Acoustic emission characteristics of rock under impact loading
复合材料声衬声阻抗性能测试试验研究
Vol.60No.2工程与试验ENGINEERING&TEST Jun.2020复合材料声衬声阻抗性能测试试验研究黄太誉，高翔(中国飞机强度研究所第三十二研究室，陕西西安710065)摘要：声衬是降低发动机噪声的重要组件。
为探索复合材料在声衬上的应用，本文基于Helmholtz原理，采用树脂基复合材料，针对某特定工况设计制备了微穿孔板蜂窝夹层结构声衬，并开展了相应的试验研究。
研究结果表明，按照当前树脂基复合材料良好的加工性能和制备工艺，该声衬能够较好地满足结构参数和声学性能的设计要求。
关键词：树脂基复合材料;声衬;声阻抗中图分类号：V216.5+4文献标识码:A doi：10.3969/j.issn.1674-3407.2020.02.012Experimental Study on Acoustic Impedance of Composite Acoustic LinerHuang Taiyu,Gao Xiang(The32nd Research of China Aircraft Strength Research Institute,Xi an710065,Shaanxi,China)Abstract:Acoustic liner an important component to reduce engine noise.In order to explore the application of composite materials to the acoustic liner,based on the Helmholtz principle,the acoustic liner of micro perforated plate honeycomb sandwich structure is designed and prepared,and the corresponding test research is carried out.The results show that according to the good processing performance and preparation process of resin matrix composite,it can meet the design requirements of structural parameters and acoustic properties.Keywords:resin matrix composite；acoustic liner；acoustic impedance1引言喷气式发动机问世伊始，在噪声传递路径中铺设声衬一直是最主要的噪声控制手段口⑵。
Acoustic-Emission-TestingPPT课件
Acoustic Emission Testing
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1
Introduction to Acoustic Emission Testing
• 材料中因裂缝扩展、塑性变形或相变等引 起应变能快速释放而产生应力波的现象称 为声发射。
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2
声发射技术
•
通过接收和分析材料的声发射信号来
评定材料的性能或结构完整性。
• The first difference pertains to the origin of the signal. Instead of supplying energy to the object under examination, AET simply listens for the energy released by the object.
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Attenuation （衰减）
• geometric spreading. • material damping • wave scattering
Geometric discontinuities (e.g. twin boundaries, nonmetallic inclusions, or grain boundaries) and structural boundaries both reflect some of the wave energy that was initially transmitted
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6
Activity of AE Sources in Structural Loading
Basic AE history plot showing Kaiser effect (BCB), Felicity effect (DEF), and emission during hold (GH ) 2
acoustics的形容词
acoustics的形容词"Acoustics" 是声学的意思，指的是声音的产生、传播、控制和接收等方面的研究。
与"acoustics" 相关的形容词有：1.Acoustic（声学的）:描述与声音有关的事物，例如acousticwaves（声波）、acoustic properties（声学特性）等。
2.Acoustic（音响的）：与声音系统、音响设备或音响效果相关的，例如acoustic performance（音响性能）、acoustic environment（音响环境）等。
3.Acoustic（声音的）：与声音特性、音色等相关的，例如acousticquality（声音质量）、acoustic characteristics（声音特性）等。
例句：1.Acoustic waves propagate through the air.•声波通过空气传播。
2.The concert hall was designed with excellent acousticproperties.•这个音乐厅的设计考虑到了优秀的声学特性。
3.The acoustic performance of the speaker system wasoutstanding.•这个音响系统的声音表现非常出色。
4.Scientists study the acoustic characteristics of differentmaterials.•科学家研究不同材料的声音特性。
5.In an acoustic environment, background noise canaffect concentration.•在一个音响环境中，背景噪音可能会影响集中注意力。
6.The acoustic quality of the recording was crystal clear.•录音的声音质量非常清晰。
基于Virtual.Lab Acoustics的管道壁面声阻抗优化分析
Optimization and Analysis of Acoustic Impedance of Duct Wall Based on b Acoustics
Weiguang Zheng, Peng Xu, Zeyu Lin, Rongjiang Tang
School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin Guangxi
∫ [ N ] dΩ
其中 [ K ] 为声学刚度矩阵， [C ] 为声学阻尼矩阵， [ F ] 为声学激励。 在得到形函数的情况下，求解式(11)就可以得到节点处的声压。 为验证本文方法的准确性，采用文献[2]同样的模型。管道截面形状为正方形，边长取 0.066 m，管长 度取 1.2 m。管道内壁边存在两种边界条件，即刚性壁面条件与阻抗边界条件。在管道入口处施加单位速 度边界条件，出口施加无反射边界属性。管道壁面为刚性，声衬处采用法向阻抗边界条件。管道采用六 面体声学网格，网格大小为 6 mm，计算频率区间取 500 Hz 到 1500 Hz，网格单元数量为 2.42 万(图 2)。
法向阻抗边界条件 Ω z
(8)
p ∂p = − jρ0ω Zn ∂n
则
(9)
Ω = Ω r + Ωv + Ω z
(10)
和 p 具有相同的形函数，将式(4)与式(7)至式(10)代入式(6)中，经整理可得 假设 p
2 − jρ0ωun ∫ [ K ] + jρ0ω Z [C ] − k0 [C ] [ pi ] =
3.1. 声学仿真优化计算
模型的边界条件与优化参数的设置直接影响到声学仿真优化的准确性，本文采用 Tester [6]研究所得 的经验公式算出初始阻抗值，并在此基础上进行优化。以下表 1 与表 2 分别对应管内无流与有稳定切向 流两种情况下， 壁面最优声阻抗 Z (Z = Zo/ρ0c0， Zo 为最优阻抗值， ρ0c0 为空气特性阻抗， 本文取 416.5 kg/m2/s) 和传递损失，并将最优阻抗数值解与文献[5]的优化结果进行了对比(图 3)。
声学超结构在车内低频轰鸣声控制中的应用
2021年第4期【摘要】针对某款轿车在30km/h 匀速行驶过程中产生明显的低频轰鸣声问题，通过测试和分析，确定了车内35Hz 噪声峰值过高是引发该问题的直接原因，并判断出该频率峰值与尾门薄壁件振动密切相关。
基于局域共振原理，设计了具有轻量化、小型化特征的声学超结构，并完成了谐振单元构型的选择与带隙设计、整车布置规划及谐振单元排布与基体框架设计。
实车测试结果表明：贴附声学超结构后，前排和后排35Hz 车内噪声声压级分别降低了4.23dB(A)、5.77dB(A)。
