تبلیغات
زبانکده - Breaking the sound barrier means what?
 
زبانکده
Come To Learn English
یکم خرداد 89 :: نویسنده : farzam lord
Show romanization
For an explanation about what breaking the sound barrier when happens, you must first sound wave with velocity eyes looked limited. All of you with limited effects and relatively low speed of sound are familiar; reflected sound in the mountains, time delay in hearing a speaker that broadcast everything they hear thunder after seeing power. At sea level and temperature of 22 degrees, speed of sound waves 345 meters per second or 1,240 kilometers per hour are released. The temperature and pressure decreases, the speed of sound is low, so that for the plane at an altitude of 35 thousand feet - where the temperature 54 - 295 degrees is the speed of sound in meters per second or kilometers per hour reaches 1060. Now imagine an audio source, a second pulse in space to play. This pulse can be a spherical shell of air pressure with the speed of sound are great and sound emit imagine (like the circle created in the water after throwing a stone) to the front spheres wave say. If the source is stationary, these spheres, such as concentric circles of water will be, but if the source starts to move, these spheres in order to object will move.
منبع: Www.P30Mania.MihanBlog.Com
So that the distance from the butter on one side (to move) and less on the opposite side will increase. (Figures drawn, you will see this article). The value of this displacement depends on the source velocity to velocity of ..................
 

Show romanization

For an explanation about what breaking the sound barrier when happens, you must first sound wave with velocity eyes looked limited. All of you with limited effects and relatively low speed of sound are familiar; reflected sound in the mountains, time delay in hearing a speaker that broadcast everything they hear thunder after seeing power. At sea level and temperature of 22 degrees, speed of sound waves 345 meters per second or 1,240 kilometers per hour are released. The temperature and pressure decreases, the speed of sound is low, so that for the plane at an altitude of 35 thousand feet - where the temperature 54 - 295 degrees is the speed of sound in meters per second or kilometers per hour reaches 1060. Now imagine an audio source, a second pulse in space to play. This pulse can be a spherical shell of air pressure with the speed of sound are great and sound emit imagine (like the circle created in the water after throwing a stone) to the front spheres wave say. If the source is stationary, these spheres, such as concentric circles of water will be, but if the source starts to move, these spheres in order to object will move.

منبع: Www.P30Mania.MihanBlog.Com

So that the distance from the butter on one side (to move) and less on the opposite side will increase. (Figures drawn, you will see this article). The value of this displacement depends on the source velocity to velocity of sound is. The source velocity is more, the wave fronts that will produce at any given moment, and therefore closer distance fronts against the source is less and less, so that the speed of sound, the source sound wave reaches its it moves. So that the spherical wave front produced against all sources are accumulated. (Eg, nested loops with different Shahay a point on the Mmasnd). Physically represent the wave fronts, air pressure changes and pressure changes so that we hear it hears a sound.
Now imagine all this pressure wave fronts in front of an airplane at a speed threshold that moves the speed of sound can be collected. In this case, each other fronts to reinforce a pressure wave with high amplitude form. This wave, the air resistance force increases and decreases lift force and flight control is difficult. When the aircraft speed increases the speed of sound can take precedence, the dam and through the sound barrier and called to break sound barrier. In this case the wave amplitude, which consists of the shock wave is called the air is released and reaches the ground. Intensity of wave height reached to the ground plane and its size depends on. If the aircraft is close enough to the ground pressure wave is strong enough that can cause glass to break, destroy buildings or hearing loss and weak people. Breaking the sound barrier or traverse speed of sound, the first time in October 14, 1947 by Chuck and Bygr, Air Force pilot with Air America-X1, which was built for that purpose occurred. Today, more easily from fighter aircraft to pass the speed of sound, so that the SR71 to speed as some 3600 kilometers per hour three times the speed of sound appears. But the image above to allow you to see this audio phenomenon! This picture, by John Gay in July 1999 has been an F18 Hornet aircraft in passing the sound barrier over the Pacific Ocean shows. Make no mistake. Abrsfyd paint is sound. Around the wings of aircraft flight conditions, especially in the audio frequency of low pressure area is created. If the weather is too much steam, low air pressure, water in the air compresses and creates a cloud of steam around it is. When the aircraft passes the sound barrier, the local air shock wave with turbulent and vapor disappears. John Gay Images in a moment heard the boom, just before Napdydshdn cloud is.

 





نوع مطلب : مقاله: article، 
برچسب ها :


درباره وبلاگ



مدیر وبلاگ : farzam lord
نویسندگان
نظرسنجی
خواننده ی برتر کیست؟













آمار وبلاگ
  • کل بازدید :
  • بازدید امروز :
  • بازدید دیروز :
  • بازدید این ماه :
  • بازدید ماه قبل :
  • تعداد نویسندگان :
  • تعداد کل پست ها :
  • آخرین بازدید :
  • آخرین بروز رسانی :
Free Online Language Lessons: Learn Russian, English, Spanish, Italian...





Powered by WebGozar

Google

در این وبلاگ
در كل اینترنت /font>