CN217637909U

CN217637909U - Underwater vibration exciter fixing and load measuring device

Info

Publication number: CN217637909U
Application number: CN202221823975.0U
Authority: CN
Inventors: 曹雄涛; 鲁显
Original assignee: Shanghai Maritime University
Current assignee: Shanghai Maritime University
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-21
Anticipated expiration: 2032-07-14

Abstract

The utility model discloses a fixed and load measurement device of vibration exciter under water, including vibration exciter, triangle-shaped panel, pillar, nut, bolt, force sensor, cable bundle, quality piece, ejector pin and under water the plate shell structure. The end plate of the vibration exciter is fixed with the triangular panel through a bolt, the triangular panel is fixed with the supporting column through a nut, and the bottom end of the supporting column is provided with the force sensor. The middle part of the bottom end of the vibration exciter is provided with a vibration exciter gripper, and the vibration exciter gripper is sequentially connected with the ejector rod and the force sensor. The mass blocks are arranged in multiple groups, the multiple groups of mass blocks are welded on an underwater plate shell structure, and the bottom end of the force sensor is connected with the mass blocks through threads. The cable bundle is connected with the vibration exciter and the cable of the force sensor. The utility model discloses realize the firm installation of vibration exciter under water, accurate all power load of measuring the vibration exciter to the plate shell structure transmission under water through multiunit force sensor has satisfied the matching nature of underwater acoustic experiment test requirement and experimental model and theoretical model.

Description

Underwater vibration exciter fixing and load measuring device

Technical Field

The utility model relates to a boats and ships and ocean engineering field specifically are a fixed and load measurement device of vibration exciter under water.

Background

The vibration and acoustic radiation test of the underwater plate shell structure is important test work in the fields of ship and ocean engineering. The ship power device is arranged on the base, and the base is welded with the submarine body of the submarine, so that the submarine body is forced to vibrate and radiate sound. The propeller thrust shaft transfers the load to the hull through the bearing seat, generating vibration and noise. These complex underwater structural systems require experimental testing of the structural model for vibration and acoustic properties, and the excitation and measurement of dynamic loads is an important part. The underwater structure sound vibration experimental device mainly comprises a load exciting device, an underwater plate shell structure and various sensor elements. Vibration exciters are usually piezoelectric, electromagnetic and magnetostrictive load exciting devices, and all three types of vibration exciters can be used as vibration sources for engineering structure vibration and acoustic radiation tests. The larger the output load of the vibration exciter is, the larger the mass is, and the problem of installation and fixation is caused. The load exciting device generates dynamic acting force to force the underwater structure to vibrate and radiate sound, and the force sensor, the acceleration sensor and the hydrophone are used for measuring the dynamic load, vibration and radiation sound pressure of the underwater structure respectively. The signal acquisition instrument acquires various electric signals of the sensor to realize measurement of various physical quantities.

Underwater structural vibration and acoustic radiation testing is more complex and difficult than in-air structural acoustic vibration testing. The load excitation device in the underwater structure sound vibration experiment easily causes extra load due to installation and fixation. The underwater structure sound vibration experiment is carried out in a closed space, the firm connection of the vibration excitation device and an underwater structure is ensured, and the influence of all dynamic loads on the sound vibration behavior of the structure is considered. This is a challenging task.

The installation mode of the underwater structure acoustic vibration experiment load excitation device is limited. For example, the elastic beam is connected with the sealing plates at two ends of the underwater plate shell structure, the vibration exciter is fixed on the beam, and then the vibration exciter outputs dynamic load to the shell. The vibration exciter mounting mode has the defects that the action loads at two ends of a beam cannot be measured, the test scheme is not in accordance with an underwater structure vibration theoretical model, so that the test result and the theoretical result cannot be compared, and some defects exist.

