CN219936569U - A teaching device for structural dynamic characteristics - Google Patents

Abstract

The utility model discloses a structural dynamic characteristic teaching device which comprises a first device and a second device, wherein the first device comprises a bottom plate with a bolt hole at the bottom, a trapezoid body is arranged on the surface of the bottom plate, steel bars with different lengths are arranged on the trapezoid body, and the top of the steel bar is square; the device II comprises a U-shaped thick steel plate at the bottom and the top, the U-shaped thick steel plates are connected through thin steel plates at two sides to form a square frame structure, an overhanging damper bracket is arranged on the U-shaped thick steel plate, the overhanging damper bracket above and the overhanging damper bracket below are in axisymmetric structures, and an injector is arranged between the overhanging damper brackets. The device is small in size, and can be displayed in a classroom by a teacher, so that influences of rigidity, damping and mass on structural dynamic characteristics are truly seen and felt.

Description

A teaching device for structural dynamic characteristics

Technical field

The utility model relates to the technical field of architectural teaching devices, in particular to a structural dynamic characteristics teaching device.

Background technique

In the teaching process of civil engineering professional courses, the dynamic characteristics of structures is one of the indispensable chapters in teaching. However, due to its abstract concept, it is difficult to allow students to fully understand the three factors that affect dynamic characteristics during the teaching process of theoretical courses: stiffness, damping, and mass. The understanding of textbook text knowledge is relatively boring and difficult to truly understand. Learning through additional practical courses often takes a long time span, and the test device is larger in size and the test cost is higher, such as the device CN203562132U.

Utility model content

In order to overcome the problems existing in the above technology, the purpose of this utility model is to provide a structural dynamic characteristics teaching device, which has the characteristics of small size, light weight, easy portability, and simple installation and operation;

Due to the small size of the device, teachers can display it in the classroom, so that they can truly see and feel the effects of stiffness, damping, and mass on the dynamic characteristics of the structure.

In order to achieve the above purpose, the technical solution adopted by this utility model is:

A teaching device for structural dynamic characteristics, including device 1 and device 2. The device 1 includes a base plate 1 with bolt holes at the bottom. The base plate 1 has a trapezoidal body 2 on its surface. The trapezoidal body 2 is equipped with various lengths. Steel bar 3, the top of steel bar 3 is cube 4;

The second device includes U-shaped thick steel plates 6 at the bottom and top. The U-shaped thick steel plates 6 are connected by the thin steel plates 5 on both sides to form a square frame structure. The U-shaped thick steel plates 6 are provided with an overhanging damper bracket 8. The upper extending damper bracket 8 and the lower extending damper bracket 8 have an axially symmetrical structure, and a syringe 7 is arranged between the extending damper brackets 8 .

The first device is used to analyze the mass and stiffness among the three factors of structural dynamics, and the second device is used to analyze the damping among the three factors of structural dynamics.

The bottom plate 1 is provided with bolt holes 13, and the upper trapezoidal body 2 is provided with a groove 11. The size of the groove 11 is consistent with the size of the steel bar 3, so that the steel bar 3 can be inserted into the groove 11 and passed through. Tighten the bolts in the bolt holes 10 on the back of the trapezoidal body 2 to fix the steel bar 3. There is a support 12 on the top of the steel bar 3. The support 12 is used to fix the cubes 4 of different materials.

The U-shaped thick steel plate 6 and the thin steel plate 5 are connected and fixed into a rectangular body by four sets of bolts 9. There are bolt holes 14 on the U-shaped thick steel plate 6, and an overhanging damper bracket 8 is welded in the middle of the bolt hole 3 14, up and down. A syringe 7 is bonded in the two overhanging damper brackets 8 . The syringe 7 bonded between the two extending damper brackets 8 is used as a damper.

The steel bars 3 are divided into three sizes: long, medium and short. Among them, there are one long steel bar and one short steel bar each, and there are four medium steel bars, totaling six.

The four cubes are made of three materials: aluminum, copper and tungsten. Among them, there is one aluminum square and one tungsten cube, and three copper cubes, a total of six. The steel bar 3 and the trapezoidal body 2 can be disassembled at any time.

The bolt holes 13 on the bottom plate 1 of the device 1 are the same size as the bolt holes 14 of the U-shaped thick steel plate 6 of the device 2, and the distance between the bolt holes of the device 2 is twice the distance of the bolt holes 1. Conveniently, two devices can be set on a vibration table with bolt holes at the same time.

