Jürg Alexander Schiffmann
EPFL STI IGM LAMD
MC B2 255 (Bâtiment MC)
Rue de la Maladière 71b, CP 526
CH-2002 Neuchâtel 2
+41 21 695 45 48
+41 21 695 45 13
Local: MC B2 245
EPFL > STI > IGM > LAMD
Web site: Site web: https://lamd.epfl.ch/
Domaines de compétences
BiographieAfter obtaining his diploma in mechanical engineering from EPFL in 1999 he co-founded a start-up company dedicated to the design of gas bearing supported rotors. In 2005 he joined Fischer Engineering Solutions where he led the development of small-scale, gas bearing supported high-speed turbomachinery for fuel cell air supplies and for domestic scale heat pumps. In parallel he worked on his PhD, which he obtained from EPFL in 2008 and for which he was awarded the SwissElectric Research Award. He then joined the Gas Turbine Lab at MIT as a postdoctoral associate where he worked on foil bearings and on the experimental investigation of radial diffusers. In 2013 he was nominated assistant professor and in 2020 associated professor with tenure at the Ecole Polytechnique Fédérale de Lausanne, where he leads the Laboratory for Applied Mechanical Design. His current research interest are in gas lubricated bearings, in aerodynamics of small-scale turbomachinery and in automated design and optimization methodologies.
Design and experimental investigation of a herringbone grooved gas bearing supported turbochargerMechanical Systems and Signal Processing. 2023-03-01. DOI : 10.1016/j.ymssp.2022.109828.
The influence of splitter blades and meridional profiles on the performance of small-scale turbopumps for ORC applications; analysis, neural network modeling and optimizationThermal Science and Engineering Progress. 2023-02-23. DOI : 10.1016/j.tsep.2023.101734.
Readiness evaluation of SOFC-MGT hybrid systems with carbon capture for distributed combined heat and powerEnergy Conversion and Management. 2023-01-31. DOI : 10.1016/j.enconman.2023.116728.
Haptics based multi-level collaborative steering control for automated drivingCommunications Engineering. 2023-01-23. DOI : 10.1038/s44172-022-00051-2.
Thermal management for gas lubricated, high-speed turbomachineryApplied Thermal Engineering. 2023-01-05. DOI : 10.1016/j.applthermaleng.2022.119229.
High-speed turbocompressors for natural fluid heat-pumps: from integrated design to digital-twin.Lausanne, EPFL, 2023. DOI : 10.5075/epfl-thesis-8970.
Dynamic stall characterisation and control for vertical-axis wind turbinesLausanne, EPFL, 2023. DOI : 10.5075/epfl-thesis-9744.
Analysis and modeling of the tip leakage flow on the performance of small-scale turbopumps for ORC applicationsApplied Thermal Engineering. 2022-11-25. DOI : 10.1016/j.applthermaleng.2022.119160.
Heat transfer of flow boiling carbon dioxide in vertical upward directionInternational Journal of Heat and Mass Transfer. 2022-11-01. DOI : 10.1016/j.ijheatmasstransfer.2022.123246.
Experimental and numerical investigation of the unbalance behavior of rigid rotors supported by spiral-grooved gas journal bearingsMechanical Systems And Signal Processing. 2022-07-15. DOI : 10.1016/j.ymssp.2022.109080.
Adiabatic two-phase pressure drop of carbon dioxide in different channel orientationsInternational Journal of Heat and Fluid Flow. 2022-06-01. DOI : 10.1016/j.ijheatfluidflow.2022.108966.
Experimental Investigation of Enhanced Grooves for Herringbone Grooved Journal BearingsJournal of Tribology. 2022-03-18. DOI : 10.1115/1.4053978.
Flow pattern observations and flow pattern map for adiabatic two-phase flow of carbon dioxide in vertical upward and downward directionExperimental Thermal and Fluid Science. 2022-02-01. DOI : 10.1016/j.expthermflusci.2021.110526.
Robust design using multiobjective optimisation and artificial neural networks with application to a heat pump radial compressorDesign Science. 2022-01-06. DOI : 10.1017/dsj.2021.25.
Active origami platforms for human-robot interactionsLausanne, EPFL, 2022. DOI : 10.5075/epfl-thesis-9649.
Flow Boiling of Carbon Dioxide at Different Channel Orientations for the Thermal Management of Future Detector Technologies at the High-Luminosity Large Hadron Collider at CERNLausanne, EPFL, 2022. DOI : 10.5075/epfl-thesis-8930.
Numerical and experimental investigation of spiral-grooved gas journal bearingsLausanne, EPFL, 2022. DOI : 10.5075/epfl-thesis-10038.
