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风与车流联合作用下在役桥行车舒适性研究 被引量:3
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作者 殷新锋 丰锦铭 +1 位作者 杨小旺 刘扬 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2016年第1期45-52,共8页
现有基于风-汽车-桥梁耦合振动的行车舒适性研究中,较少考虑了车流随机性和路面等级退化因素,致使分析成果具有一定局限性.本文综合考虑了车流随机性和路面等级退化等因素,运用一种新的车辆和路面等级退化模型分析大跨度桥梁的振动及行... 现有基于风-汽车-桥梁耦合振动的行车舒适性研究中,较少考虑了车流随机性和路面等级退化因素,致使分析成果具有一定局限性.本文综合考虑了车流随机性和路面等级退化等因素,运用一种新的车辆和路面等级退化模型分析大跨度桥梁的振动及行车舒适性.建立一个包含座椅及车辆纵向振动的24自由度空间车辆模型;基于考虑邻近车辆影响的改进CA(Cellular Automation-元胞自动基)模型和路面退化模型,通过桥梁和车辆相互作用力关系,建立了风-车流-桥梁系统的耦合振动方程.数值计算表明:本文所提出的方法能够合理地模拟风-车流-桥梁系统的耦合振动,且驾驶员座椅模型的各向振动对行车舒适性有显著影响. 展开更多
关键词 风-车流-桥梁耦合振动 三维车辆模型 路面退化 行车舒适性
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Study on Expressway Road-area Ecosystem
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作者 Z.B. Qin Z.H. Liu Y.Z. Li 《Journal of Environmental Science and Engineering》 2010年第3期64-69,共6页
Ecological restoration and reconstruction refers to how to prevent the main factors and processes from further degrading the ecosystem, as well as how to regulate and optimize the exchanging process and the space-time... Ecological restoration and reconstruction refers to how to prevent the main factors and processes from further degrading the ecosystem, as well as how to regulate and optimize the exchanging process and the space-time cycling system of substance, energy and information through man force, in order to restore the structure, function and eco-potentiality back to the original level or even higher, with the help of certain biological, ecological and engineering techniques. Ecological restoration and reconstruction involves problems of different levels and different fields, with the focus on the ecosystem (species communities), the landscape and certain areas. Problems in the process of road-area ecosystem construction are as follows: attention is paid to the conditions of the road itself and the short-term effects, not to the natural propagation of species within the whole road-area or the ecological safety area; the importance of biological diversity in ecological restoration is neglected; the property of heterogeneity necessary for a sound ecosystem is ignored; the ecological interaction among species doesn't earn enough attention; properties like localization and adaptability in different districts are not paid enough attention. Landscape ecology can guide the work of road-area ecosystem restoration, through the space pattern. 展开更多
关键词 Expressway road ecological restoration ecological reconstruction.
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