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Calculate the belt length in meters, needed for the drive. Calculate the power transmitted.

Physics

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Step-by-step solution

5 steps
  1. List the given values and convert them to standard units.

    Power transmitted, P=24 kW=24000 WP = 24 \text{ kW} = 24000 \text{ W}.
    Diameter of the driving pulley, D=130 mm=0.13 mD = 130 \text{ mm} = 0.13 \text{ m}.
    Rotational speed of the driving pulley, N=240 r/minN = 240 \text{ r/min}.
    Contact angle, θ=170∘\theta = 170^\circ.
    Coefficient of friction, μ=0.3\mu = 0.3.

  2. Calculate the belt velocity (vv).

    v=πDN60v = \frac{\pi D N}{60} v=π×0.13 m×240 r/min60 s/minv = \frac{\pi \times 0.13 \text{ m} \times 240 \text{ r/min}}{60 \text{ s/min}} v=π×0.13×24060 m/sv = \frac{\pi \times 0.13 \times 240}{60} \text{ m/s} v=0.52π m/s≈1.6336 m/sv = 0.52 \pi \text{ m/s} \approx 1.6336 \text{ m/s}
  3. Convert the contact angle to radians.

    θrad=170∘×π180∘\theta_{rad} = 170^\circ \times \frac{\pi}{180^\circ} θrad=1718π rad≈2.9671 rad\theta_{rad} = \frac{17}{18} \pi \text{ rad} \approx 2.9671 \text{ rad}
  4. Set up equations for tensions.

    The power transmitted is given by:

    P=(T1−T2)vP = (T_1 - T_2)v 24000 W=(T1−T2)×1.6336 m/s24000 \text{ W} = (T_1 - T_2) \times 1.6336 \text{ m/s}

    So, T1−T2=240001.6336≈14691.48 N(Equation 1)T_1 - T_2 = \frac{24000}{1.6336} \approx 14691.48 \text{ N} \quad (Equation \ 1)

    The relationship between tight side tension (T1T_1) and slack side tension (T2T_2) is:

    T1T2=eμθrad\frac{T_1}{T_2} = e^{\mu \theta_{rad}}

    First, calculate the exponent:

    μθrad=0.3×2.9671≈0.89013\mu \theta_{rad} = 0.3 \times 2.9671 \approx 0.89013

    Now, calculate eμθrade^{\mu \theta_{rad}}:

    eμθrad=e0.89013≈2.4354e^{\mu \theta_{rad}} = e^{0.89013} \approx 2.4354

    So, T1T2=2.4354\frac{T_1}{T_2} = 2.4354, which means T1=2.4354T2(Equation 2)T_1 = 2.4354 T_2 \quad (Equation \ 2)

  5. Solve the system of equations for T1T_1 and T2T_2.

    Substitute Equation 2Equation \ 2 into Equation 1Equation \ 1:

    2.4354T2−T2=14691.482.4354 T_2 - T_2 = 14691.48 1.4354T2=14691.481.4354 T_2 = 14691.48 T2=14691.481.4354≈10235.80 NT_2 = \frac{14691.48}{1.4354} \approx 10235.80 \text{ N}

    Now, find T1T_1 using Equation 2Equation \ 2:

    T1=2.4354×10235.80 NT_1 = 2.4354 \times 10235.80 \text{ N} T1≈24929.80 NT_1 \approx 24929.80 \text{ N}

    The Tight-side tension is 24.93 kN\boxed{\text{24.93 kN}} and the Slack-side tension is 10.24 kN\boxed{\text{10.24 kN}}.

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