主题词：声学超结构结构声控制局域共振车内低频轰鸣中图分类号：U461.1文献标识码：ADOI:10.19620/ki.1000-3703.20200952The Application of Acoustic Superstructure on Control of LowFrequency Roaring in VehicleTang Jiyou 1,Ding Weiping 1,Wu Yudong 1,Huang Haibo 1,Luo Deyang 2（1.Southwest Jiao Tong University,Chengdu 610031;2.SAIC GM Wuling Automobile Co.,Ltd.,Liuzhou 545000）【Abstract 】Obvious low-frequency roaring sound is produced by a car model during the constant speed of 30km/h.By testing and analysis,it is determined that the high peak of 35Hz noise inside the car is the direct cause of this problem,and it is judged that the peak frequency is closely related to the vibration of thin-wall parts of the tail door.Furthermore,based on the principle of local resonance,a lightweight and miniaturized acoustic superstructure is developed,which involves the selection of its resonant unit configuration,band-gap design,vehicle layout planning,resonant unitarrangement,matrix frame size design.The real vehicle test shows that after attaching the acoustic superstructure,the noise of 35Hz in the car is reduced by 4.23dB(A)and 5.77dB(A)respectively in the front and rear rows.Key words:Acoustic superstructure,Structural sound control,Local resonance,Low frequencyRoaring in vehicle唐吉有1丁渭平1吴昱东1黄海波1罗德洋2（1.西南交通大学，成都610031；2.上汽通用五菱汽车股份有限公司，柳州545000）*基金项目：国家自然科学基金项目（51775451）。
激光诱导击穿光谱技术及应用研究进展
第6卷 第4期2013年8月 中国光学 Chinese Optics Vol.6 No.4Aug.2013 收稿日期:2013⁃04⁃11;修订日期:2013⁃06⁃13 基金项目:国家自然科学基金面上项目(No.31270680,No.61076064);江苏省“六大高峰人才”资助项目(No.2011⁃XCL⁃018);江苏高校优势学科建设工程资助项目文章编号 1674⁃2915(2013)04⁃0490⁃11激光诱导击穿光谱技术及应用研究进展侯冠宇1,王 平1∗,佟存柱2(1.南京林业大学化学工程学院,江苏南京210037;2.中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林长春130033)摘要:激光诱导击穿光谱(LIBS)技术是一种基于原子发射光谱学的元素定性、定量检测手段。
本文介绍了LIBS 技术的原理、应用方式、检测元素种类及检测极限;综述了该项技术在固体、液体、气体组分检测方面的技术发展,以及在环境检测、食品安全、生物医药、材料、军事、太空领域的应用进展。
最后,提出了高功率、高稳定的激光光源和准确的定量分析方法是LIBS 技术目前所面临的问题和挑战。
关 键 词:激光诱导击穿光谱;激光产生等离子体;元素分析;检测限中图分类号:O433.54;O657.319 文献标识码:A doi:10.3788/CO.20130604.0490Progress in laser⁃induced breakdown spectroscopyand its applicationsHOU Guan⁃yu 1,WANG Ping 1∗,TONG Cun⁃zhu 2(1.College of Chemical Engineering ,Nanjing Forestry University ,Nanjing 210037,China ;2.State Key Laboratory of Luminescence and Applications ,Changchun Institute of Optics ,Fine Mechanics and Physics ,Chinese Academy of Sciences ,Changchun 130033,China )∗Corresponding author ,E⁃mail :wp_lh@ Abstract :Laser⁃induced Breakdown Spectroscopy(LIBS)based on atomic emission spectral technology is a kind of convenient and sensitive approach for the qualitative and quantitative detection of elements.In this pa⁃per,the mechanism,detecting element types,detection limit and the recent progress of LIBS technology are reviewed.The progress of LIBS technology in component testing for solid,liquid and gas samples is expoundedin detail.The applications of LIBS in the environment test,food security,biological and medicines,material sciences,military and space fields are also presented.Finally,the challenges and problems for the LIBS tech⁃nology in high power and stable laser sources and accurately quantitative analysis method are discussed.Key words :laser⁃induced breakdown spectroscopy;laser⁃induced plasmon,element analysis;detection limit1 引 言 激光诱导击穿光谱(Laser⁃Induced Breakdown Spectroscopy,简称LIBS)技术是利用激光照射被测物体表面产生等离子体[1⁃2],通过检测等离子体光谱而获取物质成分和浓度的分析技术。
专业英语词汇大全
英文专业词汇大全英文翻译常用词汇短语具有：have (has), possess, take on表示为：present (提供、给出), denote, is, express by, figure, show,提出、提议：propose、put forward, bring forward明显地、显然地：evidently, obviously, appearently, distinctly, drastically提高、增加：increase, improve, enhance, heighten, elevate (elevation)减少：decrease, reduce, lessen,减小：minish输入、代入：import（进口）, input, introduce, substitute（(数)代入，vt代替、取代）, substituteA by(with) B（依B代A）, substitute for出现、发生：happen(vi), appear(vi), occur(vi), generate, take place, arise, come forth因为、由于：as, because, for, since, because of , by reason of , on account of, due to根据、依照：in terms of, according to,计算、求解：compute, calculate, solve推导：derive, derivation, deduce, deducibility,由：by, from因此：so, thus, hence, therefore, thereby并且：also, and , besides而且：and that, furthermore, moreover,随着：along with, with, accompany一致，与……一致：coincident with, consistent with, in accord with推导：derive, deduce列举：enumerate, list专攻，致力于：specialize, apply oneself to完成，达到：achieve, accomplish, realize描述，描绘：represent,describe加强：intensify, enhance, reinforce, strengthen预见，预估：anticipate, estimate受到，承受：experience, endure, superimpose研究，探索：explore, exploration, investigate, investigation,相当的，比的上的：comparable, equivalent,做...实验, 对...做实验：make (carry out, do, perform, try) an experiment on (upon, in, with)固定，安装：mount, fixed, install, set影响：have(has) an impact on (upon)取决于：depend on, depend upon, have a dependence upon称为，把…称作，叫做：be termed以…为标题，称为：intitule vt求积分：Taking integration与…相反：contrary on , 与…对比：contrast with/to分别的respective，分别地apart respectivelyCompare vt. 