脉动压力风洞试验采样参数确定方法及应用  

A Method and Its Application to Determine the Sampling Parameters of Fluctuating Pressure Wind Tunnel Test

作　　者：张玉杰[1,2] 黄超广 孙仁俊 ZHANG Yujie;HUANG Chaoguang;SUN Renjun(School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;AVIC The First Aircraft Institute,Xi'an 710089,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]航空工业第一飞机设计研究院,西安710089

出　　处：《装备环境工程》2024年第9期87-92,共6页Equipment Environmental Engineering

摘　　要：综合考虑脉动压力风洞试验中的时间延迟效应,以及结构振动响应分析时截止频率相关要求,推导出采样频率的计算公式。依据统计学理论,推导特定置信度和准确度下的采样时间的计算公式,并计及结构振动响应计算中对频率分辨率的要求,建立采样时间的确定方法。从输入参数、计算过程和结果出发,建立了信号采样参数的确定流程。以飞机典型结构脉动压力风洞试验为例,对该方法进行了说明,分析了相似换算后结构原型的脉动压力功率谱密度,结果满足振动响应计算需求,表明所提采样参数确定方法可行有效。该方法理论依据明确,对脉动压力风洞试验设计具有指导意义。The work aims to deduce the formulae to calculate the sampling frequency by considering the time delay effect in the fluctuating pressure wind tunnel test and the cut-off frequency in the structural vibration response analysis.Based on the sta-tistics theory,the formula used to predict the sampling time under the specific confidence level and accuracy degree was de-duced and the requirement of frequency resolution in structural vibration response calculation was taken into account to estab-lish the determination method of sampling time.Based on the input parameters,calculation process and results,the determina-tion process of signal sampling parameters was established.With the fluctuating pressure wind tunnel test of typical aircraft structure as an example,this method was illustrated,and the power spectral density of fluctuating pressure of the prototype structure after similar conversion was analyzed.The results met the requirements of vibration response calculation,which showed that the proposed sampling parameter determination method was feasible and effective.The theoretical basis of this method is clear and it has guiding significance for the design of fluctuating pressure wind tunnel tests.

关 键 词：脉动压力 风洞试验 采样频率 采样时间 相似比 振动响应 

分 类 号：TJ011[兵器科学与技术—兵器发射理论与技术]