Modelling and Sensors for Magnetically-Levitated Disc DrivesLausanne, EPFL, 2022. DOI : 10.5075/epfl-thesis-8837.
Which professional skills do students learn in engineering team-based projects?European Journal of Engineering Education. 2022. DOI : 10.1080/03043797.2021.1920890.
Unstable tilting motion of flexibly supported gas bearing bushingsMechanical Systems and Signal Processing. 2022-01-01. DOI : 10.1016/j.ymssp.2021.107981.
Stability and Unbalance Analysis of Rigid Rotors Supported by Spiral Groove Bearings: Comparison of Different ApproachesJournal of Engineering for Gas Turbines and Power. 2021-12-01. DOI : 10.1115/1.4052025.
A reduced order model to predict the machining time and cost of small-scale radial-inflow turbines2021-11-04. 6th International Seminar on ORC Power Systems (ORC2021), Munich, Germany, October 11-13, 2021.
The effects of the tip clearance on the performance of small-scale turbopumps for ORC applications; analysis and modeling2021-11-04. 6th International Seminar on ORC Power Systems (ORC2021), Munich, Germany, October 11-13, 2021.
Techno-Economic Optimization of an Integrated Biomass Waste Gasifier–Solid Oxide Fuel Cell PlantFrontiers in Energy Research. 2021-06-07. DOI : 10.3389/fenrg.2021.665585.
On the Application of Small-Scale Turbines in Industrial Steam NetworksEnergies. 2021-05-28. DOI : 10.3390/en14113149.
Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine with Partial-AdmissionJournal of Engineering for Gas Turbines and Power. 2021-03-31. DOI : 10.1115/1.4049483.
Experimental Investigation of a Small-Scale Organic Rankine Cycle Turbo-Generator Supported on Gas-Lubricated BearingsJournal of Engineering for Gas Turbines and Power. 2021-03-11. DOI : 10.1115/1.4049988.
Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine with Partial-Admission2021-01-11. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, London, England - virtual conference, June 22-26, 2020. p. GT2020-15804, V008T20A023. DOI : 10.1115/GT2020-15804.
Influence of Large Relative Tip Clearances for a Micro Radial Fan and Design Guidelines for Increased Efficiency2021-01-11. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, London, England - virtual conference, June 22-26, 2020. p. GT2020-15994, V008T20A025. DOI : 10.1115/GT2020-15994.
Experimental investigation and analysis of sequential jet impingement concepts for enhanced turbine coolingLausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-8721.
Flexibility for large-scale deployment of PV systems in low-voltage gridsLausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-8852.
Automated Design: A Journey Across Modelling, Optimization, and EducationLausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-7945.
Prediction of the reaction forces of spiral-groove gas journal bearings by artificial neural network regression modelsJournal of Computational Science. 2021-01-01. DOI : 10.1016/j.jocs.2020.101256.
Nonlinear study on a rigid rotor supported by herringbone grooved gas bearings: Theory and validationMechanical Systems and Signal Processing. 2021-01-01. DOI : 10.1016/j.ymssp.2020.106983.
Automated Design Tool for Automotive Control Actuators2020-11-03. 46th Design Automation Conference (DAC), Virtual, Online, August 17–19, 2020. DOI : 10.1115/DETC2020-22390.
Realistic Constrained Multi-Objective Optimization Benchmark Problems from DesignIEEE Transactions on Evolutionary Computation. 2020-08-28. DOI : 10.1109/TEVC.2020.3020046.
Actuator Synthesis and Optimization: Evaluation of Graph-Based Approaches2020-06-19
Experimental Assessment of a 3D-Printed Stainless Steel Gas Foil BearingJournal of Tribology. 2020-06-05. DOI : 10.1115/1.4047193.
Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense GasesJournal of Engineering for Gas Turbines and Power. 2020-06-01. DOI : 10.1115/1.4047124.
Analysis of Spiral-Grooved Gas Journal Bearings by the Narrow-Groove Theory and the Finite Element Method At Large EccentricitiesJournal of Tribology. 2020-04-01. DOI : 10.1115/1.4045636.
Flexible Support for Gas-Lubricated Bearing BushingsTribology Transactions. 2020-03-25. DOI : 10.1080/10402004.2020.1717702.
The Role of Reynolds Number Effect and Tip Leakage in Compressor Geometry Scaling at Low Turbulent Reynolds NumbersJournal of Turbomachinery. 2020-03-15. DOI : 10.1115/1.4045465.
