Quasi-zero stiffness electromagnetic vibration isolator suitable for ultralow-frequency vibration reduction and isolation

Abstract

The invention relates to a quasi-zero stiffness electromagnetic vibration isolator suitable for ultralow-frequency vibration reduction and isolation. The invention relates to the technical field of vibration control. When a vibration isolator is in a static balance position, upper and lower air gaps are equal, and the electromagnetic attraction of an upper stator assembly to a rotor assembly is equal to the electromagnetic attraction of a lower stator assembly to the rotor assembly. When the load tends to move upwards, the upper air gap is smaller than the lower air gap, the resultant force borne by the rotor assembly is upward, the upward movement trend is accelerated, the negative stiffness characteristic is shown, and a negative stiffness execution mechanism formed by the upper stator assembly, the lower stator assembly and the rotor assembly is connected with a positive stiffness spring in parallel to achieve quasi-zero stiffness. When the load tends to move downwards, the lower air gap is smaller than the upper air gap, the resultant force borne by the rotor assembly is downwards, the downward movement trend is accelerated, the negative stiffness characteristic is shown, and a negative stiffness execution mechanism formed of the upper stator assembly, the lower stator assembly and the rotor assembly is connected with the positive stiffness spring in parallel to achieve quasi-zero stiffness.

Description

technical field [0001] The invention relates to the technical field of vibration control, and is a quasi-zero-stiffness electromagnetic vibration isolator suitable for ultra-low frequency vibration reduction and isolation. Background technique [0002] As an important technology of vibration control, vibration isolation technology aims to take certain measures between the vibration source and the system, and install appropriate vibration suppression or vibration isolation equipment to isolate the direct transmission of vibration. Traditional passive vibration isolators can theoretically only be used for excitation frequencies greater than The vibration at twice the natural frequency of the system plays an attenuating role. With the continuous improvement of vibration isolation requirements, there is an urgent need for a vibration isolation technology that can maintain static support capacity and have low dynamic stiffness in a low-frequency environment. Therefore, quasi-ze...

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Problems solved by technology

The disk-type electromagnet mechanism has the characteristics of large electromagnetic force, fast pull-in, and less magnetic flux leakage, so it can be designed as a negative stiffness mechanism with a longitudinally symmetrical structure, but it will cause the following problems: In order to ensure that the vibration isolator has sufficient The static support capacity of the positive stiffness spring must be guaranteed to have sufficient compression space. At the same time, in order to ensure that the vibration isolator has a low dynamic stiffness, the negative stiffness mechanism is required to have a high negative stiffness, so the air gap of the electromagnet negative stiffness mechanism should not be too large. The above two requirements contradict each other when the positive and negative stiffness mechanisms are connected in parallel

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