Question
Download Solution PDFWhat is Hammer blow?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Hammer Blow:
- A Hammer blow is the maximum vertical unbalanced force caused by the mass provided to balance the reciprocating masses.
- Its value is \(m\omega^2 r\) . It varies as the square of the speed.
- At high speeds, the force of the hammer blow could exceed the static load on the wheels and the wheels can be lifted off the rail when the direction of the hammer blow will be vertically upwards.
- The unbalanced force along the perpendicular to the line of stroke due to the balancing mass 'B', at radius 'b' in order to balance reciprocating parts only is \(Bb\omega^2\sinθ\). This force will be maximum when sin θ is unity. i.e. θ = 90° or 270°.
∴ Hammer blow = \(Bb\omega^2\)
- The effect of hammer blow is the cause of the variation in pressure between the wheel and the rail.
Last updated on Jul 8, 2025
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