The invention discloses a
magnetorheological damper with a built-in magnetorheological valve for damping
performance control, which mainly comprises a
piston rod, a
piston cylinder, a
damper cylinder body, a valve core, a floating
piston, end covers, lifting lugs and the like. The
piston rod, the
damper cylinder body, the valve core, an
excitation coil, cylinder liquid flow passages, and U-type liquid flow passages form the built-in magnetorheological valve. When the
excitation coil is conductive, flowability of magnetorheological liquid inside effective damping gaps of the cylinder liquid flow passages and the U-type liquid flow passages is reduced due to electromagnetic effects, a
pressure difference is formed between a first magnetorheological liquid accommodating cavity and a second magnetorheological liquid accommodating cavity, a damping force applied to the right end surface of the piston head changes, and the purpose that the magnetorheological valve controls the damping performance of the
magnetorheological damper is realized. Due to the U-type liquid flow passages, the damping length is effectively increased, and the damping force adjustable range is increased. The
magnetorheological damper is particularly suitable for being applied to a shock absorption
system for a railway, a
train, a bridge and the like, and has the advantages of large adjustment range, compact structure and small size.