INTRODUCTION: -
the suspension system in the car is provided to
absorb the shocks in the vehicle and prevent any damage in the components of
automobile by these shocks. It helps to make the ride comfortable to the
occupant. It is an important mechanism to control the dynamic aspects of the
automobile and make its control easy and stable.
In the mechanism of suspension system of a
vehicle, the components efficiency of the vehicles is an important factor.
Basically the mechanism is about keeping the car frame and car wheels apart
from each other. For good suspension the dynamics control is necessary. For
this purpose all the three movement i.e. pitching, rolling and yawing should be
consideration while designing a suspension system. These three movements occur
in the three axes of vehicle.
As in this project we want to design an
active suspension system and then simulate it on a testing or simulation
software, so we will study about the necessary parameters and information to
design such system.
NEED OF THE PROJECT:-
Now
a days new technologies are coming day by day and the wold is moving very fast.
New methods has been developed for suspension as well. But we are trying to get
an efficient system which complies with almost all aspects related with economy
and efficiency.
The most use method of suspension is called
passive suspension. It can also be said as a conventional method of suspension.
In the passive suspension the springs are used. The stiffness of spring and
dumping are the parameters to be considered.
Another method which is advance to this is
active suspension method. But this method is quite expansive as it needs a
separate energy source in the suspension system which makes it less economical.
That is why we need a suspension system that have the properties of being
efficient and economical at the same time.
The
semi active suspension system is able to fulfill these requirements. In the semi
active suspension system properties of both passive suspension and active
suspension system is utilized.
Process of performing the tests and
reaching to a result of project-
·
This is a project about
developing an active suspension system of an automobile.
·
In a car model two input
parameters are considered i.e. damper rate and stiffness of spring.
·
For the study of nature of
these parameters the experiments are performed, for the experiment one parameter
is set constant and other is kept variable.
·
One by one both the parameters
are examined by keeping both the parameters as constant and variable for once.
·
As the higher damper rate is
responsible for better suspension system, so to measure the maximum result the
damper rate is kept at its peak value and stiffness of spring is maintained to
the minimum value.
·
These test are simulated in a simulation or
testing software such as Mat lab or Ansys etc.
VARIOUS ELEMENTS IN THE PROCESS OF SIMULATION
1. SEMI ACTIVE SUSPENSION SYSTEM: -
The controlled action of suspension is
referred as active or semi active suspension system. In the semi-active
suspension system various devices are used for advancement such as air spring,
hydraulic suspension devices, self-levelling devices etc. the semi active
suspension can be improved by using more control systems. At the time of design
or when incorporating new system the factors like weight, size, cost, material
etc. should be considered.
In the semi active suspension system a
special technology magneto-Rheological dampers (MR dampers) are used. These
dampers are used in commercial vehicle as well as in locomotives. It makes the
design of actuator precise and simple.
3. CONTROL SYSTEM USED IN SEMI ACTIVE SUSPENSION SYSTEM:-
Control system is the main element of any
suspension system to make it an advance system. In a passive suspension system,
the automated control system will be added to make it an active suspension
system. This is basically the combination of devices whose function is to
manage, adjust or control the other system. To build a control system logical control,
sequential series, algorithms are used such as on-off systems, logic gates
systems, feedback system etc.
2. SIMULATION AND TESTING: -
The simulation of the system is performed in
attesting software such as Matlab. For which a model of the suspension is
developed in a modeling software. During the modeling of system appropriate
blocks should be used to simulate he suspension for different types of system.
For the testing of this system a road track
is also designed in which lot of irregularities and turbulences
are introduced for better testing.
In the testing or study of behavior of
semi active suspension system, the two important parameters are studied. Damper
rate and stiffness of spring. DAMPER is the element which act as a shock
absorbent in suspension system. And damper rate is the measure in the spring of
the oscillation to be diminished after a disturbance is created. Stiffness is
described as the resistance to deflection in the spring. So these two
parameters are to be studied with reference to each other. For the calculation,
one of these parameters is kept at a constant value and the behavior of other
is measured. Then the second value is kept constant and the behavior of first
is examined. A graphical representation and study should be done for better
understanding of the results.
CONCLUSION: -
At the end of the project the
feasibility study is done. And the result is defined that whether the system I
feasible to adopt or not. The confirmation is done between the simulation
result and the result found by experiments. The capacity of dampers will be
defined for successful implementation. And material to be used is determined
for appropriate stiffness. More researches are going on to make the system more
reliable, more comfortable and economical.
No comments:
Post a Comment