Research On Rheological Performance Degradation Law And Modeling Method Of Electrorheological Fluid In Disc Electrorheological Damper

As a new type of intelligent electronic control material,electrorheological fluid has gradually become a research hotspot because of its rheological properties showing transient、reversible and continuity under an electric field.The rheological properties of electrorheological fluids are the basis and core of electrorheological technology,making electrorheological fluids with excellent performance a key factor in the marketization of electrorheological technology.At present,many scholars’ research on electrorheological fluids focuses on mechanism research,performance optimization,microscopic modeling and engineering application research.However,in the actual application of electrorheological fluids in engineering practice,the complexity caused by the different working environment and material properties is often ignored.There are many factors that affect the rheological properties of electrorheological(ER)fluids under an electric field and cause the degeneration of ER properties.Therefore,it is necessary in order to conduct a systematic,comprehensive and in-depth analysis of the degradation law of the rheological properties of electrorheological fluids.The main research work of this paper is as following:(1)With reference to relevant literature,the current research status of electrorheological fluids and degradation models are described,and the engineering application based on electrorheological effects and its development prospects are discussed.The composition and performance evaluation indexes of the electrorheological fluid are summarized and analyzed,and the dynamic shear yield stress is used as a measure of the rheological performance of the electrorheological fluid.Explore the influencing factors that cause changes in the rheological properties of electrorheological fluids,and analyze the impact mechanism.(2)Combining the structural characteristics and design experience of existing dampers at home and abroad,a disc type electrorheological damper is designed through CATIA three-dimensional software,its structure and working principle are explained in detail,and the parts of the disc type electrorheological damper are processed.The electric field simulation analysis of this electrorheological damper was carried out by Comsol simulation software,and the influence of different electric field application methods on the degradation experiment was explored.Based on the structure parameters of the damper,the transformation formula between the damping moment produced by the disc er damper and the dynamic shear yield stress produced by ER fluid is established.(3)The assembled disc type electrorheological damper is used as an electrorheological performance degradation device to build an electrorheological performance monitoring experimental platform.According to the required monitoring performance indicators,the standard modules of the test bench are selected,and assembly spacing of the damper is adjusted and measured,and finally verify the performance of the monitoring test bench.(4)A single-factor experiment was designed,and the influence of electric field strength,damping disk speed,Initial temperature and measurement interval on the degradation of the rheological performance of electrorheological fluid were sequentially analyzed.And the degradation data are dealt with and analyzed,and a random effect Wiener degradation process model with measurement error is established.The parameters of the model are identified and the reliability is evaluated by MATLAB.