This document discusses various aspects of room acoustics, including how sound travels and interacts with surfaces. Sound can bounce off surfaces, be absorbed, diffracted, or interfere with itself. The properties of the room, including surface smoothness and materials, impact the behavior of sound. Absorptive materials can reduce reverberation time by transforming sound energy into heat. Diffraction causes sound to bend around objects. Experiments are described to understand reflection and diffraction. Different room designs, like amphitheaters and concert halls, influence the listener experience through focused or diffuse reflections.
Notes for Architecture 4th Year subject Services. The topic is about Acoustic, how does it work for different places, how we can treat spaces according to acoustic and for better acoustic
Notes for Architecture 4th Year subject Services. The topic is about Acoustic, how does it work for different places, how we can treat spaces according to acoustic and for better acoustic
WHAT IS ACOUSTICS? what is sound? AMPLITUDE AND VOLUME, FREQUENCY AND PITCH
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY, TIMBRE
VELOCITY OF SOUND
AMPLITUDE
REFLECTION
The behavior of sound in enclosed spaces is an important matter particularly in homes. It explains how the sound we listen gets colored causing distortion.
Explains basics about sound and what classroom issues are present due to sound effects which causes problem for students to hear teacher properly.
Explains concept of reverberation and other issues and suggests about its solution for better classroom sound efficiency
“a science that deals with the production, control, transmission, reception, and effects of sound.”
it is the science of controlling sound within buildings.
Slides used in a May 11, 2010 presentation at the monthly meeting of the Illinois Chapter ASHRAE by David G. Paoli, P.E., senior engineer, Shiner + Associates, Inc.
WHAT IS ACOUSTICS? what is sound? AMPLITUDE AND VOLUME, FREQUENCY AND PITCH
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY, TIMBRE
VELOCITY OF SOUND
AMPLITUDE
REFLECTION
The behavior of sound in enclosed spaces is an important matter particularly in homes. It explains how the sound we listen gets colored causing distortion.
Explains basics about sound and what classroom issues are present due to sound effects which causes problem for students to hear teacher properly.
Explains concept of reverberation and other issues and suggests about its solution for better classroom sound efficiency
“a science that deals with the production, control, transmission, reception, and effects of sound.”
it is the science of controlling sound within buildings.
Slides used in a May 11, 2010 presentation at the monthly meeting of the Illinois Chapter ASHRAE by David G. Paoli, P.E., senior engineer, Shiner + Associates, Inc.
Basic acoustics-SPL and Sound power, Reflection Refraction, Diffusion, diffraction, absorption, standing waves. Reverberation, RT, Room modes-Axial, Tangential oblique modes. Necessity of Reverberation, control and monitoring rooms, concert halls and theatres, inverse square law, Absorption coefficients of Materials. Sabine Equation, Growth and Decay of sound in an Enclosure. Acoustical features and design of Auditoriums and Theaters. Delay, Echo, Filters, Effects. Reverberant Fields .Binaural hearing, stereo/ Mono
Gable –The triangular end of a pitched roof, or the triangular upper part of the gable wall.
Hip – The edge of a hipped roof that runs from the ridge to the eaves. It is formed when two sloping surfaces intersect.
Eaves – This is the lower edge of the roof surface that overhangs the walls.
Soffit – This is the underside of the eaves that is fi xed to the back of the fascia and the wall. It forms an enclosed element all around the building.
Ridge – This is the uppermost line of the roof and is formed at the intersection of two sloping surfaces.
Valley – This is the line formed at the internal intersection of two sloping surfaces. It runs from the ridge to the eaves.
Verge – This is the underside surface of the eaves and the soffi t of a gable roof which overhangs the gable wall.
A roof must be prepped before applying your roofing materials.
Step one: Nail on Drip cap. This cap us used to prevent water from getting in behind the metal fascia and contacting the wood
roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather.
Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous.
In most countries a roof protects primarily against rain. Depending upon the nature of the building, the roof may also protect against heat, against sunlight, against cold and against wind.
A cement and sand screed finish to a concrete floor may be an acceptable, low cost finish to small area floors of garages, stores and outhouses where the small area does not justify the use of a power float and considerations of ease of cleaning are not of prime importance.
pioneers in acoustics
Greek philosopher and mathematician. Sought to explain the nature of all things in mathematical terms. His
greatest scientific studies were of sound: “He found that the strings of musical instruments delivered sound of
higher pitch as they were made shorter.” He discovered the relationship of pitch with string length and
recognised “if one string was twice the length of another, the sound it emitted was just an octave lower.”
