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Free vibration experiment device

An experimental device and free technology, applied in educational appliances, instruments, teaching models, etc., can solve the problems of lack of experimental equipment for free vibration teaching and research, lack of perceptual knowledge, poor grasp of free vibration knowledge, etc., to facilitate popularization and popularization. The effect of simple application, simple equipment and safe use

Active Publication Date: 2020-03-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When teaching free vibration, some basic concepts involved in free vibration, such as: degree of freedom, main vibration mode, mode superposition, translational and torsional vibration, bending and shear vibration, damping, damping ratio, etc., are lacking. Perceptual knowledge, so that students do not have a good grasp of the knowledge of free vibration
One of the reasons for this disadvantage is that there is a lack of experimental equipment for free vibration teaching and research on the market

Method used

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  • Free vibration experiment device
  • Free vibration experiment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Such as Figure 8 , 9 , 10, and 14, the above-mentioned experimental device is used to simulate the bending-shaped translational vibration mode.

[0064] The vibrating rod 2 is one that is fixedly installed under the upper beam 12 through the clamp 11 .

[0065] The mass blocks are two mass balls 4 arranged up and down along the extending direction of the vibrating rod 2 , detachably connected to the vibrating rod 2 , and movable and fixedly connected to the vibrating rod 2 . Each mass sphere 4 is composed of two hemispheres 41 , the two hemispheres 41 are connected by screws 7 , and the opposite surfaces of the two hemispheres 41 form a clamping surface extending vertically downward for clamping the vibrating rod 2 . A vertical groove 8 is provided at the center of the opposing surfaces of the two hemispheres 41 . The cross section of the vertical groove 8 is an isosceles right triangle, which is convenient for clamping the circular vibrating rod 2 . Adjusting the t...

Embodiment 2

[0069] Such as Figure 11 , 12 , 13, and 14, the shear-shaped horizontal vibration mode was simulated using the above-mentioned experimental setup.

[0070] The vibrating rods 2 are two fixedly installed under the upper beam 12 through the clamp 11, and the two vibrating rods 2 are arranged in parallel.

[0071] The mass blocks are two mass plates 5 arranged up and down along the extending direction of the vibrating rod 2 , and each mass plate 5 includes a middle plate 51 and two splints 52 detachably and fixedly connected to both ends of the middle plate 51 . The middle plate 51 is connected with the clamping plate 52 by screws 7 , and a clamping surface extending vertically downwards for clamping the vibrating rod 2 is formed between the clamping plate 52 and the middle plate 51 . A vertical groove 8 is provided at the center of the opposite surface of the middle plate 51 and the splint 52 . The cross section of the vertical groove 8 is an isosceles right triangle, which i...

Embodiment 3

[0075] Such as Figure 15 , 16 , 17, and 18, the torsional vibration mode was simulated using the above experimental setup.

[0076] The vibrating rod 2 is one that is fixedly installed under the upper beam 12 through the clamp 11 .

[0077] The mass blocks are two mass rods 6 arranged up and down along the extending direction of the vibrating rod 2 , and each mass rod 6 includes a middle rod 61 and solid balls 62 fixedly connected to both ends of the middle rod 61 . Both ends of the middle rod 61 are respectively formed with threaded rods 611, and the solid ball 62 is provided with a threaded hole 621 matched with the threaded rod 611. The cooperation between the threaded rod 611 and the threaded hole 621 realizes the fixed connection between the middle rod 61 and the solid ball 62. . A U-shaped groove 612 is formed in the middle of the middle rod 61 , and an insert 613 that matches the U-shaped groove 612 and is detachably and fixedly connected is arranged in the U-shaped...

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Abstract

The invention discloses a free vibration experiment device, and relates to the technical field of vibration experiment equipment. The experimental device comprises a bracket, a vibrating rod, a mass block and an electromagnetic positioning and releasing device; at least one vibration rod is detachably connected with the support, at least one mass block is detachably connected with the vibration rod, and at least one set of electromagnetic positioning and releasing device is matched with the mass block. According to the free vibration experiment device disclosed by the invention, various different structural dynamics free vibration teaching demonstration experiments can be completed by adjusting the number or shapes of the vibration rods and the mass blocks, so that the perceptual knowledgeof students on free vibration is increased; meanwhile, the electromagnetic positioning and releasing device is arranged, the characteristic that attraction force is generated after the electromagnetis powered on and disappears at the same time after the electromagnet is powered off is utilized, the initial displacement of each mass block deviating from the balance position is accurately set, itis guaranteed that each mass block is released at the self-deviating position at the same time, and the accuracy of experiment results is improved.

Description

technical field [0001] The invention relates to the technical field of vibration experiment equipment, in particular to a structural dynamics free vibration experiment device. Background technique [0002] The current teaching method of structural dynamics in universities is mainly based on classroom theory explanation, and there is a lack of relevant teaching experiments. When teaching free vibration, some basic concepts involved in free vibration, such as: degree of freedom, main vibration mode, mode superposition, translational and torsional vibration, bending and shear vibration, damping, damping ratio, etc., are lacking. Perceptual knowledge, so that students do not have a good grasp of the knowledge of free vibration. One of the reasons for this disadvantage is that there is a lack of experimental equipment for free vibration teaching and research on the market. [0003] Therefore, in view of the above problems, it is necessary to propose a free vibration experimenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B23/10
CPCG09B23/10
Inventor 范力杨淇茹李升旗张政赵庆阳
Owner CHINA UNIV OF MINING & TECH
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