vehicle model in simulink in matlab

Vehicle Modeling in Simulink

Simulink is a powerful tool for modeling and simulating dynamic systems. Vehicle modeling in Simulink involves building a mathematical model that represents the motion of the vehicle under different conditions.

One of the key components of a vehicle model is the suspension system, which is responsible for maintaining the contact between the tires and the road surface. A well-designed suspension system provides good handling, stability, and ride comfort.

Here is an example of how to model a simple vehicle dynamics system in Simulink:


main.m
% Define vehicle parameters
m = 1000;       % mass of vehicle (kg)
Cf = 16000;     % front tire lateral stiffness (N/rad)
Cr = 18000;     % rear tire lateral stiffness (N/rad)
Lf = 1.5;       % distance from COG to front axle (m)
Lr = 1.5;       % distance from COG to rear axle (m)
Iz = 2000;      % yaw moment of inertia (kg*m^2)
Vx = 20;        % vehicle velocity (m/s)

% Create Simulink model
model = 'vehicle_dynamics';
open_system(model);
set_param(model, 'StopTime', '10');

% Add vehicle dynamics block
add_block('simulink/Continuous/Transfer Fcn', [model '/Vehicle Dynamics']);
set_param([model '/Vehicle Dynamics'], 'Denominator', '[(m*Vx) (Cf*Lf + Cr*Lr) (Cf*Lf^2 + Cr*Lr^2 + Iz)]', 'Numerator', '[Cf*Lf -(Cf*Lf^2 + Cr*Lr^2)*Vx 0]');

% Add integrator block for lateral velocity
add_block('simulink/Continuous/Integrator', [model '/Integrator']);
set_param([model '/Integrator'], 'InitialCondition', '0');

% Connect blocks
add_line(model, 'Vehicle Dynamics/1', 'Integrator/1');

% Add scope block
add_block('simulink/Sinks/Scope', [model '/Scope']);
set_param([model '/Scope'], 'Position', [500 100 700 300]);

% Connect blocks to scope
add_line(model, 'Integrator/1', 'Scope/1');
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In this example, we define the vehicle parameters and then create a Simulink model. We then add a transfer function block to model the vehicle dynamics, an integrator block to compute the lateral velocity, and a scope block to visualize the results.

By running this simulation, we can see how the lateral velocity of the vehicle changes over time, and how it is affected by different parameters such as the tire stiffness, the distance between the axles, and the velocity of the vehicle.

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