Penalties for Late Submissions

Late submission policy

·Late submission of any item of coursework will be capped at a minimum pass mark if received up to one 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 assesses the following module Learning Outcomes (Take these from the module DMD):

This assignment aims to enhance students’ knowledge on theoretical modelling or applied computer simulation or other practical methods to analyse vehicles dynamics and vibration.  

ØApply analysis techniques to load the suspension model

ØUse 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

ØThe 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.

Penalties for late submissions

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.

Important notes:

•All students must submit their individual report through Canvas/Studynet.

•The mark will be awarded to individual within the Canvas/Studynet.

•Students must follow the requested tasks and report findings.

•Your submission may contain theoretical calculation, computer simulation or educational video/animation

•Applicable theoretical calculation or computer simulation must be reported using provided template. Please see blow document for detail information. Marks awarded for:

•The assignment contains required tasks must be reported by all students.

•Report must be completed according the instruction provided on the template.

•The marking scheme has been specified on the template of the report.  

A note to the Students:

1.For undergraduate modules, a score above 40% represent a pass performance at honours level.

2.For postgraduate modules, a score of 50% or above represents a pass mark.

3.Modules may have several components of assessment and may require a pass in all elements. For further details, please consult the relevant Module Guide or ask the Module Leader.

Task 1: Theoretical modelling

1.Perform free body diagram (FBD) for the system to satisfy the Newton’s 2nd low. Make sure to draw all applied forces on the FBDs. Please develop your assumptions to address the applied forces onto the identified mases.

2.Establish equation of motions (EOM) and solve the equations using appropriate parametric mathematical models. You may use your assumptions as used in the FBD of the system. Please make sure to address all loading scenarios applied to masses, springs, and damping elements.

3.Fine Natural Frequencies () of the system and discuss about possible answers. You may consider a steady state free vibration and ignore the damping effects to simplify the EOM found in step 2 and complete the results using individual data.

4.Drive Shape Modes and responses of the system. You may consider the assumption made in step 3. The general forms of responses need to be appropriately addressed based on individual data.

Task 2: MATLAB simulation

1.Write a MATLAB program to simulate the system shown in Figure 1 considering all components of the system. You may develop the model using your individual data.

2.Assess your MATLAB model against the mathematical model found in previous task. Comparison of the natural frequencies of the system, found using both models, is essential.

3.Use the model created in step 1 to evaluate the function of the suspension against your individual road profile.

4.Design a new suspension system by introducing new parameters which can provide smaller displacement (Xs) on the sprung mass.