An internal bypass magnetorheological damper (MRD) with twin cylinders (Bai et al., 2013, Magnetorheological damper utilizing an inner bypass for ground vehicle suspensions, IEEE Transactions on Magnetics, 49(7): 3422-3425) was proposed for both vibration and shock control systems. In the internal bypass MRD, the gap between the inner and outer cylinders is the flow gap for MR fluids. The coil winding is wound on the inner cylinder to provide the electromagnetic field. The mechanical responses of the internal bypass MRD, including the controllable damping force and response time, are modeled and analyzed in this paper. The corresponding experimental tests are carried out to validate using selfdeveloped test systems.
Aim at simultaneously improving the safety (anti-roll performance) and ride comfort of vehicles during fast cornering or
over road irregularities, the principle and configuration of magnetorheological (MR) semi-active stabilizer bar is proposed
in this paper. The MR stabilizer bar featuring a rotary MR damper is used to provide small torsional torque at low speed
to improve ride comfort, while large torsional torque to enhance the safety at high speed cornering. To verify the feasibility
and effectiveness of the proposed MR stabilizer bar, the mathematical model of the dynamic system is established, and the
passive-on control performance of a specific full vehicle is studied via a dynamics simulation software ADAMS, and the
performance is compared with the conventional passive stabilizer bar for ground vehicle dynamic system.
KEYWORDS: Process modeling, Optimization (mathematics), Data modeling, Analytical research, Systems modeling, Head, Motion models, Safety, Visual process modeling, Complex systems, Finite element methods
In order to study how vibrations from ground vehicles/aircraft will impact on the seated occupants, it is of significance to develop an effective biodynamic model for the seated occupants. In this paper, a wide variety of 4-degree-of-freedom (4- DOF) lumped-parameter models for a seated occupant is investigated. A linear 4-DOF model with 18 parameters is deduced and employed as an example. The parameters of the 4-DOF model are identified based on the Pareto optimization principle. The goodness of fit (ε) is established and employed to evaluate the effectiveness of the models. Then, all possible linear 4-DOF models are analyzed and discussed with the same parameters identification and effectiveness evaluation. The most-effective two models are obtained and compared with two other existing models. The research results show that: (i) The total types of linear 4-DOF models is limited and all the parameters of models are identifiable; (ii) The number of parameters of the 4-DOF models affects little on the goodness of fit (ε); and (iii) The presented models are more effective than the two existing models.
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