CN111458288A - Material damping characteristic testing device - Google Patents

Abstract

The invention relates to a material damping characteristic testing device, comprising a horizontal support plate, a horizontal oblong hole is opened in the middle of the horizontal oblong hole, a plurality of support blocks are fitted in the horizontal oblong hole, and the front side of the upper surface of the horizontal support plate A scale line is provided, a vertical support plate is installed on one end of the upper surface of the horizontal support plate, a vertical oblong hole is opened in the middle of the vertical support plate, and a bump is arranged on the upper side of the vertical support plate, and the outside of the bump is provided. The surface is locked with a plurality of spacers by bolts, and a cross beam is also fixed on the vertical support plate above the protruding block, and the cross beam is parallel to the horizontal support plate; the two ends of the lower surface of the horizontal support plate are respectively provided with support seats . The present invention has compact and reasonable structure, convenient operation, and can be flexibly adapted to different test methods through the cooperation of horizontal support plates, support blocks, vertical support plates, gaskets, beams and other components, and has good working reliability, convenient testing and High precision.

Description

Material damping characteristic testing device

technical field

The invention relates to the technical field of testing devices, in particular to a testing device for damping properties of materials.

Background technique

Damping is one of the important properties of materials, which can hinder the mechanical vibration of the system and convert the kinetic energy of vibration into heat or other forms of energy, thereby achieving the purpose of vibration reduction and noise reduction. Damping technology has been used in aviation, aerospace, ships, weapons, vehicles, construction and other fields.

The commonly used test methods for material damping are vibrating beam method, torsion pendulum method and compound oscillator method. The vibrating beam method is widely used at present, and NASA generally adopts this method to measure the performance of damping materials, and two standards for adopting this method have also been formulated in China. The vibrating beam method can be divided into single cantilever method, double cantilever method, three-point bending method, longitudinal wave method and torsion method, etc. The test frequency can reach 40kHz. The national standard GBT 18258-2000 and GBT16406-1996 respectively formulate the cantilever beam method and the cantilever method (free beam method), and use the bending resonance curve (frequency-amplitude) to test the damping coefficient.

The testing device in the prior art has a simple structure and a single function, and each testing method needs to use its own dedicated testing device, which has poor versatility.

SUMMARY OF THE INVENTION

Aiming at the shortcomings of the above-mentioned existing production technology, the applicant provides a material damping characteristic testing device with a reasonable structure, so that it has good versatility and can meet the national standards GBT 18258-2000 and GBT 16406-1996 on material damping performance testing On the one hand, it can be used to measure the damping performance of materials by the cantilever beam method, and on the other hand, it can be used to measure the damping performance of materials by the suspended wire method (free beam method). The method provides a replaceable support block, and the position of the support block can be adjusted, so that the test spline is in a state similar to a free beam, which makes up for the inconvenience of installation of the test spline by the traditional suspension method, and the spline is prone to overturn during the test process. Test accuracy.

The technical scheme adopted in the present invention is as follows:

A material damping characteristic testing device, comprising a horizontal support plate, a horizontal oblong hole is opened in the middle of the horizontal support plate, a plurality of support blocks are fitted in the horizontal oblong hole, and a scale is arranged on the front side of the upper surface of the horizontal support plate A vertical support plate is installed on one end of the upper surface of the horizontal support plate, a vertical oblong hole is opened in the middle of the vertical support plate, and a convex block is provided on the upper side of the vertical support plate, and the outer surface of the convex block is provided with bolts. A plurality of spacers are locked, and a cross beam is fixed on the vertical support plate above the protruding block, and the cross beam is parallel to the horizontal support plate; the two ends of the lower surface of the horizontal support plate are respectively provided with support seats.

As a further improvement of the above technical solution:

A test specimen is suspended on the beam, and a magnetoelectric sensor is installed in the horizontal oblong hole of the horizontal support plate.

The test strip is fixed between the gasket and the bump, and is locked by two bolts, and the magnetoelectric sensor is installed in the vertical oblong hole.

Two support blocks are arranged at intervals, test specimens are installed on the two support blocks, and a magnetoelectric sensor is installed in the horizontal oblong hole of the horizontal support plate.

Both the vertical oblong hole and the horizontal oblong hole are stepped holes.

The structure of a single support block is: including a base, the base is a "convex" shape structure, the base is matched with a horizontal oblong hole, the top surface of the base is fixed with a connecting block by fasteners, and the connecting block is The top surface is fitted with a diamond-shaped block; the front end of the connecting block is fixed with a pointer, and the pointer corresponds to the scale line.

The shape of the upper surface of the connecting block matches the shape of the lower surface of the diamond-shaped block.

The diamond-shaped block is made of aluminum, wood or glue.

The bottom of the support seat is provided with a rubber pad.

The beneficial effects of the present invention are as follows:

The invention has compact and reasonable structure, convenient operation, and can be flexibly adapted to different testing methods through the cooperation of horizontal support plates, support blocks, vertical support plates, gaskets, beams and other components, and has good working reliability, convenient testing, and high reliability. High precision.

