摘要
测压试验中,测压管的存在会导致风压信号产生畸变,影响后续数据分析的精度。通过实际测定测压管路频响函数,获得测压管对信号的影响规律,并揭示了“B-T理论”的不足。在实际紊流作用下研究测压管长度对单测点压力数据和模型整体力的影响,并验证“B-T理论”的修正效果。结果表明:对于单测点压力数据,测压管将不会影响数据均值和变异系数,标准差随管长增加先增后减,信号时域随管长增加而整体向均值靠近,相位则不断滞后,信号频域值随管长和频率的增加逐渐偏离真实值;对于整体力,整体阻力、各力的相关性、相干性均可认为不受测压管影响,力谱的变化规律与单测点频域值相同;“B-T理论”在信号时域上修正效果较差,在频域修正方面表现良好。
In the pressure test,the presence of the piezometric tube will distort the pressure signal and affect the accuracy of the subsequent data analysis.Through the actual measurement of the frequency response function of the measuring system,the influence law of the piezometric tube on the signal is obtained,and the shortcomings of the“B-T theory”are revealed.Based on this,under the actual turbulent flow,the influence of the piezometric tube length on the pressure data of a single measuring point and the total force of the model is studied,and the correction effect of the“B-T theory”is verified.The results show that for single-point pressure data,the piezometric tube will not affect the data mean and variation coefficient,the standard deviation increases first and then decreases as the tube length increases,the signal time domain approaches the mean value as the tube length increases,the phase keeps lagging,and the signal frequency domain value gradually deviates from the true value with the increase of the tube length and frequency.For the overall force of the model,the overall resistance,the correlation and coherence of each force can be regarded as not affected by the piezometric tube,the change rule of the force spectrum is the same as that of the frequency domain value of single measuring point.“B-T theory”has a poor correction effect in the signal time domain,and performs well in the frequency domain correction.
作者
张亮亮
陈傲
李少鹏
李智扬
ZHANG Liangliang;CHEN Ao;LI Shaopeng;LI Zhiyang(School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China;Chongqing College of Architecture and Technology,Chongqing 401331,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2024年第3期124-133,共10页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51978108)
“111项目”(B18062)
重庆市教委科学技术研究项目(KJZD-K201905201)。
关键词
测压试验
测压管
频响函数
信号修正
紊流
pressure measurement experiment
piezometric tube
frequency response function
signal correction
turbulence