比较，对照（with）把...比作；比喻（to）接着next, follow, in succession随后later subsequently whereafter总之anyhow anyway in a word in conclusion on all accounts to sum up 金属切削加工圆周铣削：peripheral milling,端铣削：end milling,（端）面铣（削）：face milling,顺铣：Down milling, climb milling逆铣：conventional milling, up milling,平面铣削：slab milling切屑横截面积：chip cross sectional area, area of chip section，单位切削力，比切削力：specific cutting pressure切向力：tangential cutting force径向力：radial cutting force声发射：acoustic emission signal与….联合、与…协作：in conjunction with振动方面的专业英语及词汇参见《工程振动名词术语》1 振动信号的时域、频域描述振动过程(Vibration Process)简谐振动(Harmonic Vibration)周期振动(Periodic Vibration)准周期振动(Ouasi-periodic Vibration)瞬态过程(Transient Process)随机振动过程(Random Vibration Process)各态历经过程(Ergodic Process)确定性过程(Deterministic Process)振幅(Amplitude)相位(Phase)初相位(Initial Phase)频率(Frequency)角频率(Angular Frequency)周期(Period)复数振动(Complex Vibration)复数振幅(Complex Amplitude)峰值(Peak-value)平均绝对值(Average Absolute Value)有效值(Effective Value，RMS Value)均值(Mean Value，Average Value)傅里叶级数(FS，Fourier Series)傅里叶变换(FT，Fourier Transform)傅里叶逆变换(IFT，Inverse Fourier Transform) 离散谱(Discrete Spectrum)连续谱(Continuous Spectrum)傅里叶谱(Fourier Spectrum)线性谱(Linear Spectrum)幅值谱(Amplitude Spectrum)相位谱(Phase Spectrum)均方值(Mean Square Value)方差(Variance)协方差(Covariance)自协方差函数(Auto-covariance Function)互协方差函数(Cross-covariance Function)自相关函数(Auto-correlation Function)互相关函数(Cross-correlation Function)标准偏差(Standard Deviation)相对标准偏差(Relative Standard Deviation)概率(Probability)概率分布(Probability Distribution)高斯概率分布(Gaussian Probability Distribution) 概率密度(Probability Density)集合平均(Ensemble Average)时间平均(Time Average)功率谱密度(PSD，Power Spectrum Density)自功率谱密度(Auto-spectral Density)互功率谱密度(Cross-spectral Density)均方根谱密度(RMS Spectral Density)能量谱密度(ESD，Energy Spectrum Density)相干函数(Coherence Function)帕斯瓦尔定理(Parseval''''s Theorem)维纳，辛钦公式(Wiener-Khinchin Formula)多阶谐振频率multi-mode resonance frequency多阶频率multiple natural frequnency等效一阶频率equvilent fundamental frequency主振频率main vibration frequency一阶弯曲振动频率First-order Bending Vibration Freguency 低阶固有频率LOW-V ALUE NATURAL FREQUENCY振型分解法Mode Analysis Method振型叠加法Method of Superposition of Vibration Mode2 振动系统的固有特性、激励与响应振动系统(Vibration System)激励(Excitation)响应(Response)单自由度系统(Single Degree-Of-Freedom System)多自由度系统(Multi-Degree-Of- Freedom System)离散化系统(Discrete System)连续体系统(Continuous System)刚度系数(Stiffness Coefficient)自由振动(Free Vibration)自由响应(Free Response)强迫振动(Forced Vibration)强迫响应(Forced Response)初始条件(Initial Condition)固有频率(Natural Frequency)阻尼比(Damping Ratio)衰减指数(Damping Exponent)阻尼固有频率(Damped Natural Frequency)对数减幅系数(Logarithmic Decrement)主频率(Principal Frequency)无阻尼模态频率(Undamped Modal Frequency)模态(Mode)主振动(Principal Vibration)振型(Mode Shape)振型矢量(Vector Of Mode Shape)模态矢量(Modal Vector)正交性(Orthogonality)展开定理(Expansion Theorem)主质量(Principal Mass)模态质量(Modal Mass)主刚度(Principal Stiffness)模态刚度(Modal Stiffness)正则化(Normalization)振型矩阵(Matrix Of Modal Shape)模态矩阵(Modal Matrix)主坐标(Principal Coordinates)模态坐标(Modal Coordinates)模态分析(Modal Analysis)模态阻尼比(Modal Damping Ratio)频响函数(Frequency Response Function)幅频特性(Amplitude-frequency Characteristics)相频特性(Phase frequency Characteristics)共振(Resonance)半功率点(Half power Points)波德图(Bodé Plot)动力放大系数(Dynamical Magnification Factor)单位脉冲(Unit Impulse)冲激响应函数(Impulse Response Function)杜哈美积分(Duhamel‟s Integral)卷积积分(Convolution Integral)卷积定理(Convolution Theorem)特征矩阵(Characteristic Matrix)阻抗矩阵(Impedance Matrix)频响函数矩阵(Matrix Of Frequency Response Function) 导纳矩阵(Mobility Matrix)冲击响应谱(Shock Response Spectrum)冲击激励(Shock Excitation)冲击响应(Shock Response)冲击初始响应谱(Initial Shock Response Spectrum)冲击剩余响应谱(Residual Shock Response Spectrum) 冲击最大响应谱(Maximum Shock Response Spectrum) 冲击响应谱分析(Shock Response Spectrum Analysis)3 模态试验分析模态试验(Modal Testing)机械阻抗(Mechanical Impedance)位移阻抗(Displacement Impedance)速度阻抗(Velocity Impedance)加速度阻抗(Acceleration Impedance)机械导纳(Mechanical Mobility)位移导纳(Displacement Mobility)速度导纳(Velocity Mobility)加速度导纳(Acceleration Mobility)驱动点导纳(Driving Point Mobility)跨点导纳(Cross Mobility)传递函数(Transfer Function)拉普拉斯变换(Laplace Transform)传递函数矩阵(Matrix Of Transfer Function)频响函数(FRF，Frequency Response Function)频响函数矩阵(Matrix Of FRF)实模态(Normal Mode)复模态(Complex Mode)模态参数(Modal Parameter)模态频率(Modal Frequency)模态阻尼比(Modal Damping Ratio)模态振型(Modal Shape)模态质量(Modal Mass)模态刚度(Modal Stiffness)模态阻力系数(Modal Damping Coefficient)模态阻抗(Modal Impedance)模态导纳(Modal Mobility)模态损耗因子(Modal Loss Factor)比例粘性阻尼(Proportional