A normal stress electromagnetic vibration platform with controllable stiffness and control method

Abstract

The invention discloses a rigidity-controllable positive stress electromagnetic vibration platform and a control method. The positive stress electromagnetic vibration platform is characterized by comprising a vibration platform, a base, and a cantilever beam support structure for connecting the vibration platform with the base. The positive stress electromagnetic vibration platform further comprises positive stress electromagnetic actuators fixed between the platform and the base; a cross mass block, an actuation rod, a combination spring and a pretightening device are connected to the positive stress electromagnetic actuators in sequence; the positive stress electromagnetic actuators are symmetrically arranged around the cross mass block; and a guide sleeve is mounted at the lower end ofthe vibration platform, so that the actuation rod moves in the vertical direction along the guide sleeve. The positive stress electromagnetic vibration platform uses a capacitance displacement sensorfor monitoring vibration platform displacement signals, and uses the positive stress electromagnetic actuators for generating electromagnetic positive stress directly proportional to the vibration displacement for serial compensation of elastic force of springs to realize control of the elastic force and rigidity control of a vibration system; and the positive stress electromagnetic vibration platform is compact in structure, wide in frequency band range, convenient to install and simple in operation.

Description

technical field [0001] The invention relates to the technical field of active and passive vibration control, and specifically designs a normal stress electromagnetic vibration platform with controllable stiffness and a control method. Background technique [0002] In the vibration engineering environment, for the control of structural vibration, it is difficult to achieve the expected control effect by using passive suppression methods, while active control technology has obvious advantages in vibration suppression compared with passive control. As a linear drive element, the voice coil motor has a large actuation stroke, no hysteresis, low drive voltage, and no transmission gap. It is widely used in active vibration control. However, when the mass of the controlled object is large and it is necessary to maintain a large actuation stroke, a large current is required to generate the required output force, resulting in large power consumption and coil heating even under quasi-...

AI Technical Summary

Problems solved by technology

However, when the mass of the controlled object is large and it is necessary to maintain a large actuation stroke, a large current is required to generate the required output force, resulting in large power consumption and coil heating even under quasi-static conditions. serious

Due to the limitation of power consumption due to the application requirements of the vibration control object, the vibration platform based on the driving mode of the voice coil motor can only have a small overall structural rigidity, and the anti-overload ability is poor, which cannot meet the requirements of a large structural rigidity.

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