Mechatronics

Die N ami x Shaky Solutions to Shocking Problems FACSIMILE TRANSMISSION From: Dr Rose Email: [email protected] Attention of: Murata Our Ref: xf-01-015 No of pages: 2 Dear Sirs Further to our previous conversation, please find enclosed information requested regarding the automobile specification and performance testing which should be treated as commercial in confidence and not passed on to any third party. Please quote Our Ref on all correspondence. The automobile has the following specifications: 2007 Cadillac CTS Weight, m: 1592 kg Frontal area, A: 2.581 m2 (Approximated) Drag coeff, Cd: 0.31 Wheel radius, Rw: 0.34m Torque @ engine RPM: 263.1 Nm @ 3200 Transmission efficiency, η: 80% Final Drive Ratio, FDR: 3.42 Gear ratios, G: 1st – 4.15 2nd – 2.33 3rd – 1.53 4th – 1.15 5th – 1.00 6th – 0.79 The tests to be carried out are: For Part 1 of the Project Description: Test 1: To model the performance of a car in a single gear, at arbitrary throttle settings, and also going up and down hills.

In particular, undertake the following tests (at full throttle unless otherwise indicated) : • 1st gear, time from 0 to 40 km.hr-1, level ground, also 5% uphill slope, 10% downhill slope • Top gear, time from 0 to 100 km.hr-1, level ground, also 5% uphill slope, 10% downhill slope • Top gear, % throttle to maintain 100 km.hr-1, level ground, also 5% uphill slope, 10% downhill slope • Top gear, find maximum speed level ground, also 5% uphill slope, 10% downhill slope Test 2: To model the performance of a car including gear changes.

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Time from 0 to 100 km.hr-1, level ground, using optimal gear changes Time to travel 400m (standing start), level ground, using optimal gear changes

For Part 2 of the Project Description: • As in the project description Please could you provide us with the test results (You are welcome to try additional tests and add these to you report) in full written report by 5pm 26th Feb 2007 comprises the following: 1.

A description of your mathematical model of the car, including the major assumptions about your model, and how these might affect the accuracy of the model. [15 marks]

2.

A description of your Simulink model of the car, including a block diagram of the model. In your model, describe what inputs and outputs to your system are, and how you measure results. [15 marks]

3.

An appropriately presented simulations [15 marks]

4.

A critical analysis of your results, and a discussion of most significant improvements that could be made to your model. [15 marks]

5.

Demonstration: At the laboratory session, in week 6, your company will be asked to demonstrate the operation of your simulation [30 marks]. (Precise details closer to the time)

6.

Creativity [10 marks]

Yours sincerely, XXX The Die Namix Director.

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