According to the scheme of the part of underwater structure sound vibration test, a steel plate is welded in a shell, and then the vibration exciter is fixed on the steel plate, so that part of dynamic load generated when the vibration exciter works is transmitted to the underwater shell structure through the steel plate, and the other part of dynamic load is directly output to the shell through the ejector rod. This will result in the inability of the force sensor to measure the line load at the junction of the steel plate and the housing, and therefore the dynamic load measurement of this experimental scheme also has significant disadvantages.

The sound vibration test scheme of part of underwater structures also adopts the air sound emitted by the sound box to excite the shell structure to vibrate. Although the sound box is light in weight and easy to fix, the air sound pressure has too small acting load on the structure and cannot meet the sound vibration test requirement of the underwater structure. In addition, one end of the shell structure is closed by a part of test schemes, one end of the shell structure is open, the structural part is inserted into water, and the vibration exciter is hung on an external lifting hook through an elastic rope, so that the underwater plate shell structure cannot be completely immersed into water, and the requirements of underwater structure sound vibration tests are not met.

When the test is used for researching the sound vibration characteristics of the underwater plate-shell structure, all the loads of the vibration exciter on the structure must be completely determined because each load has an important influence on the sound vibration behavior of the structure. Once there are any missing unknown loads, the acoustic radiation characteristics of the structural system cannot be analyzed, and it is not possible to identify which loads the structural vibration and radiation sound pressure is due to. For example, a plurality of loads acting on the base of the interior of an underwater vehicle, normal to the panel of the base, can be tested for only one load or a portion of the load, and the effect of the mechanical equipment load on the panel on the acoustic radiation of the structure cannot be determined at all. This structural hydroacoustic test scheme is also ineffective due to the absence of payload data. If all the loads acting on the underwater plate shell structure can be measured, all the measured loads can be input into the theoretical model, the effectiveness of the theoretical model can be checked by using test data, and the purpose of testing is achieved.

In order to solve the technical problem, the scheme provides an underwater vibration exciter fixing and load measuring device which meets the requirements of underwater structure vibration and acoustic radiation tests and determines all loads acting on a plate shell structure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vibration exciter is fixed and load measurement device under water to solve the power load test incompleteness that above-mentioned background art underwater vibration exciter installation produced, the problem of the whole power loads that can't measure the vibration exciter and produce satisfies the uniformity requirement of structure sound vibration test model and theoretical model under water.

In order to achieve the above object, the utility model provides a following technical scheme: an underwater vibration exciter fixing and load measuring device comprises a vibration exciter, a triangular panel, a supporting column, a nut, a bolt, a force sensor, a cable bundle, a mass block, an ejector rod and an underwater plate shell structure. The vibration exciter comprises a vibration exciter main body, a vibration exciter end plate and a vibration exciter gripper, the vibration exciter end plate is fixed with the triangular panel through the bolt, corners of the triangular panel are fixed with the strut through the nuts, the force sensor is installed at the bottom end of the strut, and the mass block is connected below the force sensor; the middle of the bottom end of the vibration exciter is provided with a vibration exciter gripper, the bottom of the vibration exciter gripper is fixed with the head of the ejector rod, and the bottom end of the ejector rod is connected with the force sensor; the mass blocks are arranged in multiple groups, and the multiple groups of mass blocks are welded on the underwater plate shell structure; the bottom end of the force sensor is connected with the mass block through threads; the power amplifier drives the vibration exciter to vibrate; and the three-way load electric signals output by two sides of each force sensor are connected with an external signal acquisition instrument through cables, and all action loads transmitted to the underwater plate shell structure by the vibration exciter are measured.

In a preferred embodiment, the bottom end of the mass is welded to the underwater plate shell structure, and the upper end of the mass is externally threaded.

As a preferred embodiment, the number of masses corresponds to the number of force sensors.

As a preferred embodiment, the mass blocks are arranged in four groups, and the four groups of mass blocks are respectively arranged corresponding to the corners of the triangular panel at the upper end and the positions of the vibration exciter grippers.

