EV Thermal Analysis: 1D and 3D Model Integration for Cockpit and Batteries
Presentation by Massimiliana Carello, from Beond & Politecnico di Torino.
Nowadays automotive climate control systems are evolving at a rapid pace to meet the overall vehicle requirements. System evaluation is one of the major requests currently faced by the automotive manufacturers and their suppliers. Thermal comfort, convenience and range are equally important user expectations, even if they may represent “opposed” performance for a modern EV, especially in an urban driving cycle.
In this framework, to achieve the expected targets and limiting the time-to-market and costs, a complete vehicle thermal model is to be developed to evaluate the cockpit thermal request for occupants' comfort at different ambient temperatures as well as solar radiation. Furthermore, the battery thermal management is to be investigated, to avoid cells damages and deterioration. The aim of this technical presentation is to highlight the integration capabilities of a lumped parameters model (1D) developed with Altair Activate for fast simulations and a CFD model (3D) of the battery liquid cooling system developed in AcuSolve. The Models realized are validated using experimental data.
Form Follows Function - thyssenkrupp AG - Reinventing the Elevator Concept
thyssenkrupp Elevator AG has presented the MULTI concept, the world’s first rope-free elevator. The drive is ensured by a linear electromagnetic motor. To enable an economically feasible operation, it is necessary that the total weight of the lift does not exceed a certain limit. Designing the overall system of the MULTI lift according to this weight specification is one of the major challenge for thyssenkrupp Elevator.
In this presentation, an overview of the partnership between thyssenkrupp Elevator and Altair, the chosen design partner since the early phase of development, will be introduced. Thereby, different aspects of the simulation driven design process will be highlighted, taking into account several tools throughout diverse stages of the development cycle.
Christian Kehrer presents on behalf of thyssenkrupp Elevator AG.
Aspects of Heterogeneous System Models in Industrial Applications
Presentation by Robert Höpler, Founder of SysOpt GmbH.
Heterogeneity can be present on various stages in system modelling and simulation. A system model is often called ‘multi-domain’, when different technical domains are present, such as hydraulics, mechanics, and control. When it comes to simulation this is just the surface of this domain level. Various mathematical and modelling formalisms can lie underneath which lead to different mathematical equations of motion, numerical properties, and computational complexity. On a specification level we see the choice between different modelling formalisms and modelling languages, libraries, coding styles, and authoring tools. Often there is a need to mix these. Decisions taken here strongly influence expressiveness of the models and ability for code generation and deeply impact software engineering topics such as development processes and exchange of models. Multi-domain approaches such as Modelica try to reconcile some these sources of heterogeneity. On an executional level we find classical desktop system simulation but more complex settings such as co-simulation, parallelization, real-time systems, and optimization which constrain numerical stability and precision and simulation speed. There might be an intricate feedback to the specification level, e.g., when modelling for specific solvers. Efforts like the Functional Mockup Interface (FMI) address some of these aspects and focus on interfacing and exchange of executional models. Prevalent system simulation tools are usually mature and controllable – as long as one stays within the desired scope of the tool. Following some examples we show how practical considerations influence design decisions and the choice of tooling.
Simulation of a Gas Turbine and Generator System Under Steady State and Transient Conditions using Altair Activate
Presentation by Tomas Suguinoshita Quirino, GT2 Tecnologia.
This work presents the strategy created by GT2 Tecnologia to simulate the dynamics of a system comprised by a gas turbine coupled with an electrical generator, which is a typical schema for thermoelectrical powerplants. The mathematical models of the gas turbine and the generator are based on physical principles, such as mass and energy conservation, as well as on correlations from the literature, including heat transfer coefficients and tables of thermodynamic properties. The models have been developed and tested in native languages (Fortran 90 and C++) and their integration with Altair Activate is achieved through the Custom C Block functionality. The system is first tested in Activate in a base load scenario, being then subjected to load changes. This work discusses the test results and shows the advantages of using sT Activate in the simulation of thermal and electrical phenomena.
