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Teaching experiment device for demonstrating performance of dynamic vibration absorber

A technology of dynamic vibration absorber and experimental device, applied in teaching models, instruments, educational appliances, etc., can solve the problem of not being able to display the influence of the quality, stiffness, and damping of dynamic vibration absorbers in many aspects, the damping being unadjustable, and the inability to compare passive vibration absorbers. , the characteristics of the hybrid vibration absorber, etc., to achieve the effect of simple structure, stable damping performance and easy installation

Pending Publication Date: 2018-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing dynamic vibration absorber teaching experiment device is usually a simple passive vibration absorber, and the quality and stiffness of the vibration absorber can only be adjusted at the same time, and the damping cannot be adjusted. For the teaching experiment, the dynamic vibration absorber cannot be displayed in many ways Affected by mass, stiffness, and damping, the characteristics of passive shock absorbers and hybrid shock absorbers cannot be compared

Method used

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  • Teaching experiment device for demonstrating performance of dynamic vibration absorber
  • Teaching experiment device for demonstrating performance of dynamic vibration absorber
  • Teaching experiment device for demonstrating performance of dynamic vibration absorber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as Figure 1 to Figure 11 As shown, a teaching experimental device for performance demonstration of dynamic vibration absorber, including:

[0046] Bottom plate 5;

[0047] Column 4 is fixed on the base plate 5;

[0048] A cantilever beam 3, one end is fixed on the top of the column 4, the other end is a free end and a number of threaded holes are uniformly arranged along the length direction;

[0049] The eccentric motor 2 is fixedly arranged on the top surface of the cantilever beam 3 in an adjustable position;

[0050] The contact vibrator 6 is fixed on the bottom plate 5 and is located directly below the cantilever beam 3;

[0051] Seven dynamic absorbers and three dynamic absorber fixing blocks, the seven dynamic absorbers are respectively: the first dynamic absorber 11, the second dynamic absorber 12, the third dynamic absorber 13, the fourth dynamic absorber 14, The fifth dynamic vibration absorber 15, the sixth dynamic vibration absorber 16, and the sev...

Embodiment 2

[0065] refer to Figure 12 , on the basis of Embodiment 1, the contact exciter 6 is used as the excitation source of the system, and the cylinder 65 is adjusted upwards, so that the ejector rod above it contacts the lower surface of the cantilever beam 3, and a certain predetermined Pressure, the eccentric motor 2 is still installed on the free end of the cantilever beam 3, but does not work, only as an additional mass. The excitation method of the contact vibrator 6 adopts a frequency sweep method, such as setting from 0 to fe, wherein the value of fe is greater than the first-order natural frequency of the cantilever beam and less than the second-order natural frequency, and the first acceleration sensor 31 is used to measure the cantilever beam 3 The acceleration response signal of the free end before and after the installation of the dynamic vibration absorber, and the force signal of the contact vibration exciter 6 as the input signal, draw the amplitude-frequency charact...

Embodiment 3

[0073] refer to Figure 13 , on the basis of Embodiment 2, a second dynamic vibration absorber 12 is added to form a double dynamic vibration absorber system. At this time, the amplitude-frequency characteristic curve of the acceleration response after the installation of the dynamic vibration absorber is observed, and it has three peaks, which are Making the three peaks equal makes it possible to satisfy Equation 2,

[0074] Formula 2: gamma 1 =0.403(μ+0.131) -0.437 , gamma 2 =-0.72μ+1.03

[0075] where γ 1 and gamma 2 respectively represent the ratio of the first dynamic vibration absorber 11 and the second dynamic vibration absorber 12 to the natural frequency of the main system, and the relevant parameters and calculation methods in the formula are the same as those described in Embodiment 2.

[0076]Further, the third dynamic vibration absorber 13 is added, and its simplified dynamic model is as Figure 19 As shown, the observed amplitude-frequency characteristic c...

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Abstract

The invention discloses a teaching experiment device for demonstrating the performance of a dynamic vibration absorber. The teaching experiment device comprises a bottom plate; a vertical column fixedto the bottom plate; a cantilever beam having one end fixed to the top of the vertical column and the other end used as a free end on which a plurality of threaded holes are uniformly distributed along the length direction; an eccentric motor fixedly disposed on the top surface of the cantilever beam in such a way that the position of the eccentric motor can be adjusted; a contact exciter fixed to the bottom plate and directly below the cantilever beam; and a plurality of dynamic vibration absorbers fixed to the bottom of the cantilever beam by dynamic vibration absorbers fixing blocks in such a way that the positions of the dynamic vibration absorbers can be adjusted and the number of the dynamic vibration absorbers can be selected. The teaching experiment device can adjust the mass, therigidity and the damping of the dynamic vibration absorbers, achieves the control of multiple dynamic vibration absorbers and multi-degree-of-freedom vibration, achieves passive and active hybrid dynamic vibration absorbers, and is simple in structure and easy to install.

Description

technical field [0001] The invention relates to the field of teaching equipment for vibration control demonstration, in particular to a teaching experiment device for dynamic vibration absorber performance demonstration. Background technique [0002] At present, the common methods of vibration control mainly include vibration elimination, vibration isolation and vibration absorption. Among them, the method of vibration absorption mainly uses dynamic vibration absorbers, which are widely used in industries such as automobiles, construction, and manufacturing equipment. In terms of teaching, in order to strengthen students' understanding of theoretical knowledge and enhance their practical ability, it is necessary to design a dynamic vibration absorber device that is convenient for demonstration operations in the laboratory. In theoretical research, the vibration control objects of dynamic vibration absorbers include single-degree-of-freedom and multi-degree-of-freedom, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B25/02
CPCG09B25/02
Inventor 上官文斌曾文豪李广龙
Owner SOUTH CHINA UNIV OF TECH
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