In a preferred embodiment, the vibration exciter end plate is fixed with the triangular panel through the bolts, and the triangular panel is mounted on the upper parts of the three pillars through nuts.

In a preferred embodiment, the bottom end of the strut is in threaded connection with the force sensor, and the bottom end of the force sensor is in threaded connection with the mass.

In a preferred embodiment, the middle part of the bottom end of the vibration exciter is in threaded connection with the vibration exciter gripper.

As a preferred embodiment, the bottom end of the ejector rod is in threaded connection with the force sensor, and the head of the ejector rod is connected with the lower end of the vibration exciter gripper.

As a preferred embodiment, the cable bundle comprises a sensor cable and a vibration exciter cable, and the external signal acquisition instrument and the power amplifier are connected with one end of the cable bundle; the vibration exciter cable at the other end of the cable bundle is connected with the vibration exciter, and the sensor cable is connected with the force sensor.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model provides a pair of vibration exciter is fixed and load measurement device under water, this scheme realize that the vibration exciter is firmly installed under water, and any load has not been left out to the whole loads of plate shell structure transmission under water to the accurate vibration exciter of measuring, has realized test model and theoretical model's matching nature.

2. The utility model provides a pair of vibration exciter is fixed and load measurement device under water, the mounting means of the vibration exciter under water of this scheme design is simple, and convenient operation can be used to curved surface and slab structure excitation, is applicable to multiple type vibration exciter installation and load measurement, reaches the experimental requirement of board shell structure sound vibration under water.

Drawings

Fig. 1 is a schematic view of the overall structure of the underwater vibration exciter fixing and load measuring device of the present invention;

FIG. 2 is a schematic view of the triangular panel structure of the present invention;

fig. 3 is a schematic diagram of a specific distribution structure of the mass block of the present invention;

fig. 4 is a schematic structural diagram of the force sensor of the present invention;

fig. 5 is a schematic view of the concrete structure of the pillar of the present invention.

In the figure: 1. a vibration exciter; 2. a support post; 3. a force sensor; 4. a mass block; 5. a top rod; 6. an underwater plate-shell structure; 7. an end plate of the vibration exciter; 8. a cable harness; 9. a nut; 10. a vibration exciter gripper; 11. a triangular panel; 12. a force sensor cable; 13. a vibration exciter cable; 14. and (4) bolts.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following description will be made for further explanation of specific application examples of the present invention with reference to the accompanying drawings 1 to 5:

as shown in fig. 1, the underwater plate-shell structure 6 is made of steel plate, and is generally a cylindrical shell structure with a base or other curved shell structure. The two ends of the underwater plate shell structure 6 are required to have good water tightness, so that accidents caused by water entering the structure are prevented. A force sensor cable 12 and an exciter cable 13 are connected to the respective wires in the cable bundle 8. The cable bundle 8 is waterproof and needs to ensure the water tightness of the joint when passing through the joint of the structural end plates. The power amplifier drives the vibration exciter 1 to work through the vibration exciter cable 13 in the cable bundle 8, and outputs power load. And the external signal acquisition instrument acquires load signals of the force sensor cable 12 in the cable bundle 8, so that the measurement of all dynamic loads is realized.

As shown in fig. 1-2, the triangular panel 11 has 6 holes in the middle, 1 hole in each of the three corners, and the triangular panel 11 is formed by processing a steel plate. And the bolt 14 penetrates through a round hole in the triangular panel 11 and the vibration exciter end plate 7 to fix the vibration exciter 1 and the triangular panel 11.

As shown in fig. 3, each small steel mass 4 has a protruding external thread at the center of the upper end surface for connecting the mass 4 with the bottom end surface of the force sensor 3. The mass 4 is distributed as shown in figure 3.

As shown in fig. 4, each force sensor 3 is a three-way force sensor, and has internal threads on both the upper and lower end surfaces thereof, and measures three applied loads in a three-dimensional space. The signal acquisition instrument is externally connected with an output channel of the force sensor 3, so that the measurement of all load signals is realized.

