Unsound Mind

By Ti Levy

22 12 09 presentation

Acoustic wall as a environmental and urban organizer and design

Acoustic wall through the landscape, cutting, dividing and designing the urban nature, runs from one attraction point to another while sculpturing the environment.
With the idea of quality life style for young families we will follow the wall in to a better tomorrow.
The area will contain sport activities for a verity of age groups. from the first day, the young mother will want her quality time with her child to take place in the open air, to an afternoon activities for energetic youth to explore their limits…

The designers approach, a more specific concept.

Generative wall designed by the sound wave and acoustic qualities, functions volumes and the relations between the functions the road and the neighborhood.

The design presses
we started the design throw a plan, examined  the functions qualities, volumes and acoustic consensuses.

 

Materials, from recycled to functions. 
ytong-tec block
[ http://www.ytong.co.il/var/16/352781-Ytongtech.pdf ]
a block with high acoustic quality and resistant to environmental damage, whether and fire. easy  to maintain and nice clean look.

shredded rubber from tallies to glowed scattering.
and many more…  marked on the poster in a list of icons

Filed under: concept, plan, the project, weight Points, , ,

From Inspiration To Concept

as an inspiration the artist Naed Kahn who studies wind and Turbulence.

A small PDF about his work.   

A few Pictures of His Work with wind…

The effects of reflection and motion he gets by using the wind pass by the metal leafs.

http://nedkahn.com/statement.html

For The concept we will take the aesthetic qualities of the metal leafs in motion and replace the force, from wind to sound wave.

By using this form we can talk about urban nature and maybe even generate power out of the action of the leafs.

 

videos of Kahn

 

Filed under: Uncategorized

The Site

The Site | Rishon Lezion

Filed under: The Site, weight Points, , ,

Research – summary Nov 09

Research – summary Nov 09


Filed under: weight Points, , ,

measurement 2 | Group no. 5 | Shimrit Cohen & Ti Levy

| Method of measuring

[1] Measuring in 5 different spots.
[2] From both sides of the barrier.
[3] calculating the relative decrease in dB.

Pic1

| The site

Map

| The mesuring   a

A

Pic_a

| The mesuring   b

BPic_b1Pic_b2

| The mesuring   c

C

Pic_C1Pic_C2

| The mesuring   d

D

Pic_d2Pic_d1

| The mesuring   e

E

Filed under: Uncategorized,

SoundWave – ? ! – By Shimrit Cohen and Ti Levy

As we know from our high school science classes, sound waves are created when an object moves or vibrates. When these waves reach our ears, they cause our eardrums to vibrate, sending signals to the brain that we interpret as sound.

wave

| Frequency
[number of wave crests per unit time that pass a fixed location | measured in Hz- the number of waves per second]
measures the tone or pitch of a sound.
For example, a bass guitar plays lower frequencies than a violin.
Human beings usually hear 15 to 20,000 [Hz] frequency sound.

Frequency

| Amplitude

[the wave height | measured in dB] used to measure the intensity of a sound

A measurement of the wave traveling through the air is used as an indication of the intensity of sound or its volume, and is described in terms of a scale called the decibel (dB). Noise measurements made by filtering high- and low-pitched sounds—approximating the way an average person hears sounds—is called the A-weighted level or dBA [1924].

0 dB     |          the faintest sound we can hear;
30 dB   |          a quiet library or in a quiet location in the country;
45 dB   |          typical office space or ambience in the city at night;
60 dB   |          a restaurant at lunch time;
70 dB   |          the sound of a car passing on the street;
80 dB   |          loud music played at home;
90 dB   |          the sound of a truck passing on the street;
100 dB |          the sound of a rock band;
115 dB |          limit of sound permitted in industry; and
120 dB |          deafening.

The dB(A) scale begins at zero, which represents the faintest sound that can be heard by humans with very good hearing. Conversations take place in the 50 dB(A) range and a chainsaw whines at about 100 dB(A). Normal highway traffic sounds rank about 75 dB(A) and jet airliners around 90 dB(A). For most people, discomfort starts in the 70 to 80 dB(A) range, with the threshold of pain around 140 dB(A). The Federal Highway Administration (FHWA) has chosen 67 decibels as the point where state and federal agencies must consider reducing the noise level.

 

Amplitude

www.quietpavement.com

 

 

| Sound behavior

Because the sound has the properties as wave, it has properties of “reflection” and “transmission”, and attenuates in accordance with the distance. These properties are illustrated below for reference.

 

Reflection

Transmission

 

| Atmospheric effects

Winds will increase sounds downwind from a source and reduce them upwind. This is not solely a result of the velocity effect, but also because the spherical wave-front is deformed by the prevailing wind.

wind_effects

As discussed previously, the speed of sound is dependant on temperature, the higher the temperature, the higher the speed. This means that when the temperature near the ground is higher than that of the upper air, sound rays tend to arc upwards slightly. Thus less energy will reach a listener some distance away at ground level. (For a given amount of sound energy, the distribution area is increased).

 At night, when the ground surface is cooler than the upper air, the inverse occurs: sound energy tends to arc downwards. (For a given amount of sound energy, the distribution area is reduced).

temp_gradient

| Barrier Design

Barriers, such as walls or screens, will act to create an acoustic shadow. The reduction in sound level within this shadow zone is dedendant on frequency (as we discussed earlier). At high frequencies the effect of the barrier is most pronounced whereas at low frequencies much diffraction occurs at the edges, so the shadow effect is diminished.

 

shadow

| Type of Road and Average Speed
Rural roads – 110 km/h speed limit – use 108
Urban Freeway – 90 km/h speed limit – use 92
Urban Highway – 70 km/h speed limit – use 65
Urban Street – Dual Carriageway – use 60
Urban Street – Single Carriageway – use 55
Urban Street – Single Congested – use 50

 

Filed under: weight Points,

Research_No’002143 Publish on Page1

 

First field measurement all the data and pictures on the new page.

ViewToPointC_Noon_02

Filed under: weight Points, ,

Ayalon highway

Vodpod videos no longer available.

Just a beautiful video by “thomasschlijper” posted on YouTube of Ayalon highway and rail road.
more about “090215 ayalon“, posted with vodpod

Filed under: Videos

Background – over and under

This Blog posted By Ti Levy within a course – Acoustic barriers between main roads and residence areas

in The beginning it will be mostly my observations and research and later on it hopefully develop into a working product.

Filed under: weight Points