CN211147976U - Device for frame modal test - Google Patents
Device for frame modal test Download PDFInfo
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- CN211147976U CN211147976U CN201922023077.1U CN201922023077U CN211147976U CN 211147976 U CN211147976 U CN 211147976U CN 201922023077 U CN201922023077 U CN 201922023077U CN 211147976 U CN211147976 U CN 211147976U
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Abstract
The utility model relates to the field of modal testing, in particular to a device for frame modal testing, which comprises a plurality of frame test plates, a plurality of frame test columns and a bottom plate, wherein the plurality of frame test columns are adjustably fixed around the bottom plate; each frame test board is adjustably and fixedly connected with the plurality of frame test columns and is parallel to the bottom plate. The device adopts the convenient connected mode of dismantling to carry out the node consolidation, and simple structure can change experimental operating mode, modal parameter in a flexible way, guarantees that frame construction's natural frequency is in the effective collection interval of sensor.
Description
Technical Field
The utility model relates to a mode test field specifically is a device for frame mode test.
Background
Modal analysis is a modern method for researching the dynamic characteristics of a structure, and is the application of a system identification method in the field of engineering vibration. Generally speaking, modal analysis is a natural vibration characteristic of a structure, and each order mode of the structure has its specific modal parameters, including modal frequency, modal damping, and modal shape. For indoor testing, the methods of obtaining these modal parameters generally fall into two categories: the first type is obtained by a finite element calculation method, and the second type is obtained by obtaining input and output data by using a sensor and a data acquisition device and then identifying a method based on related parameters. The method can effectively obtain the modal parameters of the structure, and the difference is that the modal parameters obtained based on experimental data are more reliable and closer to the real situation of the structure than the modal parameters obtained through finite element calculation; however, for the means of identifying the modal parameters by using the input and output data obtained by the modal test, a corresponding test platform is often required to implement the means.
The devices involved in the general frame mode test often do not have multifunctional characteristics, for example, most frame mode test platform nodes adopt a welding mode or other connection modes which cannot be detached quickly. In addition, because the relevant modal parameters of the structure are often changed according to the test requirements in the actual frame modal test, if the natural frequency of the test device is not in the effective acquisition interval of the sensor, the result of the modal test has large deviation, and the experiment platform may need to be set up again.
That is to say, traditional frame modal test device adopts the mode simulation solid support restraint of welding usually, and the experimenter can not conveniently change the experimental operating mode of modal test effectively according to the experiment demand. On the other hand, most of frame modal tests adopt steel (aluminum) pipes and steel (aluminum) plates to simulate column units of a frame structure, the materials often have higher rigidity, the structural fundamental frequency obtained in the modal test is often higher, a general sensor cannot effectively collect the structural fundamental frequency, and therefore the collected structural vibration signals cannot truly represent the vibration behavior of the structure.
Disclosure of Invention
In order to solve the problem that prior art exists, the utility model provides a device for frame modal test adopts the convenient connected mode of dismantling to carry out the node consolidation, and simple structure can change experimental operating mode, modal parameter in a flexible way, guarantees that frame construction's natural frequency is in the effective collection interval of sensor.
The utility model discloses a following technical scheme realizes: the device for the frame modal test comprises a plurality of frame test plates, a plurality of frame test columns and a bottom plate, wherein the plurality of frame test columns are adjustably fixed on the periphery of the bottom plate; each frame test board is adjustably and fixedly connected with the plurality of frame test columns and is parallel to the bottom plate.
In the preferred technical scheme, each frame test plate is connected with each frame test column through a right-angle steel sheet, and each frame test column is connected with the bottom plate through a right-angle steel sheet.
In the preferred technical scheme, the right-angle steel sheet includes the steel sheet body and the flank that extends out from the steel sheet body, and the flank is perpendicular to the steel sheet body, all is equipped with the screw on steel sheet body and the flank.
In a preferred technical scheme, a gasket is further arranged at the joint between each frame test plate and each frame test column, and the gasket and the right-angle steel sheet are respectively positioned on the top end face and the bottom end face of the frame test plate.
