Abstract
This work studies the vibration isolation of a single degree of freedom (SDOF) quarter car model under the influence of the magnetic field strength of electromagnet of a hybrid electromagnet (EM) and permanent magnet (PM) combination. Furthermore, the time history plot helps to study the influence of the relative movement of the electromagnet and the permanent magnet on the top plate, base plate, stiffness of the system and damping coefficient. A laboratory scale model of a SDOF quarter car with a hybrid magnet is tested on an open loop type shaker table at different frequencies of base excitation. Data acquisition and analysis have been carried out with the aid of two piezoelectric accelerometers and Lab VIEW software. Also, the theoretical analysis is carried out in MATLAB Simulink. From the experimental and Simulink results, it is found that the repulsive force between the electromagnet and permanent magnet varies the base and top plate amplitude, the stiffness of the system and damping coefficient of the suspension elements.
Highlights
The suspension system of a vehicle plays a vital role to support the body weight and provide comfort by isolating the body from road-induced vibrations
The hybrid magnet reduced the vertical displacement of the top plate of single and two degrees of freedom vibration isolation with the use of hybrid magnet was more compared to the conventional suspension system [6, 7]
As the field strength of the permanent magnet (PM) and EM is not uniform throughout the vicinity, the variation on the top surface of the EM and PM has been noted with the help of a Hall probe Gauss meter
Summary
The suspension system of a vehicle plays a vital role to support the body weight and provide comfort by isolating the body from road-induced vibrations. A conventional suspension system which uses springs and dampers has certain limitations because of the fixed stiffness and damping coefficient of the elements. Many research works reveal the variation of the stiffness and damping coefficients of suspension elements [1,2,3,4]. The hybrid magnet works on levitation principle which varies the damping and stiffness of the system. Such magnets in combination with conventional passive elements show promising performance. The hybrid magnet reduced the vertical displacement of the top plate of single and two degrees of freedom vibration isolation with the use of hybrid magnet was more compared to the conventional suspension system [6, 7]. The vibration isolation system consisting of a standard helical coil spring and some iron (ferrite) particles layers stacked with PM and EM under disturbance cancellation control and the isolation of vibrations from the base to be almost zero [8]
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