Micro scale method for calibrating dynamic yield variability of magnetorheological fluid

Abstract

The invention discloses a micro scale method for calibrating dynamic yield variability of a magnetorheological fluid. The method comprises the following steps of: setting magnetorheological fluid material parameters emulated by molecular dynamics according to researched objects; building a langevin equation of suspended particles motion under multiple fields of coupling action, and programming a large scale molecular dynamics emulation program; evolving and simulating the micro structure of the magnetorheological fluid according to the emulation program; building a macro yield stress model with random motion information of micro particles, evolving the emulation result according to the micro structure of the magnetorheological fluid, and performing statistics to acquire a stress-strain constitutive relationship with non-linear fluctuation and random fluctuation; and building a Bingham shear rate constitutive model with random parameters, and identifying the random parameters in the Bingham module by using a least square fitting regulation, and calibrating the variability. By the method of the invention, the traditional phenomenology calibrating method based on testing and analysisis changed so as to provide a deep recognition for designing and optimizing the control elements of the magnetorheological fluid.

Description

technical field [0001] The invention belongs to the field of engineering technology and material science, and relates to a microscale method for calibrating the dynamic yield variability of magnetorheological fluid. Background technique [0002] As an important component of structural control, magnetorheological dampers based on magnetorheological fluids (MRF) have been widely used and studied in recent years. Magnetorheological fluids are generally composed of micron-sized particles with high magnetic permeability and non-magnetic fluids, and have fast and completely reversible phase change characteristics. When an external magnetic field is applied, the suspended particles are magnetized into magnetic poles, and the particles interact to form chains, clusters, and wall structures. This microstructural behavior can significantly enhance the viscosity of suspended particles, significantly change the flow field characteristics of magnetorheological fluid, and has good contro...

AI Technical Summary

Problems solved by technology

Careful analysis shows that mesoscale methods are often based on ideal assumptions and cannot reflect the physical nature of dispersed-suspension interactions and their random fluctuations; macroscale methods are all phenomenological methods that rely on experimental analysis and lack understanding of the nature of random fluctuations. reveal

However, the existing micro-scale molecular dynamics simulation methods are mostly limited to small-scale simulations, and often ignore the influence of Brownian motion

More importantly, the relationship between the random fluctuation of particles at the microscopic scale and the dynamic yield variability at the macroscopic scale has not been mentioned in the relevant literature

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