Pressure altitude что это

pressure altitude

Смотреть что такое «pressure altitude» в других словарях:

Pressure altitude — In aviation, pressure altitude is the indicated altitude when an altimeter is set to an agreed baseline pressure setting. This setting 101,325 Pa, equivalent to 1013.25 millibar (or hectopascals), or 29.92 inches Hg is equivalent to the air… … Wikipedia

pressure altitude — noun : the altitude corresponding to a given pressure in a standard atmosphere * * * Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * pressure altitude noun (aeronautics) … Useful english dictionary

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere (ICAO). It is the height of an aircraft as measured from an assumed sea level atmospheric pressure level of 1013.2 hectopascals… … Aviation dictionary

pressure-altitude — barometrinis lygis statusas T sritis Gynyba apibrėžtis Atmosferos slėgis, atitinkantis tam tikrą aukštį standartinės atmosferos sąlygomis. atitikmenys: angl. pressure altitude pranc. altitude pression ryšiai: žiūrėk – absoliutusis lygis … NATO terminų aiškinamasis žodynas

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere. See also altitude … Military dictionary

pressure altitude — Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * … Universalium

Altitude — For other uses, see Altitude (disambiguation). Not to be confused with Attitude. Altitude or height is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, and more). As a general definition, altitude… … Wikipedia

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 29.92… … Military dictionary

altitude — i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft… … Aviation dictionary

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 1013.2… … Aviation dictionary

altitude — The vertical distance of a level, a point or an object considered as a point, measured from mean sea level. See also density altitude; drop altitude; elevation; minimum safe altitude; pressure altitude; transition altitude; true altitude … Military dictionary

Источник

pressure altitude

Смотреть что такое «pressure altitude» в других словарях:

Pressure altitude — In aviation, pressure altitude is the indicated altitude when an altimeter is set to an agreed baseline pressure setting. This setting 101,325 Pa, equivalent to 1013.25 millibar (or hectopascals), or 29.92 inches Hg is equivalent to the air… … Wikipedia

pressure altitude — noun : the altitude corresponding to a given pressure in a standard atmosphere * * * Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * pressure altitude noun (aeronautics) … Useful english dictionary

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere (ICAO). It is the height of an aircraft as measured from an assumed sea level atmospheric pressure level of 1013.2 hectopascals… … Aviation dictionary

pressure-altitude — barometrinis lygis statusas T sritis Gynyba apibrėžtis Atmosferos slėgis, atitinkantis tam tikrą aukštį standartinės atmosferos sąlygomis. atitikmenys: angl. pressure altitude pranc. altitude pression ryšiai: žiūrėk – absoliutusis lygis … NATO terminų aiškinamasis žodynas

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere. See also altitude … Military dictionary

pressure altitude — Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * … Universalium

Altitude — For other uses, see Altitude (disambiguation). Not to be confused with Attitude. Altitude or height is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, and more). As a general definition, altitude… … Wikipedia

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 29.92… … Military dictionary

altitude — i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft… … Aviation dictionary

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 1013.2… … Aviation dictionary

altitude — The vertical distance of a level, a point or an object considered as a point, measured from mean sea level. See also density altitude; drop altitude; elevation; minimum safe altitude; pressure altitude; transition altitude; true altitude … Military dictionary

Источник

Документация

Вычислите высоту давления на основе окружающего давления

Aerospace Blockset / Среда / Атмосфера

Описание

Блок Pressure Altitude вычисляет высоту давления на основе окружающего давления. Высота давления является высотой в 1 976 Комитетах по Расширению Стандартной Атмосферы (COESA) Соединенные Штаты с заданным окружающим давлением.

Высота давления также известна как высоту среднего уровня моря (MSL).

Метка порта значка блока Pressure Altitude изменяется на основе модулей ввода и вывода, выбранных из списка Модулей.

Ограничения

Ниже давления 0,3961 Па (приблизительно 0,00006 фунта на квадратный дюйм) и выше давления 101 325 Па (приблизительно 14,7 фунтов на квадратный дюйм), высотные значения экстраполируются логарифмически.

Воздух принят, чтобы быть сухим и идеальный газ.

Порты

Входной параметр

Port_1 — Статическое давление
скаляр | массив

Статическое давление в виде скаляра или массива.

Типы данных: double

Вывод

Port_1 — Высота давления
скаляр | массив

Высота давления, возвращенная как скаляр или вектор.

Типы данных: double

Параметры

Units — Введите модули
Metric (MKS) (значение по умолчанию) | English

Введите модули в виде:

Сила фунта на квадратный дюйм

Программируемое использование

Action for out-of-range input — Из области значений блокируйте поведение
Warning (значение по умолчанию) | None | Error

Из области значений блокируйтесь, поведение в виде следует.

