For the purpose of knowledge automation and focusing on mechatronic-hydraulic integrated equipment systems, this book starts with the principles of engineering physical systems and comprehensively introduces the knowledge automation system and implementation methods based on the industrial knowledge expression standard of Modelica. Through engineering practices in aerospace, aviation, automotive, and other fields, it presents the application of the Modelica knowledge automation technology system in such areas as physical system simulation analysis, system design and optimization, and hardware-in-the-loop simulation. For convenience, the book comes with the relevant software system – the Modelica development environment MWorks, enabling readers to fully master and experience knowledge automation methods.