The invention simultaneously meets the requirements of two material damping performance testing methods in national standards GBT 18258-2000 and GBT 16406-1996. On the one hand, it can be used to measure the damping performance of materials by the cantilever beam method, and on the other hand, it can be used to measure the damping performance of materials by the cantilever method. . At the same time, the test spline can be placed on the support block, and the support block can be adjusted to the position of the spline node to make it similar to the free beam state, which can also meet the test requirements of the bending resonance method. Compared with the traditional suspension method, this device can avoid The installation and operation of the suspension wire are inconvenient, and the problem of easy overturning during the spline testing process improves the testing efficiency and testing accuracy.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

Figure 2 is an exploded view of the present invention.

FIG. 3 is a schematic structural diagram of a support block of the present invention.

FIG. 4 is an exploded view of the support block of the present invention.

FIG. 5 is a schematic structural diagram of the horizontal support plate of the present invention.

Among them: 1, beam; 2, gasket; 3, bolt; 4, vertical support plate; 5, horizontal support plate; 6, support block; 7, scale line; 8, support seat;

401, vertical oblong hole; 402, bump;

501. Horizontal oblong hole;

601, diamond block; 602, connecting block; 603, pointer; 604, base.

Detailed ways

The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 5 , the material damping characteristic testing device of this embodiment includes a horizontal support plate 5 , a horizontal oblong hole 501 is opened in the middle of the horizontal support plate 5 , and a plurality of support blocks 6 are installed in the horizontal oblong hole 501 . , the front side of the upper surface of the horizontal support plate 5 is provided with a scale line 7, one end of the upper surface of the horizontal support plate 5 is provided with a vertical support plate 4, the middle of the vertical support plate 4 is provided with a vertical oblong hole 401, the upper part of the vertical support plate 4 One side is provided with a bump 402, the outer surface of the bump 402 is locked with a plurality of spacers 2 by bolts 3, and a cross beam 1 is also fixed on the vertical support plate 4 above the bump 402, and the cross beam 1 is parallel to the horizontal support plate 5; Two ends of the lower surface of the horizontal support plate 5 are respectively provided with support seats 8 .

A test strip is suspended on the beam 1 , and a magnetoelectric sensor is installed in the horizontal oblong hole 501 of the horizontal support plate 5 .

The test strip is fixed between the gasket 2 and the bump 402 , and is locked by two bolts 3 , and the magnetoelectric sensor is installed in the vertical oblong hole 401 .

Two support blocks 6 are arranged at intervals, and test strips are installed on the two support blocks 6 , and a magnetoelectric sensor is installed in the horizontal oblong hole 501 of the horizontal support plate 5 .

Both the vertical oblong hole 401 and the horizontal oblong hole 501 are stepped holes.

The structure of a single support block 6 is: including a base 604, the base 604 has a "convex" shape, the base 604 is matched with the horizontal oblong hole 501, and the top surface of the base 604 is fixed with a connecting block 602 by fasteners. The top surface is fitted with a diamond block 601 ; the front end of the connecting block 602 is fixed with a pointer 603 , and the pointer 603 corresponds to the scale line 7 .

The shape of the upper surface of the connecting block 602 matches the shape of the lower surface of the diamond-shaped block 601 .

The diamond block 601 is made of aluminum, wood or plastic.

The bottom of the support base 8 is provided with a rubber pad.

The concrete structure and function of the present invention are as follows:

Including beam 1, multiple spacers of different thicknesses 2, two sets of bolts 3, vertical support plate with oblong hole 4, horizontal support plate with oblong hole and scale 5, two replaceable support blocks 6, horizontal Scale line 7 on the support plate, support seat 8 with rubber pad;

When using the suspended wire method to measure the damping performance of the material, the beam 1 can be used to suspend the thin wire. At this time, the support block 6 is removed, and the horizontal oblong hole 501 in the middle of the horizontal support plate 5 can be used to install the non-contact magnetoelectric acceleration sensor.

When using the cantilever beam method to measure the damping performance of the material, the test strip is placed between the gasket 2 and the bump 402 and connected to the vertical support plate 4 by the bolt 3 .

The gasket 2 has different specifications, and the gasket 2 with an appropriate thickness can be selected according to the thickness of the test specimen. There is a groove in the middle of the vertical support plate 4, and a non-contact magnetoelectric acceleration sensor can be installed. In addition, the material damping performance test can be performed through the horizontal support plate 5 with oblong holes and scales, and two replaceable support blocks 6. The support block 6 can slide in the horizontal oblong hole 501 of the horizontal support plate 5. According to the test The position of the first-order node of the sample strip is the distance from the two ends of the spline, and the support block 6 is moved to the position of the node, so that it is in a free beam state, and the damping performance test can be carried out according to the bending resonance method. In addition, the scale line 7 on the horizontal support plate 5 can help the support block 6 to quickly move to the designated position. The diamond-shaped block 601 on the top of the support block 6 is available in three types: aluminum, wood and plastic, which can be tested according to the frequency of the test specimen. Adjust the sound curve to meet the test installation frequency requirements. The support base 8 is provided with a rubber pad, which can not only play a stabilizing role during testing, but also reduce the interference of other external vibration sources during the testing process.

