Industrial equipment and control engineering are key enablers for nearly all technological applications. Fluids handling and machine actuation are a part of life in many of the technologies we use every day.

To master such systems, the design engineer needs to understand and manage the system’s complexity. Focused on air as working media, the Pneumatics Library, which I am proudly developing at Modelon, can be an important part of the design process.

I want to introduce to you some of the models and features arriving with the spring release of the Pneumatics Library (late May) with Dymola 2017.

Meet Pneumatics Library 2.0!

Pneumatics 2.0 adds thermal effects, real gases models, and FMI-integration example

Handling thermal phenomena

Pneumatics Library 2.0 comes in May with consolidated modeling capabilities in ThermoPneumatics, a subpackage for handling air thermal phenomena based on full conservation of energy equations. ThermoPneumatics enables better accuracy for small applications with fast temperature dynamics, such as micropumps.

Fluid property models use interfaces from Modelon Base Library and support both ideal and real gases. In vacuum and in high pressure applications, the ideal gas assumptions are no longer valid. Real gases provide a wider validity domain for systems modelled with Pneumatics Library. Availability of both ideal and real gas properties helps the user to decide whether the ideal gas law is an acceptable assumption early in the design stage.

A variety of pre-defined ideal gases are available: NASA air, dry air, argon, carbon dioxide, nitrogen and oxygen. The available models eliminate countless hours of searching through old textbooks or the internet to find and implement property data.  

Pneumatics Library 1.x fluid models with constant properties are still supported. When needed, you can use the option to disable the temperature effects.

New example on pneumatic brake booster

With Pneumatics Library 2.0, we offer a completely new example model highlighting Functional Mockup Interface (FMI) capabilities. The example demonstrates a pneumatic brake booster model acting on the hydraulic brake circuit where the hydraulic system is compiled as a Functional Mockup Unit (FMU) from Hydraulics Library

Pneumatic brake booster with Hydraulics Library FMU and model
Pneumatic brake booster with Hydraulics Library FMU (top) and with Hydraulics Library model (bottom)

Improved documentation

Pneumatics 2.0 also brings improved documentation. All components have relevant and structured documentation, enabling for example the user to see which physical equations the component is using.

A completely new User's Guide is now available with well documented example models. This ensures that new users can get started quicker.

Find out more

More information and release notes are available on our Pneumatic Library product webpage

If you want to learn more, fill in your email below.

Jim Claesson  has an MSc in Mechanical Engineering from Lund University. Jim is a modelling and simulation consultant at Modelon, engaged with both thermofluid and mechanical systems. He is also the project manager for the development and support of two Modelica Libraries: Hydraulics and Pneumatics. In his free time Jim competes in road racing with motorcycles among the top riders in Sweden.