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Q11 a) What is the basis for piston rod design? Explain the significance of area ratio. b)...

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Mechanical Engineering

Q11 a) What is the basis for piston rod design? Explain thesignificance of area ratio.

b) List 4 of the likely causes for slow or erratic motion of anactuator in a hydraulic equipment.

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Basis for piston rod design

The piston rod in a pneumatic cylinder will act as a strut when it is subjected to a compressive load or it exerts a thrust. Therefore the rod must be of sufficient diameter to prevent buckling. Euler’s strut theory is used to calculate a suitable piston rod diameter to withstand buckling.

Because of area ratio the pressure on bore end could be reduced.

Causes for slow or erratic motion of actuator

  1. Insufficient control pressure for valves
  2. Misadjusted or malfunctioning servo amplifier
  3. No lubrication of machine ways or linkage
  4. Malfunctioning feedback transducer
  5. Worn or damaged cylinder or motor
  6. Sticking servo valve
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