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
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[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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