摘要
轨道不平顺是影响常导磁悬浮系统车轨振动响应的重要因素,应用惯性基准法求解的轨道不平顺因包含动态不平顺成分,不能完全满足车-磁-轨耦合动力学的计算需求。结合高速磁悬浮的技术特点及线路标准提出了一种构建轨道不平顺的方法,基于惯性基准法计算实测垂向轨道不平顺;将各类符合实测数据分布特性的偏差作为随机变量叠加后获得轨道静态随机不平顺;求解沿梁长方向分布的轨道预拱值,并仿真分析有无预拱对车轨系统的具体影响;基于高速磁悬浮车-磁-轨耦合动力学仿真,对比分析600 km/h高速磁悬浮系统在两类轨道不平顺作用下的动力学响应。研究结果表明:轨道梁预拱能有效降低悬浮间隙波动;通过对比两种方法求取的轨道功率谱密度及其作用下的车轨系统动态响应,验证本文方法的准确性和有效性。本文提出的基于线路技术标准构建轨道不平顺的方法不依赖于试验数据,可为研究分析未来速度600 km/h级线路技术标准及其不平顺阈值提供参考。
Track irregularity is a critical factor affecting the vehicle-guideway dynamic response in electromagnetic suspension maglev system.However,the track irregularity obtained via the inertial reference method,which incorporates dynamic irregularity components,fails to fully meet the computational requirements for vehicle-magnetic force-guideway coupled dynamics.To address this issue,a methodology for constructing maglev track irregularity by integrating the technical characteristics and standards of high-speed maglev system was proposed.Firstly,the measured vertical track irregularity was calculated using the inertial reference method based on experimental data.Subsequently,deviations conforming to the distribution characteristics of the measured data were superimposed as random variables to generate static random track irregularity.Furthermore,the distribution of the pre-camber values of the track along the guideway was determined,and the specific impacts of the presence or absence of guideway pre-camber on the vehicle-guideway dynamic system were analyzed through numerical simulations.Finally,a vehicle-magnetic force-guideway coupled model was employed to compare the dynamic responses of a 600 km/h maglev system under two types of track irregularities.The results demonstrate that bridge beam pre-camber effectively mitigates fluctuations in levitation gaps.Comparative analyses of power spectral density and dynamic responses under different irregularity excitations validate the accuracy and effectiveness of the proposed method.The track irregularity construction method proposed in this study,based on line technical standards,which does not rely on experimental data,provides a reference for analyzing the technical standards and irregularity thresholds for future lines with a speed of 600 km/h.
作者
王文
徐俊起
陈琛
徐钊
李红梅
刘志刚
WANG Wen;XU Junqi;Chen Chen;XU Zhao;LI Hongmei;LIU Zhigang(State Key Laboratory of High-speed Maglev Transportation Technology,Tongji University,Shanghai 201804,China;College of Transportation,Tongji University,Shanghai 201804,China;National Maglev Transportation Engineering R&D Center,Tongji University,Shanghai 201804,China;Railway Science&Technology Research&Development Center,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道学报》
北大核心
2025年第7期214-224,共11页
Journal of the China Railway Society
基金
国家自然科学基金(52232013,52402452)
中国博士后科学基金(2024M752408)
中国国家铁路集团有限公司科技研究开发计划(K2024T005)。
关键词
高速磁悬浮列车
车轨耦合动力学
轨道不平顺
轨道预拱
T分布
high-speed maglev train
vehicle-track coupled dynamics
track irregularity
track pre-camber
t-distribution
