Reference no: EM133529896
DMS Time-Limited Assessment
Case Scenario
For this part of the Assessment, you are provided with the same context and application as for Project Week 2: the Last-Mile-Delivery vehicle prototype.
Introduction
With the growth in e-commerce and online shopping, it is important that the logistics chain of delivering packages is as efficient and cost-effective as possible. A core element of this chain is the last leg of an item's journey and is costly due to the scattered nature of delivery locations. It is argued that autonomous electric vehicles, such as the concept shown in Figure 1, could be a solution to increase the cost-effectiveness and reduce carbon emissions associated with 'Last-Mile-Delivery' (LMD).
It is assumed that the vehicle travels in a straight line and the wheels/tyres do not slip with respect to the ground.
In Project Week 2, your task was to build a MATLAB model that can be used by the manufacturer of the vehicle to optimise various parameters that can impact the performance and efficiency of the vehicle.
For this assessment, you are now required to perform this optimisation, using MATLAB. Provided to you is a Function File that models the driving strategy (following the flow chart from Project Week 2). The function takes, as an input, several vehicle parameters, and returns the percentage of time the motor is providing forward motion, given by:
% time on = time on/total time x 100%
Note
- % time is a number between 0 and 100.
- You DO NOT have to replicate the model building task from Project Week 2. This has been done for you by the function.
- As before, the assumption is that the energy use is directly proportional to the time in use. As such, the clear goal of this optimisation is to minimise the percentage of time the motor is engaged.
The function is called pngfunc. To call the function, you use the following command: >> pcttime = pngfunc (Cd, Af , Crr, mveh, vlow, vhigh, Tm, GR) Where:
pcttime Percentage time on (0-100%) vlow Lower velocity threshold (m/s)
Cd Coefficient of Aerodynamic Drag vhigh Upper velocity threshold (m/s)