Ebook Computer Aided Design Of Mechatronic Systems
UML (unified modelling language) is widely used in designing complex andreliable computer science. In mechatronics it provides means for capturing system requirements and for the visual modelling and design of systems on a high level of abstraction. Modelica is a freely available language for object oriented physical modelling. It may be used for modelling and prototyping a medium level of abstraction, as described in Sections 4 and 5.
Information transfer plays an important role in the operation of mechatronic systems. This can be easily presented on UML diagrams. The terminology and notation of visual modelling with UML can be adopted as a common high-level object oriented language for the design of mechatronic systems and as a documentation tool in every design phase (Mrozek, 2002b; Mrozek, 2002c; Mrozek, 2002a). An advantage of UML over other tools is that it reveals gaps and inconsistencies in the specification of requirements, at very early stages of the design. UML provides the ease of modelling, understanding and modification of graphical diagrams of mechatronic systems. It integrates the best practices of object oriented development.
Designers may transfer already defined subsystems and other elements between different UML diagrams and reuse them. This accelerates the work progress and helps to keep all parts of the project in a consistent manner (Booch et al., 1999; Bruegge and Dutoit, 1999; Douglas, 1998b; Douglas, 1998a; OMG, 2003). UML is supported by all major CASE (computer aided system engineering) tool vendors. Using UML notation, an experienced developer may design systems with fewer defects and quicker.
The shorter design process (the time from the idea to the market) and better product quality provides a distinct competitive advantage. This is important, as a successful company should react quickly to changing demands of the market.
Many companies switch from paper blueprints to a digital representation of future products. Successful examples include some modern cars and the Boeing 777 plane (Sinha et al., 2000). A weak point of the computer aided design process is the lack of widely accepted, integrated multidisciplinary software and hardware environments for successful design, testing, prototyping, implementation and validation. Instead, a sequential design approach is traditionally used: mechanical design at the beginning, then the system is extended with sensors, actuators and non-mechanical subsystems. They are integrated during modelling, simulation and the prototyping phase, when the control system is designed and tuned (Gawrysiak, 2002; Uhl et al., 1999).
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