As shown in fig. 5. The steel support 2 has external threads at both ends and is fixed with a triangular panel 11 by nuts 9.

An underwater vibration exciter fixing and load measuring device comprises a vibration exciter 1, a triangular panel 11, a strut 2, a nut 9, a bolt 14, a force sensor 3, a cable bundle 8, a mass block 4, a top rod 5 and an underwater plate shell structure 6; the outer end part of the cable bundle 8 is connected with a signal acquisition instrument, the inner end part of the cable is connected with a vibration exciter cable 13, and the other part of the cable at the inner end is connected with a force sensor cable 12; the exciter end plate 7 is fixed with the triangular panel 11 through a plurality of groups of bolts 14. Mounting holes are formed in the corners of the triangular panel 11, and the triangular panel 11 is fixed through nuts 9 after the top end of the strut 2 penetrates through the mounting holes; every the upper and lower both ends of mounting hole all set up nut 9, and two sets of nuts 9 are installed on the upper portion of pillar 2.

A vibration exciter gripper 10 is arranged in the middle of the bottom end of the vibration exciter 1, the head of a push rod 5 is fixed at the bottom of the vibration exciter gripper 10, and a threaded joint is arranged at the bottom end of the push rod 5 and is connected with an internal thread at the upper end of the force sensor 3; the number of the mass blocks 4 is the same as that of the force sensors 3, four groups of mass blocks 4 are arranged, the four groups of mass blocks 4 are respectively arranged corresponding to the corners of the triangular panel 7 and the positions of the vibration exciter grippers 10, and the bottom ends of the four groups of mass blocks 4 are welded on the underwater plate-shell structure 6; the bottom of each force sensor 3 is connected through an external thread on the upper end surface of the mass block 4, and the left side and the right side of each force sensor 3 output three paths of power load signals; and determining all acting loads transmitted from the vibration exciter 1 to the underwater plate-shell structure 6 by measuring output signals of the multiple groups of force sensors 3.

Before the underwater vibration exciter fixing and load measuring device in the embodiment is used for testing the load of the vibration exciter, the device needs to be assembled, and the method comprises the following specific steps:

step 1: firstly, fastening a vibration exciter end plate 7 and a triangular panel 11 by utilizing a plurality of groups of bolts 14 to penetrate through mounting holes, so as to realize the firm connection of the vibration exciter 1 and the triangular panel 11;

step 2: determining the mounting positions of the mass blocks 4 on the underwater slab shell structure 6, respectively arranging the positions of the four mass blocks 4 with external threads at the upper ends thereof corresponding to corner mounting holes of a triangular panel 11 and the positions of a vibration exciter gripper 10, and welding the lower end surface sidelines of the mass blocks 4 with the underwater slab shell structure 6 together, so that three mass blocks 4 are welded at three angular points, and one mass block 4 is welded at the corresponding position of the vibration exciter gripper 10;

and step 3: then the bottom of each force sensor 3 is connected with the mass block 4 through the external thread on the upper end surface of the mass block 4, so that the four force sensors 3 and the four mass blocks 4 are fixedly installed;

and 4, step 4: connecting an external thread at the bottom of the ejector rod 5 with an internal thread at the upper end of the force sensor 3 below the vibration exciter gripper 10;

and 5: connecting the other three force sensors 3 with external threads at the bottom ends of the three support columns 2 through threaded holes at the upper ends;

step 6: the triangular panel 11 is respectively sleeved on the upper parts of the three support columns 2 through three mounting holes at the corners of the triangular panel, and the triangular panel 11 is clamped and fixed by two groups of nuts 9;

and 7: and finally, connecting and fixing the head of the ejector rod 5 and the vibration exciter gripper 10.