Viscous Damping)非比例粘性阻尼(Non-proportional Viscous Damping) 结构阻尼(Structural Damping，Hysteretic Damping) 复频率(Complex Frequency)复振型(Complex Modal Shape)留数(Residue)极点(Pole)零点(Zero)复留数(Complex Residue)随机激励(Random Excitation)伪随机激励(Pseudo Random Excitation)猝发随机激励(Burst Random Excitation)稳态正弦激励(Steady State Sine Excitation)正弦扫描激励(Sweeping Sine Excitation)锤击激励(Impact Excitation)频响函数的H1 估计(FRF Estimate by H1)频响函数的H2 估计(FRF Estimate by H2)频响函数的H3 估计(FRF Estimate by H3)单模态曲线拟合法(Single-mode Curve Fitting Method) 多模态曲线拟合法(Multi-mode Curve Fitting Method) 模态圆(Mode Circle)剩余模态(Residual Mode)幅频峰值法(Peak Value Method)实频-虚频峰值法(Peak Real／Imaginary Method)圆拟合法(Circle Fitting Method)加权最小二乘拟合法(Weighting Least Squares Fitting method) 复指数拟合法(Complex Exponential Fitting method)1.2 振动测试的名词术语1 传感器测量系统传感器测量系统(Transducer Measuring System)传感器(Transducer)振动传感器(Vibration Transducer)机械接收(Mechanical Reception)机电变换(Electro-mechanical Conversion)测量电路(Measuring Circuit)惯性式传感器(Inertial Transducer，Seismic Transducer)相对式传感器(Relative Transducer)电感式传感器(Inductive Transducer)应变式传感器(Strain Gauge Transducer)电动力传感器(Electro-dynamic Transducer)压电式传感器(Piezoelectric Transducer)压阻式传感器(Piezoresistive Transducer)电涡流式传感器(Eddy Current Transducer)伺服式传感器(Servo Transducer)灵敏度(Sensitivity)复数灵敏度(Complex Sensitivity)分辨率(Resolution)频率范围(Frequency Range)线性范围(Linear Range)频率上限(Upper Limit Frequency)频率下限(Lower Limit Frequency)静态响应(Static Response)零频率响应(Zero Frequency Response)动态范围(Dynamic Range)幅值上限Upper Limit Amplitude)幅值下限(Lower Limit Amplitude)最大可测振级(Max．Detectable Vibration Level)最小可测振级(Min．Detectable Vibration Level)信噪比(S/N Ratio)振动诺模图(Vibration Nomogram)相移(Phase Shift)波形畸变(Wave-shape Distortion)比例相移(Proportional Phase Shift)惯性传感器的稳态响应(Steady Response Of Inertial Transducer) 惯性传感器的稳击响应(Shock Response Of Inertial Transducer)位移计型的频响特性(Frequency Response Characteristics Vibrometer)加速度计型的频响特性(Frequency Response Characteristics Accelerometer) 幅频特性曲线(Amplitude-frequency Curve)相频特性曲线(Phase-frequency Curve)固定安装共振频率(Mounted Resonance Frequency)安装刚度(Mounted Stiffness)有限高频效应(Effect Of Limited High Frequency)有限低频效应(Effect Of Limited Low Frequency)电动式变换(Electro-dynamic Conversion)磁感应强度(Magnetic Induction，Magnetic Flux Density)磁通(Magnetic Flux)磁隙(Magnetic Gap)电磁力(Electro-magnetic Force)相对式速度传(Relative Velocity Transducer)惯性式速度传感器(Inertial Velocity Transducer)速度灵敏度(Velocity Sensitivity)电涡流阻尼(Eddy-current Damping)无源微(积)分电路(Passive Differential (Integrate) Circuit)有源微(积)分电路(Active Differential (Integrate) Circuit)运算放大器(Operational Amplifier)时间常数(Time Constant)比例运算(Scaling)积分运算(Integration)微分运算(Differentiation)高通滤波电路(High-pass Filter Circuit)低通滤波电路(Low-pass Filter Circuit)截止频率(Cut-off Frequency)压电效应(Piezoelectric Effect)压电陶瓷(Piezoelectric Ceramic)压电常数(Piezoelectric Constant)极化(Polarization)压电式加速度传感器(Piezoelectric Acceleration Transducer)中心压缩式(Center Compression Accelerometer)三角剪切式(Delta Shear Accelerometer)压电方程(Piezoelectric Equation)压电石英(Piezoelectric Quartz)电荷等效电路(Charge Equivalent Circuit)电压等效电路(Voltage Equivalent Circuit)电荷灵敏度(Charge Sensitivity)电压灵敏度(Voltage Sensitivity)电荷放大器(Charge Amplifier)适调放大环节(Conditional Amplifier Section)归一化(Uniformization)电荷放大器增益(Gain Of Charge Amplifier)测量系统灵敏度(Sensitivity Of Measuring System)底部应变灵敏度(Base Strain Sensitivity)横向灵敏度(Transverse Sensitivity)地回路(Ground Loop)力传感器(Force Transducer)力传感器灵敏度(Sensitivity Of Force Transducer)电涡流(Eddy Current)前置器(Proximitor)间隙-电压曲线(Voltage vs Gap Curve)间隙-电压灵敏度(Voltage vs Gap Sensitivity)压阻效应(Piezoresistive Effect)轴向压阻系数(Axial Piezoresistive Coefficient)横向压阻系数(Transverse Piezoresistive Coefficient)压阻常数(Piezoresistive Constant)单晶硅(Monocrystalline Silicon)应变灵敏度(Strain Sensitivity)固态压阻式加速度传感器(Solid State Piezoresistive Accelerometer) 体型压阻式加速度传感器(Bulk Type Piezoresistive Accelerometer) 力平衡式传感器(Force Balance Transducer)电动力常数(Electro-dynamic Constant)机电耦合系统(Electro-mechanical Coupling System)2 检测仪表、激励设备及校准装置时间基准信号(Time Base Signal)李萨茹图(Lissojous Curve)数字频率计(Digital Frequency Meter)便携式测振表(Portable Vibrometer)有效值电压表(RMS Value Voltmeter)峰值电压表(Peak-value Voltmeter)平均绝对值检波电路(Average Absolute Value Detector)峰值检波电路(Peak-value Detector)准有效值检波电路(Quasi RMS Value Detector)真有效值检波电路(True RMS Value Detector)直流数字电压表(DVM，DC Digital Voltmeter)数字式测振表(Digital Vibrometer)A/D 转换器(A/D Converter)D/A 转换器(D/A Converter)相位计(Phase Meter)电子记录仪(Lever Recorder)光线示波器(Oscillograph)振子(Galvonometer)磁带记录仪(Magnetic Tape Recorder)DR 方式(直接记录式) (Direct Recorder)FM 方式(频率调制式) (Frequency Modulation)失真度(Distortion)机械式激振器(Mechanical Exciter)机械式振动台(Mechanical