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For a 300 mm long sliding lubricated bearing, the viscosity of oil is 0.008 kg/ms during steady operation at 80°C. The average oil film thickness between the shaft and journal is 1.2 mm. If shaft of 80 mm diameter is rotated at 750 rpm, the amount of torque (in Nm) needed to overcome bearing friction would be_______. (Answer up to three decimal places)
    Correct answer is '0.063'. Can you explain this answer?
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    For a 300 mm long sliding lubricated bearing, the viscosity of oil is...
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    For a 300 mm long sliding lubricated bearing, the viscosity of oil is...
    Understanding the Problem
    To calculate the torque required to overcome bearing friction in a lubricated sliding bearing, we need to consider the viscosity of the lubricant, the geometry of the bearing, and the operating conditions.
    Given Data
    - Length of the bearing (L): 300 mm = 0.3 m
    - Viscosity of oil (μ): 0.008 kg/ms
    - Average oil film thickness (h): 1.2 mm = 0.0012 m
    - Diameter of the shaft (D): 80 mm = 0.08 m
    - Rotational speed (N): 750 rpm
    Calculating Torque
    1. Determine the Bearing Area (A):
    - The area of the bearing surface in contact can be calculated as:
    A = π * D * L
    2. Calculate the Shear Stress (τ):
    - Shear stress in the lubricant can be calculated using the formula:
    τ = μ * (V/h)
    - Where V is the velocity of the shaft surface, calculated as:
    V = (π * D * N) / 60
    3. Calculate the Torque (T):
    - The torque required to overcome friction is given by:
    T = τ * A * (D/2)
    - Here, we consider the radius (D/2) as the lever arm.
    Final Calculation Steps
    - Substitute the values into the equations to find A, V, τ, and finally T.
    - After performing the calculations, you will arrive at the torque needed, which is approximately 0.063 Nm.
    This detailed understanding of the problem and the steps involved will help you see how the final answer of 0.063 Nm is derived.
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    For a 300 mm long sliding lubricated bearing, the viscosity of oil is 0.008 kg/ms during steady operation at 80°C. The average oil film thickness between the shaft and journal is 1.2 mm. If shaft of 80 mm diameter is rotated at 750 rpm, the amount of torque (in Nm) needed to overcome bearing friction would be_______. (Answer up to three decimal places)Correct answer is '0.063'. Can you explain this answer?
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    For a 300 mm long sliding lubricated bearing, the viscosity of oil is 0.008 kg/ms during steady operation at 80°C. The average oil film thickness between the shaft and journal is 1.2 mm. If shaft of 80 mm diameter is rotated at 750 rpm, the amount of torque (in Nm) needed to overcome bearing friction would be_______. (Answer up to three decimal places)Correct answer is '0.063'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about For a 300 mm long sliding lubricated bearing, the viscosity of oil is 0.008 kg/ms during steady operation at 80°C. The average oil film thickness between the shaft and journal is 1.2 mm. If shaft of 80 mm diameter is rotated at 750 rpm, the amount of torque (in Nm) needed to overcome bearing friction would be_______. (Answer up to three decimal places)Correct answer is '0.063'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For a 300 mm long sliding lubricated bearing, the viscosity of oil is 0.008 kg/ms during steady operation at 80°C. The average oil film thickness between the shaft and journal is 1.2 mm. If shaft of 80 mm diameter is rotated at 750 rpm, the amount of torque (in Nm) needed to overcome bearing friction would be_______. (Answer up to three decimal places)Correct answer is '0.063'. Can you explain this answer?.
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