A modal shape demonstration device based on thin-walled plate vibration

Abstract

The utility model discloses a modal shape demonstration device based on thin wall board vibration is constituted by the excited vibration thin wall board, support connecting piece, loudspeaker, cross support, fine sand recovery device and base, and the base is hollow cube structure, is provided with cross support at the top of base, is provided with loudspeaker support above cross support, and the upper surface of loudspeaker support is fixed loudspeaker, the bottom of support connecting piece is fixed on the diaphragm of loudspeaker, and the top is fixed with magnet A, and the excited vibration thin wall board is placed on magnet A, and magnet B is arranged on the upper surface of excited vibration thin wall board, and magnet A and magnet B are attracted to each other and realize the fixation to excited vibration thin wall board, and fine sand recovery device is composed of funnel structure and drawer, and the bottom of funnel structure is set up above cross support, and loudspeaker support, loudspeaker, support connecting piece, excited vibration thin wall board are surrounded, and the lower part of base is provided with drawer, and the back of base is equipped with power amplifier module.

Description

Technical Field

[0001] This utility model patent relates to the field of modal vibration demonstration device design, specifically to a modal vibration mode demonstration device based on thin-walled plate vibration, which uses a loudspeaker to excite the thin-walled plate to observe and display its modal vibration mode. Background Technology

[0002] Thin-walled panel structures are widely used in engineering fields such as bridges, floors, ship decks, and offshore platforms. Due to their thin and light structural characteristics, they are prone to vibration under external excitation, and under certain special conditions, they can even cause resonance, which is very dangerous.

[0003] Vibration is highly detrimental to engineering structures, ranging from minor damage to the functionality of instruments and equipment mounted on thin-walled panels to outright destruction. Therefore, studying natural frequencies and mode shapes through modeling and experimentation has become an urgent issue.

[0004] Existing modal vibration demonstration devices are mostly large in size and have drawbacks such as high cost, long manufacturing time, lack of precise control over the excitation frequency, and a heavy workload for operators. Under these circumstances, it is particularly important to design a portable and easy-to-operate modal vibration demonstration device. Utility Model Content

[0005] There are many complex mechanical phenomena in the field of vibration. Among them, the modal vibration phenomenon of thin-walled plates is relatively obvious and easy to observe and obtain. The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a modal vibration mode demonstration device based on the vibration of thin-walled plates, and to popularize this mechanical phenomenon to the general public through this device.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A modal vibration demonstration device based on thin-walled plate vibration comprises an excited thin-walled plate, a supporting connector, a loudspeaker, a cross-shaped bracket, a fine sand recovery device, and a base. The base is a hollow cube structure, with a cross-shaped bracket on top. A loudspeaker support is positioned above the cross-shaped bracket, and a circular groove is provided on the upper surface of the loudspeaker support for engaging with the circular base of the loudspeaker to fix the loudspeaker. The bottom of the supporting connector is fixed to the diaphragm of the loudspeaker, and a magnet A is fixed to the top. The excited thin-walled plate is placed on the magnet A, and a magnet B is positioned on the upper surface of the excited thin-walled plate. Magnets A and B attract each other to fix the excited thin-walled plate.

[0008] The fine sand recovery device consists of a funnel-shaped structure and a drawer. The bottom of the funnel-shaped structure is located above a cross-shaped support and surrounds the speaker bracket, speaker, support connector, and vibrating thin-walled plate. A rectangular hole is provided on one side of the lower part of the base, and the drawer is located at the bottom of the base through the rectangular hole.

[0009] The base has an amplifier module on the back, which is connected to the speaker.

[0010] Furthermore, the support connector is a cylindrical structure, with its bottom vertically fixed to the speaker diaphragm by hot melt adhesive, and its top fixed to the magnet A by hot melt adhesive.

[0011] Furthermore, the cross-shaped bracket consists of two cylinders connected in a cross shape, and the speaker support is a hollow cuboid structure. The bottom of the four sides of the speaker support is provided with semi-circular recessed areas that match the shape of the cylinders, so as to achieve a stable connection between the speaker support and the cross-shaped bracket, and to achieve the purpose of support and fixation.

[0012] Furthermore, the bottom of the funnel-shaped structure is provided with four semi-circular grooves that fit the shape of the cylinder, and the funnel-shaped structure is stably fixed on the cross-shaped bracket through the semi-circular grooves.

[0013] Furthermore, the base and the cross-shaped bracket are integrally formed using 3D printing technology.

[0014] Furthermore, after the demonstration device is powered on, it wirelessly connects to a mobile device via the Bluetooth unit built into the power amplifier module, facilitating operation by the user. The mobile device includes a mobile phone and a remote control.

[0015] Furthermore, the power amplifier module is equipped with a knob, which can be adjusted to control the volume of the sound emitted by the speaker.

[0016] Furthermore, the excited thin-walled plate can vibrate under the action of a loudspeaker; fine sand is sprinkled on the surface of the excited thin-walled plate to observe the mode shape of the excited thin-walled plate.