The complained devices one and two can not only be used for brief experimental demonstrations by manpower, but can also be connected to a professional vibration table through the bolt holes at the bottom for professional experimental demonstrations. Device one can be used to analyze the mass and stiffness of the three factors of structural dynamics, and device two can be used For analyzing the damping among the three factors of structural dynamics, the two devices can be used together to enable teachers to fully explain the structural dynamic characteristics.

Beneficial effects of this utility model:

1. Good portability

The utility model has a simple structure, few parts, small size, and light weight. The device can be split into different components, is easy to carry, and is simple to install and operate. It can be brought into the classroom by the teacher alone and carried out along with theoretical teaching, and the teaching effect will be better.

2. Low cost

The device has a simple structure, few parts, small size, light weight, and low processing cost; in addition, if any components are damaged, only the damaged components need to be replaced, saving maintenance costs. Device parts are relatively common. Take the syringe in Device 2 as an example. Compared with professional dampers, the syringe can not only meet the experimental results of the device.

3. Strong professionalism

This device can not only be used for classroom display, but can also be fixed on a professional shaking table by the bolts on the base plate for experimental display.

4. High degree of practice

During the experiment, teachers can arrange various creative teachings, such as asking students to guess the properties of materials in comparative experiments, or telling students the properties of materials to let students guess the conditions of the experiment, etc. Teachers can freely use the advantages of the device according to their own ideas. Used for teaching.

Description of the drawings

Figure 1 is device one of the present utility model.

Figure 2 is device two of the present utility model.

Figure 3 is a schematic diagram of a main part of the device of the present invention.

Figure 4 is a schematic diagram of the second main part of the device of the present invention.

Explanation of reference signs:

Bottom plate 1; trapezoidal body 2; steel bar 3; cube block 4; thin steel plate 5; U-shaped thick steel plate 6; syringe 7; extended damper bracket 8; bolt 9; bolt hole 10 on the back of the trapezoidal body; trapezoidal body concave Slot 11; support 12 at the top of the steel bar; bolt hole 2 13 on the bottom plate of the device; bolt hole 3 14 of the U-shaped steel plate.

Detailed ways

The utility model will be further described in detail below in conjunction with the examples.

Referring to Figures 1 to 4, the utility model is a structural dynamic characteristics teaching device, including:

There are two bolt holes 13 on the bottom plate 1, and a groove 11 is provided on the upper trapezoidal body 2. The size of the groove is consistent with the size of the steel bar 3, so that the steel bar can be inserted into the groove and passed through the trapezoidal body. Tighten the bolt hole 10 on the back to fix the steel bar. There is a support 12 on the top of the steel bar for fixing the cube blocks 4 of different materials.

The U-shaped thick steel plate 6 and the thin steel plate 5 are connected and fixed into a rectangular body by four sets of bolts 9. There are bolt holes 314 on the U-shaped thick steel plate, and an overhanging damper bracket 8 is welded in the middle of the bolt hole. The upper and lower overhanging dampers A syringe 7 is bonded in the syringe holder.

The steel bars 3 are divided into three sizes: long, medium and short. Among them, there are one long steel bar and one short steel bar each, and there are four medium steel bars.

The cube block 4 is made of three materials: aluminum, copper, and tungsten. There is one aluminum cube, one tungsten cube, and four copper cubes.

The steel bar 3 and the trapezoidal body 2 can be disassembled and rearranged at any time.

The syringe 9 bonded between the two extending damper brackets 8 is used as a damper.

The bolt hole two 13 on the base plate 1 is consistent with the bolt hole size 14 of the U-shaped thick steel plate 6 of the device two, and the distance between the bolt holes of the device two is twice the distance of the bolt holes one.

Devices 1 and 2 can not only perform brief experimental demonstrations manually, but can also be connected to a professional shaking table through the bolt holes at the bottom for professional experimental demonstrations.

The specific installation method of this utility model is:

Installation method of device 1: lay the two base plates 1 flat, insert the steel bars 3 into the trapezoidal body 2 on one base plate 1 in the order of long, medium and short, and at the same time, the copper cubes 4 are bonded to the steel bars 3 through supports. Three medium-length steel bars 3 are inserted into the trapezoidal body 2 on the other base plate 1. Cube blocks of aluminum, copper, and tungsten are respectively bonded to the three steel bars 3. After inserting the steel bar 3 into the trapezoidal body 2, tighten the bolts through the bolt holes on the back of the trapezoidal body 2 to fix the steel bar 3.

