Study On The Mechanism Model And Structural Design Optimization Of MRFCs (Magnetic-Rheological Fluid Couplings)

In order to solve the large heavy duty machinery exists in the process of the transmission shaft vibration and shock caused by related institutions in the process of destruction of the parts,a multi-layer disc type which work area for the corrugated structure of MRFCs(Magneto Rheological Fluid Couplings)in this paper to suppress the vibration impact.This paper will design the structure of magnetorheological fluid coupling and coupling research applied to the shaft driving system of heavy machinery in damping properties,the specific research contents are as follows:First,the integrated mechanism model of MRFCsis built on the basis of magnetorheological fluid constitutive.Two-mass vibration system model is established,and the necessary conditions to meet safety gear couplings in the system are initially proposed.Based on the study of shear mode magnetorheological fluid devices,two typical single-layer distribution structure types(drum and disc)MRFCs are specific designed.Excitation coil distributed manner and structure form of MRF workspace which belonged more simple and efficient disc couplings are presented,and maximum torqueswhich each couplings can transmit are calculated based on the relationship of magnetic induction direction and axial direction.Based on solid-liquid two-phase of MRF in the working field,as well as the main characteristic parameters of its constitutive characteristics,such as magnetic field induced yield stress and zero viscosity,yield stress adjustable ratio which is one of the main properties to check indicators of MRFCis presented.Second,the specific structuresof geometry and the magnetic circuit of MRFCs are designed.There are two main aspects in MRFC's design,which are geometry structural design and structural design of the magnetic circuit.Two types of couplings are carried out a detailed analysis and theoretical derivation formula in this paper.Stable drive torque calculation model is established and basic geometry parameters of two types of coupling are determined based the working principle of MRFCs.Important results of design parameters are discussed in detail during research process,such as the intensity of the excitation current,the coil turns,etc.,which based on the principle of electromagnetic design of MRFCs.The work area of MRFCs corrugated outer wall using a modified structure that can deliver stable torque comparative analysis,and thus determining the final parameters of the theoretical structure of two types of coupling.The rated transmission torque of MRFCs is up to 30~40k N·m.Finally,the correctness of numerical results of this article theoretical formula are verified bythe magnetic circuit structure simulation analysiswith the ANSYS finite element software.Third,vibration properties of MRFCsis analyzed.By the case studies which established the MQ3235 portal crane slewing mechanism vibration system dynamics model,with ensuring the completion of the drive coupling,the maximum instantaneous vibration coupling efficiency can reach 15% which compared and analyzed with the system which used all rigidly coupled rotating mechanism.In this paper,through the model of coupling mechanism of antithetical couplet and numerical optimization analysis of structure,specific ideas for the MRFCs' design which applied to the field of large torque transmission is provided,and a feasible method to analysis the vibration propertiesof MRFCsis proposed.