near the excited structure. The exciter and the excitation rod are in a reciprocating vibration state during operation, which is prone to watertight failure and water ingress failure, and the system reliability is low. Summary of the invention

[0005] In order to reduce the lateral stiffness of the excitation device and the vibration interference, the magnitude and direction of the excitation force can be adjusted, and the excitation system is easy to install, the present application provides an underwater structure excitation device.

[0006] The present application provides an underwater structure excitation device, which adopts the following technical solution:

[0007] An underwater structure excitation device includes an exciter, an excitation rope is arranged between the exciter and the measured object, a preload adjustment component is arranged between the exciter and the excitation rope, the excitation rope and the measured object are relatively connected, and a sensor is arranged on the excitation rope.

[0008] Optionally, the preload adjustment assembly includes a top connecting rod, the outer side of the top connecting rod is rotatably connected to a threaded sleeve, the top of the excitation rope is fixedly connected to a screw rod, the threaded sleeve is threadedly connected to the screw rod, and a spacing is left between the screw rod and the top connecting rod.

[0009] Optionally, a avoidance hole is coaxially opened at the center of the top connecting rod, the avoidance hole is opposite to the excitation rope, and the excitation rope can extend into the avoidance hole.

[0010] Optionally, the adjustment range of the threaded sleeve and the screw is 0-50mm.

[0011] Optionally, a universal joint is provided between the excitation rope and the measured object, the female end of the universal joint is fixedly connected to the excitation rope, and the male end of the universal joint is fixedly connected to the measured object.

[0012] Optionally, the excitation rope includes a top portion, the top of the sensor is fixedly connected to the top portion, a bottom end portion is provided at the bottom end of the sensor, the top of the bottom end portion is fixedly connected to the sensor, and the bottom end of the bottom end portion is connected to the measured object.

[0013] Optionally, the length of the top end portion is greater than the length of the bottom end portion, and the bottom end portion is located below the water surface.

[0014] Optionally, a lifting base is fixedly connected to the outer side of the vibration machine, and a lifting member is fixedly connected to the lifting base.

[0015] Optionally, the diameter of the excitation rope is between 0.8 mm and 1.1 mm.

[0016] Optionally, the preload force adjustment component drives the excitation rope to have a preload force ranging from 10N to 1000N.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. The excitation force is transmitted by a pre-tightened steel wire rope, which effectively reduces the lateral stiffness of the excitation device and reduces vibration interference. The excitation rope has a wide adjustment range, which is convenient for the arrangement of the exciter and the excitation rope. The excitation size is adjusted by adjusting the pre-tightening force of the excitation rope, and the direction of the excitation force is directly adjusted by rotating the excitation rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an underwater structure excitation device in an embodiment of the present application.

[0020] Explanation of the reference numerals: 1. Vibrator; 2. Measured object; 3. Excitation rope; 31. Top end; 32. Bottom end; 4. Universal joint; 5. Dynamic force sensor; 6. Preload adjustment assembly. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0023] At present, the excitation of underwater structure dynamic characteristics is usually carried out by using a vibration machine in combination with a vibration rod. As an important component for transmitting the exciting force, when the vibration rod is too long, its lateral stiffness will become smaller and it is easy to bend, thus affecting the effective transmission of the exciting force. In addition, the reduction of the lateral stiffness of the vibration rod is also easy to cause vibration interference, which has an adverse effect on the vibration response within the excitation frequency range.

[0024] The sensor for measuring the excitation force usually needs to be installed at the excitation point, which requires the sensor to be watertight and the direction of the excitation force must be consistent with the installation direction of the sensor. During the test, if the direction of the excitation force needs to be adjusted, the excitation rod and the excitation machine usually need to be reinstalled, which is not only difficult and labor-intensive, but also causes the test to be interrupted, affecting the continuity and efficiency of the test.