Fast and Reliable Software Interfaces to Speed up the Design of Electric Motors
Presentation by Luigi Rizzi, Technical Director at SPIN Applicazioni Magnetiche.
The car industry is undergoing an unprecedented shift, between electrification, car sharing and autonomous drive. Car makers are going to roll out several zero-emission models in the next few years and their engineering departments are going to face new challenges. Engineering methodologies and good-design practices related to the well-known internal combustion engine must be reviewed and adapted to the electric propulsion system, considering multi-physic analyses in order to cover the various aspects of the vehicle performance. In this presentation a fast and reliable solution for the design of electric motors is shown.
A powerful software interface has been prepared in order to help the engineers to setup the model, define targets and boundary conditions, include multi-disciplinary verifications and collect analyses results. Using this tool, designers can easily and quickly perform electromagnetic analysis with the Altair software for electromagnetics, Flux, verify the performance in terms of delivered power, torque, losses and efficiency, check the thermal behaviour by means of equivalent thermal networks built in Activate and at the same time verify the stress levels and the NVH performance with OptiStruct, in order to define the early stage details of the product development. Activate plays a key role to speed-up the analysis because allows to obtain fast and accurate thermal information reducing the time usually required to simulate this domain.
Virtual Tryout - Digitalization for an Efficient Commissioning of Forming Tools
Presentation by Dr. Lars Penter, Head of Machine Technology at University of Dresden.
The life cycle of a forming tool consists of five major phases. It starts with the process and tool design followed by its assembly, the ramp-up and serial as well as spare part production. Due to every increasing system complexities, various simulation tools accompany today’s tool life cycle. A popular term in the current world of production is the “Digital twin”. It is a simulation model, which contains at least two sub-models of different physical disciplines, connects different time scales and regularly synchronizes data with the real system. Such a model must be a highly accurate white box model.The presentation will address the generation of a virtual twin on the example of the virtual try-out of forming tools. The simulation model employs RADIOSS (for forming process simulation), MotionSolve (for multi-body simulation of machine mechanics) or Activate (for more complex multi-domain modelling of mechanics, hydraulics and electrical components). Currently, the digital twin allows for computing the interactions between forming process and die cushion. This enables the calculation of correlations between die-cushion cylinder forces and flange draw-in. The presentation shows how optimizing these cylinder forces in HyperStudy benefits the final part quality and shortens real tool try-out time.
Multi-disciplinary System Simulation for Model-Based Development
Customers share their success stories illustrating how Altair Model-Based Development technology, and especially Altair Activate™, help them design better products faster. These customers give special attention to simulating multi-disciplinary performance aspects of their products as a system-of-systems. Given the complexity of today’s smart products, this often involves a combination of mechanical, electrical & electronic, and/or software aspects – and thus leverages both 1D and 3D models simulated together.
Presentations recorded at the 2018 Global ATC in Paris, France on October 18, 2018.
Transient Analysis of Switched-Reluctance Motor Drive by FE Model Co-Simulation
Presentation by Lino Di Leonardo, University of L'Aquila.
This presentation showcases an analysis technique of electric motor drive based on transient simulation tools and embedded finite element motor modeling (co-simulation). A couple of software tools, Altair Flux and Activate, are employed suitably interfaced each other. The first one allows the computation of the motor electromagnetic behavior using a finite element model, while the second one allows the dynamic simulation of the control and feeding converter. The interacting use of these tools allows a detailed prediction of the motor transient behavior under a given control strategy and drive scheme. As test case a multi-phase Switched Reluctance motor for aerospace application is considered.
The results demonstrate that the co-simulation procedure allows taking into account not negligible phenomena, such as dynamic torque ripple, usually not considered in similar studies. Hence, co-simulation analysis represents a significant step for the integrate design of the motor and control, as well as a meaningful tool for electrical drives education.
Sensorless Field Oriented Control Hardware in the Loop
Employing TI's FAST (Flux, Angle, Speed, and Torque) observer
Getting Started, Training Materials, Videos