A Composite Magnetorheological Elastomer Negative Stiffness Shock Isolator

Abstract

The invention discloses a composite structure magnetorheological elastomer negative rigidity shock isolator which comprises an upper connecting plate, an upper cover plate, an annular magnetorheological elastomer, a butterfly spring, a coil, a first sleeve, a lower connecting plate, a lower bottom plate, a permanent magnet, a laminated magnetorheological elastomer, a second sleeve, an accelerationsensor, a DSP controller and a current driver. Under normal conditions, the permanent magnet provides a strong magnetic field to ensure that the magnetorheological elastomers have large initial rigidity, that is, to ensure that a system has high static rigidity, and the stability of the structure is increased, while the butterfly spring, the annular magnetorheological elastomer and the laminatedmagnetorheological elastomer provide high bearing capacity; when an earthquake occurs, the acceleration sensor transmits a vibration signal to the DSP controller, and the DSP controller controls the current driver to supply power to the coil which provides a reverse magnetic field, the rigidity of the magnetorheological elastomers is reduced so as to reduce the rigidity of the system to enable thesystem to provide larger horizontal displacement and change the natural frequency to achieve the purpose of vibration reduction and shoke isolation.

Description

technical field [0001] The invention relates to basic shock-isolation equipment, in particular to a negative-stiffness shock-isolator of magnetorheological elastic body with composite structure. Background technique [0002] The occurrence of earthquakes is uncertain and unpredictable, and it is precisely because of this that it poses a huge threat to people. The main reason for the damage caused by the earthquake is that the huge energy input by the earthquake is released in the form of waves, causing the building to shake violently and damage the components. Studies have shown that the key to seismic isolation is to isolate the source of the earthquake, not to dissipate the seismic energy. The optimal seismic isolation effect is that the deformation only occurs in the seismic isolation system or the building above the seismic isolation system moves as a whole while avoiding resonance. [0003] The optimal seismic isolation system should have sufficient vertical bearing c...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a composite structure magneto-rheological elastomer negative stiffness shock isolator, which overcomes the fact that the traditional laminated rubber shock-isolating bearing can only function as a shock-isolation for earthquakes of a specific frequency band, and the current magneto-rheological elastomer shock-isolation The stiffness of the device and the coil current can only be positively correlated

Images