Vehicle Dynamics - ISO Road classification & Road Profile using MATLAB

AIM: To create a double wishbone front suspension assembly using different subsystems.   OBJECTIVE: Create a double wishbone front suspension assembly using the procedure demonstrated in the session.   PROCEDURE:  1. First open the 'MDI_FRONT_STEERING' from the subsystems. Save this subsystem in the…

AIM: To select roll bar and prepare an understeer budget sheet for a light weight sporty vehicle.   OBJECTIVES: 1. Select roll bar diameters to meet target roll gradient2. Select kinematic and compliance parameters to meet target understeer gradient   GIVEN DATA:   TARGETS & CONSTRAINTS:   SOLUTION:…

AIM: To study and simulate the 4WS model for steady state.   OBJECTIVES:  1. Derive the `delta_f/delta_r` formula for zero side slip  2. Plot the ratio against forward speed  3. Conclusions from the plot    SOLUTION: I. Derivation for `delta_f/delta_r` formula for zero side slip: The…

AIM: To solve given conceptual numerical question based on 'Transient Handling': Question- The following table contains information about two vehicles    OBJECTIVES: 1. Calculate the following parameters for both using formulas   1. Undamped natural frequency (Hz)    2. Damping ratio …

AIM: To Select springs and anti-roll bars, and set up swing arm geometry to meet targets for ride frequency, roll gradient and pitch gradient, for a 4WD Sedan car.   OBJECTIVES: Deliver the following- 1. Spring rates (front and rear)2. Roll bar diameters (front and rear)3. Rear ride frequency and flat ride plot…

AIM: To solve the given conceptual numerical question based on 'Vehicle Handling' Queston- A car has a weight of 1900 lb front axle and 1552 lb on the rear with a wheelbase of 100.6 inches. The tires have the following cornering stiffness values   OBJECTIVES: Determine the following- 1. Ackermann steer angles…

AIM: To solve the given conceptual numerical question based on 'Quarter Car Model'- Question:- The sprung parts of a passenger car weigh 11.12 kN (2500 Ib) and the unsprung parts weight 890 N (200 lb). The combined stiffness of the suspension springs is 45.53 kN/m (260 lb/in.) and that of the tires is 525.35 kN/m…

AIM: To solve the given conceptual numerical based on 'Half Car Model'- Question: Owing to the wide separation of the natural frequency of the sprung parts from that of the unsprung parts, the bounce and pitch motions of the vehicle body and the wheel motions exist almost independently. The sprung parts of a vehicle…

AIM: To solve the given conceptual numerical question based on "Ride Modelling'- Question: An independent front suspension of a passenger car carries a mass (sprung mass) of 454.5 kg (or an equivalent weight of 1000 Ib). The suspension spring rate is 22 kN/m (125 lb/in.). The mass of the tire wheel assembly (unsprung…

AIM: Determination of road quality using ISO road classification.   OBJECTIVES: To deliver the following- 1. Plot showing ISO classification for roads A through H (Use higher end of range for degree of roughness)  2. Plot showing the PSD profile 3. Overlay of PSD profile on ISO classification and determination…

AIM: To study- 1. The effect of different slip angles on force(Fx and Fy) v/s slip ratio relationship 2. The effect of different slip rations on force(Fx and Fy) v/s slip angle relationship   OBJECTIVES: Deliver the following- 1. Plot (use sub-plots) showing the effect of different slip ratios on lateral force vs…

AIM: To perform curve fitting on Pacejka Magic formula.   OBJECTIVES: 1. To obtain fit coefficients so that the curve describes the tire test data accurately. 2. To obtain fit coefficients so that your curve describes the tire test data accurately (it should be less than 2.0Nm)   GIVEN DATA: data file…

AIM: To write a MATLAB code for plotting the combined slip tire model.   OBJECTIVES: To plot a graph showing effect of different slip angles on Lateral Force v/s Longitudinal Force relationship.   GIVEN DATA:   GOVERNING EQUATIONS: In combined slip model, the tire is under both the lateral and longitudinal…

