Rigidity-adjustable magneto-rheological vibration isolation device for multi-rotor vehicle body

Abstract

The invention belongs to the technical field of structural vibration isolation, and discloses a rigidity-adjustable magneto-rheological vibration isolation device for a multi-rotor vehicle body. The device is characterized in that at least one rigidity-adjustable magneto-rheological vibration isolator is uniformly arranged between an upper panel and a lower panel of the aircraft body; the magneto-rheological vibration isolator comprises a magnetic isolation base and a magnetic conduction shell, an iron core is mounted in the center of the magnetic conduction shell, and the bottom of the iron core is connected to the magnetic isolation base through a spring; a magneto-rheological elastomer is arranged between the iron core and the magnetic conduction shell; the middle part of the magneto-rheological elastomer is separated by a magnetic isolation plate; and a coil and a permanent magnet are mounted in an annular space in the magnetic conduction shell, the direction of a magnetic field generated by the coil is opposite to that of a magnetic field generated by the permanent magnet, and the magnetic field of the permanent magnet can be counteracted. According to the invention, a ceramicmagnet is used as the permanent magnet, a constant magnetic field is provided when the multi-rotor unmanned aerial vehicle flies normally, and the rigidity of the rack is guaranteed; under the condition that the multi-rotor unmanned aerial vehicle is subjected to great vibration, the magnetic field is adjusted by the coil, the rigidity of the magneto-rheological material is changed in real time,and the purpose of vibration isolation is achieved.

Description

technical field [0001] The invention belongs to the technical field of structural vibration isolation, and in particular relates to a magneto-rheological vibration isolation device for a multi-rotor fuselage. Background technique [0002] Multi-rotor UAV has the advantages of low mechanism complexity, high actuator response speed, and large power safety redundancy. With its wide application in border inspection, precision agriculture, environmental remote sensing and other fields, vibration analysis and vibration reduction research has become a multi- The key to the further development of rotorcraft. The main vibration sources of the multi-rotor UAV are the motor and the propeller, and the vibration excitation generated by it is transmitted to the center of the fuselage disc through the UAV arm, causing the sensor to vibrate; in addition, when encountering strong wind interference, excessive landing speed, etc. Situations can also cause strong vibrations of the fuselage. T...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the traditional vibration isolator is difficult to adjust the stiffness parameters, can only be aimed at a single vibration situation, and cannot adapt to the defect of the complex vibration environment of the fuselage of the multi-rotor UAV. The stiffness-adjustable magneto-rheological vibration isolation device consists of one or more magneto-rheological vibration isolators installed between the upper and lower panels of the fuselage. The magnetorheological vibration isolators use ceramic magnets as permanent magnets. In multi-rotor Provide a constant magnetic field during normal flight of the UAV to ensure the rigidity of the frame; when the multi-rotor UAV is subjected to large vibrations, the magnetic field is adjusted by the coil to change the stiffness of the magnetorheological material in real time to achieve the purpose of vibration isolation

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