Предупреждение в MATLAB ® Командное окно, симуляция модели продолжается.

Error (значение по умолчанию)

MATLAB возвращает исключение, остановки симуляции модели.

Программируемое использование

Примеры модели

Обозначенная скорость полета от истинного вычисления скорости полета

Как вычислить обозначенную скорость полета из истинной скорости полета с помощью блока Ideal Airspeed Correction. Блоки Aerospace Blockset™ обозначаются в красном.

Ссылки

[1] Американская стандартная атмосфера, 1976, американская государственная типография, Вашингтон, округ Колумбия

Расширенные возможности

Генерация кода C/C++
Генерация кода C и C++ с помощью Simulink® Coder™.

Смотрите также

Документация Aerospace Blockset

Поддержка

© 1994-2021 The MathWorks, Inc.

1. Если смысл перевода понятен, то лучше оставьте как есть и не придирайтесь к словам, синонимам и тому подобному. О вкусах не спорим.

2. Не дополняйте перевод комментариями “от себя”. В исправлении не должно появляться дополнительных смыслов и комментариев, отсутствующих в оригинале. Такие правки не получится интегрировать в алгоритме автоматического перевода.

4. Не имеет смысла однотипное исправление перевода какого-то термина во всех предложениях. Исправляйте только в одном месте. Когда Вашу правку одобрят, это исправление будет алгоритмически распространено и на другие части документации.

5. По иным вопросам, например если надо исправить заблокированное для перевода слово, обратитесь к редакторам через форму технической поддержки.

Источник

pressure altitude

1 pressure-altitude

2 pressure-altitude

3 pressure altitude

4 pressure altitude

5 pressure altitude

6 pressure altitude

7 pressure altitude

8 pressure altitude

9 pressure altitude

10 pressure altitude

11 pressure altitude

12 pressure altitude

13 pressure altitude

14 pressure altitude

15 pressure altitude

16 pressure altitude

17 pressure altitude

18 pressure altitude

19 pressure altitude

20 pressure altitude

См. также в других словарях:

Pressure altitude — In aviation, pressure altitude is the indicated altitude when an altimeter is set to an agreed baseline pressure setting. This setting 101,325 Pa, equivalent to 1013.25 millibar (or hectopascals), or 29.92 inches Hg is equivalent to the air… … Wikipedia

pressure altitude — noun : the altitude corresponding to a given pressure in a standard atmosphere * * * Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * pressure altitude noun (aeronautics) … Useful english dictionary

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere (ICAO). It is the height of an aircraft as measured from an assumed sea level atmospheric pressure level of 1013.2 hectopascals… … Aviation dictionary

pressure-altitude — barometrinis lygis statusas T sritis Gynyba apibrėžtis Atmosferos slėgis, atitinkantis tam tikrą aukštį standartinės atmosferos sąlygomis. atitikmenys: angl. pressure altitude pranc. altitude pression ryšiai: žiūrėk – absoliutusis lygis … NATO terminų aiškinamasis žodynas

pressure altitude — An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the standard atmosphere. See also altitude … Military dictionary

pressure altitude — Meteorol. the altitude for a given pressure in a standard atmosphere, such as that registered by a pressure altimeter. * * * … Universalium

Altitude — For other uses, see Altitude (disambiguation). Not to be confused with Attitude. Altitude or height is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, and more). As a general definition, altitude… … Wikipedia

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 29.92… … Military dictionary

altitude — i. The vertical distance of a level, a point, or an object considered as a point, measured from mean sea level (ICAO). In the case of aircraft in flight, it is normally expressed in flight levels or hundreds of feet. For example, an aircraft… … Aviation dictionary

altitude datum — The arbitrary level from which vertical displacement is measured. The datum for height measurement is the terrain directly below the aircraft or some specified datum; for pressure altitude, the level at which the atmospheric pressure is 1013.2… … Aviation dictionary

altitude — The vertical distance of a level, a point or an object considered as a point, measured from mean sea level. See also density altitude; drop altitude; elevation; minimum safe altitude; pressure altitude; transition altitude; true altitude … Military dictionary

Источник

Pressure Altitude: What it is and Why it’s Important

Knowing how high you are is an essential part of a pilot’s job, right? But did you realize that pilots are concerned with many different types of altitude, not just how high off the ground they are? Pressure altitude is one such example. So what exactly is pressure altitude?

Instead of referencing something physical, like sea level or ground level, pressure altitude is the height above standard pressure. The standard pressure at sea level is 29.92 inHg, but it moves around depending on the weather. To make things easier for certain purposes, pilots refer to their height above 29.92 inHg, which is the pressure altitude.

