Friction self-excitation vibration experiment device based on friction pendulum and experiment method thereof

A technology of self-excited vibration and experimental device, which is used in measurement devices, vibration testing, and testing of machine/structural components, etc., can solve the problem that the linear movement of the table 23 is limited, and the phenomenon of self-excited vibration cannot be analyzed and researched, and the model cannot be It has practical value and other issues, and achieves the effect of simple structure, easy popularization and application, and low cost.

Inactive Publication Date: 2014-10-22
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 The device is just a theoretical model to explain the phenomenon of self-excited vibration. 11 is the driving pulley, 12 is the transmission belt, 13 is the driven pulley, 14 is the tension spring, and 15 is the sliding block; The model cannot be of practical value
image 3 In the existing friction self-excited vibration experimental device shown, 21 is the bed of the machine tool, 22 is the rolling body, 23 is the workbench, 24 is the tension spring, and 25 is the sliding block. This device has been used for a long time in the machine tool Research on the phenomenon of unsteady motion of sliding parts, but the straight-line movement of the worktable 23 is extremely limited, and the moving speed of the worktable 23 cannot be guaranteed to be constant at the beginning and end of the movement, which makes it impossible for researchers to Continuous analysis and research on self-excited vibration phenomena

Method used

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  • Friction self-excitation vibration experiment device based on friction pendulum and experiment method thereof
  • Friction self-excitation vibration experiment device based on friction pendulum and experiment method thereof
  • Friction self-excitation vibration experiment device based on friction pendulum and experiment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A frictional self-excited vibration experimental device based on a friction pendulum, comprising a friction pendulum, a bushing 4, a speed-regulating motor, a dynamic strain gauge, and a computer, wherein the friction pendulum comprises a pendulum block 1, a pendulum bar 2, and a pendulum ring 7. The shaft sleeve 4 described above is fastened on the speed-regulating motor shaft 5, and the radial runout of the outer circle of the shaft sleeve 4 is ≤0.005mm; the swing ring 7 is set on the outer circle of the shaft sleeve 4, and the swing ring The inner hole of 7 is slidably fitted with the outer circle of the shaft sleeve 4, and the pendulum ring 7 and the pendulum block 1 are connected together in a threaded manner through the pendulum bar 2, and the two sides of the upper part of the pendulum bar 2 are respectively The strain gauge 3 is attached, and the lead-out line of the strain gauge 3 extends upwards close to the swing rod 2 and the swing ring 7 and is connected to ...

Embodiment 2

[0044] A friction self-excited vibration experimental method based on friction pendulum, the method comprises the following steps:

[0045] A. Calibrate the readings of the dynamic strain gauge;

[0046] B. Start the speed regulating motor, the speed regulating motor shaft 5 rotates together with the shaft sleeve 4, and the outer surface of the shaft sleeve 4 drives the pendulum ring 7 to rotate in the same direction through friction; the pendulum ring 7 together with the pendulum rod 2 and the pendulum block 1 rotates through a certain angle Finally, under the action of gravity, the pendulum block 1, the pendulum bar 2, and the pendulum ring 7 quickly swing back; after the pendulum speed decreases, the friction force in the pendulum ring 7 will play a role again to make the friction pendulum start to swing in the next cycle;

[0047] C. Record and analyze the swing law of the friction pendulum through the dynamic strain gauge and the computer. The swing law includes swing amp...

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Abstract

Disclosed are a friction self-excitation vibration experiment device based on a friction pendulum and an experiment method thereof. The device includes the friction pendulum, a shaft sleeve, a speed regulation motor, a dynamic strain gauge and a computer. The friction pendulum includes a swing block, a swing rod and a swing ring, which are connected together. The shaft sleeve is installed on a shaft of the speed regulation motor. The swing ring sleeves externally the shaft sleeve. Strain foils are pasted on the two sides of the swing rod. The strain foils are connected with the dynamic strain gauge and the computer through wiring piles and wires. The method includes the following steps: A. the read number of the dynamic strain gauge is calibrated; B. the speed regulation motor is started so that the motor shaft rotates with the shaft sleeve which drives the friction pendulum to rotate in the same direction and the friction pendulum swings back rapidly after rotating for a specific angle and after the swing speed is reduced, the friction pendulum starts swing of a next period; C. through the dynamic strain gauge and the computer, the swing rule of the friction pendulum is recorded and analyzed. The friction self-excitation vibration experiment device based on the friction pendulum and the experiment method thereof are capable of scientifically, reasonably and continuously researching a friction self-excitation vibration phenomenon and the device is simple in structure, simple and convenient to operate, low in cost and easy to popularize and apply.

Description

technical field [0001] The invention relates to an experimental device and an experimental method thereof, in particular to a friction pendulum-based friction self-excited vibration experimental device and an experimental method thereof. Background technique [0002] When the external non-oscillating energy is converted into the oscillating energy in the nonlinear system, the vibration of the system is called self-excited vibration. Self-excited vibration is a fairly common phenomenon in nature and mechanical engineering. Its most notable feature is that once the external energy supply of the system is cut off, the vibration will disappear immediately. In most cases, nonlinear mechanical systems contain sliding friction pairs, so self-excited vibration can also be called friction self-excited vibration. [0003] Frictional self-excited vibration is often accompanied by high frequency noise. This kind of vibration and noise will cause serious harm to the service life of mec...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01M7/02
Inventor高中庸黄嫦娥高尚晗
OwnerGUANGXI UNIVERSITY OF TECHNOLOGY