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Баланс мощности
Сделано:
Кылышкожа Нурай, КТиТ-23
Баланс мощности
Мощность, которую двигатель
развивает на коленчатом валу,
называется эффективной (Ne).
За время работы МТА не вся
Ne затрачивается на
выполнение полезной работы.
Баланс мощности
Часть ее расходуется на:
• Nт – преодоление сил трения
• Nкач – на собственное передвижение
• Nб – на буксование движителей
• Nпод – на преодоление подъемов
• Nв – на преодоление сопротивления воздуху
• Nj – на преодоление сил инерции
Остальная часть Nе, затрачивается на передвижение рабочих
машин является полезной и называется крюковой мощностью
(Nкр)
Баланс мощности при движении
При
неравномерном
движении
𝐍е
= 𝐍т + 𝐍кач + 𝐍б
+ 𝐍под + 𝐍в + 𝐍𝐣
+ 𝐍кр
Так как 𝑁𝑗 = 0 и
𝑁в = 0 при
равномерном
движении
𝐍е
= 𝐍т + 𝐍кач + 𝐍б
+ 𝐍под + 𝐍кр
Крюковая
мощность
𝐍кр = 𝐍е −
𝐍т + 𝐍кач + 𝐍б +
Баланс мощности
Трактор может развивать
различную силу тяги на
крюке в зависимости от
включенной передачи и
почвенных условий.
Работа, совершаемая
трактором в единицу времени,
представляемой собой
крюковую мощность и может
быть определена по формуле:
Крюковая мощность
•Pкр – сила тяги на
крюке (Н)
•Vр – рабочая скорость
(м/с)
𝑵кр =
𝑷кр ∗
𝑽р(Вт),
где
Отсюда 𝑷кр =
𝑵кр
𝑽р
(Н)
Nкр изменяется в зависимости от перемены почвенных и других условий работы, а
также от износа некоторых деталей и нарушения регулировок узлов.
Степень использования мощности оценивающий КПД
Общий КПД
𝜼т.о =
𝑵кр + 𝑵вом
𝑵е
Nвом – мощность на привод через ВОМ
Тяговый КПД
𝜂т =
𝑁кр
𝑁е

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balans_moshchnosti.pptx

  • 2. Баланс мощности Мощность, которую двигатель развивает на коленчатом валу, называется эффективной (Ne). За время работы МТА не вся Ne затрачивается на выполнение полезной работы.
  • 3. Баланс мощности Часть ее расходуется на: • Nт – преодоление сил трения • Nкач – на собственное передвижение • Nб – на буксование движителей • Nпод – на преодоление подъемов • Nв – на преодоление сопротивления воздуху • Nj – на преодоление сил инерции Остальная часть Nе, затрачивается на передвижение рабочих машин является полезной и называется крюковой мощностью (Nкр)
  • 4. Баланс мощности при движении При неравномерном движении 𝐍е = 𝐍т + 𝐍кач + 𝐍б + 𝐍под + 𝐍в + 𝐍𝐣 + 𝐍кр Так как 𝑁𝑗 = 0 и 𝑁в = 0 при равномерном движении 𝐍е = 𝐍т + 𝐍кач + 𝐍б + 𝐍под + 𝐍кр Крюковая мощность 𝐍кр = 𝐍е − 𝐍т + 𝐍кач + 𝐍б +
  • 5. Баланс мощности Трактор может развивать различную силу тяги на крюке в зависимости от включенной передачи и почвенных условий. Работа, совершаемая трактором в единицу времени, представляемой собой крюковую мощность и может быть определена по формуле:
  • 6. Крюковая мощность •Pкр – сила тяги на крюке (Н) •Vр – рабочая скорость (м/с) 𝑵кр = 𝑷кр ∗ 𝑽р(Вт), где Отсюда 𝑷кр = 𝑵кр 𝑽р (Н)
  • 7. Nкр изменяется в зависимости от перемены почвенных и других условий работы, а также от износа некоторых деталей и нарушения регулировок узлов. Степень использования мощности оценивающий КПД Общий КПД 𝜼т.о = 𝑵кр + 𝑵вом 𝑵е Nвом – мощность на привод через ВОМ Тяговый КПД 𝜂т = 𝑁кр 𝑁е