不同气流速度对竹笛边棱振动声学频率的影响  

Effect of Different Air Velocities on Frequency of Bamboo Flute Edges

作　　者：王艺达 郝骞 解彭博 苗媛媛[1] 刘镇波[1] 王巍 Wang Yida;Hao Qian;Xie Pengbo;Miao Yuanyuan;Liu Zhenbo;Wang Wei(Northeast Forestry University,Harbin 150040,P.R.China;Beijing Bamboo Orchestra)

机构地区：[1]东北林业大学,哈尔滨150040 [2]北京竹乐团

出　　处：《东北林业大学学报》2023年第8期113-120,126,共9页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31670559)。

摘　　要：为探究不同气流速度对竹笛边棱振动声学频率的影响情况,以筒音5——中音指法为基准,以4种气流速度(2.5、5.5、8.0、12.0 m·s^(-1))为变量,利用快速傅立叶变换(FFT)频谱分析法对竹笛边棱振动情况进行声学频率的测定。分析了4种气流速度下一阶频率、泛频、时域特征值(脉冲因子(I)、波形因子(W))、频域特征值(重心频率(F_(C)))、频谱特征值(功率谱熵(E(i)))的变化规律,并基于COMSOL平台验证了声场仿真在竹笛声学频率分析中的可行性。结果表明:随着气流速度的增大,各音阶对应的一阶频率(F(f_(2))~F(e_(3)))明显增大,泛频列也变得更加丰富;脉冲因子(I)、波形因子(W)、重心频率(F_(C))随着气流速度的增大而增大,功率谱熵(E(i))随着气流速度的增大而减小;低音阶(f_(2)~#a_(2))受气流速度影响较大、高音阶(c_(3)~e_(3))受气流速度影响较小;对比实验和仿真结果,结果表明:一阶频率(F(f_(2))~F(e_(3)))平均差异率为7.183%、振幅平均差异率为5.659%,证明了声学仿真在竹笛边棱振动的声学频率分析中的可行性。In order to explore the vibration response of bamboo flute edge under different airflow velocities,with the drum tone 5-middle tone fingering as the benchmark,and four airflow velocities(2.5,5.5,8.0 and 12.0 m·s^(-1))as variables,fast Fourier transform(FFT)spectrum analysis method was used to determine the acoustic frequency of the edge vibration of bamboo flute.The first order frequency,overtone sequence,time domain eigenvalues(pulse factor(I),waveform factor(W)),frequency domain eigenvalues(center of gravity frequency(F_(c))),and spectral eigenvalues(power spectral densityentropy(E(i)))of four airflow velocities were analyzed,and the feasibility of the simulation in acoustic vibration response analysis of bamboo flute was verified by COMSOL.With the increase of airflow velocity,the frequency(F(f_(2))-F(e_(3)))of the scale increases significantly,and the overtone sequence becomes more abundant.As the increase of airflow velocity,the impulse factor(I),waveform factor(W),and the center of gravity frequency(F_(c))grow,while the power spectrum entropy(E(i))decreases;the low scale(Altof_(2)-Alto#a_(2))is greatly affected by the airflow velocity,and the high scale(Altoc_(3)-Altoe_(3))is less affected by the airflow velocity.Comparison of experimental and simulation results found that frequency(Ff_(2)-Fe_(3)),and amplitude are 3.15%-9.31%and 3.14%-7.50%,respectively,which proves the feasibility of acoustic simulation in vibration response analysis of bamboo flute edge.

关 键 词：竹笛 边棱振动 气流速度 频响分析 声学仿真 

分 类 号：S781.2[农业科学—木材科学与技术]