Shaker)离心式激振器(Centrifugal Exciter)电动力式振动台(Electro-dynamic Shaker)电动力式激振器(Electro-dynamic Exciter)液压式振动台(Hydraulic Shaker)液压式激振器(Hydraulic Exciter)电液放大器(Electro-hydraulic Amplifier)磁吸式激振器(Magnetic Pulling Exciter)涡流式激振器(Eddy Current Exciter)压电激振片(Piezoelectric Exciting Elements)冲击力锤(Impact Hammer)冲击试验台(Shock Testing Machine)激振控制技术(Excitation Control Technique)波形再现(Wave Reproduction)压缩技术(Compression Technique)均衡技术(Equalization Technique)交越频率(Crossover Frequency)综合技术(Synthesis Technique)校准(Calibration)分部校准(Calibration for Components in system)系统校准(Calibration for Over-all System)模拟传感器(Simulated Transducer)静态校准(Static Calibration)简谐激励校准(Harmonic Excitation Calibration)绝对校准(Absolute Calibration)相对校准(Relative Calibration)比较校准(Comparison Calibration)标准振动台(Standard Vibration Exciter)读数显微镜法(Microscope-streak Method)光栅板法(Ronchi Ruling Method)光学干涉条纹计数法(Optical Interferometer Fringe Counting Method)光学干涉条纹消失法(Optical Interferometer Fringe Disappearance Method) 背靠背安装(Back-to-back Mounting)互易校准法(Reciprocity Calibration)共振梁(Resonant Bar)冲击校准(Impact Exciting Calibration)摆锤冲击校准(Ballistic Pendulum Calibration)落锤冲击校准(Drop Test Calibration)振动和冲击标准(Vibration and Shock Standard)迈克尔逊干涉仪(Michelson Interferometer)摩尔干涉图象(Moire Fringe)参考传感器(Reference Transducer)3 频率分析及数字信号处理带通滤波器(Band-pass Filter)半功率带宽(Half-power Bandwidth)3 dB 带宽(3 dB Bandwidth)等效噪声带宽(Effective Noise Bandwidth)恒带宽(Constant Bandwidth)恒百分比带宽(Constant Percentage Bandwidth)1/N 倍频程滤波器(1/N Octave Filter)形状因子(Shape Factor)截止频率(Cut-off Frequency)中心频率(Centre Frequency)模拟滤波器(Analog Filter)数字滤波器(Digital Filter)跟踪滤波器(Tracking Filter)外差式频率分析仪(Heterodyne Frequency Analyzer) 逐级式频率分析仪(Stepped Frequency Analyzer)扫描式频率分析仪(Sweeping Filter Analyzer)混频器(Mixer)RC 平均(RC Averaging)平均时间(Averaging Time)扫描速度(Sweeping Speed)滤波器响应时间(Filter Response Time)离散傅里叶变换(DFT，Discrete Fourier Transform) 快速傅里叶变换(FFT，Fast Fourier Transform)抽样频率(Sampling Frequency)抽样间隔(Sampling Interval)抽样定理(Sampling Theorem)抗混滤波(Anti-aliasing Filter)泄漏(Leakage)加窗(Windowing)窗函数(Window Function)截断(Truncation)频率混淆(Frequency Aliasing)乃奎斯特频率(Nyquist Frequency)矩形窗(Rectangular Window)汉宁窗(Hanning Window)凯塞-贝塞尔窗(Kaiser-Bessel Window)平顶窗(Flat-top Window)平均(Averaging)线性平均(Linear Averaging)指数平均(Exponential Averaging)峰值保持平均(Peak-hold Averaging)时域平均(Time-domain Averaging)谱平均(Spectrum Averaging)重叠平均(Overlap Averaging)栅栏效应(Picket Fence Effect)吉卜斯效应(Gibbs Effect)基带频谱分析(Base-band Spectral Analysis)选带频谱分析(Band Selectable Sp4ctralAnalysis)细化(Zoom)数字移频(Digital Frequency Shift)抽样率缩减(Sampling Rate Reduction)功率谱估计(Power Spectrum Estimate)相关函数估计(Correlation Estimate)频响函数估计(Frequency Response Function Estimate) 相干函数估计(Coherence Function Estimate)冲激响应函数估计(Impulse Response Function Estimate) 倒频谱(Cepstrum)功率倒频谱(Power Cepstrum)幅值倒频谱(Amplitude Cepstrum)倒频率(Quefrency)4 旋转机械的振动测试及状态监测状态监测(Condition Monitoring)故障诊断(Fault Diagnosis)转子(Rotor)转手支承系统(Rotor-Support System)振动故障(Vibration Fault)轴振动(Shaft Vibration)径向振动(Radial Vibration)基频振动(Fundamental Frequency Vibration)基频检测(Fundamental Frequency Component Detecting) 键相信号(Key-phase Signal)正峰相位(+Peak Phase)高点(High Spot)光电传感器(Optical Transducer)同相分量(In-phase Component)正交分量(Quadrature Component)跟踪滤波(Tracking Filter)波德图(Bode Plot)极坐标图(Polar Plot)临界转速(Critical Speed)不平衡响应(Unbalance Response)残余振幅(Residual Amplitude)方位角(Attitude Angle)轴心轨迹(Shaft Centerline Orbit)正进动(Forward Precession)同步正进动(Synchronous Forward Precession)反进动(Backward Precession)正向涡动(Forward Whirl)反向涡动(Backward Whirl)油膜涡动(Oil Whirl)油膜振荡(Oil Whip)轴心平均位置(Average Shaft Centerline Position) 复合探头(Dual Probe)振摆信号(Runout Signal)电学振摆(Electrical Runout)机械振摆(Mechanical Runout)慢滚动向量(Slow Roll Vector)振摆补偿(Runout Compensation)故障频率特征(Frequency Characteristics Of Fault) 重力临界(Gravity Critical)对中(Alignment)双刚度转子(Dual Stiffness Rotor)啮合频率(Gear-mesh Frequency)间入简谐分量(Interharmonic Component)边带振动(Side-band Vibration)三维频谱图(Three Dimensional Spectral Plot)瀑布图(Waterfall Plot)级联图(Cascade Plot)阶次跟踪(Order Tracking)阶次跟踪倍乘器(Order Tracking Multiplier)监测系统(Monitoring System)适调放大器(Conditional Amplifier)趋势分析(Trend Analysis)倒频谱分析(Cepstrum Analysis)直方图(Histogram)确认矩阵(Confirmation Matrix)通频幅值(Over-all Amplitude)幅值谱(Amplitude Spectrum)相位谱(Phase Spectrum)报警限(Alarm Level)机械相关专业词汇集锦阿基米德蜗杆 Archimedes worm 安全系数 safety factor; factor of safety安全载荷 safe load 凹面、凹度 concavity扳手 wrench 板簧 flat leaf spring半圆键 woodruff key 变形 deformation摆杆 oscillating bar 摆动从动件 oscillating follower摆动从动件凸轮机构 cam with oscillating follower 摆动导杆机构 oscillating guide-bar mechanism摆线齿轮 cycloidal gear 摆线齿形 cycloidal tooth profile摆线运动规律 cycloidal