[0025] With regard to the above-mentioned related technologies, the inventor believes that the excited structure is in the water medium; the length of the excitation rod is limited, and the exciter needs to be designed to be watertight and fixed near the excited structure. The exciter and the excitation rod are in a reciprocating vibration state during operation, which is prone to watertight failure and water ingress failure, and the system reliability is low.

[0026] In order to reduce the lateral stiffness of the excitation device and the vibration interference, the magnitude and direction of the excitation force can be adjusted, and the excitation system is easy to install, the present application provides an underwater structure excitation device.

[0027] The following is combined with Figure 1 This application is described in further detail.

[0028] The present application embodiment discloses an underwater structure excitation device. Figure 1 An underwater structure excitation device includes an exciter 1 located above the water surface, a test piece 2 located on the bottom of the water below the water surface, and an excitation rope 3 is arranged between the exciter 1 and the test piece 2. In some embodiments, the excitation frequency range of the exciter 1 is not less than 5Hz-10kHz, and the excitation force range is not less than 10N-1000N.

[0029] A universal joint 4 is arranged between the bottom end of the excitation rope 3 and the test piece 2. The universal joint 4 includes a sub-end and a female end which are connected for relative rotation. The female end of the universal joint 4 is fixedly connected to the bottom end of the excitation rope 3, and the sub-end of the universal joint 4 is fixedly connected to the top side wall of the test piece 2. The universal joint 4 is arranged so that the connection position between the excitation rope 3 and the test piece 2 can be rotated.

[0030] The excitation rope 3 includes a top portion 31 close to the vibration machine 1 and a side close to the test piece 2. A dynamic force sensor 5 is arranged between the top portion 31 and the bottom portion 32. The top end of the dynamic force sensor 5 is fixedly connected to the bottom end of the top portion 31, and the bottom end of the dynamic force sensor 5 is fixedly connected to the top end of the bottom portion 32. The top end of the top portion 31 is relatively connected to the vibration machine 1, and the bottom end of the bottom portion 32 is relatively fixedly connected to the female end of the universal joint 4.

[0031] The length of the top end portion 31 is greater than that of the bottom end portion 32 , and one end of the top end portion 31 is located above the water surface, while the bottom end of the top end portion 31 is located below the water surface.

[0032] In some embodiments, the excitation rope 3 has a diameter of 0.8 mm-1.1 mm and a length of 2 m-3 m. It is made of a steel wire with high elasticity, high strength and light weight, and the preload range is between 10 N and 1000 N. The dynamic force sensor 5 has a dynamic force measurement frequency range of not less than 5 Hz-10 kHz and a dynamic force measurement range of not less than 10 N-1000 N.

[0033] A preload adjusting component 6 is provided between the exciter 1 and the top end 31 of the excitation rope 3 . The preload adjusting component 6 is used to adjust the preload of the excitation rope 3 so that the excitation rope 3 can maintain a straight state.

[0034] The preload force adjustment assembly 6 includes a top connecting rod, the top end of which is fixedly connected to the vibration machine 1, and a screw is coaxially arranged at the bottom end of the top connecting rod, the screw is coaxially arranged with the excitation rope 3, and the screw is fixedly connected to the excitation rope 3.

[0035] A threaded sleeve is provided between the top connecting rod and the screw rod, the threaded sleeve is provided outside the top connecting rod and the screw rod, and the top connecting rod is rotatably connected to the threaded sleeve, and the screw rod is threadedly connected to the threaded sleeve. A gap is left between the bottom ends of the screw rod and the top connecting rod, so that the relative screw rod and the top connecting rod can be driven to move in a relatively close or relatively away direction by rotating the threaded sleeve.

[0036] A relief hole is provided at the bottom wall of the top connecting rod relative to the screw rod, the relief hole is coaxially arranged with the top connecting rod, and by rotating the threaded sleeve, the screw rod at the bottom end can extend into the relief hole to adjust the preload force of the excitation rope 3. The adjustment range is between 0mm-50mm.

