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Консультация № 186885
02.12.2012, 21:59
145.00 руб.
0
1
1
Здравствуйте! Прошу помощи в следующих вопросах:
1. Манометр подключен к баку с водой, заданы высоты h1 и h2. Определить избыточное давление воды на дно бака, если показание манометра P1.
2. Гидравлический пресс используется для испытания задвижек на плотность с максимальным давлением среды Rм. Определить усилие R, необходимое для создания давления испытания равно 1,5 Rм, если даны D, d, I, b.
1. Манометр подключен к баку с водой, заданы высоты h1 и h2. Определить избыточное давление воды на дно бака, если показание манометра P1.
2. Гидравлический пресс используется для испытания задвижек на плотность с максимальным давлением среды Rм. Определить усилие R, необходимое для создания давления испытания равно 1,5 Rм, если даны D, d, I, b.
Обсуждение
02.12.2012, 22:40
общий
это ответ
Здравствуйте, Дмитрий!
Рассмотрим первую задачу. Будем полагать, что известны величины
а также плотность воды в баке 
и плотность окружающего бак воздуха 
которую будем считать постоянной по всей высоте бака (иначе можно воспользоваться барометрической формулой).
Находим избыточное давление воды в точке
:
где
- атмосферное давление на уровне точки 
Находим избыточное давление столба воды высотой
на дно бака, т. е. в точке 
:
Находим избыточное давление воды на дно бака:
Рассмотрим вторую задачу. Для того, чтобы пресс развил усилие, равное
необходимо давление, равное 
Это давление создаётся правым поршнем под действием силы 
Эта сила возникает на рычаге под действием момента 
Чтобы создать такой момент, к концу рычага нужно приложить силу 
С уважением.
Рассмотрим первую задачу. Будем полагать, что известны величины
а также плотность воды в баке и плотность окружающего бак воздуха которую будем считать постоянной по всей высоте бака (иначе можно воспользоваться барометрической формулой).Находим избыточное давление воды в точке
:где
- атмосферное давление на уровне точки Находим избыточное давление столба воды высотой
на дно бака, т. е. в точке :Находим избыточное давление воды на дно бака:
Рассмотрим вторую задачу. Для того, чтобы пресс развил усилие, равное
необходимо давление, равное Это давление создаётся правым поршнем под действием силы Эта сила возникает на рычаге под действием момента Чтобы создать такой момент, к концу рычага нужно приложить силу С уважением.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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