Magnetic steel piston type magneto-rheological damper with double ejection rods

Abstract

The invention discloses a magnetic steel piston type magneto-rheological damper with double ejection rods, comprising a working cylinder, a piston and two piston rods; the working cylinder is filled with magneto-rheological fluid; the piston is made of magnetic steel, two piston rods are both made of non-magnetic materials, a magnet exciting coil and a magnetizing-demagnetizing coil are wound in the middle of the piston, and the magnetic steel piston can be magnetized and demagnetized by controlling a power source, therefore, the magnetic steel piston has certain magnetic field intensity and the magnetic steel piston type magneto-rheological damper with double ejection rods has certain output damping force, and the output damping force of the magnetic steel piston type magneto-rheological damper with double ejection rods is regulated by changing the size and the direction of current input to the magnet exciting coil of the magnetic steel piston.

Description

technical field [0001] The invention belongs to a magneto-rheological damper, in particular to a magneto-rheological damper with double rods and magnetic steel pistons. Background technique [0002] Different from the single-rod magnetorheological damper, the damping force output by the double-rod magnetorheological damper is symmetrical. At the same time, the damping force output by the ordinary double-rod magnetorheological damper can be adjusted by controlling the power supply. Remote stepless adjustment, but this adjustment needs to consume electric energy at any time. Moreover, when the output current of the control power supply is zero (that is, the excitation current is zero), the ordinary double-rod magneto-rheological damper will have a gap between the piston and the working cylinder. The magnetic field strength in the gap is zero, and the viscosity of the magnetorheological fluid in the gap is the lowest and the damping force is small. The force is small and it is...

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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing double-rod magneto-rheological damper when the excitation current is zero, the damping force is small and the power consumption is large, the present invention proposes a double-rod magnetic steel piston-type magneto-rheological damper. The magnetic steel piston of the rod magnetic steel piston type magnetorheological damper can be magnetized or demagnetized by the control power supply at any time through the charging and demagnetizing coil. Therefore, firstly, the magnetic steel piston can reach the predetermined working magnetic field strength, and then Then adjust the magnitude and direction of the current output from the control power supply to the excitation coil on the magnetic steel piston, that is, make the direction and magnitude of the electromagnetic field generated by the excitation coil consistent with or opposite to the magnetic field of the magnetic steel piston, that is, by strengthening or weakening the magnetic steel piston The magnetic field strength is used to achieve the purpose of controlling the output damping force of the double-rod magnetic steel piston magneto-rheological damper. Since the magnetic steel piston has reached the predetermined working magnetic field strength or predetermined working strength after magnetization or demagnetization Therefore, the electric energy required for further adjustment of its output damping force will be greatly reduced and save energy. In addition, since the magnetic steel piston already has a certain working magnetic field strength after magnetization or demagnetization, once it is controlled If the power supply or piston excitation coil fails, the damping force output by the double-rod magnetic steel piston magnetorheological damper can still ensure the normal operation of the system

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