Abstract
The application of magneto-sensitive (MS) rubber in a vehicle vibration control area is likely to be expected. This conclusion is based on the following two reasons: the maturity of fabrication of MS rubber which meets the application requirement and the feasibility of the constitutive model of MS rubber that accurately reflects its mechanical performance. Compared with the traditional rubber, small ferromagnetic particles are embedded in the elastomer of MS rubber, leading to a change of mechanical properties when an external magnetic field is applied. Therefore, devices with MS rubber, can be viewed as a semi-active actuator. In this study, MS rubber with a relative high increase in the magneto-induced modulus is fabricated and characterized. Furthermore, a one-dimensional constitutive model to depict the magnetic field-, frequency-, and strain amplitude-dependent dynamic modulus of MS rubber is applied. Finally, simulations of a MS rubber semi-active suspension under a bump and a random ground excitation with different control strategies on a quarter vehicle model are conducted to illustrate the feasibility of the MS rubber in the vehicle vibration control application context.
Highlights
The performance of vehicle suspensions is closely related to the automotive noise, vibration, and harshness (NVH) issue (Heißing and Ersoy, 2011)
After modeling the frequency and the strain amplitude dependence, the magnetic field dependence of the shear modulus of MS rubber depicted by a hyperbolic tangent function is included in the constitutive model
To reduce the static deformation of the MS rubber suspension caused by the preloading of the car body mass, a linear spring with a stiffness of 2,100 N m−1 is installed in parallel with the MS rubber-based suspension
Summary
The performance of vehicle suspensions is closely related to the automotive noise, vibration, and harshness (NVH) issue (Heißing and Ersoy, 2011). In order to predict the mechanical performance of MS rubber, constitutive models with strain and magnetic field strength as inputs and stress as output are needed. Liu et al (2020) used an adaptive neutral network control design method to simulate the control effect of the MS rubber-based seat isolator under a bump and a random road excitation. On the basis of the constitutive and inverse model, the H-infinity control strategy is used to simulate the vibration control effect of the MS rubber-based vehicle suspension under a bump and a random road excitation. The research in this study includes material fabrication, characterization, forward and inverse modeling, and simulation analysis, covering a broad application range for MS rubber in vibration control area. The forward constitutive model and the inverse model proposed can be used in other semi-active control scenarios
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