Abstract
Protecting drive systems from pressure spikes or drops is an important task as it aims to preserve the integrity of hydraulic lines/equipment and the stability of operating parameters. As control equipment with mechanical valves is often used in high pressure magnetorheological drive systems, their protection from hydraulic impact is extremely relevant. This research paper describes a technique for protecting drive systems from hydraulic impacts with the help of magnetorheological devices and their design. The authors describe a number of ways to set the control signal for the original magnetorheological device, which can help prevent pressure spikes in two different ways. It can either be realized through the use of unevenly distributed electromagnetic field and viscosity in the volume of magnetorheological fluid or with the help of a travelling magnetic field which excites longitudinal acoustic waves in the volume of magnetized fluid thus neutralizing the shock wave. The first option is based on dissipation of mechanical energy with the viscous fluid, while the second option is based on the effect observed when overlapping the shock wave and the control wave which have the same frequency and amplitude but are in phase opposition. Viscosity to velocity ratios are specified which are necessary for control. Since the antiphase method is characterized with good dynamics and small transient time values, a numerical model was developed which can be used to calculate the characteristics of the control acoustic wave, as well as the required parameters of the travelling electromagnetic control field. The results of a numerical experiment confirmed the effectiveness of the proposed method and the consistency of the numerical model described.
Keywords
Protection of drive systems, hydraulic impact, magnetorheological devices, travelling magnetic fields, dissipation of mechanical energy.
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