Wave passage effects on the seismic response of a maglev vehicle moving on multi-span guideway

Abstract

As a seismic wave travels along the separate supports of an extended structure, the structure is subjected to multiple-support excitation due to seismic wave propagation. Considering the seismic wave passage effect, this paper describes seismic analysis of a maglev vehicle moving on a multiply supported gudieway. The guideway system is modeled as a series of simple beams and the vehicle as a four degrees-of-freedom (DOFs) rigid bar equipped with multiple onboard PI+LQR hybrid controllers. The controller is used to regulate control voltage for tuning both magnetic forces of uplift levitation and lateral guidance in the maglev system. Numerical studies show that as a maglev vehicle is equipped with more supported magnets then they can provide more control gains for tuning the guidance forces of the moving vehicle, and mitigate seismic-induced lateral vibration of a maglev vehicle running a guideway.

Experimental investigation on vibration characteristics of the medium–low-speed maglev vehicle–turnout coupled system

“…The problem of the dynamic interaction between vehicle and guideway has been extensively studied in rail transport dominated by wheel/rail system [10][11][12][13][14]. In the past decade or so, many scholars around the world have carried out a series of studies and made significant contributions to vehicle-guideway coupled vibration in normal conducting magnetic levitation: Yaghoubi and Ziari [15] discussed the design methods and criteria for guideway structure systematically; Han et al [16] investigated the effect of guideway vibration characteristics on the dynamic performance of the vehicle by means of numerical simulations and field tests; Kim et al [17] developed a detailed vehicle-guideway dynamics model to study its vibration characteristics when standing still and moving at low speeds; Lee et al [18] investigated the effects of parameters such as vehicle speed, irregularity, deflection/span ratio, bridge span and bridge damping ratio on the dynamics of medium-low-speed maglev vehicles and on flexible guideway bridges; Kwon et al [19], Wang et al [20] and Yau et al [21,22] explored the dynamic effects of gusty wind, ground settlement and earthquakes on vehicle and guideway; Han et al [23] analysed the characteristics of vehicleguideway dynamic interaction and proposed a limit value for the deflection/span ratio of the bridge; Chen et al [24] put forward a method to identify the linear and nonlinear stability of the levitation systems and plotted the stability domain of the system in the parameter space; Wang et al [25,26] also investigated the effect of guideway structure on the dynamics of the coupled system; Han et al [27] evaluated the levitation stability of the vehicle running on turnouts by numerical simulation. In terms of line testing, Li et al [28] and Li et al [29] conducted experimental studies on the dynamic performance between vehicle and concrete guideway on China's first commercial mediumlow-speed maglev line (Changsha Maglev Express) and a certain medium-low-speed test line, respectively.…”

Strand Tension Control in Anchor Span for Suspension Bridge Using Dynamic Balance Theory

“…The former is particularly important for the anchor span, and the latter is important for the middle and side spans. However, the structural linear position is decided by the force; thus, the former has a significant influence on the latter (Xu and Huang, 2002;Kreis and Andre, 2005;Yau, 2013;Wang et al, 2014). For the suspension bridge, the main cable consists of almost 100 strands, and the internal force of the main cable is equivalent to thousands of tons.…”