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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 Engineering Fundamentals of Mechanical Fundamentals of Mechanical Vibration and NoiseVibration and Noise Pro. 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: liugongmin Tel:82569458, 82569468, 15904609301Tel:82569458, 82569468, 1
2、5904609301 page 2 授课人柳贡民* 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, 1997 page 3 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engin
3、eering 2. R.F. Barron, Industrial Noise Control and Acoustics, Marcel Dekker, 2003 3. 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， 1985 page 4 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.
4、1 Summary of Mechanical Vibration Vibrating Phenomena in the World Vibration are found in many branches of science and engineering page 5 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.1 Summary of Mechanical Vibration Undes
5、irable vibrations： Vehicle; Noise; Machines Earthquake; Power units in every kinds of vessels may cause vibrations page 6 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering Useful vibrations： String vibration; harmonic oscillator, resonator; Vibrating road roller; Vibrating feeder; Vibrating
6、forming machine. 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.1 Summary of Mechanical Vibration page 7 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.2 Basic Concept Mechanical Vibration ? Research aim ?
7、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. Generation of the necessary forms and quantities of useful
8、vibrations page 8 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.3 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)(Lumped parameter system) 连续系统连续系统 （分布参数系统） Continuous s
9、ystem 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 Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.4 Clarification of Mechanical Vibrations (1) (1) 按自由度分按自由度分(According to the degree o
10、f 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) 多自由度系统振动 (multiple degree of freedom) 连续系
11、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 Engineering Chapter 1 Introduction z 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) ABAB page 11 授课人柳贡民* 动力与能源工程学院 College of Power and En
12、ergy Engineering Chapter 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 Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.4 Clarification of Mechanical Vibrations (2) (2) 按激励形式分按激励形式分(According to the excitation)(A
13、ccording 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 the vibration resu
14、lting 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 Engineering 1. 1 Mechanical Vibration and Control Chapter 1 Introduction 1.1.4 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 to the syste
15、m 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. Periodic vibra
16、tion 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 instant of time. page 14 授课人柳贡民* 动力与能源工程学院 College of Power and Energy Engineering 1. 1 Mechanical Vibration and Control Chapter 1
