Luffing Jib Load, With and Without Sheave Pulley

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Homework Help Overview

The discussion revolves around the mechanics of a DIY Luffing Jib Crane, specifically focusing on the tension in ropes under different loading conditions. Participants are examining the static load conditions and the effects of using a pulley system.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are questioning the assumptions made regarding the tension in the red rope under different scenarios (A and B) and the implications of using a pulley system. They are also exploring the roles of different components in the crane's setup.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the assumptions made about the tension in the ropes and the function of various components. Some guidance has been offered regarding the implications of the pulley system and the support provided by the guy in the setup.

Contextual Notes

There is mention of neglecting the weights of the blue rope and pulley, which may influence the analysis. Participants are also considering the implications of different loading scenarios as depicted in the referenced images (C and D).

Herbid
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Homework Statement
Problem w/ Luffing Jib Load, With and Without Sheave Pulley
Relevant Equations
F = M x a
Now I am working with a DIY Luffing Jib Crane.

Mys subcon said that:
Tension of red rope for hanging a blue box load at the tip of the boom i(A) s as the same as hanging it with pulley and tied to the motor/ground_B (System in a Static Load Condition)..
Blue Rope and Pulley weights are neglected.

I assume by the pic C and D.
241674


Can anybody give me some advicer?
 
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Herbid said:
I assume by the pic C and D.
What are you assuming by (C) and (D)?

Have you established in your mind why there is identical tension in the red cable in (A) and (B)?
 
Other questions you might consider is what is the function of the guy in A? How does it help support the weight. How is its function changed in B?
 
NascentOxygen said:
What are you assuming by (C) and (D)?

Have you established in your mind why there is identical tension in the red cable in (A) and (B)?
It is indeed in C, the tension of red Rope is bigger the in D, because the load in C is double pulled by load and ground.
CMIIW
 

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