In the preferred technical scheme, a gasket is further arranged at the joint between the bottom plate and each frame test column, and the gasket and the right-angle steel sheet are respectively positioned on the top end surface and the bottom end surface of the bottom plate.
According to the technical scheme provided by the utility model, the utility model relates to a frame modal test platform, essential element are frame test device. The structure is simple, the disassembly and the assembly are convenient, the appearance applicability is good, and the working condition of the modal test can be flexibly changed. Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:
1. the utility model discloses a device for frame modal test, the principle is simple, and it is convenient to make, adopts convenient connected mode of dismantling the equipment such as bolt, tenon fourth of the twelve earthly branches, buckle to carry out the node consolidation, and the appearance suitability is good, and it tests the operating mode and can change in a flexible way.
2. According to the experimental requirements, the mass and rigidity of the frame test board can be changed by changing the parameters such as the type, density and section size (length, width and thickness) of the material of the frame test board, so as to change the modal frequency of the structure; the mass and rigidity of the frame test column can be changed by changing parameters such as the type, density and section size (length, width and thickness) of the material of the frame test column, so as to change the modal frequency of the structure; the interval between the frame test columns can be changed to change the rigidity of the frame test platform, so that the modal frequency of the structure is changed, on one hand, the purpose of changing the working condition of the frame modal test is achieved, on the other hand, the frame test platform can have a proper natural frequency to carry out modal test, and the test platform can be further ensured to be in the effective acquisition interval of the sensor.
3. According to the experimental requirement, the constraint mode of the frame structure can be changed to change the modal parameters of the structure according to the experimental requirement, the mass of the structure is greatly changed by increasing and decreasing the additional mass blocks on the frame test plate, and the boundary condition of the frame platform is changed by changing the constraint mode of the nut, so that the experimental working condition and the modal parameters are flexibly changed.
Drawings
FIG. 1 is a schematic view of the overall structure of the device of the present invention;
FIG. 2 is a schematic view of the joint consolidation of the frame test plate and the test column of the present invention;
FIG. 3 is a schematic view of a right angle steel plate of the present invention;
FIG. 4 is a schematic diagram of the present invention for adjusting the spacing between test columns;
fig. 5 is a schematic view of the present invention with the addition of mass blocks.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, in the present embodiment, the apparatus for frame mode test includes a plurality of frame test boards 2, a plurality of frame test columns 1 and a bottom plate 3, wherein the plurality of frame test columns are adjustably fixed around the bottom plate; each frame test board is adjustably and fixedly connected with a plurality of frame test columns and is parallel to the bottom plate; namely, the fixed positions of a plurality of frame test columns on the periphery of the bottom plate and each frame test plate can be adjusted. In the embodiment, the bottom plate is made of a steel plate with high mass density, so that the base and the upper structure cannot be subjected to translation in a horizontal plane in the test process.
The connection between the frame test plate and the frame test column is shown in fig. 2. This embodiment is illustrated by one of the frame test columns, the other frame test columns being identical. Each frame test plate is connected with each frame test column through two right-angle steel sheets 4, and each frame test column is connected with the bottom plate through two right-angle steel sheets 4. Each right-angle steel sheet comprises a steel sheet body 41 and a side wing 42 extending out of the steel sheet body, the side wing is perpendicular to the steel sheet body, and the steel sheet body and the side wing are provided with screw holes; each right-angle steel sheet is provided with 3 screw holes, and as shown in fig. 3, the right-angle steel sheets are fixed with the frame test plate and the frame test column through screws and nuts. In addition, a gasket 5 is arranged at the joint between each frame test plate and each frame test column, and the gasket and the two right-angle steel sheets are respectively positioned on the top end surface and the bottom end surface of the frame test plate. Similarly, a gasket 5 is arranged at the joint between the bottom plate and each frame test column, and the gasket and the two right-angle steel sheets are respectively positioned on the top end surface and the bottom end surface of the bottom plate.
