A Quasi-Zero Stiffness Inertial Actuator

Abstract

The invention discloses a quasi-zero rigidity inertia actuator which comprises a shell, a movable component and a driving component. The movable component is provided with a first supporting component and second supporting components, the first supporting component elastically supports the movable component in the vertical direction, the movable component transmits force to a base through the first supporting component, and the driving component transmits force to the base; and the at least two second supporting components are elastically connected with the movable component in the horizontal direction and are evenly arranged in the circumferential direction of the movable component, the first supporting component is in a static compression state or dynamic compression and stretching alternative state in the vertical direction, and the second supporting components are in a static compression state or dynamic compression state in the horizontal direction. The first supporting component forms a high-static low-dynamic rigidity supporting assembly, the inherent frequency of an assembly formed by the movable component, the first supporting component and the second supporting components can be reduced, the frequency can be close to zero frequency in the ideal state, and the low-frequency even ultra-low-frequency output of the actuator can be increased under the condition that the size and the input current are not increased.

Description

technical field [0001] The invention relates to the field of active vibration reduction, in particular to an inertial actuator with nonlinear support that increases the low-frequency output of the actuator. Background technique [0002] With the development of industry, people have higher and higher requirements for vibration control. Although the traditional passive vibration isolation technology has the advantages of simple structure and easy implementation, it also has its shortcomings that are difficult to overcome. frequency greater than The vibration reduction effect can only be achieved when the natural frequency of the vibration isolation system is doubled, but when the natural frequency of the system is too low, the problem of excessive static deformation and instability will be caused, resulting in the problem of low frequency vibration isolation. [0003] Vibration active control technology can overcome the above problems and has been developed rapidly. The ac...

AI Technical Summary

Problems solved by technology

The actuator is an important part of active control, which includes driving parts, moving parts and elastic supports. The driving parts use driving coils, and the moving parts form a closed magnetic circuit system. On the one hand, the output force of the actuator conforms to the left-hand rule, Its output is proportional to the magnetic field strength, current strength and wire length. In order to meet the use and installation requirements, the volume and current strength of existing actuators should not be too large, and the volume limits the magnetic field strength and wire length. Therefore, , the output of the existing actuators is generally small; on the other hand, the output frequency of the actuator is related to the elastic support, and its output frequency should be greater than the natural frequency of the assembly composed of movable parts and elastic supports. The authorized announcement number is CN104500647B The Chinese invention patent disclosed a double-layer active-passive electromechanical integrated vibration isolation device, which uses springs as elastic supports. Due to the low stiffness of the existing springs, its natural frequency generally cannot reach low frequencies or even ultra-low frequencies. Therefore, the existing The output frequency of the actuator cannot reach low frequency or even ultra-low frequency

In summary, the low-frequency output of the existing actuators is relatively small, so it is of great significance to develop an inertial actuator that increases the low-frequency or even ultra-low-frequency output of the actuator

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