Keywords :
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Bus suspension system, dynamic modelling, PID
control, state-space model, MATLAB /Simulink.
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Abstract :
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This paper deals with the nonlinear system of Bus
Suspension system. This paper presents identification and
modelling of bus suspension system with the disturbance. When
the suspension system is designed, a 1/4 bus model (one of the
four wheels) is used to simplify the problem to a one dimensional
spring-damper system. The open loop behaviour of the system
on the basis of time and frequency response is analyzed. State
space modelling of the device is done to analyze its state space
behaviour. A good bus suspension system should have
satisfactory road holding ability, while still providing comfort
when riding over bumps and holes in the road. When bus
experiences any road disturbance such that pot holes, cracks,
and uneven pavement, the bus body should not have large
oscillations or oscillations should dissipate quickly. The system
should have short settling time and also have the ability to
absorb all the bumping. To achieve all these objectives closed
loop system is required. To design a controller, bus suspension
system is linearized. Despite continuous advancement in control
theory, Proportional Integral Derivative (PID) controller is the
most popular technique to control any process. In this paper,
Proportional- Integral – Derivative (PID) Controller is also
designed and tuned to give the smooth response for the bus
suspension system. System performances for the desired
parameters in closed loop are investigated. The simulation and
implementation of the controllers are done using
MATLAB/SIMULINK software.
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