Calculating Internal Energy Absorbed in Truck Cab After Collision

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Discussion Overview

The discussion revolves around calculating the internal energy absorbed by the components of a truck cab following a collision, specifically in the context of a crash test as per ECE R29 regulations. The inquiry includes details about the setup, including the swing bob's specifications and the energy involved in the impact.

Discussion Character

  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant seeks assistance in calculating the internal energy absorbed by the truck cab components after a crash test, providing specific parameters such as the weight and dimensions of the swing bob, impact energy, and coefficients of friction.
  • Another participant expresses skepticism about obtaining meaningful results from the analysis of crash testing due to the complexity of multi-component systems.
  • A participant with experience in crash simulation projects offers to help but questions whether the inquiry pertains to computer simulations or hand calculations.
  • The original poster clarifies that they require hand calculations despite conducting a computer simulation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the feasibility of the calculations or the best approach to take, with some expressing doubt about the meaningfulness of the analysis while others seek specific assistance.

Contextual Notes

The discussion highlights the complexity of analyzing crash tests involving multiple components and the potential challenges in deriving accurate calculations from both theoretical and practical perspectives.

Who May Find This Useful

Individuals involved in crash testing, automotive engineering, or those interested in the dynamics of impact analysis may find this discussion relevant.

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prasadpatrudu
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How to calculate Energy absobed by the components of a Truck Cab after crash test??

Hi,

I have a question regarding the calculation of internal energy of components after collision.
In conducting the frontal impact test as per the ECE R29 regulation, a swing bob has to hit the front of the cab fixed to chassis with some force, and after that we have to calculate the energy absorbed by the components of the components of the cab. can anyone please help me out in solving this problem?? details of the above problem as follows..

weight of the swing bob = 1500 kg
dimension of the swing bob = length 2500 mm, height 800 mm, centre of gravity of swing bob should coincide with lateral axis of the CAB.
Distance from geometric centre of bob to the point of suspension = 3500 mm
impact energy given to the bob = 40 KJ
coefficient of static friction = 0.2
coefficient of dynamic friction = 0.2
as of my knowledge
Total energy = Kinetic Energy + Internal Energy(absorption energy)
as the friction energy is very small we can neglect that.
Total weight of the truck cab = 1 ton
Thank you...
 
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Doubt you'd get anything meaningful from this.

Crash testing, or any multi-component system deforming is a pain to analyze.
 


Hi Chrish,

It is crash test for a Truck Cab, which is composed of multiple components, frankly speaking I'm dealing with crash simulation projects in an MNC, can tou help in this regard??
 


prasadpatrudu said:
Hi Chrish,

It is crash test for a Truck Cab, which is composed of multiple components, frankly speaking I'm dealing with crash simulation projects in an MNC, can tou help in this regard??

So is it just a computer simulation you are doing or a full simulation including practical tests?
I thought you meant a hand calculation when I answered before.

If you are using a computer to simulate then there are others on this forum with far more knowledge than me. They will be able to help you better than I could.
 


Yes, I'm doing a computer simulation, but I need hand calculations as you thought.
Please help out in this regard.
 

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