Structural design and multi-objective optimization of a novel asymmetric magnetorheological damper

Abstract

The MRD with continuously adjustable damping, small compression, and large extension for asymmetric output may improve all-terrain vehicle (ATV) impact resistance and vibration reduction performance in a variety of conditions. A novel conical flow channel asymmetric MRD (CFC-MRD) is proposed to solve the structure complexity stroke sacrifice, and lack of failure protection concerns in currently studied asymmetric MRD structures. In the design, the non-parallel plate magnetic circuit characteristics of CFC-MRD are investigated, including theoretical analysis and finite element modeling, and the correctness of the model is proved by testing. Considerations in multi-objective optimization include special performance imposing extra restrictions, and making the work more complicated and prone to local optima. To address this, the Nelder-Mead approach is utilized, which decreases the complexity of the optimization model while simultaneously managing performance conflicts. A collaborative optimization strategy employing Comsol and Matlab tools is applied to improve optimization efficiency. The greatest difference between theoretical optimized values and real values is less than 6.77% in the experiments, showing the efficiency of the CFC-MRD structure design and optimization process.

Multi-condition adaptive detail characterization model of magnetorheological dampers and experimental verification

“…Hence, the influence of variation in vibration frequency and amplitude on v 1 can be linearly superimposed. According to above analyses, the quantitative relationship of v 1 can be represented by equation (5): Regarding the parameter v 2 , similar to v 1 , as depicted in figures 3(e1) and (e2), the increasing rate of v 2 decreases and v 2 eventually becomes stable with the increase of excitation current. However, unlike v 1 in some respects, the increasing rate of v 2 remains relatively small, not conforming to the characteristic of rapid increase of the exponential function; therefore, it is rational to equivalently characterize the relationship between v 2 and excitation current using a logarithmic function.…”

“…As a type of semi-active damper, the MRD can regulate the damping characteristics by adjusting excitation current [1][2][3], possessing advantages such as fast response speed, a wide adjustable range of damping force, and low power consumption [4][5][6][7]. It has a promising prospect in the field of vibration control and has been widely applied in fields such as vehicle suspension [8][9][10][11], human exoskeletons [12][13][14], buildings [15][16][17] and bridges [18][19][20].…”