Influence of track irregularities in high-speed Maglev transportation systems

Huang, Jing Yu,Wu, Zhe Wei,Shi, Jin,Gao, Yang,Wang, Dong-Zhou Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.5

Track irregularities of high-speed Maglev lines have significant influence on ride comfort. Their adjustment is of key importance in the daily maintenance of these lines. In this study, an adjustment method is proposed and track irregularities analysis is performed. This study considers two modules: an inspection module and a vehicle-guideway coupling vibration analysis module. In the inspection module, an inertial reference method is employed for field-measurements of the Shanghai high-speed Maglev demonstration line. Then, a partial filtering, integration method, resampling method, and designed elliptic filter are employed to analyze the detection data, which reveals the required track irregularities. In the analysis module, a vehicle-guideway interaction model and an electromagnetic interaction model were developed. The influence of the measured line irregularities is considered for the calculations of the electromagnetic force. Numerical integration method was employed for the calculations. Based on the actual field detection results and analysis using the numerical model, a threshold analysis method is developed. Several irregularities modalities with different girder end's deviations were considered in the simulations. The inspection results indicated that long-wavelength irregularities with larger girder end's deviations were the dominant irregularities. In addition, the threshold analysis of the girder end's deviation shows that irregularities that have a deviation amplitude larger than 6 mm and certain modalities (e.g., M- and N-shape) are unfavorable. These types of irregularities should be adjusted during the daily maintenance.

궤도 불규칙도를 반영한 자기부상열차의 곡선주행 해석

한종부(Jongboo Han),김기정(Kijung Kim),김창현(Changhyun Kim),한형석(Hyungsuk Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5

EMS-type urban Maglev vehicles should maintain the levitation within an allowable range of air gap in order to run without touching the guideway. Generally, irregularities in a guideway are generated by manufacture and construction tolerance, as well as by thermal deformation. Though such irregularities of a guideway might influence the curving negotiation and ride quality of Maglev vehicles, there has been a lack of research considering the irregularities of guideway curve. Therefore, an analysis of the dynamic behavior of Maglev vehicles running over a curved guideway that consider irregularities is needed. The goal of this study is to propose a dynamic model considering the irregularities of a curved guideway, and to predict curving negotiation. Since the proposed model is based on 3-dimensional multibody dynamics, it enables more realistic simulation.

초전도 전자석 기자력 및 가이드웨이 불규칙도에 따른 캡슐트레인 대차의 동특성 고찰

이진호(Jin-Ho Lee),임정열(Jungyoul Lim),유원희(Won-Hee You),이관섭(Kwansup Lee) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.11

본 논문은 초전도 유도 반발식 부상 방식을 사용하는 캡슐트레인 대차의 동특성에 대해서 다룬다. 캡슐트레인 대차의 동특성은 대차에 부착되는 초전도 전자석과 튜브 가이드웨이에 설치되는 전자레일의 설계 사양 및 운영조건에 영향을 받는다. 본 연구에서는 캡슐트레인 대차의 기본 성능시험을 위하여 설계된 초전도 전자석과 전자레일을 대상으로 초전도 유도 반발식 부상을 고려하여 대차 1차 현가 시스템의 특성인 부상 강성 및 안내 강성을 도출하고 이를 바탕으로 대차의 동특성 해석모델을 구축하였다. 그리고 구축된 모델을 이용한 시뮬레이션을 통해 주요 운영조건인 초전도 전자석 기자력 및 가이드웨이 불규칙도에 따른 대차의 동특성을 분석하였다. 분석 결과, 대차의 동특성 향상을 위해서는 적절한 기자력으로 초전도 전자석을 운영하고, 가이드웨이 불규칙도를 낮게 관리하는 것이 필요함을 확인하였다. 또한, 대차에 부착되는 초전도 전자석 사이의 기자력 불균형 및 전자레일이 설치되는 좌우 가이드웨이 불규칙도 불균형은 대차의 전반적인 동특성을 저하시키며, 특히 롤 방향의 대차 동특성을 크게 악화시킴을 확인하였다. This paper deals with the dynamic characteristics of a capsule train bogie that utilizes a superconducting electrodynamic suspension (SC-EDS) levitation. The dynamic characteristics of the capsule train bogie are affected by the design specifications and the operating conditions of the superconducting magnet mounted on the bogie and the electric rail on the tube guideway. In this study, to obtain the designs for the superconducting magnet and the electric rail for basic performance, the levitation and guidance stiffness in the bogie primary suspension system were derived by considering the SC-EDS levitation method. Based on this derivation, a dynamic characteristic analysis model was constructed. Through the simulation that used the constructed model, the dynamic characteristics of the bogie were investigated according to the major operation conditions such as the superconducting magnet"s electromagnetic force and the guideway irregularity. The investigation results showed that proper adjustment of the electromagnetic force and a smaller guideway irregularity lead to improved dynamic characteristics of the bogie. It was also found that the imbalance of the electromagnetic force and the guideway irregularity both made the bogie"s dynamic characteristics worse, especially the dynamics of the roll direction.

