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Консультация № 190500
30.01.2017, 08:39
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30.01.2017, 22:57
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Обсуждение
30.01.2017, 13:15
общий
Здесь, по-моему, не хватает данных: во-первых , где четырехзвенник( здесь только 3 звена, во-вторых , нет ни одного линейного размера
30.01.2017, 22:56
общий
это ответ
Здравствуйте, alenchik2545!
Поскольку звенья ОА и ВС вращаются вокруг соответственно точек О и С, в рассматриваемый момент точка А движется вертикально вверх (vAx=0), а точка В - горизонтально вправо (vBy=0).
при этом при вращении звена AB с угловой скоростью [$969$]=d[$945$]/dt скорости этих точек выражаются следующим образом
vA=vAy=vAy-vBy=-d(AB[$183$]sin[$945$])/dt=-[$969$][$183$]AB[$183$]cos[$945$]
vB=vBx=vBx-vAx=d(AB[$183$]cos[$945$])/dt=-[$969$][$183$]AB[$183$]sin[$945$]
найдём отношение скоростей
vB/vA=sin[$945$]/cos[$945$]=tg[$945$]
отсюда мгновенная скорость точки B
vB=vA[$183$]tg30[$176$]=1м/с[$183$][$8730$]3/3[$8776$]0.577 м/с
Поскольку звенья ОА и ВС вращаются вокруг соответственно точек О и С, в рассматриваемый момент точка А движется вертикально вверх (vAx=0), а точка В - горизонтально вправо (vBy=0).
при этом при вращении звена AB с угловой скоростью [$969$]=d[$945$]/dt скорости этих точек выражаются следующим образом
vA=vAy=vAy-vBy=-d(AB[$183$]sin[$945$])/dt=-[$969$][$183$]AB[$183$]cos[$945$]
vB=vBx=vBx-vAx=d(AB[$183$]cos[$945$])/dt=-[$969$][$183$]AB[$183$]sin[$945$]
найдём отношение скоростей
vB/vA=sin[$945$]/cos[$945$]=tg[$945$]
отсюда мгновенная скорость точки B
vB=vA[$183$]tg30[$176$]=1м/с[$183$][$8730$]3/3[$8776$]0.577 м/с
03.02.2017, 08:57
общий
это ответ
Здравствуйте, alenchik2545!
Точка
принадлежит и звену 
которое вращается вокруг точки 
Поэтому скорость 
точки направлена перпендикулярно отрезку 
Применим теорему о проекциях скоростей двух точек тела. Спроецируем векторы 
скорости точки 
и на ось 
Получим
(м/с).
В соответствии с теоремой вектор направлен горизонтально вправо.
Точка
принадлежит и звену которое вращается вокруг точки Поэтому скорость точки направлена перпендикулярно отрезку Применим теорему о проекциях скоростей двух точек тела. Спроецируем векторы скорости точки и на ось Получим (м/с).В соответствии с теоремой вектор
направлен горизонтально вправо.
Об авторе:
Facta loquuntur.
Facta loquuntur.
03.02.2017, 08:59
общий
Адресаты:
epimkin Здесь, по-моему, не хватает данных: во-первых , где четырехзвенник( здесь только 3 звена, ...
Четвёртым звеном является стойка
Об авторе:
Facta loquuntur.
Facta loquuntur.
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