AIM: To plot the following graphs based on given inputs using MATLAB i) Lateral Force v/s Slip Angle ii) Aligning Momennt v/s Slip Angle   OBJECTIVE: To write a error-less MATLAB code for plotting the required graphs   GIVEN:  1. Normal load, `F_z = 5000N` 2. Coefficient of friction, `mu = 0.9` 3. Length…

AIM: To calculate required parameters for Anti-roll bar optimization   OBJECTIVES: Calculate the following parameters: (i) Roll moment (ft-lb/g) (ii) Roll gradient (deg/g) (iii) Load transfer due to roll or elastic component (lb/g) (iv) Front roll stiffness (ft-lb/deg) at wheel center level  (v) Front anti-roll…

AIM: To calculate the required parameters for anti-characteristics and to ensure a zero pitch(theorotically).   OBJECTIVES: 1. Calculate the following parameters Front end deflection under load. Rear end deflection under load. Pitch angle. Pitch gradient. 2. Use the IC location information to calculate the following…

AIM: To calculate the natural frequencies of the vehicle at different conditions and optimize the bump oscillation profile. OBJECTIVE: 1. Calculate the following parameters. Use the same front and rear spring rates for all three load conditions.The front sprung mass natural frequency target at half load is 1.15 Hz.…

AIM: To calculate the required parameters for front and rear suspension and to write a MATLAB code to plot the Force v/s Velocity shock curve.   OBJECTIVES: 1. Calculate the following parameters for front and rear suspension. (i) Sprung mass critical damping (ii) Unsprung mass critical damping (iii) Sprung mass…

AIM: To write a MATLAB code for simulating a RANKINE CYCLE   OBJECTIVES: Create a code to simulate a Rankine Cycle, the code should calculate the state points based on user inputs. Using the ‘XSteam.m’ function, which is the standard XSteam library for steam table data of water, to determine the required…

AIM: To write a MATLAB code that reads the data from a given text data file and perform the given objectives.   OBJECTIVES: Write a function that extracts the 14 co-efficients and calculates the enthalpy, entropy and specific heats for all the species in the data file.  Calculate the molecular weight of each…

AIM:  Write a program in MATLAB to simulate the forward kinematics of a 2R Robotic Arm OBJECTIVE: To create a movie visualizing the movements of a 2R robotic arm in 2D graph INTRODUCTION: Robotic Arms are machines which look like and moves very similar to a human arm, but these robotic arms can move in all directions…

AIM: Write a MATLAB program to calculate drag force against a cyclist.   GOVERNING EQUATION: Drag Force: Drag Force or Drag is a resisting force experienced by a body moving with some velocity in fluid (ex: Water or Air). The drag force is exerted by the fluid on the body in the opposite direction of motion of the…

AIM: To perform curve fitting operations on the given dataset using MATLAB.   OBJECTIVES: Write code to fit a linear and cubic polynomial for the Cp data.  Plot the linear and cubic fit curves along with the raw data points. Title and axes labels are a must, legends could be shown if necessary. Write a code to…

AIM: Write a program in MatlabOctave that will simulate the pendulum motion   OBJECTIVE: Simulate the motion between 0-20 sec, for angular displacement=0, angular velocity=3 rad/sec at time t=0s.   GOVERNING EQUATION: The differential equation for motion of a pendulum is given by:   Where, b = damping coefficient…

AIM: To understand the concept of Genetic Algorithm and to write a MATLAB code to Optimize the Stalagmite Function.   OBJECTIVES: Write a code in MATLAB to optimise the stalagmite function and find the global maxima of the function. Clearly explain the concept of genetic algorithm in your own words and also…

AIM: Write a code that can solve an otto cycle and make plots for it. OBJECTIVES:  1. Create a PV diagram. Output the ‘thermal efficiency’ of the engine. THEORY: Otto cycle: Otto cycle is a thermodynamic cycle most commonly found in automobile engines. The cycle describes the functioning of a typical ‘Spark…