By Yongle Li, Huoyue Xiang, Peng Hu, Bin Wang (auth.), Yi-Qing Ni, Xiao-Wei Ye (eds.)
This booklet includes the papers integrated within the complaints of the first overseas Workshop on High-speed and Intercity Railways (IWHIR 2011) held in Shenzhen and Hong Kong, China from July 19 to July 22, 2011, that's prepared by way of The Hong Kong Polytechnic collage, in collaboration with Southwest Jiaotong collage, Beijing Jiaotong collage, Dalian Jiaotong college, China Engineering specialists, Inc., Zhejiang college, and Tsinghua collage. carrying on with the good projects and momentums of the speedy improvement in high-speed and intercity railways around the world in recent times, IWHIR 2011 goals at delivering a platform for educational students and training engineers to proportion wisdom and adventure, to advertise collaboration, and to bolster R&D actions concerning railway engineering. Engineers, scientists, professors, and scholars from universities, examine institutes, and comparable business businesses were cordially invited to take part within the workshop. those papers have lined quite a lot of concerns bearing on high-speed and intercity railways within the theoretical, numerical, and experimental paintings relating high-speed and intercity railways. Showcasing variety and caliber, those papers file the state of the art and element to destiny instructions of analysis and improvement during this fascinating area.
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Example text
In this situation it is considered to be Ff ( xi ) = 0 . The Bing-ham viscoplastic model (Wereley et al. 1998) is employed to describe the damping force of the MR damper, that is FMR = f y sign ( xr ) + D3 xr + f0 (10) where f y is the Coulomb friction damping force which is controlled by a magnetic field, xr is the relative speed between the wheelset and the frame, D3 is the viscous damping coefficient of the MR damper, and f 0 is the offset force caused by a compensator which can be neglected.
Sky-hook control of nonlinear quarter car model traversing rough road matching performance of LQR control. : Non-linear optimal control of a semi-active vehicle suspension system. : Simulation analysis on semi-active control of suspension system for high-speed EMU with MR damper. : Control strategies for active steering of bogiebased railway vehicles. : Semi-Active suspension technologies and Models. In: Semi-Active Suspension Control Design for Vehicles, ch. 2, pp. : Idealized hysteresis modeling of electro rheological and magneto rheological dampers.
In general, a large Q or a small R means small structural responses and large control forces. By trial calculation we select weighting matrices Q = α × diag[ K1 , K1 , M f ] where α = 650 and R = β = 1. Then the tool function lqr ( ) in Matlab can be used to obtain the feedback gain matrix K . Thus the active optimal control force u* is designed according to corresponding speed V0 . 2 Semi-active Control Law － The Clipped LQR Control Law In order to make the damping force u (t ) of the MR damper to achieve the active optimal control force u* as much as possible in LQR control algorithm, the controllable damping force at time t is determined from the LQR control algorithm with the restriction that if the force is not dissipative, the MR dampers are commanded to perform as simple friction dampers.