摘要
针对风洞试验模型会产生受迫振动,测力天平测量的数据是模型受迫振动和受到气动力的混叠影响测力数据精度的问题,提出基于小波重构的天平动态特性数据处理技术。通过在模型上安装加速度计敲击模型获取受迫振动数据,再对受迫振动数据通过快速傅里叶变换(FFT)分析确定滤波频率阈值,采用小波重构技术实现滤波。通过投影公式计算动态补偿系数,通过补偿系数对天平测量的气动力实现补偿。试验数据分析发现,基于小波重构的天平动态特性数据处理技术,可得到固定的补偿系数,在试验环境中,干扰信号最大能衰减到15.69%,具有重要的工程应用价值。
Forced vibration occurs in wind tunnel experiments,thus,the data measured by balance is the aliasing of forced vibration and the aerodynamic force of a model.This affects the accuracy of force data.To address this problem,data processing technology of balanced dynamic characteristics is proposed based on wavelet reconstruction.Acceleration sensors are installed on the model,with vibration data obtained by knocking model,and natural frequency analyzed by fast Fourier transform(FFT).The filtering threshold is determined,and then the wavelet reconstruction is used for filtering.Finally,the dynamic compensation coefficient is calculated by projection equation.The aerodynamic data measured by the balances compensated by the compensation coefficient.Through the analysis of the experimental data,model forced vibration interference data can be processed by balance dynamic characteristics based on wavelet reconstruction.This study shows important application potential of the proposed technology in engineering.
作者
张峻宾
许晓斌
王雄
蒋万秋
舒海峰
孙鹏
ZHANG Junbin;XU Xiaobin;WANG Xiong;JIANG Wanqiu;SHU Haifeng;SUN Peng(Hypervelocity Aerodynamics Institute,China Aerodynamics Research&Development Center,Mianyang 621000,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2023年第6期1362-1371,共10页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金(61601495)
技术基础项目(KT-JSJC-2021-028)。
关键词
小波重构
天平
动态特性
数据处理
补偿系数
wavelet reconstruction
balance
dynamic compensation
data processing
compensation coefficient
