Engineering up to the physical limits - Enabled by Multi-Target-Multi-Domain-Optimization
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1 presented at the 14th Weimar Optimization and Stochastic Days 2017 Source: A joint company of Daimler and Bosch Engineering up to the physical limits - Enabled by Multi-Target-Multi-Domain-Optimization Marc Brück Weimar, June 2 nd, 2017 EM-motive GmbH / DBEM/EEP4-Brück / slide 1
2 Table of contents EM-motive GmbH Customer requirements / engineering constraints Component vs. systems engineering Workflow Example 1: Noise due to electromagnetic forces Example 2: Impact of scattering input parameters Evaluation of performance at a glance New postprocessing features in optislang Summary EM-motive GmbH / DBEM/EEP4-Brück / slide 2
3 EM-motive GmbH A joint company of Daimler & Bosch More than e-motors manufactured since 2012 Full-range portfolio for EVs, plugin-hybrids and hybrids Customer vehicles with EM-motive e-motor EM-motive GmbH / DBEM/EEP4-Brück / slide 3
4 Customer requirements / engineering constraints Customer requirements touch different physical domains coolant flow-rate coolant temperature environment temperatures winding temperatures magnet temperatures tbc NVH thermal cost mechanical electrical mounting space torque power speed tolerances to other parts forces on bearings tbc Main engineering constraints Cost Mounting space Cooling Inverter airborne noise structure-born noise tbc safety back-emf short-circuit current inverter-specific properties tbc voltage current inverter-specific properties efficiency tbc EM-motive GmbH / DBEM/EEP4-Brück / slide 4
5 Component vs. (or better and?) systems engineering control path mechanical interaction thermal interaction electrical interaction circulation and environment vehicle and driver powertrain electric traction motor inverter battery IoT Internet of Things xecu other Electronic Control Units HTCU Hybrid Transmission Control Unit MCU Motor Control Unit BMS Battery Management System control unit(s) Powertrain CAN / Chassis CAN Components strongly interact Static boundary conditions not suitable for dynamic interactions Systems engineering necessary to handle the complexity EM-motive GmbH / DBEM/EEP4-Brück / slide 5
6 Workflow for virtual product development procurement phase component development systems engineering requirements power electronics + batt. Source: fmi-standard.org thermal EMAG Motor-CAD (2D) EMAG model order reduction (MOR) and system simulation material data thermal geometry structural models from third parties for transmission, gearbox, vehicle,... CAD acoustics workbench model transfer path information transfer path EM-motive GmbH / DBEM/EEP4-Brück / slide 6
7 Example 1: Noise due to electromagnetic forces Background Forces and bending moments act on stator teeth Dynamic deformation of stator and housing surface Generation of pressure waves Emission of noise Workflow for simulation ANSYS Maxwell: Electromagnetic forces and moments ANSYS Mechanical: Modal analysis Harmonic response analysis Acoustic analysis via ERP-level (Equivalent Radiated Power) Postprocessing via Waterfall diagram EM-motive GmbH / DBEM/EEP4-Brück / slide 7
8 Example 1: Noise due to electromagnetic forces Results Eigenmodes 0 and 3 Equivalent radiated power level L ERP [db] r air density c speed of sound S surface area v n surface normal velocity P 0 reference sound power L ERP = 10 lg ERP P 0 ERP = 1 2 ρcs v n 2 Postprocessing with waterfall diagram L ERP for various speed and frequencies Idendification of operating points with high noise emissions for specific motor orders EM-motive GmbH / DBEM/EEP4-Brück / slide 8
9 Example 2: Impact of scattering input parameters Background Scattering of input parameters affects output responses Probability density functions (pdf) often unkonwn Low scattering in output responses required input transfer function output Workflow for simulation OptiSlang : definition of input parameters and scattering management of overall simulation procedure Motor-Design Motor-CAD: 2D-FEA of electromagnetics characteristic curves EM-motive GmbH / DBEM/EEP4-Brück / slide 9
10 Example 2: Impact of scattering input parameters Results Probability density function of characteristic curves due to scattering of input parameters EM-motive GmbH / DBEM/EEP4-Brück / slide 10
11 Example 2: Impact of scattering input parameters Results Probability density function of characteristic curves due to scattering of input parameters Evaluation of failure cost due to customer requirements and quality of semi-finished parts requirement (nominal) requirement (limits) machines that fulfill requirement unusable machines EM-motive GmbH / DBEM/EEP4-Brück / slide 11
12 Workflow for virtual product development Postprocessing with evaluation of performance at a glance Requirements and performance indicators in different domains Cost Thermal Mechanical EMAG Control NVH Environment tbc Radar chart Dimensionless representation Requirements as 100 % reference (outside red circle = requirement fulfilled) All information in one single chart Easy comparison of several designs EM-motive GmbH / DBEM/EEP4-Brück / slide 12
13 New postprocessing features in optislang Signal plot with scattering (already available in optislang 6.1) EM-motive GmbH / DBEM/EEP4-Brück / slide 13
14 New postprocessing features in optislang Signal plot with scattering (already available in optislang 6.1) EM-motive GmbH / DBEM/EEP4-Brück / slide 14
15 New postprocessing features in optislang Signal plot with scattering (already available in optislang 6.1) EM-motive GmbH / DBEM/EEP4-Brück / slide 15
16 New postprocessing features in optislang Signal plot with scattering (already available in optislang 6.1) EM-motive GmbH / DBEM/EEP4-Brück / slide 16
17 New postprocessing features in optislang Radar chart (will be available in optislang 6.2) EM-motive GmbH / DBEM/EEP4-Brück / slide 17
18 Summary Requirements cover different physical domains and interact Systems engineering necessary to handle the complexity Workflow using Motor-CAD, ANSYS and optislang software presented Example 1: Noise due to electromagnetic forces Coupling of electromagnetics and structural mechanics Harmonic response analysis with electromagnetic forces and bending moments as loads Evaluation of noise via ERP-level and waterfall diagram Example 2: Impact of scattering input parameters Robustness analysis with optislang and Motor-CAD Probability density functions for all input parameters Characteristic curves with probability density distribution as output Evaluation of failure cost Postprocessing via Radar chart New postprocessing features implemented in optislang (signal plot with scattering & radar chart) EM-motive GmbH / DBEM/EEP4-Brück / slide 18
19 Dr.-Ing. Marc Brück Senior Expert Simulation Technology EM-motive GmbH / Postfach / Stuttgart Marc.Brueck@em-motive.com Phone: EM-motive GmbH / DBEM/EEP4-Brück / slide 19
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