Semi-active control quasi-zero stiffness parallel mechanism vibration isolation device and control method

Abstract

The invention discloses a semi-active control quasi-zero stiffness parallel mechanism vibration isolation device. The semi-active control quasi-zero stiffness parallel mechanism vibration isolation device comprises a Delta parallel mechanism with the negative stiffness characteristic, a vertical spring structure with the positive stiffness, a switch controllable damper, a vibration sensor and a computer; the Delta parallel mechanism with the negative stiffness characteristic comprises a static platform connected with an external foundation platform, a movable platform for bearing vibration-isolated equipment and branched chains; the vertical spring structure comprises a vertical spring and a vertical spring guide column; the two ends of the switch controllable damper are installed at the centroid position of the movable platform and the centroid position of the static platform through knuckle bearings, the movable platform and the static platform are respectively provided with a vibration sensor, the vibration sensors are connected with the computer through a preamplifier, and the computer is connected with the switch controllable damper. The invention further provides a control method of the semi-active control quasi-zero stiffness parallel mechanism vibration isolation device. According to the quasi-zero-stiffness parallel mechanism vibration isolation device, effective suppression of a low-frequency-band formant of the quasi-zero-stiffness parallel mechanism vibration isolation device can be achieved, and meanwhile the vibration isolation performance of a high frequency band cannot be changed.

Description

technical field [0001] The invention relates to a quasi-zero-stiffness parallel mechanism vibration isolation device with semi-active control, in particular to a semi-active control quasi-zero-stiffness parallel mechanism vibration isolation device and a control method. Background technique [0002] The safety and reliability of vehicle-mounted high-end measurement and control equipment put forward higher and higher requirements for the vibration isolation effect of vibration isolation devices. For low-frequency and ultra-low-frequency vibration isolation problems, the system is required to have a lower natural frequency and adopt quasi-zero stiffness The vibration isolation device is a good solution; for the multi-degree-of-freedom vibration isolation problem, the most common method is to connect multiple single-degree-of-freedom vibration isolation components in series to achieve multi-degree-of-freedom vibration isolation. The structure is complex and bulky, and the paral...

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Problems solved by technology

[0003] Patent CN 110778649A discloses a vibration isolation platform that can realize low-frequency vibration isolation in the three-degree-of-freedom direction, which directly deduces the Delta parallel mechanism into a negative stiffness mechanism, and obtains quasi-zero stiffness characteristics by parallel connection with vertical springs The vibration isolation platform realizes the organic combination of parallel mechanism and quasi-zero stiffness, and effectively solves the problem of three-degree-of-freedom low-frequency and ultra-low-frequency vibration isolation. The structure is simple and compact, but it also brings about an unavoidable problem in vibration isolation systems: easy produce low frequency resonance

Increasing the damping of the system is the most effective means to suppress the low-frequency resonance phenomenon of the system, but it will lead to the deterioration of the vibration isolation effect in the high-frequency band, resulting in the contradiction that different vibration isolation frequency bands have different requirements for damping.

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