CAJ | 학술논문

针对风洞试验中通过天平测量列车气动力存在的缺陷，尝试通过测压积分获得列车气动力以提高脉动气动力测试精度，并对来流均匀的侧风作用下的 CRH2列车非定常空气动力特性进行分析。研究结果表明，当列车表面风压测点数量适当时，测压积分可获得与天平测力精度相当的定常气动力；即使是在均匀来流作用下，列车受到的气动力也表现出明显的非定常特性，极大气动力约为均值的1．7倍；0～10 Hz 低频段最大谱值发生在90°风向角，最小谱值则发生在0°风向角，10 Hz 以上高频段谱值分布情况则恰好相反，当风向角小于60°时，0～10 Hz 低频段能量占总能量的比重小于50％。
침대풍동시험중통과천평측량열차기동력존재적결함，상시통과측압적분획득열차기동력이제고맥동기동력측시정도，병대래류균균적측풍작용하적 CRH2열차비정상공기동력특성진행분석。연구결과표명，당열차표면풍압측점수량괄당시，측압적분가획득여천평측력정도상당적정상기동력；즉사시재균균래류작용하，열차수도적기동력야표현출명현적비정상특성，겁대기동력약위균치적1．7배；0～10 Hz 저빈단최대보치발생재90°풍향각，최소보치칙발생재0°풍향각，10 Hz 이상고빈단보치분포정황칙흡호상반，당풍향각소우60°시，0～10 Hz 저빈단능량점총능량적비중소우50％。
Due to the shortcomings in the aerodynamic forces measurements with a dynamometer for high speed train,a new methodology based on pressure measurements has been developed in order to improve the testing ac-curacy of fluctuating aerodynamic forces.The unsteady aerodynamic characteristics of CRH2 train under uniform cross wind were analyzed.The test results indicate that when the pressure taps distribution is appropriate and dense enough,pressure complementary calculations can also give the density of steady aerodynamic forces as ac-curately as the force test.In addition,the aerodynamic forces on the train have strong unsteady characteristics e-ven under uniform cross wind,and extreme aerodynamic forces are about 1.7 times of their mean values.The maximum spectral value in the low frequency range between 0 and 10 Hz occurs at 90°yaw angle,and the mini-mum value is found at 0°yaw angle.While the spectral value distributions in the high frequency greater than 10 Hz are just contrary.When the yaw angle is less than 60°,the proportion of low frequency energy in total is less than 50%.