[0037] A lifting base is also fixedly connected to the outside of the vibration machine 1, and the lifting base is used for an external crane to lift the vibration machine 1. A lifting piece is fixedly connected to the lifting base. In some embodiments, the lifting piece is a hanging hook, and the hanging hook is fixedly connected to the lifting base. The crane drives the lifting base to move by lifting the hanging hook, thereby driving the vibration machine 1 to move.

[0038] When the test piece 2 is not immersed in water, the universal joint 4 is installed, and a section of the excitation rope 3 is fixed to the test piece 2 through the universal joint 4, and the other end of the excitation rope 3 is installed on the dynamic force sensor 5. The dynamic force sensor 5 is installed in series on the excitation rope 3 connected to the test piece 2, and then the dynamic force sensor 5 is connected to the exciter 1 through a section of the excitation rope 3. The excited underwater structure is immersed in water. The exciter 1 is fixed through the lifting base, and the exciter 1 and the lifting base are hoisted as a whole through the lifting equipment; the direction of the excitation force is directly adjusted by rotating the excitation rope 3 to determine the position of the exciter 1. The excitation rope 3 is connected to the exciter 1 through the preload adjustment component 6 of the excitation rope 3. The length of the excitation rope 3 is initially adjusted through the preload adjustment component 6, and the preload size is adjusted by screwing the thread. Adjust the exciter 1 system, dynamic force sensor 5 and measurement system, apply an excitation signal to the exciter 1, and excite.

[0039] In this application, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An underwater structure excitation device, characterized in that: The invention comprises a vibration exciter (1), an excitation rope (3) is arranged between the vibration exciter (1) and a test piece (2), a preload adjustment component (6) is arranged between the vibration exciter (1) and the excitation rope (3), the excitation rope (3) and the test piece (2) are relatively connected, and a sensor is arranged on the excitation rope (3).

2. The underwater structure excitation device according to claim 1, characterized in that: The preload force adjustment assembly (6) includes a top connecting rod, the outer side of the top connecting rod is rotatably connected to a threaded sleeve, the top end of the excitation rope (3) is fixedly connected to a screw rod, the threaded sleeve is threadedly connected to the screw rod, and a spacing is left between the screw rod and the top connecting rod.

3. The underwater structure excitation device according to claim 2, characterized in that: A avoidance hole is coaxially opened at the center of the top connecting rod, the avoidance hole is opposite to the screw rod, and the screw rod can extend into the inside of the avoidance hole.

4. The underwater structure excitation device according to claim 3, characterized in that: The adjustment range of the threaded sleeve and the screw is 0-50mm.

5. The underwater structure excitation device according to claim 1, characterized in that: A universal joint (4) is provided between the excitation rope (3) and the measured object (2); the female end of the universal joint (4) is fixedly connected to the excitation rope (3), and the male end of the universal joint (4) is fixedly connected to the measured object (2).

6. The underwater structure excitation device according to claim 1, characterized in that: The excitation rope (3) comprises a top end portion (31), the top end of the sensor is fixedly connected to the top end portion (31), a bottom end portion (32) is arranged at the bottom end of the sensor, the top end of the bottom end portion (32) is fixedly connected to the sensor, and the bottom end of the bottom end portion (32) is connected to the measured object (2).

7. The underwater structure excitation device according to claim 6, characterized in that: The length of the top end portion (31) is greater than the length of the bottom end portion (32), and the bottom end portion (32) is located below the water surface.

8. The underwater structure excitation device according to claim 1, characterized in that: The outer side of the vibration machine (1) is fixedly connected to a lifting base, and the lifting base is fixedly connected to a lifting member.

9. The underwater structure excitation device according to any one of claims 1 to 8, characterized in that: The diameter of the excitation rope (3) is between 0.8 mm and 1.1 mm.

10. The underwater structure excitation device according to any one of claims 1 to 8, characterized in that: The pre-tightening force of the excitation rope (3) driven by the pre-tightening force adjustment component (6) ranges from 10N to 1000N.

Images