Part Four Oscillation and Waves 第四篇振动和波动
第 四 篇 振动和波动 Part Four Oscillation and Waves
Chapter 14 Mechanical Oscillation 第14章机械振动 Chapter 15 Mechanical Wave 第15章机械波 Chapter 16 Electromagnetic Oscillation & Wave 第16章电躐振酋和电躐波 Chapter 17 Wave Optics 第17章波动光学
第16章电磁振荡和电磁波 Chapter 16 Electromagnetic Oscillation &Wave Chapter 17 Wave Optics 第17章 波动光学 第14章 机械振动 第15章 机械波 Chapter 14 Mechanical Oscillation Chapter 15 Mechanical Wave
Chapter 14 Simple Harmonic Motion 第14章简谐振动 e
第14章 简谐振动 Chapter 14 Simple Harmonic Motion
8 14-1 Simple Harmonic Motion( SHM) 简谐振动 814-2 Amplitude Period Frequency &Phase 简谐振动的振幅,周期,頻率和位相 814-3 The Energy of SHM 简谐振动的能量 814-4 Damped Vibration& Forced Vibration Resonance阻尼振动受迫振动共振 8 14-5 Superposition of two SHM with same Frequency in same Direction 同方向同頻率的简谐振动的合成 814-6 Superposition of two Perpendicular SHM 相互垂直的简诸振动的合成
§14-4 Damped Vibration& Forced Vibration Resonance 阻尼振动 受迫振动 共振 §14-5 Superposition of two SHM with same Frequency in same Direction 同方向同頻率的简谐振动的合成 §14-6 Superposition of two Perpendicular SHM 相互垂直的简谐振动的合成 §14-3 The Energy of SHM 简谐振动的能量 §14-2 Amplitude Period Frequency & Phase 简谐振动的振幅, 周期,頻率和位相 §14-1 Simple Harmonic Motion (SHM) 简谐振动
教学要求 1、确切理解描述谐振动的特征量的物理意义,并能熟练 地确定振动系统的特征量,从而建立谐振动方程; 2、掌握描述谐振动的旋转矢量法和图线表示法; 3、掌握谐振动的特征和规律; 4、了解阻尼振动、强迫振动和共振的发生条件和规律; 5、掌握同方向、同频率谐振动的合成的特点和规律,了
教学要求 1、确切理解描述谐振动的特征量的物理意义,并能熟练 地确定振动系统的特征量,从而建立谐振动方程; 2、掌握描述谐振动的旋转矢量法和图线表示法; 3、掌握谐振动的特征和规律; 4、了解阻尼振动、强迫振动和共振的发生条件和规律; 5、掌握同方向、同频率谐振动的合成的特点和规律,了 解互相垂直谐振动的合成的特点
Introduction An infinite number of Varying force: F(tI ways in which a force may vary. particularly Periodic motion Vibration: a restoring force
Introduction Varying force: F(t) An infinite number of ways in which a force may vary. Periodic motion Vibration: a restoring force particularly
振动 仓 四季的变化 共振现象
四季的变化 共振现象 振动
In this chapter, we will study the most important periodic motion- Simple harmonic motion(简谐 振动), which is base to investigate(研究)the complex periodic motion. 复杂运动 平衡位置 周期运动 简谐振动——波动、电磁波、电压电流等
In this chapter, we will study the most important periodic motion-------Simple Harmonic Motion(简谐 振 动 ), which is base to investigate( 研 究 ) the complex periodic motion. 简谐振动 周期运动 复杂运动 波动、电磁波、电压电流等等
8 14-1 Simple Harmonic Motion 简谐振动 1. The simple harmonic motion (abbreviate: SHM) The system( black- spring in Fig. 15-1 is h m: x called as a simple harmonic oscillator(谐 振子): 平衡位置 Spring:k不计质量。 Fig.15-1 body: m Equilibrium position: point o(和外力等于零); 物体:在平衡位置附近作周期性往复运动; 坐标原点:通常取为平衡位置o;
§14-1 Simple Harmonic Motion 简谐振动 1. The simple harmonic motion(abbreviate:SHM) The system ( blackspring) in Fig.15-1 is called as a simple harmonic oscillator( 谐 振子): k m x Fig.15 −1 Spring: 不计质量。 body: k m Equilibrium position: point o(和外力等于零); 物体:在平衡位置附近作周期性往复运动; 坐标原点:通常取为平衡位置o;
Spring: deformation x; km氵y氵 Body displacement x; 平衡位置 force: F=-kx(frictionless); Fig.15-1 acceleration F 2 =-=-0x→ =-0x =k dt 2 which solution is x=:A cos(at or: x =: Asin(at+ 9=9 2 This equation is called the harmonic equation
Spring: deformation x; Body: displacement x; force: (frictionless); acceleration: F = −kxx m F a = = − which solution is = + = + = + x Acos(t ) or x Asin(t ) This equation is called the harmonic equation. k m x Fig.15 −1 x dt d x a = = − m k =