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1、page 1授课人柳贡民*动力与能源工程学院College of Power and Energy EngineeringFundamentals of Mechanical Fundamentals of Mechanical Vibration and NoiseVibration and NoisePro. Pro. 柳贡民柳贡民 办公地点办公地点: : 三甲三甲 动力装置工程技术研究所动力装置工程技术研究所Email: Email: Tel:82569458, 82569468, 15904609301Tel:82569458, 82569468, 15904609301page 2授
2、课人柳贡民*动力与能源工程学院College of Power and Energy Engineering教科书（Textbook）: 赵玫等，机械振动与噪声学， 科学出版社， 2004参考书（Reference Books）: 1. W.T. Thomson and M.D. Dahleh, Theory of Vibrations with Applications (5th ed.), Prentice Hall, 1997page 3授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering2. R.F. Barron, Indus
3、trial Noise Control and Acoustics, Marcel Dekker, 20033. 郑兆昌主编， 机械振动（上册），机械工业出版社，1980 4. 商大中，动力分析基础，哈尔滨工程大学出版社，1999 5. 季文美，机械振动，科学出版社， 1985page 4授课人柳贡民*动力与能源工程学院College of Power and Energy Engineeringpage 5授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control C
4、hapter 1 Introduction1.1.1 Summary of Mechanical VibrationUndesirable vibrations： Vehicle; Noise; Machines & Structures; Earthquake;Power units in every kinds of vessels may cause vibrationspage 6授课人柳贡民*动力与能源工程学院College of Power and Energy EngineeringUseful vibrations： String vibration; harmonic osc
5、illator, resonator; Vibrating road roller; Vibrating feeder; Vibrating forming machine. 1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.1 Summary of Mechanical Vibrationpage 7授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introd
6、uction1.1.2 Basic ConceptMechanical Vibration ?Research aim ?Vibration is a phenomena that a body or structure oscillates about some specified reference point. Vibration is commonly expressed in terms of frequency , amplitude and Phase angle.1. Elimination or suppression of undesirable vibrations 2.
7、 Generation of the necessary forms and quantities of useful vibrationspage 8授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.3 Model of Vibration System离散系统离散系统 （集中参数系统） Discrete system Discrete system (Lumped parameter system)(Lu
8、mped parameter system)连续系统连续系统 （分布参数系统） Continuous system Continuous system (Distributed parameter system)(Distributed parameter system)page 9授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.4 Clarification of Mechanical Vibration
9、s(1) (1) 按自由度分按自由度分(According to the degree of freedom)(According to the degree of freedom)The least number of mutually independent parameters (coordinates) required to uniquely define a material systems position in space, time, etc单自由度系统振动单自由度系统振动 (single degree of freedom)(single degree of freedom
10、) 多自由度系统振动 (multiple degree of freedom)连续系统连续系统振动 (continuous system)(continuous system)page 10授课人柳贡民*动力与能源工程学院College of Power and Energy EngineeringChapter 1 Introductionz单自由度系统振动单自由度系统振动 (single degree of freedom)(single degree of freedom) 多自由度系统振动 (multiple degree of freedom)ABABpage 11授课人柳贡民*动力
11、与能源工程学院College of Power and Energy EngineeringChapter 1 Introduction模型与自由度 (Model and degree of freedom)page 12授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.4 Clarification of Mechanical Vibrations(2) (2) 按激励形式分按激励形式分(According
12、 to the excitation)(According to the excitation)：自由振动自由振动 (free vibration)(free vibration) (no force) 强迫振动 (forced vibration) (external force)Free Free vibrationvibration the periodic motion occurring when an elastic system is displaced from its equilibrium position; Forced Forced vibrationvibration
13、 the vibration resulting from the application of an external force； page 13授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.4 Clarification of Mechanical Vibrations(3) (3) 按系统的响应分按系统的响应分(According to the system response)(According
14、 to the system response)：简谐振动简谐振动 (harmonic vibration)(harmonic vibration) ;周期振动 (periodic vibration)瞬态瞬态振动 (transient vibration); (transient vibration); 随机随机振动 (random vibration)(random vibration)Harmonic vibration Oscillations in which motion is periodic with time in the form of a sine curve. Peri
15、odic vibration An oscillatory motion whose amplitude pattern repeats after fixed increments of time. Transient vibration Temporarily sustained vibration of a mechanical system. It may consist of forced vibration. Random vibration A vibration whose instantaneous amplitude is not specified at any inst
16、ant of time. page 14授课人柳贡民*动力与能源工程学院College of Power and Energy Engineering1. 1 Mechanical Vibration and Control Chapter 1 Introduction1.1.4 Clarification of Mechanical Vibrations(4) (4) 按系统微分方程分按系统微分方程分(According to the (According to the Differential Equation ) )：线性振动线性振动 (linear vibration)(linear vibration) 非线性振动 (nonlinear vibration)Linear Vibration Linear differential equation ; (superposition) Nonlinear vibration Nonlinear differential equation Bifurcation & Chaospage 15授课人柳贡民*动力与能源工程学院Coll
