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Local resonance type vibration isolation system for low-frequency vibration reduction of precise instrument

A technology of local resonance and precision instruments, which is applied in the direction of shock absorbers, shock absorbers, springs/shock absorbers, etc., can solve the problems of narrow vibration reduction frequency band of vibration absorbers, and can not achieve the vibration reduction effect, so as to facilitate processing , Excellent low-frequency vibration isolation, the effect of suppressing low-frequency vibration

Pending Publication Date: 2020-12-04
NAVAL UNIV OF ENG PLA
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AI Technical Summary

Problems solved by technology

[0003] In the actual engineering application process, the complex and changeable working environment puts forward higher requirements on the effective vibration reduction range of the vibration absorber. The vibration reduction frequency band of a single type of vibration Unable to achieve ideal vibration reduction effect

Method used

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  • Local resonance type vibration isolation system for low-frequency vibration reduction of precise instrument
  • Local resonance type vibration isolation system for low-frequency vibration reduction of precise instrument
  • Local resonance type vibration isolation system for low-frequency vibration reduction of precise instrument

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Embodiment 2

[0112] (2) Dioscillator cell (M=3, N=2). The six vibration absorbers evenly arranged on the beam are defined as three local resonance cells, and each cell contains two oscillators, assuming that the mass ratio of the oscillators in the cell is μ 1 , μ 2 , the natural frequency ratio of the vibrator is γ 1 , γ 2 , the damping ratio of the vibrator is ζ 1 , ζ 2 , where μ 1 =μ 2 = 0.16. The particle swarm optimization algorithm is used to optimize the natural frequency ratio and damping ratio of the vibrator, and the optimized vibrator parameters are shown in Table 3.

[0113] Table 3 Parameters after optimization of the double oscillator cell

[0114]

[0115] Bringing the optimized parameters into the vibration equation (Equation 7) can obtain the variation curve of the vibration amplitude of the precision instrument with frequency as shown in Figure 9 shown.

[0116] Depend on Figure 10 It can be seen that the dual-oscillator cell has more superior vibration re...

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Abstract

The invention discloses a local resonance type vibration isolation system for low-frequency vibration reduction of a precise instrument. The local resonance type vibration isolation system comprises asimply supported beam and the precise instrument mounted on the simply supported beam, and the precise instrument is mounted on the upper surface of the simply supported beam in a vibration isolationmanner; M local resonance cells are further periodically arranged on the upper surface of the simply supported beam in the axial direction, and each local resonance cell comprises N vibration absorbers; and M*N vibration absorbers are arranged at equal intervals, and the precise instrument is arranged between any two adjacent vibration absorbers. According to the local resonance type vibration isolation system, low-frequency vibration of the precise instrument can be effectively restrained, the local resonance type vibration isolation system is composed of local resonance cells arranged on the beam and the precise instrument, the local resonance cells comprise a plurality of different vibration absorbers, and therefore the effective vibration reduction range and the vibration reduction efficiency of the vibration absorbers can be greatly improved, and an excellent low-frequency vibration isolation effect is achieved; and the system is simple in structure and convenient to machine, install and maintain in the later period, and the application cost is reduced.

Description

technical field [0001] The invention relates to the technical field of low-frequency vibration control, in particular to a local resonance type vibration isolation system used for low-frequency vibration reduction of precision instruments. Background technique [0002] Vibration is one of the important environmental factors that affect the measurement accuracy of precision instruments, and low-frequency vibration is difficult to eliminate and has far-reaching effects. Therefore, it is of great significance to effectively suppress the low-frequency vibration of precision instruments. Among the commonly used vibration reduction methods at present, the vibration absorber can realize the vibration reduction performance of low-frequency broadband and has been widely studied and used. The basic working principle of the vibration absorber is to arrange a resonant sub-system including damping, stiffness, and mass at a specific position on the main vibration system, that is, a vibra...

Claims

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Application Information

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IPC IPC(8): F16F15/00F16F15/02F16F15/22F16F7/116
CPCF16F7/116F16F15/002F16F15/02F16F15/22F16F2222/08
Inventor 董理郭彭周奇郑高晟耀张健
Owner NAVAL UNIV OF ENG PLA
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