 Last Modified : Fri, 14 Dec 18

## ECE473-F18

This week's schedule

### ECE 473 Schedule (Fall 2018)

 L W D Date Lecture and Assignment Part I: Oscillations and Wave Equation 1 35 M 8/27 Introduction pdfLecture: Ch-1a: Fundamentals of Vibration: Harmonic oscillator pdf Read: Kinsler et al., Ch. 1Homework: HW1; Matlab tutorial pdf 2 W 8/29 Lecture: Ch-1b: Damped Harmonic Oscillator 3 F 8/31 Lecture: Ch-1c: Inverse Laplace transform solution to the harmonic oscillatorHW1 due (2 weeks)Homework: HW2 - 36 M 9/3 Labor Day Holiday -- No class 4 W 9/5 Lecture: Ch-2a: The Vibrating String d'Alembert's solution to the wave equation pdf, wave equation solutionsRead: Kinsler et al., Ch. 2 5 F 9/7 Lecture: Ch-2b: Properties of the wave equation: speed of sound, wave number, input impedance, etc. Example problems: Standing waves, boundary conditions pptx 6 37 M 9/10 Lecture: Ch-2c: General considerations: Various coordinate systems pdf 7 W 9/12 Lecture: Ch-2d: Derivation of the Webster Horn equation: From the beginning 8 F 9/14 Lecture: Ch-5.1.1: The Acoustic Wave Equation and Simple Solutions: acoustic parameters, the equation of state. Example problem: Condensation in water and air.Read: Kinsler et al., Ch. 5 pdfHW2 dueHomework: HW3 9 38 M 9/17 Lecture: Ch-5.1.2: The equation of continuity, the Euler's equation, linearized wave equation. 10 W 9/19 Lecture: Ch-5.1.3: The velocity potential, speed of sound (SOS). Example problems: Sound pressure level (SPL), SOS in gases for isothermal and adiabatic processes. 11 F 9/21 Lecture: Ch-5.2.1: The Harmonic Plane Waves: the Helmholtz equation pdfBoundary conditions: Number of half or quarter wavelengthsHW3 dueHomework: HW4 12 39 M 9/24 Lecture: Ch-5.2.2: The 3D wave equation, the wave number. Energy Density: Kinetic and Potential Acoustic Energy. 13 W 9/26 Lecture: Ch-5.2.3: The acoustic intensity: Instantaneous and average intensity, ISPTA, etc. Example problem: estimating acoustic parameters in water. 14 F 9/28 Lecture: Ch-5.3.1: The acoustic impedance: characteristic and specific. Spherical waves: specific acoustic impedance pdfHW4 dueHomework: HW5 15 40 M 10/1 Lecture: Ch-5.3.2: Sound pressure level (SPL), Intensity level (IL), Acoustic Power: decibel scale, references in water and air. Example problems: Familiarizing with decibel scales for SPL and IL. Acoustic parameters in water and air for plane waves. 16 W 10/3 No office hours; Lecture: Discuss Exam;Exam I: 7-9:30 PM; 3013 ECEB]] - F 10/5 Lecture: cancelled due to exam; Part II: Nonlinear Acoustics and Acoustic Propagation 17 41 M 10/8 Lecture:Ch-6.1.1: Reflection and Transmission: Normal incidence, boundary conditions (BCs) pdf Example problem: Energy conservation.Read: Kinsler et al., Ch. 6 18 W 10/10 Lecture: Ch-6.1.2: Standing wave ratio (SWR). Example problems: Rigid and pressure release boundaries, reflection at interfaces within human body. 19 F 10/12 Lecture: Ch-5.4: Nonlinear Acoustics: parameter of nonlinearity (B/A), nonlinear wave equation, N-wave formation, shock wave formation, shock distance, Goldberg number. Example problem: estimating shock distance in water.Read: Kinsler et al., Ch. 16.1 - 16.3 pdfHW5 dueHomework: HW6 20 42 M 10/15 Lecture: Ch-6.2.1: Transmission through a layer: BCs, acoustic windows, matching layers pdf Example problem: Effect of walls pptx 21 W 10/17 Lecture:Ch-6.2.2: Oblique incidence: BCs, Snell's law pptx Example problem: critical angle, intromission angle. 