[0017] Furthermore, the fine sand on the surface of the vibrating thin-walled plate continuously falls off during the vibration process; it is collected through a funnel-shaped structure and eventually slides into a drawer under the base for fine sand recycling.

[0018] Compared with the prior art, the beneficial effects of the technical solution of this utility model are:

[0019] (1) The thin-walled plate and system shell tested by this utility model are manufactured in sections using 3D printing technology, which makes it easy to manufacture various structures that are difficult to manufacture by normal processes, and ensures the smoothness of the structure surface, thereby reducing manufacturing costs and manufacturing time.

[0020] (2) In this utility model, the thin-walled plate under test is fixed by a strong magnet, so it can be replaced relatively easily, so as to conduct tests on thin-walled plates of various shapes and improve the testing capability of the system.

[0021] (3) In this utility model, a drawer is placed at the bottom of the outer shell. The fine sand collected in the funnel can enter the drawer below and be recycled, which avoids environmental pollution and waste of fine sand and reduces the workload of cleaning.

[0022] (4) The power amplifier module described in this utility model adopts a multi-interface power amplifier module, which can simultaneously use multiple exciters to conduct tests on multiple thin-walled plates, thereby increasing the application efficiency of the system.

[0023] (5) The power amplifier module described in this utility model can be quickly and wirelessly connected to a mobile control terminal (such as a mobile phone, computer, or remote control) via Bluetooth, which is convenient for operators to control and eliminates the trouble of wiring.

[0024] (6) In this utility model, the computer end uses the software to control the frequency of the exciter and can perform rapid frequency sweep for experiments, which reduces the amount of work for the operator and allows him to focus more on observation and recording. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the demonstration device of this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of the demonstration device of this utility model in the state where the vibrated thin-walled plate is not installed.

[0027] Figure 3 This is a side view of the demonstration device of this utility model.

[0028] Figure 4 This is a schematic diagram of the cross-shaped support structure.

[0029] Reference numerals: 1-base, 2-drawer, 3-cross-shaped bracket, 4-amplifier module, 5-speaker bracket, 6-funnel-shaped structure, 7-speaker, 8-support connector, 9-magnet A, 10-vibrated thin-walled plate, 11-magnet B. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0031] like Figures 1 to 4 As shown, this embodiment provides a modal vibration demonstration device based on thin-walled plate vibration, which consists of an excited thin-walled plate 10, a support connector 8, a loudspeaker 7, a cross-shaped bracket 3, a fine sand recovery device, and a base 1.

[0032] In this embodiment, the base 1 is a hollow cube structure, and a cross-shaped bracket 3 is provided on the top of the base 1. In this embodiment, the base 1 and the cross-shaped bracket 3 are integrally formed by 3D printing technology, and the 3D printing material can be polylactic acid. A speaker support 5 is provided above the cross-shaped bracket 3. A circular groove is provided on the upper surface of the speaker support 5, which is used to cooperate with the circular base of the speaker 7 to fix the speaker 7. The bottom of the support connector 8 is fixed on the diaphragm of the speaker 7, and a magnet A9 is fixed on the top. The vibrating thin-walled plate 10 is placed on the magnet A9, and a magnet B11 is provided on the upper surface of the vibrating thin-walled plate 10. The magnet A9 and the magnet B11 attract each other to fix the vibrating thin-walled plate 10.

[0033] The fine sand recovery device consists of a funnel-shaped structure 6 and a drawer 2. The bottom of the funnel-shaped structure 6 is located above the cross-shaped support 3 and surrounds the speaker support 5, speaker 7, support connector 8, and vibrating thin-walled plate 10. A rectangular hole is provided on one side of the lower part of the base 1, and the drawer 2 is located at the bottom of the base 1 through the rectangular hole.

[0034] The back of the base 1 is equipped with an amplifier module 4, which is connected to the speaker 7. The amplifier module 4 can be connected to a computer, and the computer can control the operation of the amplifier module 4 to adjust the vibration mode of the speaker 7.

[0035] Specifically, in this embodiment, the vibrating part of the demonstration device includes a speaker support 5, a funnel-shaped structure 6, a speaker 7, a support connector 8, magnet A9, magnet B11, and a vibrating thin-walled plate 10. The funnel-shaped structure 6 is also 3D printed, divided into four equal parts, each 3D printed separately. Each part has a semi-circular groove at the bottom center that engages with a cross-shaped bracket 3 intersecting the cylinder. The semi-circular groove engages with the lower cross-shaped bracket 3 to achieve support and fixation, thus securing the funnel-shaped structure 6. See [link to documentation]. Figure 4 The cross-shaped bracket 3 is formed by two cylindrical crosses connected together.

[0036] The speaker support 5 is a hollow cuboid structure. The bottom of the four sides of the speaker support 5 is provided with semi-circular recessed areas that match the cylindrical shape of the cross-shaped bracket 3, so as to fix the speaker support 5 and achieve the purpose of support and fixation.

[0037] The support connector 8 is a cylindrical structure. The bottom of the support connector 8 is vertically fixed to the diaphragm of the speaker with hot melt adhesive, and the top is fixed with a strong magnet A9 with hot melt adhesive.

