Air Bag Inflation Rate: Calculating Time & Stress

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    Air Inflation Rate
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SUMMARY

The discussion focuses on calculating the inflation time and stress for an exhaust-powered vehicle car jack air bag. Key equations involve converting mass flow rate to volume flow rate and applying mechanics of materials principles to assess the stresses on the air bag. Specific attention is given to the weakest points of the air bag, such as seams and walls, under the load of the vehicle. The conversation emphasizes the need for a solid understanding of fluid mechanics and material strength to accurately perform these calculations.

PREREQUISITES
  • Fluid mechanics principles, particularly mass flow and volume flow conversions
  • Mechanics of materials, focusing on stress analysis in cylindrical structures
  • Understanding of pressure dynamics in inflated materials
  • Basic knowledge of vehicle load distribution and its effects on air bag design
NEXT STEPS
  • Research fluid dynamics equations for mass flow to volume flow conversion
  • Study mechanics of materials equations relevant to pressurized cylindrical structures
  • Explore stress analysis techniques for inflatable structures under load
  • Investigate design principles for air bags in automotive applications
USEFUL FOR

Engineers and designers involved in automotive safety systems, particularly those focused on inflatable structures and fluid dynamics in vehicle applications.

faiz513
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I am designing an exhaust powered vehicle car jack air bag. I have calculated the mass flow rate and velocity of the exhaust gases leaving the vehicles exhaust pipe. I need to calculate the amount of time it will take to inflate an air bag of a particular size. What equations do I need to be using in order to calculate the rate of inflation? Also I need to calcuate the stresses the air bag will have to withstand in order to lift the vehicle. I have taken fluid mechanics but I am having trouble figuring out which equations to use.

Thanks for the help...
 
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turn mass flow into volume flow, i would think. if its a cylindar, then you need to consider the walls of the inflated material as the weakest point (or the seams, or the intake). there should be some mechanics of materials equations for a pressureized cylinlar, then superpose a force on the cylindar from the car load at a sidewall position (say r=R or x=r,y=0.z=0.5h or something). then you need to do all the principle stuff with the design
 
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