Articles for the Japanese Modelica Conference available online

Check out the full texts!

Finalized recently, the first Japanese Modelica Conference has registered a significant success! Main organizer of the event, Modelon is pleased to report on a substantial interest raised by the Conference in Japan and Asia -- the event has been sold out long before the last day of registration.

Modelica Association Board Member Hubertus Tummescheit declared about the event: “The success of the conference is well beyond expectation. This great interest in Modelica shows the need to regularly organize conferences like this worldwide."

Covering six various industrial sessions – from mechanical to thermal and to real time applications, all 18 accepted presentations are now available online. Feel free to browse them!

Modelon has been present with four contributions, all being results of collaboration projects with industry, such as: Toyota, Nissan, Hanon and Daimler.

Below short highlights for the four Modelon’s articles:

Virtual Vehicle Kinematics and Compliance Test Rig for Kinematics
Authors: Peter Sundström, Maria Henningsson, Johan Andreasson (Modelon), Xabier Carrera Akutain, Alejandro Ocariz (Toyota Europe), Hiroo Iida, Naoki Aikawa, Yutaka Hirano (Toyota)

This paper presents a virtual kinematics & compliance (K&C) test rig, also known as a Suspension Parameter Measurement Machine, SPMM. The focus is to explain the requirements and implementation of the rig model is built to be a virtual equivalent to the physical test rig, capable of reading the same input and producing the same output. The virtual test rig is implemented as a Modelica model that is plug compatible with any vehicle model using the standard interface from the Modelica Vehicle Dynamics Library. The operation of the virtual test rig is done from a scripting environment that executes a co-simulation FMU. An example test case is also shown where results from a virtual test is compared with the corresponding run on the physical test rig.

Deployment of high-fidelity vehicle models for accurate real-time simulation
Authors: Johan Andreasson, John Griffin, Peter Sundström (Modelon), Naoya Machida, Masashi Tsushima (Nissan)

In the effort to shorten development cycles and with the reduced ability to test in real life, driver-in-the-loop simulators are increasingly used by automotive OEMs and in Motorsports to enable engineers and drivers to experience a new vehicle design in a realis-tic environment before it is built. With the right level of accuracy, the same model can be applied in other real-time vehicle dynamics applications to allow for testing and verification in the development of new vehicle functions. This paper gives and overview of the requirements for automotive real-time application and the solution chosen. Emphasis is given on the model definition and real-time configuration as well as parameterization from existing data sources and integration of third party subsystem models.

Rankine Cycles, Modeling and Control
Authors: Ylva Teleman (Lund University), Pieter Dermont (Modelon), Hak Jun Kim, Kil Sang Jang (Hanon Systems)

As the need for increased energy efficiency grows, the use of new energy sources is a topic of investigation for research and industrial applications. The ability to use low temperature heat sources via a Rankine or organic Rankine cycle is one of the options. In this paper such a cycle is modeled and simulated using a Modelica based thermal management library suite as well as the simulation tool Dymola. Experimental test bench data provided by Hanon Systems allowed calibration and verification of the simulation results. Simulation results shows good agreement with experimental data. Additional dynamic simulations are performed to illustrate potential applications of the model for system optimization and control development.

Advances of Zero Flow Simulation of Air Conditioning Systems using Modelica
Authors: Pieter Dermont, Johan Windahl, Katrin Prölss (Modelon), Dirk Limperich (Daimler AG), Carsten Kübler (TWT GmbH)

This paper describes recent advances in simulation of zero flow conditions based on work with Daimler using the Air Conditioning Library from Modelon. The Air Conditioning Library is based on the open standard modelling language Modelica. Simulating refrigerant loops at (near) zero flow for large vapor compression cycles is challenging, due to the fast dynamics in the model under those conditions that drastically reduce the step size of the solver. Findings on solver selection and pressure drop correlations are presented. An approach to improve zero flow simulation based on a systematic analysis of heat transfer coefficients is suggested and demonstrated to increase simulation robustness under (near) zero flow conditions.

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by Adina Tunér