[0038] Specifically, after the demonstration device is powered on, the excitation frequency of the speaker 7 is controlled by software programs on an external computer; or the demonstration device can be wirelessly connected to a mobile device via the Bluetooth unit built into the power amplifier module 4, facilitating operation by the user. Mobile devices include mobile phones, laptops, and remote controls. The power amplifier module 4 has a knob, which is adjusted to control the volume of the sound emitted by the speaker 7, i.e., the magnitude of the excitation force.

[0039] The vibrating thin-walled plate 10 can vibrate under the action of the loudspeaker 7; fine sand is sprinkled on the surface of the vibrating thin-walled plate to observe the mode shape of the vibrating thin-walled plate. The fine sand on the surface of the vibrating thin-walled plate 10 falls continuously during the vibration; it is collected through the funnel-shaped structure 6 and finally slides into the drawer 2 under the base 1 for fine sand recycling.

[0040] In the demonstration device of this embodiment, except for the speaker, support connector, power amplifier module, wires, and magnets, all other components are made by 3D printing technology.

[0041] The specific working process is as follows: Initially, power is supplied to the power amplifier module 4 and its connection to the computer is established. Then, the speaker 7 is properly connected to the vibrating thin-walled plate 10, and fine sand is sprinkled on it. After the computer program issues a command, the speaker 7 is controlled to vibrate at a specified frequency, or to perform frequency sweep vibration within a specified range and corresponding frequency duration. The magnitude of the excitation force emitted by the exciter is adjusted by adjusting the knob on the lower side of the power amplifier module 4. The mode shape patterns of each order presented on the vibrating thin-walled plate through the fine sand are observed and recorded. After the experiment, the scattered fine sand collected in drawer 2 is retrieved. The entire experiment is completed.

[0042] This utility model is not limited to the embodiments described above. The above description of specific embodiments is intended to illustrate and explain the technical solution of this utility model. The specific embodiments described above are merely illustrative and not restrictive. Without departing from the spirit and scope of protection of this utility model and the claims, those skilled in the art can make many specific modifications based on the teachings of this utility model, and these modifications all fall within the protection scope of this utility model.

Claims

1. A modal vibration mode demonstration device based on thin-walled plate vibration, characterized in that, It consists of a vibrating thin-walled plate, a supporting connector, a loudspeaker, a cross-shaped bracket, a fine sand recovery device, and a base. The base is a hollow cube structure. A cross-shaped bracket is provided on the top of the base. A loudspeaker support is provided above the cross-shaped bracket. A circular groove is provided on the upper surface of the loudspeaker support for cooperating with the circular base of the loudspeaker to fix the loudspeaker. The bottom of the supporting connector is fixed to the diaphragm of the loudspeaker, and a magnet A is fixed on the top. The vibrating thin-walled plate is placed on the magnet A, and a magnet B is provided on the upper surface of the vibrating thin-walled plate. The magnet A and the magnet B attract each other to fix the vibrating thin-walled plate. The fine sand recovery device consists of a funnel-shaped structure and a drawer. The bottom of the funnel-shaped structure is located above a cross-shaped support and surrounds the speaker bracket, speaker, support connector, and vibrating thin-walled plate. A rectangular hole is provided on one side of the lower part of the base, and the drawer is located at the bottom of the base through the rectangular hole. The base has an amplifier module on the back, which is connected to the speaker.

2. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1, characterized in that, The support connector is a cylindrical structure. The bottom of the support connector is vertically fixed to the diaphragm of the speaker with hot melt adhesive, and the top is fixed to the magnet A with hot melt adhesive.

3. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1, characterized in that, The cross-shaped bracket consists of two cylinders connected in a cross shape. The speaker support is a hollow cuboid structure. The bottom of the four sides of the speaker support has semi-circular recessed areas that match the shape of the cylinders, so as to achieve a stable connection between the speaker support and the cross-shaped bracket, and to achieve the purpose of support and fixation.

4. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 3, characterized in that, The bottom of the funnel-shaped structure has four semi-circular grooves that fit the shape of the cylinder, and the funnel-shaped structure is stably fixed on the cross-shaped bracket through the semi-circular grooves.

5. A modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1, 3, or 4, characterized in that, The base and cross-shaped bracket are integrally formed using 3D printing technology.

6. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1, characterized in that, After the demonstration device is powered on, it wirelessly connects to a mobile device via the Bluetooth unit built into the power amplifier module, making it convenient for operators to control. The mobile device includes a mobile phone and a remote control.

7. A modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1 or 6, characterized in that, The amplifier module is equipped with a knob, which is adjusted to control the volume of the sound emitted by the speaker.

8. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 1, characterized in that, The excited thin-walled plate can vibrate under the action of a loudspeaker; fine sand is sprinkled on the surface of the excited thin-walled plate to observe the mode shape of the excited thin-walled plate.

9. The modal vibration mode demonstration device based on thin-walled plate vibration according to claim 8, characterized in that, The fine sand on the surface of the vibrating thin-walled plate continuously falls off during the vibration process; it is collected through a funnel-shaped structure and eventually slides into a drawer under the base for fine sand recycling.

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