motion 摆线针轮 cycloidal-pin wheel包角 angle of contact 保持架 cage背对背安装 back-to-back arrangement 背锥 back cone ；normal cone背锥角 back angle 背锥距 back cone distance比例尺 scale 比热容 specific heat capacity闭式链 closed kinematic chain 闭链机构 closed chain mechanism臂部 arm 变频器 frequency converters变频调速 frequency control of motor speed 变速 speed change变速齿轮 change gear ; change wheel 变位齿轮 modified gear变位系数 modification coefficient 标准齿轮 standard gear标准直齿轮 standard spur gear 表面质量系数 superficial mass factor表面传热系数 surface coefficient of heat transfer 表面粗糙度 surface roughness并联式组合 combination in parallel 并联机构 parallel mechanism并联组合机构 parallel combined mechanism 并行工程 concurrent engineering并行设计 concurred design, CD 不平衡相位 phase angle of unbalance不平衡 imbalance (or unbalance) 不平衡量 amount of unbalance不完全齿轮机构 intermittent gearing 波发生器 wave generator波数 number of waves 补偿 compensation参数化设计 parameterization design, PD 残余应力 residual stress操纵及控制装置 operation control device 槽轮 Geneva wheel槽轮机构 Geneva mechanism ；Maltese cross 槽数 Geneva numerate槽凸轮 groove cam 侧隙 backlash差动轮系 differential gear train 差动螺旋机构 differential screw mechanism差速器 differential 常用机构 conventional mechanism; mechanism in common use车床 lathe 承载量系数 bearing capacity factor承载能力 bearing capacity 成对安装 paired mounting尺寸系列 dimension series 齿槽 tooth space齿槽宽 spacewidth 齿侧间隙 backlash齿顶高 addendum 齿顶圆 addendum circle齿根高 dedendum 齿根圆 dedendum circle齿厚 tooth thickness 齿距 circular pitch齿宽 face width 齿廓 tooth profile齿廓曲线 tooth curve 齿轮 gear齿轮变速箱 speed-changing gear boxes 齿轮齿条机构 pinion and rack齿轮插刀 pinion cutter; pinion-shaped shaper cutter 齿轮滚刀 hob ,hobbing cutter齿轮机构 gear 齿轮轮坯 blank齿轮传动系 pinion unit 齿轮联轴器 gear coupling齿条传动 rack gear 齿数 tooth number齿数比 gear ratio 齿条 rack齿条插刀 rack cutter; rack-shaped shaper cutter 齿形链、无声链 silent chain齿形系数 form factor 齿式棘轮机构 tooth ratchet mechanism插齿机 gear shaper 重合点 coincident points重合度 contact ratio 冲床 punch传动比 transmission ratio, speed ratio 传动装置 gearing; transmission gear 传动系统 driven system 传动角 transmission angle传动轴 transmission shaft 串联式组合 combination in series串联式组合机构 series combined mechanism 串级调速 cascade speed control创新 innovation ; creation 创新设计 creation design垂直载荷、法向载荷 normal load 唇形橡胶密封 lip rubber seal磁流体轴承 magnetic fluid bearing 从动带轮 driven pulley从动件 driven link, follower 从动件平底宽度 width of flat-face从动件停歇 follower dwell 从动件运动规律 follower motion从动轮 driven gear 粗线 bold line粗牙螺纹 coarse thread 大齿轮 gear wheel打包机 packer 打滑 slipping带传动 belt driving 带轮 belt pulley带式制动器 band brake 单列轴承 single row bearing单向推力轴承 single-direction thrust bearing 单万向联轴节 single universal joint 单位矢量 unit vector 当量齿轮 equivalent spur gear; virtual gear当量齿数 equivalent teeth number; virtual number of teeth当量摩擦系数 equivalent coefficient of friction当量载荷 equivalent load 刀具 cutter导数 derivative 倒角 chamfer导热性 conduction of heat 导程 lead导程角 lead angle 等加等减速运动规律 parabolic motion; constant acceleration and deceleration motion等速运动规律 uniform motion; constant velocity motion 等径凸轮 conjugate yoke radial cam等宽凸轮 constant-breadth cam 等效构件 equivalent link等效力 equivalent force 等效力矩 equivalent moment of force 等效量 equivalent 等效质量 equivalent mass等效转动惯量 equivalent moment of inertia 等效动力学模型 dynamically equivalent model底座 chassis 低副 lower pair点划线 chain dotted line （疲劳）点蚀 pitting垫圈 gasket 垫片密封 gasket seal碟形弹簧 belleville spring 动力学 dynamics顶隙 bottom clearance 定轴轮系 ordinary gear train; gear train with fixed axes动密封 kinematical seal 动能 dynamic energy动力粘度 dynamic viscosity 动力润滑 dynamic lubrication动平衡 dynamic balance 动平衡机 dynamic balancing machine 动态特性 dynamic characteristics 动态分析设计 dynamic analysis design 动压力 dynamic reaction 动载荷 dynamic load端面 transverse plane 端面参数 transverse parameters端面齿距 transverse circular pitch 端面齿廓 transverse tooth profile端面重合度 transverse contact ratio 端面模数 transverse module端面压力角 transverse pressure angle 锻造 forge对称循环应力 symmetry circulating stress 对心滚子从动件 radial (or in-line ) roller follower对心直动从动件 radial (or in-line ) translating follower对心移动从动件 radial reciprocating follower对心曲柄滑块机构 in-line slider-crank (or crank-slider) mechanism多列轴承 multi-row bearing 多楔带 poly V-belt 多项式运动规律 polynomial motion多质量转子 rotor with several masses 惰轮 idle gear额定寿命 rating life 额定载荷 load ratingII 级杆组 dyad 发生线 generating line发生面 generating plane 法面 normal plane法面参数 normal parameters 法面齿距 normal circular pitch法面模数 normal module 法面压力角 normal pressure angle法向齿距 normal pitch 法向齿廓 normal tooth profile法向直廓蜗杆 straight sided normal worm 法向力 normal force反馈式组合 feedback combining 反向运动学 inverse ( or backward) kinematics反转法 kinematic inversion 反正切 