The whole structure can be roughly divided into three parts:

1. Beam 1;

2. Gasket 2, two sets of bolts 3, vertical support plate 4;

3. Horizontal support plate 5, support block 6, scale line 7, support seat 8.

In the actual use process, according to the material damping performance test method used, different implementations are selected, as follows:

First, the hanging line method:

When using the suspension wire method to test the damping performance of the material, the beam 1 is used to test the suspension of the spline, and the concave horizontal oblong hole 501 of the horizontal support plate 5 is used to install the magnetoelectric sensor. At the same time, in order to ensure that the sensor use requirements are met between the suspended test strip and the magnetoelectric sensor, the support block 6 is removed.

2. Cantilever beam method:

When using the cantilever beam method to test the damping performance of the material, the test specimen is clamped by two sets of bolts 3 , spacers 2 and the protrusions 402 of the vertical support plate 4 . According to the thickness of the test specimens, choose different thicknesses of gasket 2. The magnetoelectric sensor is installed in the vertical oblong hole 401 of the vertical support plate 4 and can be slid up and down according to the length of the test strip to adjust to a suitable position.

Three, the hanging line method improvement method:

According to the numerical calculation result of the test spline, determine the position of the two nodes of the first-order bending mode of the test spline, place the test spline on the support block 6, move the two support blocks 6 to the position of the node, the scale line 7 can help quickly complete the operation. The magnetoelectric sensor is installed in the horizontal oblong hole 501 of the horizontal support plate 5 . In addition, the diamond-shaped block 601 at the top of the support block 6 is available in three types: aluminum, wood and plastic, which are selected according to the results of the test spline frequency response function curve to ensure that the installation frequency is 1/10-1/5 of the first-order modal frequency. times.

Easy to test and flexible to use.

The above description is an explanation of the present invention, not a limitation of the present invention. For the limited scope of the present invention, refer to the claims, and any form of modification can be made within the protection scope of the present invention.

Claims (9)

1. A material damping characteristic testing device is characterized in that: the device comprises a horizontal supporting plate (5), wherein a horizontal long round hole (501) is formed in the middle of the horizontal supporting plate (5), a plurality of supporting blocks (6) are installed in the horizontal long round hole (501) in a matched mode, scale marks (7) are arranged on the front side of the upper surface of the horizontal supporting plate (5), a vertical supporting plate (4) is installed at one end of the upper surface of the horizontal supporting plate (5), a vertical long round hole (401) is formed in the middle of the vertical supporting plate (4), a convex block (402) is arranged on one side of the upper portion of the vertical supporting plate (4), a plurality of gaskets (2) are locked on the outer surface of the convex block (402) through bolts (3), a cross beam (1) is further fixed on the vertical supporting plate (4) above the convex block (402), and the cross beam (; and supporting seats (8) are respectively arranged at two ends of the lower surface of the horizontal supporting plate (5).

2. The material damping characteristic testing device of claim 1, wherein: a testing spline is hung on the beam (1), and a magnetoelectric sensor is installed in a horizontal long circular hole (501) of the horizontal supporting plate (5).

3. The material damping characteristic testing device of claim 1, wherein: the test sample band is fixed between the gasket (2) and the bump (402) and locked by two bolts (3), and the magnetoelectric sensor is installed in the vertical long round hole (401).

4. The material damping characteristic testing device of claim 1, wherein: two supporting blocks (6) are arranged at intervals, test sample strips are installed on the two supporting blocks (6), and a magnetoelectric sensor is installed in a horizontal long circular hole (501) of the horizontal supporting plate (5).

5. The material damping characteristic testing device of claim 1, wherein: the vertical long round hole (401) and the horizontal long round hole (501) are both stepped holes.

6. The material damping characteristic testing device of claim 1, wherein: the structure of a single supporting block (6) is as follows: the device comprises a base (604), wherein the base (604) is in a convex structure, the base (604) is matched with a horizontal long circular hole (501), a connecting block (602) is fixed on the top surface of the base (604) through a fastener, and a diamond block (601) is installed on the top surface of the connecting block (602) in a matched mode; the front end of the connecting block (602) is fixed with a pointer (603), and the pointer (603) corresponds to the scale marks (7).

7. The material damping characteristic testing device according to claim 6, wherein: the shape of the upper surface of the connecting block (602) is matched with the shape of the lower surface of the diamond-shaped block (601).

8. The material damping characteristic testing device according to claim 6, wherein: the diamond blocks (601) are made of aluminum, wood or glue.

9. The material damping characteristic testing device of claim 1, wherein: and a rubber pad is arranged at the bottom of the supporting seat (8).

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