47. Asimov, entry 5.
Name Zaha Mohammad Hadid
Born 31 October 1950, Baghdad, Iraq
Died 31 March 2016 (aged 65), Miami, Florida, US
Nationality British, Iraqi
Practice -- Zaha Hadid Architects
Louis i kahn
Born February 20, 1901 on Saaremmaa Island in Kuressaare.
Kahn's Jewish parents immigrated to the United States in 1906.
His given name at birth was Itze-Leib Schmuilowsky but was changed upon arrival in the US.
Kahn's architecture is notable for its simple, platonic forms and compositions.
Through the use of brick and poured-in place concrete masonry, he developed a contemporary and monumental architecture that maintained a sympathy for the site.
While rooted in the International Style, Kahn's architecture was an amalgam of his Beaux Arts education and a personal aesthetic impulse to develop his own architectural forms.
Kahn received the AIA Gold Medal in 1971 and the RIBA Gold Medal in 1972.
Louis Kahn is considered one of the foremost architects of the late twentieth century.
On March 17, 1974, he died of a heart attack in a men's restroom in Pennsylvania Station in New York City.
Education/ Occupation
He attended the University of Pennsylvania and received his Bachelors degree in architecture at the age of 24.
After college, he worked as a senior draftsman in the office of Philadelphia City Architect John Molitor.
To find his inspiration, he traveled through Europe visiting castles and medieval strongholds in 1928, only 4 years after graduating.
He finally started his own firm in 1935.
While he still designed and worked as a design critic on the side, Louis became a professor of architecture at Yale school of Architecture.
Personal designs
Kahn created many unique an intricate buildings, but among his most memorable were…
* The Yale University Art gallery: 1951.
* The Jonas Salk institute for Biological Studies: 1965
* The Margaret Esherick house: 1961
* The National Assembly building: 1962
LAURENCE WILFRED BAKER
British born Indian Architect
Born in Birmingham,UK (March 2,1917).
Educated at King Edwards Grammar School & The Birmingham School of Architecture.
He moved to India in 1945 in part as a missionary.
He obtained Indian citizenship in 1989 and resided in Tiruvananthapuram(Trivandrum), Kerala
ARTIST, ARCHITECT, CARTOONIST etc.,
Joseph allen stein
Born in 1912 in USA
Studied Architecture at the University of Illinois.
He worked with the great architect Richard Neutra.
A major figure in the establishment of a regional modern architecture in the San Francisco Bay area in the 1940’s and 1950’s during the early days of Environmental design.
Contemporary architecture means present day diverse, influencial and innovative design.
It is not a synonym of modern architecture but applies to a range of styles built recently for current use.
The design is always spacious ,connecting indoors and outdoors.
It includes reusing of old materials or structures or use of natural materials.
Contemporary means of current time , always evolving or changing.
So it can be said that contemporary architecture started when the very first designs were made.
First introduced in late 20th century and common in 21st century.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
2. soundsound
Travels in straight Lines.Travels in straight Lines.
Travels in crooked lines.Travels in crooked lines.
Can be focused.Can be focused.
Can be absorbed by a surfaceCan be absorbed by a surface
Can be diffractedCan be diffracted
Can interfere “with itself”Can interfere “with itself”
Is dependent on the properties of the room.Is dependent on the properties of the room.
3. sound ABsoRptionsound ABsoRption
Acoustic absorption or sound
absorption refers to the process by which a
material, structure, or object takes in sound
energy when sound waves are encountered,
as opposed to reflecting the energy. Part of
the absorbed energy is transformed
into heat and part is transmitted through the
absorbing body. The energy transformed into
heat is said to have been 'lost'.
4. diffRActiondiffRAction
Sound can “bend” around objects.Sound can “bend” around objects.
Sound can change its properties dependingSound can change its properties depending
upon the size of the wavelength comparedupon the size of the wavelength compared
to objects.to objects.
The Diffraction effect can be understoodThe Diffraction effect can be understood
via one of the early theories of waves.via one of the early theories of waves.
5. Listen to a tone and move yourListen to a tone and move your
head from side to side.head from side to side.
What do you hear?What do you hear?
Why do you hear it??Why do you hear it??
ExpERimEntExpERimEnt
8. considER A WAllconsidER A WAll
How smooth is it?How smooth is it?
Smooth is in the feel of the feeler!Smooth is in the feel of the feeler!
Smooth or Rough are Relative terms.Smooth or Rough are Relative terms.
We define:We define:
– SMOOTH – Variations occur on a scale muchSMOOTH – Variations occur on a scale much
smaller than a wavelength of the sound we aresmaller than a wavelength of the sound we are
considering.considering.