Arctan范成法 generating cutting 仿形法 form cutting方案设计、概念设计 concept design, CD 防振装置 shockproof device飞轮 flywheel 飞轮矩 moment of flywheel非标准齿轮 nonstandard gear 非接触式密封 non-contact seal非周期性速度波动 aperiodic speed fluctuation 非圆齿轮 non-circular gear粉末合金 powder metallurgy 分度线 reference line; standard pitch line分度圆 reference circle; standard (cutting) pitch circle分度圆柱导程角 lead angle at reference cylinder分度圆柱螺旋角 helix angle at reference cylinder 分母 denominator分子 numerator 分度圆锥 reference cone; standard pitch cone分析法 analytical method 封闭差动轮系 planetary differential复合铰链 compound hinge 复合式组合 compound combining复合轮系 compound (or combined) gear train 复合平带 compound flat belt复合应力 combined stress 复式螺旋机构 Compound screw mechanism 复杂机构 complex mechanism 杆组 Assur group干涉 interference 刚度系数 stiffness coefficient刚轮 rigid circular spline 钢丝软轴 wire soft shaft刚体导引机构 body guidance mechanism 刚性冲击 rigid impulse (shock)刚性转子 rigid rotor 刚性轴承 rigid bearing刚性联轴器 rigid coupling 高度系列 height series高速带 high speed belt 高副 higher pair格拉晓夫定理 Grashoff`s law 根切 undercutting公称直径 nominal diameter 高度系列 height series功 work 工况系数 application factor工艺设计 technological design 工作循环图 working cycle diagram工作机构 operation mechanism 工作载荷 external loads工作空间 working space 工作应力 working stress工作阻力 effective resistance 工作阻力矩 effective resistance moment公法线 common normal line 公共约束 general constraint公制齿轮 metric gears 功率 power功能分析设计 function analyses design 共轭齿廓 conjugate profiles共轭凸轮 conjugate cam 构件 link鼓风机 blower 固定构件 fixed link; frame固体润滑剂 solid lubricant 关节型操作器 jointed manipulator惯性力 inertia force 惯性力矩 moment of inertia ,shaking moment惯性力平衡 balance of shaking force 惯性力完全平衡 full balance of shaking force惯性力部分平衡 partial balance of shaking force 惯性主矩 resultant moment of inertia 惯性主失 resultant vector of inertia 冠轮 crown gear广义机构 generation mechanism 广义坐标 generalized coordinate轨迹生成 path generation 轨迹发生器 path generator滚刀 hob 滚道 raceway滚动体 rolling element 滚动轴承 rolling bearing滚动轴承代号 rolling bearing identification code 滚针 needle roller滚针轴承 needle roller bearing 滚子 roller滚子轴承 roller bearing 滚子半径 radius of roller滚子从动件 roller follower 滚子链 roller chain滚子链联轴器 double roller chain coupling 滚珠丝杆 ball screw滚柱式单向超越离合器 roller clutch 过度切割 undercutting函数发生器 function generator 函数生成 function generation含油轴承 oil bearing 耗油量 oil consumption耗油量系数 oil consumption factor 赫兹公式 H. Hertz equation合成弯矩 resultant bending moment 合力 resultant force合力矩 resultant moment of force 黑箱 black box横坐标 abscissa 互换性齿轮 interchangeable gears花键 spline 滑键、导键 feather key滑动轴承 sliding bearing 滑动率 sliding ratio滑块 slider 环面蜗杆 toroid helicoids worm环形弹簧 annular spring 缓冲装置 shocks; shock-absorber灰铸铁 grey cast iron 回程 return回转体平衡 balance of rotors 混合轮系 compound gear train积分 integrate 机电一体化系统设计 mechanical-electrical integration system design机构 mechanism 机构分析 analysis of mechanism机构平衡 balance of mechanism 机构学 mechanism机构运动设计 kinematic design of mechanism 机构运动简图 kinematic sketch of mechanism机构综合 synthesis of mechanism 机构组成 constitution of mechanism机架 frame, fixed link 机架变换 kinematic inversion机器 machine 机器人 robot机器人操作器 manipulator 机器人学 robotics技术过程 technique process 技术经济评价 technical and economic evaluation技术系统 technique system 机械 machinery机械创新设计 mechanical creation design, MCD 机械系统设计 mechanical system design, MSD机械动力分析 dynamic analysis of machinery 机械动力设计 dynamic design of machinery机械动力学 dynamics of machinery 机械的现代设计 modern machine design 机械系统 mechanical system 机械利益 mechanical advantage机械平衡 balance of machinery 机械手 manipulator机械设计 machine design; mechanical design 机械特性 mechanical behavior机械调速 mechanical speed governors 机械效率 mechanical efficiency机械原理 theory of machines and mechanisms 机械运转不均匀系数 coefficient of speed fluctuation机械无级变速 mechanical stepless speed changes 基础机构 fundamental mechanism基本额定寿命 basic rating life 基于实例设计 case-based design,CBD基圆 base circle 基圆半径 radius of base circle基圆齿距 base pitch 基圆压力角 pressure angle of base circle基圆柱 base cylinder 基圆锥 base cone急回机构 quick-return mechanism 急回特性 quick-return characteristics急回系数 advance-to return-time ratio 急回运动 quick-return motion棘轮 ratchet 棘轮机构 ratchet mechanism棘爪 pawl 极限位置 extreme (or limiting) position极位夹角 crank angle between extreme (or limiting) positions计算机辅助设计 computer aided design, CAD计算机辅助制造 computer aided manufacturing, CAM计算机集成制造系统 computer integrated manufacturing system, CIMS计算力矩 factored moment; calculation moment 计算弯矩 calculated bending moment加权系数 weighting efficient 加速度 acceleration加速度分析 acceleration analysis 加速度曲线 acceleration diagram尖点 pointing; cusp 尖底从动件 knife-edge follower间隙 backlash 