Chapter two: Modelling and Behaviour
This chapter is on the theme of linear models, for example:
A d³x/dt³ + B d²x/dt² + C dx/dt + D x = K u
Where x(t) is the state, u(t) the input and A, B, C, D, K are model parameters.
This section focuses on linearisation of nonlinear models. These tutorials focus on principles.
How do I model core engineering components?
Are there analogies between different components?
Are there analogies between similar arrangements of different components?
How do I build simple dynamic models for different arrangements of components?
How do dynamic models/systems behave and how does this behaviour link to the choice of components?
Largely, these tutorials are limited to first and second order modelling and dynamics, but the principles are easily extended.
Concepts and components
Using units in modelling (PDF, 581KB)
Modelling resistor circuits (PDF, 656KB)
Analogies between resistor and spring arrangements (PDF, 541KB)
Systems with mechanical and fluid components (PDF, 804KB)
First and second order modelling and analogies
Mixture of PDF files and videos.
Tutorial sheet on first order modelling (PDF, 925KB)
Tutorial sheet on second order modelling (PDF, 319KB)
First order responses
There are overlaps in some of the later tutorial sheets so you could do a sample from each.
Introductory questions (PDF, 234KB)
Using Laplace (PDF, 156KB)
Application and context questions (PDF, 252KB)
Parameter dependence question (PDF, 237KB)
Challenging questions eg exam level (PDF, 255KB)
Talk through video tutorials on YouTube for first order systems
Second order responses
What behaviours do we get from second order models and how do we exploit these for modelling and design?
Tutorial sheet on second order responses (PDF, 319KB)
Generic system behaviours
How do we characterise behaviours in general and for high order systems? Concepts of LHP and RHP.
Non-linear models and linearisation
A number of questions on the linearisation of models which include non-linear functions.
Tutorial sheet on linearisation (PDF, 339KB)