How Altitude is Measured

It’s clear that pilots need to be concerned with altitude, right? Few things could seem more important than knowing how high the airplane is flying. A pilot needs to clear obstacles, fly over mountains, and maintain safe separation from other planes. To do all of these things, they need to know how high they are.

But measuring altitude is a tricky business. A plane doesn’t naturally know how high it is. There are radio altimeters on large aircraft like airliners that measure the plane’s height above the ground. But these only work below 2,500 feet or so, and only the biggest planes have them.

Pretty much every aircraft has a sensitive altimeter onboard. This device doesn’t measure the distance to the ground—it measures air pressure. It’s a pressure-sensitive barometer, but instead of telling the pilot how much the air pressure has changed, it shows its readings in feet (or meters).

Since the altimeter doesn’t know where sea level or ground level is, the pilot needs to calibrate it throughout the flight. It also means that, depending on how that altimeter is set, it could read any number of things.

Types of Altitude in Aviation

That’s a lot of types of altitude. The pilot’s goal is to simplify this list in flight so that they can look at the altimeter and get a meaningful number. In most cases, they want the indicated altitude to be the true altitude.

This is the most significant number since everything on the pilot’s charts is measured from sea level. When they look at airports, mountain ranges, or get an altitude from air traffic control, everything is referencing the true altitude.

The problem with this is that the air pressure changes as the weather changes. Throughout the day, the altimeter setting will change from higher to lower as air masses move around in the atmosphere.

During the flight, a pilot must update their altimeter setting periodically to ensure the altimeter continues to show an accurate reading. Whenever a new air traffic controller is contacted, the controller gives the current altimeter setting for the area.

Editorial Team Pilots in cockpit of DHC-6 Twin Otter

The Standard Datum Plane (SDP)

Certain standards in aviation were created simply for standardization. When building airplanes, or operating altimeters, it is helpful to know what a “normal” day at sea level looks like. This could then be used as a baseline for aircraft performance.

Of course, in real life, there are few normal days. Air pressure and temperature change with the weather. But someone had to draw a line somewhere.

The line drawn is known as the standard datum plane (SDP). Another way to references this is the International Standard Atmosphere (ISA). The standard conditions at sea level are 29.92 inHg/1013.4 mb and 59 degrees Fahrenheit/15 degrees Celcius.

Why Pressure Altitude is Important to Performance

That’s interesting, but how important are these numbers that make up standard conditions? Pilots consider these numbers far more often than you might imagine.

For one thing, all of an aircraft’s performance data is calculated based on an ISA. The pilot must then correct the numbers to figure out how the plane will act in the actual conditions that it will experience on the day of the flight.

The easiest way to do this is to use the pressure altitude. When discussing things like aircraft performance, the actual location of the ground or sea level doesn’t matter. What does matter is the density of the air.

Pressure altitude is something of an imaginary number used by pilots. They can calculate it based on the weather forecasts, and then they can take that number to their airplane flight manual and look up the performance charts.

Using the pressure altitude, the pilot can quickly figure out:

What is the Pressure Altitude Formula?

How do pilots calculate the pressure altitude? There are two ways.

If an altimeter is handy, the quickest way is to set in standard sea level pressure into the altimeter’s window. By setting 29.92 inHg/1013.4 mb, the altimeter will immediately read pressure altitude.

If no altimeter is handy, a simple math formula will provide the same answer.

Pressure altitude = <(Sea Level Pressure – 29.92) x 1,000>+ true altitude (or field elevation if on the ground)

Pressure Altitude Versus Density Altitude

You may notice that the formula for pressure altitude does not take into account air temperature. The standard temperature at sea level is 15 degrees Celcius, and if it’s any warmer than that, the plane will perform as if it’s at a higher altitude.

When you take pressure altitude and correct it for air temperature, the result is known as density altitude.

Calculating density altitude is a little more complicated since the math formula is more complex. Most pilots will break out their flight computers or use a table or chart to figure out the answer.

Most airplane performance charts know this, and they use pressure altitude as the starting point anyway. The first correction the chart makes will be for temperature, so there’s no need to calculate the density altitude.

Flight Levels

Besides being used for performance, the pressure altitude is used for aircraft separation above a particular altitude. The exact point at which the airspace switches from using true altitude above sea level to pressure altitude above the standard datum plane is known as the “transition level.”

In the United States, the transition level is at 18,000 feet. At this point, all pilots set their altimeters to 29.92 inHg. Since all planes are on the same altimeter setting, pilots don’t have to update it again until they descend below 18,000 feet again.

Above 18,000 feet, altitudes are described as flight levels. For example, 24,000 feet would be FL 240, 30,000 feet would be FL300, and so forth.

The transition level is different in every country. In the United States, the transition level is at 18,000 above sea level, but it is as low as 5,000 feet in some countries.

Источник