- #1
hollidca
- 13
- 0
Hi for my design project at uni I am to design a truss crane to a certain spec.
I can easily calculate the forces in a truss without the pulley systems.
However when I have the pulleys I'm not sure how this affects the forces in the truss.
I have the load attached via a 4 cable pulley at the end of the beam of the crane, i understand the force here is still the load * gravity straight downwards. the lifting cable from this pulley goes to a pulley at the joint of the beam and central column, the cable then goes straight to the ground and attached to the cable drum. Is there a 45 degree force from the tension in the cable on the pulley attached at the joint of the beam and column?
Thank you for any help.
I can easily calculate the forces in a truss without the pulley systems.
However when I have the pulleys I'm not sure how this affects the forces in the truss.
I have the load attached via a 4 cable pulley at the end of the beam of the crane, i understand the force here is still the load * gravity straight downwards. the lifting cable from this pulley goes to a pulley at the joint of the beam and central column, the cable then goes straight to the ground and attached to the cable drum. Is there a 45 degree force from the tension in the cable on the pulley attached at the joint of the beam and column?
Thank you for any help.