7AAD0054 Automotive Dynamics and Safety
Penalties for Late Submissions
• Late submission of any item of coursework will be capped at a minimum pass mark if received up toone week late. Any submission received more than one week late will be awarded a mark of zero.
• Late submission of referred coursework will automatically be awarded a mark of zero.
• Note: The School operates a strict policy on late submission. Canvas/Studynet marks all work submitted late, even by one second, as Late, in which case the above late penalties will be applied. Where genuine serious adverse circumstances apply, you may apply for an extension to the hand-in date, provided the extension is requested a reasonable period in advance of the deadline. However, you are warned that lateness due to network congestion (either at the University or on your local network), difficulty with filenames, poor time management and similar issues will not be considered as admissible circumstances. For this reason, you are advised to submit at least one hour before the deadline.
This assignment aims to enhance students’ knowledge on theoretical modelling or applied computersimulation or other practical methods to analyse vehicles dynamics and vibration. The successful student will be able to:
➢ Apply analysis techniques to load the suspension model
➢ Use applicable method to model quarter car model with an aim to understand:
• A method of characterizing the Newton laws for modelling oscillating behaviour
• A theoretical approach to establish calculation of a 2 degree of freedom system
• The impact of the modelling choices to the accuracy of results under different loading conditions
• Understands subtle different approaches to model a vibrating system
• How these findings can be used to improve the actual suspension system
➢ The assignment will reinforce a student to:
• Analyse oscillating structural events such as amplitude, frequencies and shape modes.
• Practice the structural behaviour under different modal assumptions (boundary conditions, load combinations)
• Understand how loads can develop through an assembled suspension.
• Be able to compare theoretical outputs to possible computer models.
• Appreciate how the simulation approach can be used to predict the structural performance.
For the purposes of this assignment you have been tasked with simulating a simplified model of a quarter car suspension. You are encouraged to consider the identified loading scenarios and complete the tasks of this assignment. You may develop your own assumptions under your identified loading/displacement scenarios and provide a clear evaluation on the oscillating system when experiencing road conditions. Your defined assumptions should be based on a clear loading and boundary condition you may use to assess these solutions. These should lead you to develop your own model and validate it against other methods if applicable.
Please provide a report with your assumptions, calculations, solutions and observations as follows:
• Your assumptions in terms of design, requirements and measurables
• State clearly your requirements and limitations
• Justify your model choices and calculate their influence on its performance
• Explain the findings and discuss about possible weaknesses / strengths of the method
• Highlight design recommendations which can improve the function of the design.
Perform free body diagram (FBD) for the system to satisfy the Newton’s 2nd low. Please develop your own assumptions to address the applied forces onto the identified mases.
• Find the equation of motions and response of the system to oscillations. You may use your own assumptions as used in the FBD of the system. Please make sure to address loading scenarios applied to masses, springs and damping elements.