摘要
为探索新型信号分析技术在建筑墙体夏季传热过程中热流信号处理时的应用,本文在对混凝土加腋锥式肋块型空心砌块墙体进行周期性非稳态传热数值计算的基础上,利用在时域具有高分辨率的希尔伯特黄变换算法(HHT)对墙体输入、输出热流进行经验模态分解(EMD)计算。结果表明:东、南、西、北朝向建筑墙体外表面输入热流的本征模态函数(IMF)中的第5、6(7)阶IMF已经基本奠定了信号函数的主导波形,各朝向热流波形有明显区别,第3、4阶IMF是对第5、6(7)阶信号的局部修正;各朝向建筑墙体内表面热流的IMF数量只有4~5阶,最后1~2阶与残差项之和就足以精确拟合原始信号;与傅里叶变换方法对比,EMD分解墙体热流谐波信号具有分解阶数较少、趋势项清晰、拟合精度高的优势。
To explore the application of new signal analysis technology in the heat transfer process of wall heat flux signal processing in summer,the periodic unsteady heat transfer numerical calculation of concrete hollow block wall with axillary conical brick was carried out.Hilbert-Huang transform algorithm(HHT)with high resolution in time domain was used to decompose the input and output heat flow of the wall by empirical mode decomposition(EMD).Results showed that order 5,6(7)of the intrinsic modal function(IMF)of heat flow input to the outer surface of the building wall from east,south,west and north basically laid the dominant waveforms of the signal function.The waveforms of heat flow in each direction were obviously different.3,4 order were the partial correction of the 5,6(7)order signal.The number of IMF of heat flow on the inner surface of building walls in all directions was only 4-5 order.The sum of the last 1-2 and the residual were sufficient to be accurate to the original signal.In contrast to the Fourier transform method,EMD decomposition of wall thermal harmonic signal always had the advantages of less decomposition order,clear change trend and high fitting accuracy.
作者
王晓璐
杨建林
王翠红
吴恩
徐雷
WANG Xiaolu;YANG Jianlin;WANG Cuihong;WU En;Xu Lei(School of Mechanical and Electrical Engineering, Jinling Institute of Technology, Nanjing 211169,China;College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2020年第5期656-662,共7页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省自然科学基金(BK2015-1099)。
