科学的试验设计方法能够显著提高学术研究和工业生产的质量和效率。以空气动力学试验设计为背景,介绍了现代试验设计方法的研究进展:总结了风洞试验中单因子试验设计方法 OFAT(One Fact at A Time)和现代试验设计方法MDOE(Modern Design...科学的试验设计方法能够显著提高学术研究和工业生产的质量和效率。以空气动力学试验设计为背景,介绍了现代试验设计方法的研究进展:总结了风洞试验中单因子试验设计方法 OFAT(One Fact at A Time)和现代试验设计方法MDOE(Modern Design Of Experiments)在试验目的、组织策略和试验结果 3个方面的区别,分析了现代试验设计方法的优势;从试验样本选取、模型建立和结果分析3个方面梳理了现代试验设计方法的现状,着重介绍了试验设计中的填充设计和序贯设计两大类试验样本选取方法;对所述试验设计方法进行了算例演示;讨论了当前存在的一些关键科学问题和未来研究方向。展开更多
In recent years,the safety and comfort of road vehicles driving on bridges under crosswinds have attracted more attention due to frequent occurrences of wind-induced disasters.This study focuses on a container truck a...In recent years,the safety and comfort of road vehicles driving on bridges under crosswinds have attracted more attention due to frequent occurrences of wind-induced disasters.This study focuses on a container truck and CRH2 high-speed train as research targets.Wind tunnel experiments are performed to investigate shielding effects of trains on aerodynamic characteristics of trucks.The results show that aerodynamic interference between trains and trucks varies with positions of trains(upstream,downstream)and trucks(upwind,downwind)and numbers of trains.To summarize,whether the train is upstream or downstream of tracks has basically no effect on aerodynamic forces,other than moments,of a truck driving on windward sides of bridges(upwind).In contrast,the presence of trains on the bridge deck has a significant impact on aerodynamic characteristics of a truck driving on leeward sides(downwind)at the same time.The best shielding effect on lateral forces of trucks occurs when the train is located downstream of tracks.Finally,the pressure measuring system shows that only lift forces on trains are affected by trucks,while other forces and moments are primarily affected by adjacent trains.展开更多
文摘科学的试验设计方法能够显著提高学术研究和工业生产的质量和效率。以空气动力学试验设计为背景,介绍了现代试验设计方法的研究进展:总结了风洞试验中单因子试验设计方法 OFAT(One Fact at A Time)和现代试验设计方法MDOE(Modern Design Of Experiments)在试验目的、组织策略和试验结果 3个方面的区别,分析了现代试验设计方法的优势;从试验样本选取、模型建立和结果分析3个方面梳理了现代试验设计方法的现状,着重介绍了试验设计中的填充设计和序贯设计两大类试验样本选取方法;对所述试验设计方法进行了算例演示;讨论了当前存在的一些关键科学问题和未来研究方向。
基金Projects(52078504,51822803,51925808,U1934209)supported by the National Natural Science Foundation of ChinaProject(KF2021-05)supported by the State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,China。
文摘In recent years,the safety and comfort of road vehicles driving on bridges under crosswinds have attracted more attention due to frequent occurrences of wind-induced disasters.This study focuses on a container truck and CRH2 high-speed train as research targets.Wind tunnel experiments are performed to investigate shielding effects of trains on aerodynamic characteristics of trucks.The results show that aerodynamic interference between trains and trucks varies with positions of trains(upstream,downstream)and trucks(upwind,downwind)and numbers of trains.To summarize,whether the train is upstream or downstream of tracks has basically no effect on aerodynamic forces,other than moments,of a truck driving on windward sides of bridges(upwind).In contrast,the presence of trains on the bridge deck has a significant impact on aerodynamic characteristics of a truck driving on leeward sides(downwind)at the same time.The best shielding effect on lateral forces of trucks occurs when the train is located downstream of tracks.Finally,the pressure measuring system shows that only lift forces on trains are affected by trucks,while other forces and moments are primarily affected by adjacent trains.
