Acoustic analogies are applied mostly in numerical aeroacoustics to reduce aeroacoustic sound sources to simple emitter types. They are therefore often also referred to as aeroacoustic analogies. In general, aeroacoustic analogies are derived from the compressible Navier–Stokes equations (NSE). The compressible NSE are rearranged into various forms of the inhomogeneous acoustic wave equation. Within these equations, source terms describe the acoustic sources. They consist of pressure and speed fluctuation as well as stress tensor and force terms. Approximations are introduced to make the source terms independent of the acoustic variables. In this way, linearized equations are derived which describe the propagation of the acoustic waves in a homogeneous, resting medium. The latter is excited by the acoustic source terms, which are determined from the turbulent fluctuations. Since the aeroacoustics are described by the equations of classical acoustics, the methods are called aeroacoustic analogies. The Lighthill analogy considers a free flow, as for example with an engine jet. The nonstationary fluctuations of the stream are represented by a distribution of quadrupole sources in the same volume. The Curle analogy is a formal solution of the Lighthill analogy, which takes hard surfaces into consideration. The Ffowcs Williams–Hawkings analogy is valid for aeroacoustic sources in relative motion with respect to a hard surface, as is the case in many technical applications for example in the automotive industry or in air travel. The calculation involves quadrupole, dipole and monopole terms. (Wikipedia).

What is the connection between vectors and equations of planes? Find out here! Free ebook https://bookboon.com/en/introduction-to-vectors-ebook (updated link) Test your understanding via a short quiz http://goo.gl/forms/ZTQ0pvOq1q

From playlist Introduction to Vectors

Introduction to Parametric Equations

This video defines a parametric equations and shows how to graph a parametric equation by hand. http://mathispower4u.yolasite.com/

From playlist Parametric Equations

Intersection of Planes on Geogebra

In this video, we look at a strategy for finding the intersection of planes on Geogebra.

From playlist Geogebra

Subscribe to Stanford Engineering's The Future of Everything podcast: https://the-future-of-everything-stanford-engineering.simplecast.com/ A Stanford professor explains how fluid mechanics can help decrease the sound generated by airplanes. Since they were invented more than a century a

From playlist The Future of Everything

👉 Learn essential definitions of points, lines, and planes. A point defines a position in space. A line is a set of points. A line can be created by a minimum of two points. A plane is a flat surface made up of at least three points. A plane contains infinite number of lines. A ray is a li

From playlist Points Lines and Planes

👉 Learn essential definitions of points, lines, and planes. A point defines a position in space. A line is a set of points. A line can be created by a minimum of two points. A plane is a flat surface made up of at least three points. A plane contains infinite number of lines. A ray is a li

From playlist Points Lines and Planes

👉 Learn essential definitions of points, lines, and planes. A point defines a position in space. A line is a set of points. A line can be created by a minimum of two points. A plane is a flat surface made up of at least three points. A plane contains infinite number of lines. A ray is a li

From playlist Points Lines and Planes

Aerodynamics - How airplanes fly, maneuver, and land

Covers lift, stalls, angle of attack, wing flaps, and many other topics. My Patreon page is at https://www.patreon.com/EugeneK

From playlist Physics

Physical Science 2.4h - Airplane in the Wind

A non-mathematical look at adding two vectors that are not at right angles to each other.

From playlist Physical Science Chapter 2 (Complete chapter)

Ex: Determine the Point of Intersection of a Plane and a Line.

This video explains how to determine the intersection point of a plane and a line. http://mathispower4u.com

From playlist Equations of Planes and Lines in Space

Edexcel IGCSE Physics lesson on analog and digital signals

From playlist Edexecel IGCSE Physics

EEVblog #601 - Why Digital Oscilloscopes Appear Noisy

Why do digital oscilloscopes appear noisier than traditional analog oscilloscopes? Dave busts the myth that digital scopes are noiser than analog scopes, and demonstrates what inherent advantages digital scopes can have over analog scopes in terms of true waveform capture. And also why you

From playlist Oscilloscope Tutorials

EEVblog #1067 - Analog vs Digital Multimeters!

Are analog multimeters still of any practical value compared to digital? Only Dave can ponder that question for a half hour video... Forum: http://www.eevblog.com/forum/blog/eevblog-1067-analog-vs-digital-multimeters/ EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel

From playlist Multimeter Reviews

QTV #6 - Analog vs Digital Multimeters

View all my tutorials and videos: https://www.youtube.com/user/mjlorton/videos?live_view=500&flow=list&sort=dd&view=1 ------------------------------ Click "Show more" ------------------------------------------- In this video I take a look at some of the pros and cons between analog (analog

From playlist Quick Tech Videos - QTV!

Tutorial 04 for Arduino: Analog Inputs

New Episodes each Monday! You can download the parts list, code, and schematics from this episode on my website: http://jeremyblum.com/2011/01/24/arduino-tutorial-4-analog-inputs Watch my TechBits Episode on Analog and Digital Signals: http://www.youtube.com/watch?v=Z3rsO912e3I S

From playlist Tutorial Series for Arduino

A Defense of Classical Theology (Part 4): Metaphysics, Being, and the Analogy of Being

In part 4 of this series, we'll discuss what metaphysics is, the fundamental notion of "being" and whether it is a generic notion, how it is said of many things, the modes of predication, and the analogy of being, and its relation to natural theology. In this video series, I will make th

From playlist Theology

Lec 14 | MIT RES.6-008 Digital Signal Processing, 1975

Lecture 14: Design of IIR digital filters, part 1 Instructor: Alan V. Oppenheim View the complete course: http://ocw.mit.edu/RES6-008S11 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu

From playlist MIT RES.6-008 Digital Signal Processing, 1975

The Most Powerful Computers You've Never Heard Of

Analog computers were the most powerful computers for thousands of years, relegated to obscurity by the digital revolution. This video is sponsored by Brilliant. The first 200 people to sign up via https://brilliant.org/veritasium get 20% off a yearly subscription. Thanks to Scott Wiedema

From playlist Prob and Stats

Tutorial 08: analogRead() and the Serial Port: Arduino Course for Absolute Beginners (ReM)

***If you like this, I think you'll like the premium Arduino training we offer. Check it out here*** https://bit.ly/3nSBPUs We designed this circuit board for beginners! Kit-On-A-Shield: https://amzn.to/3lfWClU SHOP OUR FAVORITE STUFF! (affiliate links) ---------------------------------

From playlist Arduino Course (Programming Electronics Academy)

What is a point line and plane

From playlist Points Lines and Planes