In this embodiment, the plurality of frame test columns are fixed at four corners of the bottom plate, and the plurality of frame test columns are connected with four corners of each frame test board. Four angles of each frame test plate are provided with four screw holes, so that the steel sheet body of the right-angle steel sheet is connected with the frame test column through corresponding screw rods and nuts. The bottom plate and four angles of each frame test board all set up corresponding gasket, link to each other the frame test board through corresponding screw rod and nut to this guarantees the restraint quality of every layer of frame test board and frame test post node. Each frame test column is provided with a screw hole for fixedly connecting the side wings of the right-angle steel sheets.
The utility model discloses the device can change the material kind of frame test board and frame test post according to the experiment needs, changes its mass density, cross sectional dimension (length, width, thickness) etc to reach the demand of experiment, make the natural frequency of frame within the measuring range of sensor. Meanwhile, other screw holes are drilled in other parts of the test plate, so that the distance between the test plate and the test columns can be changed according to the experiment requirement, the adjustable fixed connection of the plurality of frame test columns, the bottom plate and the frame test plate can be realized, the rigidity of the frame test columns can be changed, and the purpose of the experiment can be achieved, as shown in fig. 4. In addition, according to the needs of the experiment, the mass block 6 can be added on the frame test board, and the mass of the frame is changed to achieve the effect of the experiment, which is shown in fig. 5.
The utility model discloses the device changes frame construction's natural frequency, and the following formula of involved principle is shown:
where ω is the natural frequency of the frame structure, and k, m represent the stiffness and mass of the frame test platform unit, respectively.
The device of the utility model is not only limited in the field of modal testing, but also can be used in the fields of corresponding vibration control, structural damage identification and the like; the method is not only limited to the frame test of the modal test, but also can be applied to the beam and rod test of the modal test, and only needs to remove the corresponding test plate in the frame structure. In addition, the device of the present invention may be variously shaped with respect to the gasket and the connecting member.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (8)
1. A device for a frame modal test is characterized by comprising a plurality of frame test plates, a plurality of frame test columns and a bottom plate, wherein the plurality of frame test columns are adjustably fixed on the periphery of the bottom plate; each frame test board is adjustably and fixedly connected with the plurality of frame test columns and is parallel to the bottom plate.
2. The apparatus for frame mode test according to claim 1, wherein each frame test plate is connected with each frame test column through a right-angle steel sheet, and each frame test column is connected with the bottom plate through a right-angle steel sheet.
3. The apparatus for frame modal testing of claim 2, wherein the right angle steel plate comprises a steel plate body and a side wing extending from the steel plate body, the side wing is perpendicular to the steel plate body, and the steel plate body and the side wing are provided with screw holes.
4. The apparatus according to claim 2, wherein a gasket is further provided at the junction between each frame test plate and each frame test column, and the gasket and the right-angle steel sheet are respectively provided at the top end face and the bottom end face of the frame test plate.
5. The apparatus of claim 2, wherein spacers are provided at the junction between the base plate and each frame test column, the spacers and the right angle steel plates being located at the top and bottom end surfaces of the base plate, respectively.
6. The apparatus for frame mode test according to claim 2, wherein each frame test plate is connected with each frame test column through two right-angle steel sheets, and each frame test column is connected with the bottom plate through two right-angle steel sheets.
7. The apparatus of claim 1, wherein a plurality of frame test columns are fixed at four corners of the base plate, and a plurality of frame test columns are connected with four corners of each frame test plate.
8. The apparatus of claim 1, wherein a mass is added to the frame test plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922023077.1U CN211147976U (en) | 2019-11-21 | 2019-11-21 | Device for frame modal test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922023077.1U CN211147976U (en) | 2019-11-21 | 2019-11-21 | Device for frame modal test |
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| CN211147976U true CN211147976U (en) | 2020-07-31 |
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| CN201922023077.1U Active CN211147976U (en) | 2019-11-21 | 2019-11-21 | Device for frame modal test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113192395A (en) * | 2021-05-07 | 2021-07-30 | 哈尔滨工业大学 | Can assemble multi-functional shearing type frame construction dynamics experiment model device |
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2019
- 2019-11-21 CN CN201922023077.1U patent/CN211147976U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113192395A (en) * | 2021-05-07 | 2021-07-30 | 哈尔滨工业大学 | Can assemble multi-functional shearing type frame construction dynamics experiment model device |
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