Vehilce simulation, matlab simulink

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Discussion Overview

The discussion revolves around developing a vehicle simulation model using MATLAB Simulink, specifically focusing on simulating a vehicle approaching a corner while decelerating. Participants explore the calculation of braking points relative to stopping distances and velocities, as well as issues related to deceleration rates.

Discussion Character

  • Technical explanation
  • Homework-related
  • Exploratory

Main Points Raised

  • One participant describes the need for a function to determine the braking point based on deceleration rates and velocity, as the simulation requires sensitivity analysis with varying parameters.
  • Another participant notes that they have resolved their initial problem but are encountering discrepancies between calculated deceleration distances and actual performance, suggesting a potential issue with the formula used for calculating deceleration rates.
  • The assumption made regarding the deceleration of the vehicle at 0.4g is questioned, with a request for confirmation on the correctness of the calculation involving the vehicle's weight.
  • A participant expresses interest in reviewing the Simulink model to provide assistance, although they express uncertainty about their ability to help.
  • There is a suggestion to use a file-sharing service for sharing the Simulink model, as participants discuss difficulties with email attachments.

Areas of Agreement / Disagreement

Participants generally agree on the need for accurate calculations in the simulation, but there are unresolved issues regarding the correctness of the deceleration formula and the discrepancies in simulation timing. The discussion remains open with multiple viewpoints on the approach to resolving these issues.

Contextual Notes

The discussion includes assumptions about the vehicle's weight and the effects of varying deceleration rates, which may not be fully defined or agreed upon. The relationship between braking points, stopping distances, and velocities is also not conclusively resolved.

Who May Find This Useful

Individuals interested in vehicle dynamics, simulation modeling, or MATLAB Simulink applications may find this discussion relevant.

tuscan440
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hi there, i am currently developing a vehilce simulation model using MATLAB simulink. The simulation requires a vehilce to be simulated traveling around a simple race track. the vehilce model itslef has already been created and have all necessary vehicle input data for the simulation. the problem i have is that i have to simulate the vehicle approaching a corner from a straight line and decelerating at first 0.4g and then 0.8g, so that it travels around the corner at 10m/s. therefore i need to have a function that will determine the braking point relative to the stopping distance, (obviously the same as the distance to corner) and relative to velocity. as i have to perform a sensitivity analysis by changing other parameters the velocity will be different each time it is run so i need the function to determine the braking point by itself. is there any funtion you knwo where i can combine these two input parameters?any help appreciated

i have also posted in the coursework sectin as i was unsure which was most app.
 
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ok this no longer seems to be a problem now as i have managed to figure it out, however my calculated deceleration distances and the formula used to calculate deceleration rates do not seem to match as the vehcile arrives at the corner at 10m/s about 2 seconds too late. i think the problem may be with the formula used for calculating deceleration rate of the vehilce. i assumed a deceleration of the vehilce at 0.4 g to be = 0.4*9.81*weight of vehilce, if you could let me kno whether this is correct it would be appreciated

cheers
 
Hey man,

Send me your simulink model. Id like to run it on MATLAB and see how it works. Maybe I can help (probably not).

-Cyrus
 
ok dude, but i can't find an attachment function in th email. i will need an email address to send it from my email account.
 
just upload it using a file share service like imageshack.
 

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