| Displacement sensor,speed sensor,or acceleration sensor is often installed with magnetorheological damper(hereafter referred to as MRD)to make a closed loop control system to control vibration accurately in industrial applications.However,the separate installation between a sensor and a MRD requires more space for complex installation which will cause higher maintenance cost.And the external sensor is easy to be affected by open air temperature,pressure,impact and other environmental factors,which will reduce the system’s reliability.In this paper,a new displacement differential self-induced magnetorheological damper(hereafter referred to as NDDSMRD)is designed through integrating displacement detection and controllable damping force functions in traditional MRD.This design of function integration of magnetorheological technology and differential self-induction technology will require smaller system installation space and reduce maintenance cost while improving system reliability and utility.In this paper,a new piston head structure and damping signal cylinder are designed.The piston head’s inner notch is enwound with damping excitation coil,and its outer notch is enwound with signal excitation coil,so that a damping magnetic field and a signal excitation magnetic field can be generated at the same time.In this design the damping signal cylinder,which has both damping force outputting and displacement induction functions,is the core component of the NDDSMRD.This paper focuses on the influence that a damping signal cylinder made of different permeability magnetic materials will exert on NDDSMRD’s damping and induction performance.The main study includes:(1)Put forward the structure model of NDDSMRD,established the corresponding mechanical model,and analyzed relationship of the induced electromotive force and displacement in differential displacement sensing principle.Detailed described design and calculation process of components in the NDDSMRD structure,analyzed the magnetic resistance calculation in the magnetic circuit on the basis of the structure parameters.(2)The static magnetic field simulation model of NDDSMRD of damping signal cylinder made of different permeability magnetic materials is built with the engineering simulation software ANSYS to obtain the curve relation between control current and damping magnetic field of NDDSMRD.Harmonic magnetic field of the NDDSMRD is simulated with ANSYS’s electromagnetic coupling field simulation model,and linear proportional relation between piston displacement and self-induction voltage amplitude is obtained.According to the established NDDSMRD mechanical model and the data collected from damping magnetic field simulation,the dynamics simulation analysis of NDDSMRD of damping signal cylinder made of different permeability magnetic materials is carried out with Matlab/Simulink,and this paper comes to an initial inclusion that the designed damper can meet the requirement of function integration.(3)This paper establishes a displacement signal acquisition system of the damper with the systems engineering software Lab VIEW and verifies the displacement self-induction performance of NDDSMRD of damping signal cylinder made of different permeability magnetic materials.Also,the damper’s dynamic performance test-bed is built and used to test and analyze the dynamic performance and displacement self-induction of the NDDSMRD.As the result shown,the damping signal cylinder made of 10# steel material can improve the damping performance of the damper but will greatly weaken its self-induction performance.The damping signal cylinder made of stainless steel will not only effectively improve its self-induction performance,but also keep the fundamental damping function stable.By changing the structure and material of the damper,the damping force and induction voltage outputting function can be increased effectively,and MRD’s performance is improved.This has verified the feasibility of the function integration design of NDDSMRD. |
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