The Velocity Response of a DC Motor With Load - Report Writing Engineering Assignment Help

Assignment Task:

Aims

• To model the velocity response of a DC motor with load 

• To identify and simulate non-linearities that exist within real systems 

• To create controllers for both the model and simulation of a DC motor to satisfy design constraints 

• To compare the differences between ideal models and realistic simulations of systems 

Background 

The design and implementation of a control system almost always begins with the creation of a model of the plant that is to be controlled. This is because in industry it can be difficult to be able to test, tune, and characterise the performance of a new controller on a plant. Sometimes the process of testing a new controller may pose a risk to the machinery and the operator. In some industries, it may not be feasible to create downtime in a plant – this is often the case with petrochemical and pharmaceutical plants. Because of these reasons, modelling becomes a necessary first step in the controller design process. 

There are two main approaches to modelling a system: mathematical modelling and experimental modelling. Mathematical modelling involves deriving and solving the equations of motion of a system. It can be tedious and at times impossible since it is not uncommon to have limited knowledge about our system, for example when certain plant parameters or component specifications are unknown. Under such circumstance experimental modelling techniques such as step response modelling or frequency response modelling are used. Step response modelling, or bump test modelling, involves applying a step input to a stable system to experimentally characterise its transient and steady-state responses in the time-domain. In frequency response modelling, the response of the system to a range of input frequencies is characterised. 

Figure 1 shows the system you will be modelling. It consists of a DC motor, with encoder feedback, that spins a mass. You will be using the Quanser Interactive Lab software to simulate the plant and then putting the model for the plant into MATLAB in order for you to facilitate the design and testing of various controllers to create the desired performance from the motor.

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