间歇运动机构 intermittent motion mechanism减速比 reduction ratio 减速齿轮、减速装置 reduction gear减速器 speed reducer 减摩性 anti-friction quality渐开螺旋面 involute helicoids 渐开线 involute渐开线齿廓 involute profile 渐开线齿轮 involute gear渐开线发生线 generating line of involute 渐开线方程 involute equation渐开线函数 involute function 渐开线蜗杆 involute worm渐开线压力角 pressure angle of involute 渐开线花键 involute spline简谐运动 simple harmonic motion 键 key键槽 keyway 交变应力 repeated stress交变载荷 repeated fluctuating load 交叉带传动 cross-belt drive交错轴斜齿轮 crossed helical gears 胶合 scoring角加速度 angular acceleration 角速度 angular velocity角速比 angular velocity ratio 角接触球轴承 angular contact ball bearing 角接触推力轴承 angular contact thrust bearing 角接触向心轴承 angular contact radial bearing角接触轴承 angular contact bearing 铰链、枢纽 hinge校正平面 correcting plane 接触应力 contact stress接触式密封 contact seal 阶梯轴 multi-diameter shaft结构 structure 结构设计 structural design截面 section 节点 pitch point节距 circular pitch; pitch of teeth 节线 pitch line节圆 pitch circle 节圆齿厚 thickness on pitch circle节圆直径 pitch diameter 节圆锥 pitch cone节圆锥角 pitch cone angle 解析设计 analytical design紧边 tight-side 紧固件 fastener径节 diametral pitch 径向 radial direction径向当量动载荷 dynamic equivalent radial load 径向当量静载荷 static equivalent radial load 径向基本额定动载荷 basic dynamic radial load rating径向基本额定静载荷 basic static radial load tating径向接触轴承 radial contact bearing 径向平面 radial plane径向游隙 radial internal clearance 径向载荷 radial load径向载荷系数 radial load factor 径向间隙 clearance静力 static force 静平衡 static balance静载荷 static load 静密封 static seal局部自由度 passive degree of freedom 矩形螺纹 square threaded form锯齿形螺纹 buttress thread form 矩形牙嵌式离合器 square-jaw positive-contact clutch绝对尺寸系数 absolute dimensional factor 绝对运动 absolute motion绝对速度 absolute velocity 均衡装置 load balancing mechanism抗压强度 compression strength 开口传动 open-belt drive开式链 open kinematic chain 开链机构 open chain mechanism可靠度 degree of reliability 可靠性 reliability可靠性设计 reliability design, RD 空气弹簧 air spring空间机构 spatial mechanism 空间连杆机构 spatial linkage空间凸轮机构 spatial cam 空间运动副 spatial kinematic pair空间运动链 spatial kinematic chain 框图 block diagram空转 idle 宽度系列 width series雷诺方程Reynolds…s equation 离心力 centrifugal force离心应力 centrifugal stress 理论廓线 pitch curve离合器 clutch 离心密封 centrifugal seal理论啮合线 theoretical line of action 隶属度 membership 力 force力多边形 force polygon 力封闭型凸轮机构 force-drive (or force-closed) cam mechanism力矩 moment 力平衡 equilibrium力偶 couple 力偶矩 moment of couple连杆 connecting rod, coupler 连杆机构 linkage连杆曲线 coupler-curve 连心线 line of centers链 chain 链传动装置 chain gearing链轮 sprocket ; sprocket-wheel ; sprocket gear ; chain wheel 联组V 带 tight-up V belt联轴器 coupling ; shaft coupling 两维凸轮 two-dimensional cam临界转速 critical speed 六杆机构 six-bar linkage龙门刨床 double Haas planer 轮坯 blank轮系 gear train 螺杆 screw螺距 thread pitch 螺母 screw nut螺旋锥齿轮 helical bevel gear 螺钉 screws螺栓 bolts 螺纹导程 lead螺纹效率 screw efficiency 螺旋传动 power screw螺旋密封 spiral seal 螺纹 thread (of a screw)。
2D-CSiC陶瓷基复合材料拉伸试验的声发射特性
试验研究Nirn DOI：10. 11973/wsjc2021010122I>C/SiC陶瓷基复合材料拉伸试验的声发射特性黄豆，吴锦武,汪佳辉(南昌航空大学飞行器工程学院，南昌330063)摘要：对2I>C7SiC'陶瓷基复合材料试样在室温条件下单调拉伸试验和循环拉伸试验的损 伤声发射信号进行研究，利用无监督层次聚类分析方法对单调和循环拉伸试验的声发射信号进行 损伤模式识别，得出了两种拉伸试验下试样都有相同的损伤分类。
对每次单调加/卸栽试验分别进 行应力和声发射信号分析，得到了在循环加栽区间和卸栽区间试样的损伤情况。
对比分析两种拉 伸试验的声发射信号，得到两次试验中首次加栽相同应力时，两个试样有同一种类的声发射损伤信 号，从而说明循环加栽对试样的主要损伤影响较小。
关键词：陶瓷基复合材料;拉伸试验；声发射技术；层次聚类分析中图分类号：TB332;TG115.28 文献标志码：A文章编号：1000-6656(2021)01-0047-06 Acoustic emission characteristics of 2D-C/SiC ceramic matrix composites under tensile testHUANG I)ou. WU Jinwu. WANG Jiahui(School of Aircraft Engineering, Nanchang Hangkong University, Nanchang 330063, China) Abstract ： Acoustic Emission (AE) signals of 2D-C /SiC ceramic matrix composites under monotonic temsile test and cyclic tensile test at room temperature were studied. The unsupervised hierarchical clustering method was used to identify the damage pattern of AE signals in monotonic and cyclic tensile tests. The stress and acoustic emission signals of each monotonic loading/unloading test were analyzed respectively，and the damage conditions of the samples in the cyclic loading interval and the unloading interval were obtained. By comparing and analyzing the AE signals of the two tensile tests, it is found that when the same stress is first loaded in two tests, the two samples have the same type of AE damage signals, which indicates that the repeated loading has little impact on the main damage of the samples.Key words：ceramic matrix composite；tensile test；acoustic emission technique；hierarchical cluster analysis连续纤维增靭2I>C/SiC陶瓷基复合材料具有 高比强度、高比模量、抗腐蚀、抗氧化和耐高温等特 点，在航空、航天及民用领域应用广泛[12]。