How do I solve a 3D problem involving a trailer and wheel sizing using statics?

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Discussion Overview

The discussion revolves around solving a 3D statics problem related to a three-wheel trailer and the sizing of its wheels. Participants explore how to analyze the load distribution on the trailer and the forces acting on the wheels, particularly focusing on the support provided by the axles and the overall load of 3500 kg (approximately 35 kN).

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about breaking down the problem using statics, specifically regarding the load on wheel B and the lack of support for it.
  • Another participant suggests summing the moments about a point and ensuring that all forces acting on the trailer equal zero, indicating that equations can be formed to solve for unknowns.
  • Questions arise about the status of the rear axle (A) in the diagram, with some participants seeking clarification on whether it should be treated the same as wheel A in a section view.
  • There is a suggestion that the section is supported at the point where wheel A is located, proposing a conceptual approach of collapsing the rectangular plate to a single line representing the total load.
  • A later reply expresses understanding of the concept after the clarification, indicating a potential resolution for that participant.

Areas of Agreement / Disagreement

Participants express differing views on the treatment of the rear axle and its relationship to the wheels, indicating that multiple competing perspectives remain. The discussion does not reach a consensus on the best approach to the problem.

Contextual Notes

There are unresolved aspects regarding the assumptions made about the load distribution and the specific geometry of the trailer, which may affect the analysis. The discussion also relies on the interpretation of the diagram provided by the original poster.

Mechaman
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Hi all, I have a problem with a 3 wheel trailer and sizing the wheels. Using statics, how would I solve this 3D problem by breaking it down?

The trailer is sitting on rectangular section and a plate on top carries an even load of 3500kg (roughly 35kN)

If I take a cross section A-A and try and find the load wheel B is under, there is nothing to support it. I'm not sure how I would approach this problem?

Problem attached: https://imgur.com/Pf0tfKH
 
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Since it is static, you can sum the moments about a particular point equal to zero. Then all forces acting on the trailer must sum to zero. You will have some equations to solve for the different unknowns.
 
What happened to the rear axle (A) on the bottom diagram?
 
scottdave said:
What happened to the rear axle (A) on the bottom diagram?
Would the axle be considered the same as wheel A when looking at it in section view?
 
Yes, that section is supported at point where wheel A is. Think along the same lines as you being able to collapse the entire rectangular plate down to a single line with the 35 kN.
 
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scottdave said:
Yes, that section is supported at point where wheel A is. Think along the same lines as you being able to collapse the entire rectangular plate down to a single line with the 35 kN.
Great I think I understand now. Thanks for the help.
 
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