자기부상열차-가이드웨이 통합 시스템의 동적 특성

공은호(Kong, Eun-Ho),강부병(Kang, Bu-Byoung),나성수(Na, Sung-Soo) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.2

This study is proposed to develop a numerical interaction model of the magnetically levitated(maglev) train and guideway. For this purpose, equation of motion for 6-DOF vehicle model, EMS, guideway and guideway irregularity are derived as the state-space equation. In order to solve the state space equations, the present work was performed via matlab simulation using Runge-Kutta method. Through the simulation, the effect of dynamic response of maglev system to different vehicle speeds, guideway rigidity(EI) and masses is investigated.

초고속자기부상철도의 부상시스템을 이용한 실시간 궤도상태 검측에 관한 연구

조정민(Jeong-Min Jo),한영재(Young-Jae Han),이진호(Jin-Ho Lee),이창영(Chang-Young Lee),김이현(Yi-Hyeon Kim) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10

본 논문에서는 상전도흡인식 자기부상열차의 부상시스템에서 사용되는 공극신호와 가속도신호를 통하여 가이드웨이의 불규칙성을 측정하는 방법을 제시하였다. 부상시스템에서의 공극센서와 가속도센서로부터 측정된 데이터로부터 절대 공극과 상대공극값으로 변환시킬 수 있다. 이러한 변환된 값은 가이드웨이의 불규칙성을 측정하는데 이용된다. 시뮬레이션결과는 제시한 방법이 합리적임을 보여준다. This paper gives a description of the methods and principles of measuring the guideway irregularity through use air-gap and acceleration signal in levitation system of electromagnetic suspension type Maglev. The data obtained from the measurement devices such as a gap sensor and an acceleration sensor in levitation system are transformed into absolute gap and relative gap. These data are used for measuring the guideway irregularity. In this paper simulation results show that the proposed method is reasonable.

Dynamic interaction analysis of actively controlled maglev vehicles and guideway girders considering nonlinear electromagnetic forces

Min, Dong-Ju,Lee, Jun-Seok,Kim, Moon-Young Techno-Press 2012 Coupled systems mechanics Vol.1 No.1

This study intends to explore dynamic interaction behaviors between actively controlled maglev vehicle and guideway girders by considering the nonlinear forms of electromagnetic force and current exactly. For this, governing equations for the maglev vehicle with ten degrees of freedom are derived by considering the nonlinear equation of electromagnetic force, surface irregularity, and the deflection of the guideway girder. Next, equations of motion of the guideway girder, based on the mode superposition method, are obtained by applying the UTM-01 control algorithm for electromagnetic suspension to make the maglev vehicle system stable. Finally, the numerical studies under various conditions are carried out to investigate the dynamic characteristics of the maglev system based on consideration of the linear and nonlinear electromagnetic forces. From numerical simulation, it is observed that the dynamic responses between nonlinear and linear analysis make little difference in the stable region. But unstable responses in nonlinear analysis under poor conditions can sometimes be obtained because the nominal air-gap is too small to control the maglev vehicle stably. However, it is demonstrated that this unstable phenomenon can be removed by making the nominal air-gap related to electromagnetic force larger. Consequently it is judged that the nonlinear analysis method considering the nonlinear equations of electromagnetic force and current can provide more realistic solutions than the linear analysis.

궤도선형을 고려한 자기부상열차 3 자유도 모델의 실험적 검증

박현철(H. C. Park),노명규(M. Noh),박영우(Y.W. Park),남성규(S. K. Nam),송치완(C.W. Song),강흥식(H. S. Kang) 한국정밀공학회 2016 한국정밀공학회 학술발표대회 논문집 Vol.2016 No.5월

고무차륜형식 경량전철 노면요철 측정시스템 개발

홍재성(J. S. Hong),이안호(A. H. Lee),류상환(S. H. Ryu),이은규(E. K. Lee) 한국정밀공학회 2009 한국정밀공학회 학술발표대회 논문집 Vol.2009 No.6월