– ROUGH – The variations in the surface areROUGH – The variations in the surface are
comparable to the size of the wavelength.comparable to the size of the wavelength.
10. soft WAllssoft WAlls
A soft wall (like rubber or cork) will yield whenA soft wall (like rubber or cork) will yield when
you push on it.you push on it.
Sound (music) pressure pushes on the wall.Sound (music) pressure pushes on the wall.
IF the wall deforms, than a force (pA) times aIF the wall deforms, than a force (pA) times a
distance (the deformation), means that the wavedistance (the deformation), means that the wave
does WORK.does WORK.
The sound therefore loses some energy when itThe sound therefore loses some energy when it
hits such a wall.hits such a wall.
The reflection isn’t as strong as one from an “un-The reflection isn’t as strong as one from an “un-
yielding” wall.yielding” wall.
11. considER An outdooRconsidER An outdooR
concERtconcERt
Musicians on stageMusicians on stage
People in the audiencePeople in the audience
No Walls or CeilingsNo Walls or Ceilings
Only reflections possible are fromOnly reflections possible are from
structures in back of the musicians.structures in back of the musicians.
18. WhAT does “foCus” meAnWhAT does “foCus” meAn
Sound waves hit a surface which can be called aSound waves hit a surface which can be called a
mirror.mirror.
The mirror surface can be curved so that rays ofThe mirror surface can be curved so that rays of
sound from different directions can be made tosound from different directions can be made to
come together at the same place.come together at the same place.
– Like a lensLike a lens
In a concert hall, too much focusing can alsoIn a concert hall, too much focusing can also
mean that there is only ONE good seat in themean that there is only ONE good seat in the
house!house!
20. WhisperinG GAlleryWhisperinG GAllery
Note – This Wren design was actually a spherical surface
that doesn’t really focus that well. It probably comes close to
a portion of an ellipse.
26. An interesting ApplicAtionAn interesting ApplicAtion
With this device, you can
magnify faint or distant
sounds with a clarity
you never thought
possible.
28. in A reAl roomin A reAl room
What about theWhat about the
walls?walls?
SmoothSmooth
– How Smooth?How Smooth?
RoughRough
– How Rough?How Rough?
29. WhAt else?WhAt else?
Small objects will scatter or diffract sound so itSmall objects will scatter or diffract sound so it
can be heard in non-straight lines.can be heard in non-straight lines.
– Around edges, etc.Around edges, etc.
Small objects do very little to long wavelengthSmall objects do very little to long wavelength
sounds (low tones). They are like the eEverreadysounds (low tones). They are like the eEverready
Battery … they keep going and going and goingBattery … they keep going and going and going
…..…..
Higher frequency sounds will be deflected orHigher frequency sounds will be deflected or
absorbed more than low frequency sounds.absorbed more than low frequency sounds.
35. Room Full Of Sound
Cut a small Window into
the wall
EACH SECOND THE SAME FRACTION OF SOUND WILL
LEAK FROM THE ROOM LEADING TO WHAT IS CALLED
EXPONENTIAL DECAY.
37. Lets start a musical tone and listen toLets start a musical tone and listen to
the auditorium with a sound recorder.the auditorium with a sound recorder.
38. How about tHe return toHow about tHe return to
silence?silence?
There is a steady musical sound in theThere is a steady musical sound in the
auditorium.auditorium.
The symphony is over.The symphony is over.
The music suddenly stops. It takes aThe music suddenly stops. It takes a
certain time for the sound level to get to acertain time for the sound level to get to a
very small level.very small level.
The time it takes for the auditorium soundThe time it takes for the auditorium sound
to drop to 1/1,000,000to drop to 1/1,000,000thth
of the steady level isof the steady level is
called thecalled the REVERREVERBERATION TIMEBERATION TIME..
39. tHe return to PeacetHe return to Peace
Reverberation Time
42. resonantresonant
Panels/absorbersPanels/absorbers
A resonant absorber is a vibrational
system that “runs” on sound pressure. As
vibrational science will tell us a resonant
absorber is a mass vibrating against a
spring. The mass is the cabinet and front wall
or diaphragm. The spring is the air inside the
cavity of the resonant absorber.
43. resonantresonant
Panels/absorbersPanels/absorbers
If you change the vibrating mass and
stiffness of the spring, you can control and
tune the resonant absorber to the resonant
frequency of choice. The internal mass or
cabinet depth determines design frequency.
The spring or internal air and cavity are used
for achieving rate of absorption above the
unit’s designed for resonant frequency.
There are two types of resonant absorbers:
Helmholtz and Diaphragmatic or membrane.