Week-11 Challenge: Braking

For a defined driving cycle, calculate the energy required for braking. The Highway Fuel Economy Test (HWFET or HFET) cycle is a chassis dynamometer driving schedule developed by the US EPA for the determination of fuel economy of light duty vehicles is considered for calculation of total braking energy.   The…

Q1. Run MATLAB demo ‘Speed control of a DC motor using BJT H-bridge’. Modify the model such that armature current doesn’t shoot up when motor changes direction from forward to reverse. Reference: https://in.mathworks.com/help/physmod/sps/examples/speed-control-of-a-dc-motor-using-bjt-h-bridge.html…

1.   Which types of power converter circuits are employed in electric and hybrid electric vehicle?      2. An Electric Vehicle's Drivetrain with 72V battery pack in shown in the diagram below. The duty ratio for acceleration operation is 'd1' and for the braking operation the duty ratio…

Q1. What is the difference between mapped and dynamic model of engine, motor and generator? How can you change model type?    The powertrain blockset provides two types of propulsion models 1. Mapped Model  uses a set of steady-state 2-d lookup tables to characterize engine/motor performance. The…

 Q1. For EV_defaults_in file, if cargo mass is 500 kg with all other default conditions, can the vehicle travel for 45 km with FTP drive cycle? Conclude your observations. On the advisor tool input page, from the load file dialog box, the EV_defaults_in vehicle model is loaded. The payload mass is increased to 500kg…

Objective: Calculate forces acting on a vehicle.    Q1. What should be the maximum speed of the motor used in an electric scooter capable to run at 90 kmph, if the fixed gear ratio is 7 and tire size is 90/100 R10 53J ? Given Inputs: Gear ratio G = 7 Speed = 90kmph = 25m/s Tyre spec = 90/100 R10 53J Rim radius…

Project Objective: To read and extract the given THERMO.dat file containing NASA determined coefficient for various species. To write a function to calculate the specific heat, entropy and enthalpy for various temperature ranges for each species. To calculate the molecular weight of each species.  To plot the specific…

Objective 1. To write a MATLAB code to optimize a stalgamite mathematical model 2. To find the global maxima of the following model using Genetic Algorithm.  Generic algorithm: Genetic Algorithm is optimization method based on the mechanics of natural genetics and natural selection. Genetic Algorithm mimics the principle…

Objective: To simulate the motion of a pendulum using MATLAB by solving the equations of motion given by second order ODE\'s.  Code:  clear all close all clc b=0.05; % damping coefficient g=9.81; l=1; % length of pendulum m=1 % mass of pendulum %initial conditions init_cond= [0;3]; %time duration t_span = linspace(0,30,1000);…

Introduction: Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. Objective: To perform a combustion simulation  on the combustor model and to plot the mass fraction of different…

 Overview The scope of this project is to perform a two dimensional simulation of slosh dynamics within a gearbox, consisting of two rotating spur gears. Such simulations are often performed in the industry to determine if all the gear teeth are getting lubricated adequately over a certain number of rotations. In…

Introduction: A cyclonic separation is a method of removing particulates from an air, gas or liquid stream, without the use of filters, through vortex separation. When removing particulate matter from liquid, a hydrocyclone is used; while from gas, a gas cyclone is used. They work on the principle of inertia to filter…

Objective: To run a parametric study of a gate valve in a pipe. We will be studying five different opening conditions of the gate valve and the corresponding mass flow rates at the outlet of the pipe.  Introduction: A gate valve is generally used to completely shut off fluid flow or, in the fully open position,…

Q.1 Practical CFD models that have been based on the mathematical analysis of Rayleigh Taylor waves: 1. K-L turbulence model for the self-similar growth of the Rayleigh-Taylor and Richtmyer-Meshkov instabilities. K-epsilon (k-ε) turbulence model is the most common model used in Computational Fluid Dynamics (CFD)…

Objective: The main aim of this analysis is to perform a CHT Analysis of a graphic card to determine the maximum temperature attained by the processor and study heat transfer coefficients and temperature distribuation across the model.  Geometry Setup: In real world conditions, a PCB board is enclosed inside the CPU…

Introduction: Conjugate heat transfer (CHT) allows the simulation of the heat transfer between Solid and Fluid domains by exchanging thermal energy at the interfaces between them. Typical applications of this analysis type is the simulation of heat exchangers, cooling of electronic equipment, and general-purpose cooling…

Introduction :  The Ahmed body represents a simplified, ground vehicle geometry of a bluff body type. Its shape is simple enough to allow for accurate flow simulation but retains some important practical features relevant to automobile bodies. This model describes how to calculate the turbulent flow field around a…

  Objective: We want to simulate the unsteady flow over a 2d cylinder at Reynolds number (Re=100). We are interested in capturing the time periodic vortex shedding behind the cylinder and also estimate its frequency. Computational domain: A 2d planar faced geometry was created to represent the cylinder inside a computational…

Objective: To perform meshing on a cylinder model using ANSA. Geometry: The first step is to import the given geometry file into ANSA. After the model is imported did a check on the presentation parameters to make sure CONS are enabled in PID mode. The next step is to make sure properties are assigned to the boundary faces…

Objective: The aim of this project is to simulate heat transfer in a T joint pipe and study the mixing effectiveness of the fluid through the pipe. This is achieved by studying the temperature at the outlet for varying pipe lengths and ratios of cold inlet velocity to the hot inlet velocity (momentum ratio).  Geometry:…