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Math Help - velocity of piston

  1. #1
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    velocity of piston

    The instantaneous configuration of a slider crank mechanism has a crank GH 10cm long, the connecting rod HP is 50cm. The crank makes an angle of 60 degree with the inner dead centre position and is rotating at 110 rev/min. Determine the velocity of the piston P and the angular velocity of the link HP.
    Here is the diagram

    my guess would be to use this formula [ -rw(cos(60)+((sin2(60)/(2xsqrt(nē-sinē(6…‡ ]
    where n = L/R
    but i get a negative answer which seems a bit low.
    can someone give me steps on how to complete this question correctly? because i aim to revise from it for my exam thank you
    Attached Thumbnails Attached Thumbnails velocity of piston-fds.png  
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  2. #2
    Senior Member BAdhi's Avatar
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    Re: velocity of piston

    velocity of piston-untitled.png

    find b from cosine rule then you can find the instantaneous center. From that you can find the answer.
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