Installation method of device 2: Connect two U-shaped thick steel plates 6 and thin steel plates 5 into a rectangular body through a set of four bolts, install two sets of rectangular bodies, and attach two outgoing damper brackets 8 to one of the rectangular bodies. The syringe 7 is bonded and fixed with glue in the middle.

How to use this utility model:

After the installation of the device is completed, shake the two sets of devices at different frequencies, observe the shaking of the steel bar 3, and analyze the impact of stiffness and mass on the dynamic characteristics of the structure. Shake the two sets of devices at different frequencies, and observe the steel bar 3. The shaking of the bars. When the shaking frequency is low, the steel bars with greater stiffness, that is, the short steel bars, and the lighter steel bars, that is, the steel bars bonded to the aluminum cubes, shake violently. When the shaking frequency is high, the steel bars with smaller stiffness The steel bar, that is, the long steel bar and the heavier steel bar, that is, the steel bar bonded to the tungsten cube, shook violently. When it starts to shake, the effect displayed by the device is intuitive and clear, making it easy for students to observe and understand.

After the installation of device two is completed, use your feet to briefly fix the U-shaped thick steel plate 6 at the bottom of the device, and at the same time push the U-shaped thick steel plate 6 above the device. Observe the shaking of the two devices. When the pushing force is the same, The device with a syringe is more stable, and the effect displayed by the device is intuitive and clear, making it easier for students to observe and understand.

The syringe 7 can be used to replace professional dampers in this device, and the effect is intuitive. Commonly used items in life can be used in teaching devices to improve students' thinking ability.

The overhanging damper bracket 8 is used to fix the position of the syringe to prevent it from falling off during use.

Claims (7)

1. The teaching device for the structural dynamic characteristics is characterized by comprising a first device and a second device, wherein the first device comprises a bottom plate (1) with a bolt hole at the bottom, a trapezoid body (2) is arranged on the surface of the bottom plate (1), steel bars (3) with different lengths are arranged on the trapezoid body (2), and a cube (4) is arranged at the top of the steel bar (3);

the device II comprises a U-shaped thick steel plate (6) at the bottom and the top, the U-shaped thick steel plate (6) is connected through thin steel plates (5) at the two sides to form a square frame structure, an overhanging damper bracket (8) is arranged on the U-shaped thick steel plate (6), the overhanging damper bracket (8) at the upper part and the overhanging damper bracket (8) at the lower part are in axisymmetric structures, and an injector (7) is arranged between the overhanging damper brackets (8).

2. The teaching device for structural dynamics according to claim 1, wherein the first device is used for analyzing the mass and rigidity in the structural dynamics, and the second device is used for analyzing the damping in the structural dynamics.

3. The teaching device for structural dynamic characteristics according to claim 1, wherein the base plate (1) is provided with two bolt holes (13), the trapezoid body (2) above is provided with a groove (11), the size of the groove (11) is consistent with that of the steel bar (3), the steel bar (3) can be just inserted into the groove (11), the bolt is screwed through the first bolt hole (10) on the back of the trapezoid body (2) to fix the steel bar (3), the top of the steel bar (3) is provided with a support (12), and the support (12) is used for fixing square blocks of cubes (4) made of different materials.

4. The teaching device for structural dynamic characteristics according to claim 1, wherein the U-shaped thick steel plate (6) and the thin steel plate (5) are connected and fixed into a rectangular body through four groups of bolts (9), three bolt holes (14) are formed in the U-shaped thick steel plate (6), an overhanging damper bracket (8) is welded in the middle of the three bolt holes (14), one injector (7) is bonded in the upper overhanging damper bracket (8) and the lower overhanging damper bracket (8), and the injector (7) bonded between the two overhanging damper brackets (8) is used as a damper.

5. A constructional dynamic characteristic teaching device according to claim 1, characterized in that the bars (3) are divided into three dimensions, long, medium and short, wherein the long and short bars are each one, and the medium bars are each four, and six in total.

6. The teaching device for structural dynamic characteristics according to claim 1, wherein the square (4) is made of three materials of aluminum, copper and tungsten, wherein one square of aluminum and tungsten is provided, the other square of copper is provided, and the number of square of copper is six, and the steel bar (3) and the trapezoid (2) can be detached at any time.

7. The teaching device for structural power characteristics according to claim 1, wherein the second bolt hole (13) on the first base plate (1) of the device is identical to the third bolt hole (14) of the second U-shaped thick steel plate (6) of the device in size, and the distance between the second bolt holes of the device is twice the distance between the first bolt holes.