In this embodiment: the exciter 1 is firmly connected with the triangular panel 11 at the top end through a plurality of groups of bolts 14. Three corner mounting holes of the triangular panel 11 are respectively connected with the mass blocks 4 welded on the underwater plate shell structure 6 through three pillars 2, three pairs of two groups of nuts 9 and three groups of force sensors 3. A vibration exciter gripper 10 in the center of the bottom of a vibration exciter 1 is connected with a mass block 4 welded on an underwater plate shell structure 6 through an ejector rod 5 and a force sensor 3, so that main power load generated by the vibration exciter 1 is output to the underwater plate shell structure 6 through the ejector rod 5. The loads of the three groups of vibration exciters are transmitted to the underwater plate-shell structure 6 through the triangular panel 11, the three support columns 2, the three force sensors 3 and the three mass blocks 4. The four groups of force sensors 3 have twelve paths of load signals in total, and can determine all load components transmitted to the underwater plate shell structure by the vibration exciter 1. The underwater vibration exciter fixing and load measuring device can meet the load test requirements of sound vibration experiments of small and medium-sized underwater structures.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an underwater vibration exciter is fixed and load measuring device which characterized in that: the device comprises a vibration exciter, a triangular panel, a strut, a nut, a bolt, a force sensor, a cable bundle, a mass block, a push rod and an underwater plate shell structure; the vibration exciter comprises a vibration exciter main body, a vibration exciter end plate and a vibration exciter gripper, the vibration exciter end plate is fixed with the triangular panel through the bolt, corners of the triangular panel are fixed with the strut through the nuts, the force sensor is installed at the bottom end of the strut, and the mass block is connected below the force sensor; the middle of the bottom end of the vibration exciter is provided with a vibration exciter gripper, the bottom of the vibration exciter gripper is fixed with the head of the ejector rod, and the bottom end of the ejector rod is connected with the force sensor; the mass blocks are arranged in multiple groups, and the multiple groups of mass blocks are welded on the underwater plate shell structure; the bottom end of the force sensor is connected with the mass block through threads; the power amplifier drives the vibration exciter to vibrate; and the three-way load electric signals output by two sides of each force sensor are connected with an external signal acquisition instrument through cables, and all action loads transmitted to the underwater plate shell structure by the vibration exciter are measured.

2. An underwater vibration exciter fixing and load measuring device according to claim 1, wherein: the bottom end of the mass block is welded on the underwater plate shell structure, and the upper end of the mass block is provided with external threads.

3. An underwater vibration exciter fixing and load measuring device according to claim 1 or 2, wherein: the number of the mass blocks is consistent with that of the force sensors.

4. An underwater vibration exciter fixing and load measuring device according to claim 1 or 2, wherein: the mass blocks are arranged in four groups, and the four groups of mass blocks are respectively arranged corresponding to the corners of the triangular panel at the upper end and the positions of the vibration exciter grippers.

5. The underwater vibration exciter fixing and load measuring device according to claim 1, characterized in that: the vibration exciter end plate is fixed with the triangular panel through the bolt, and the triangular panel is installed on the upper portion of the support through the nut.

6. The underwater vibration exciter fixing and load measuring device according to claim 1, characterized in that: the bottom of pillar with force sensor threaded connection, the force sensor bottom with quality piece threaded connection.

7. The underwater vibration exciter fixing and load measuring device according to claim 1, characterized in that: the middle part of the bottom end of the vibration exciter is in threaded connection with the vibration exciter gripper.

8. The underwater vibration exciter fixing and load measuring device according to claim 1, characterized in that: the bottom end of the ejector rod is in threaded connection with the force sensor, and the head of the ejector rod is connected with the lower end of the vibration exciter gripper.

9. An underwater vibration exciter fixing and load measuring device according to claim 1, wherein: the cable bundle comprises a sensor cable and a vibration exciter cable, and the external signal acquisition instrument and the power amplifier are connected with one end of the cable bundle; the vibration exciter cable at the other end of the cable bundle is connected with the vibration exciter, and the sensor cable is connected with the force sensor.