Design Of Bottom-mounted Dual-Channel Magnetorheological Damper And In-situ Settlement Monitoring

There is a large density difference between the solid particles of the magnetorheological fluid and the carrier fluid.Under the action of gravity,the sedimentation of the magnetorheological fluid is inevitable.The settlement problem of magnetorheological fluid seriously limits the application and promotion of magnetorheological fluid.Most of the existing anti-settling measures are to improve the problem of magnetorheological fluid settlement from the perspective of materials.Although the suspension stability of magnetorheological fluid can be improved to a certain extent,the symptoms are not permanent.After long-term static magnetorheological fluid,the settlement is still will happen.From the device level,this paper proposes a structure design of bottom-mounted dual-channel double-tube damper that can effectively achieve operational dispersion,and conducts rheological analysis modeling and related experimental research;at the same time,in view of operational dispersion According to the needs of perception,the in-situ monitoring method of magnetorheological fluid settlement based on the capacitance of an open plate is proposed and implemented for the structural design of a double-channel double-tube damper at the bottom.Based on the in-situ monitoring of settlement,the bottom-mounted dual-channel double-tube damper is put into operation at the right time to achieve the effective redispersion of the settled magnetorheological fluid,which can ensure the long-term reliable service of the damper.The specific research contents are as follows:(1)Introduce the sedimentation process of magnetorheological fluid,determine the particle sedimentation factors through single particle stress analysis,and proceed from the kynch sedimentation model to complete the derivation of the solid flux density function,and discuss the sedimentation rate model and two methods to determine the settlement compression point methods.(2)Put forward the concept of device operation redistribution technology,design the structure of the bottom double-channel double-tube damper,and theoretically analyze the principle of settlement redistribution.The device settling and dispersion verification experiment was designed to prove the feasibility of device settling and redispersing technology.(3)Determine the key design parameters of the damper according to the installation environment of the damper.The Newtonian fluid zero-field modeling is performed on the damper,and the relationship between the damping force and the piston speed is analyzed.Based on ANSYS simulation analysis of different current excitation control strategies applicable scenarios.The rheological modeling of the basic working mode of the damper was carried out,and the relationship between the damping force and the excitation current of the damper under the action of the magnetic field was analyzed according to the modeling results.(4)Based on the structure of the double-channel double-tube damper at the bottom and the working environment and state of the magnetorheological damper,the in-situ settlement monitoring technology research based on the principle of open plate capacitance is proposed and carried out.Based on the sedimentation monitoring results,the sedimentation rate model of the magnetorheological fluid sample and the sedimentation compression point of the magnetorheological fluid sample were determined.