22 F 10/19 Lecture: Ch-6.3.1: Reflection at a solid: Longitudinal and shear wave speeds pdf Example problem: critical angles for propagation into solids.HW6 dueHomework: HW7 23 43 M 10/22 Lecture: Ch-6.3.2: Thermoclines: Sound speed gradients. Example: Ocean thermoclines pptxRead: Kinsler et al., Ch. 15.4, Image model of room pdf 24 W 10/24 Lecture: Ch-7.1.1: Radiation and Reception of Acoustic Waves: Simple sources, superposition principle pdfRead: Kinsler et al., Ch. 7 Example problem: Intensity, power, strength of a small sources. 25 F 10/26 Lecture: Ch-7.1.2: The continuous line source: the far field approximation, the sinc function, the spatial Fourier transform. Example problem: Beam pattern in a continuous line source pptxTyped Paper on Sound outline dueHW7 dueHomework: HW8 26 44 M 10/29 Lecture: Ch-7.2.1: Radiation from a plane circular piston: The near field approximations, Rayleigh distance pdf Example: Near field axial pressure pptx 27 W 10/31 Lecture: Ch-7.2.2: The far field approximations, the jinc function. 28 F 11/2 Lecture: Ch-7.3.1: Beam patterns line source vs plane circular piston: Physical beam width. Radiation impedance pdf. Example problem: Radiation impedance in air and water for a circular piston.HW8 dueHomework: HW9 29 45 M 11/5 Lecture: Ch-7.3.2: Fundamental properties of transducers: Directional factor and beam pattern, directivity index (DI), etc. Example problem: Directivity for a circular piston. Part III: Linear Arrays, Acoustic Waveguides and Resonators 30 W 11/7 Lecture: Ch-7.4.1: The line array: the comb function, the far field approximation pdf. Example problem: Radiation impedance in air and water for a circular piston. 31 F 11/9 Lecture: Ch-7.4.2: The grating lobes in a line array: Steering an arraySupplemental lecture 1): Fourier transforms as scalar products. 32 46 M 11/12 Lecture: Ch-9.1: Cavities and Waveguides: The rectangular cavity pdfEigenmodes of waveguides and cavities.Supplemental lecture 2): Distinction between Fourier and Laplace Transforms.Read: Kinsler et al., Ch. 9.1 - 9.2, 9.5; Lecture notes(pdf) Lec 11b (p. 91), 12a (p. 103) 33 W 11/14 Lecture: Ch-9.2: Waveguide of constant cross section, phase speed, group speed. Review for ExamHW9 dueHomework: HW10 (pdf);Practice Exam II (pdf) Exam II: 7-9:30 PM; 2015 ECEB]] Several copies of the book will be provided at the exam. - F 11/16 No office hours; No class due to Exam II - 47 - - Thanksgiving Holiday (11/17-11/25) 34 48 M 11/26 Lecture: Ch-10.1.1: Pipes, Resonators, and Filters: Motivation, resonance of pipes, closed pipes pdfRead: Kinsler et al., Ch. 10 35 W 11/28 Lecture: Ch-10.1.2: Open-ended pipes, effective length of pipe, quality factor of a resonator.Example problems: Flanged and unflanged open-ended pipes. 36 F 11/30 Lecture: Ch-10.1.3: Standing wave patterns, absorption of sound in pipes.Example problem: Standing wave ratio.HW10 dueHomework: HW11 37 49 M 12/3 Lecture: Ch-10.2.1: Combined driver-pipe system, Helmholtz resonator: resonance frequency in resonators pdf 38 W 12/5 Lecture: Ch-10.2.2: Acoustic impedance: resistance, inertance, compliance.Example problems: Quality factor and resonance frequency in Helmholtz resonators. 39 F 12/7 Lecture: Ch-10.3: Reflection and transmission in pipes, Acoustic filters: types of filters pdf, 40 50 M 12/10 Lecture:Horns: Chapter 14a, Webster Horn equation: pdf 41 W 12/12 Lecture: Ch-14: Hearing: How the cochlea works: pdf Ch-8: Absorption and Attenuation of Sound: complex wave number, acoustic scattering pdfRead: Kinsler et al., Ch. 8.1 - 8.5Typed Paper on Sound Final paper dueHW11 due - R 12/13 Reading Day - 51 M 12/14 7:00-10:00 p.m., Friday, Dec. 14 3015 - - - - -

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