Experimental characterization of a solid oxide fuel cell coupled to a steam-driven micro anode off-gas recirculation fanApplied Energy. 2020-03-15. DOI : 10.1016/j.apenergy.2019.114219.
Theoretical and Experimental Investigation of a Small-scale, High-speed, and Oil-free Radial Anode Off-gas Recirculation Fan for Solid Oxide Fuel Cell SystemsJournal of Engineering for Gas Turbine and Power. 2020-02-14. DOI : 10.1115/1.4045104.
Pressure Profile Measurements within The Gas Film of Journal Foil Bearings Using An Instrumented Rotor with TelemetryJournal of Engineering for Gas Turbines and Power. 2020-02-03. DOI : 10.1115/1.4044798.
Dynamic force coefficients identification on air-lubricated herringbone grooved journal bearingMechanical Systems and Signal Processing. 2020-02-01. DOI : 10.1016/j.ymssp.2019.106498.
An Instrumented High-Speed Rotor with Embedded Telemetry for The Continuous Spatial Pressure Profile Measurement in Gas Lubricated Bearings: A Proof of ConceptJournal of Engineering for Gas Turbines and Power. 2020-01-29. DOI : 10.1115/1.4044797.
Small-scale organic Rankine cycle turbo-generator for waste heat recovery on truck engineLausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-10347.
Numerical and experimental investigations on non-contacting seals for small-scale applicationsLausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-10289.
Experimental and Numerical Investigation of a Small-Scale Steam Turbine2020-01-01
Sofc system with anode off-gas recirculationHRP20221077 ; SI3834244 ; ES2924046 ; PL3834244 ; RS63547 ; PT3834244 ; DK3834244 ; EP3834244 ; EP3834244 ; WO2020030796 ; EP3609006 . 2020.
Advanced design methods and non-ideal gas lubrication applied to aerodynamic bearingsLausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-7790.
Scale limitations of gas bearing supported turbocompressors for vapor compression cyclesInternational Journal of Refrigeration. 2020-01-01. DOI : 10.1016/j.ijrefrig.2019.09.019.
A Review of Grooved Dynamic Gas BearingsApplied Mechanics Reviews. 2020-01-01. DOI : 10.1115/1.4044191.
An Instrumented High-Speed Rotor With Embedded Telemetry For The Continuous Spatial Pressure Profile Measurement In Gas Lubricated Bearings: A Proof Of Concept2019-11-05. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, AZ, Jun 17-21, 2019. p. V07BT34A026. DOI : 10.1115/GT2019-90983.
Thin Gas Film Isothermal Condensation in Aerodynamic BearingsJournal of Tribology. 2019-11-01. DOI : 10.1115/1.4044447.
Design and Experimental Realization of a Steam-Driven Micro Recirculation Fan for Solid Oxide Fuel Cell Systems2019-09-08. 16th Symposium on Solid Oxide Fuel Cells (SOFC-XVI), Kyoto, Japan, September 8-13, 2019. p. 187-193. DOI : 10.1149/09101.0187ecst.
High temperature heat pumps – Theoretical study on low GWP HFO and HCFO refrigerants2019-08-25. ICR 2019 - The 25th IIR International Congress of Refrigeration, Montréal, Québec, Canada, August 24-30, 2019.
High temperature heat pump using HFO and HCFO refrigerants – system design and experimental results2019-08-25. ICR 2019 - The 25th IIR International Congress of Refrigeration, Montréal, Québec, Canada, August 24-30, 2019.
Multi-Objective Optimization of Grooved Gas Journal Bearings for Robustness in Manufacturing TolerancesTribology Transaction. 2019-08-22. DOI : 10.1080/10402004.2019.1642547.
Data-Driven Model for the Dynamic Characteristics of O-Rings for Gas Bearing Supported RotorsJournal of Applied Mechanics. 2019-08-01. DOI : 10.1115/1.4043473.
Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems2019-06-17. ASME Turbo Expo 2019, Phoenix AZ, USA, June 17-21, 2019. p. GT2019-91361. DOI : 10.1115/GT2019-91361.
Impact of large tip clearance ratios on the performance of a centrifugal compressor2019-04-08. Euro Turbo Conderence ETC13, Lausanne, Switzerland, April 8-12, 2019.
Performance potential of gas foil thrust bearings enhanced with spiral groovesTribology International. 2019-03-01. DOI : 10.1016/j.triboint.2018.11.003.
Assessing student learning of design and project management skills in a project-based courseSFDN Conference 2019, Zurich, Switzerland.
Two-phase and oil-free co-rotating scroll compressor/expanderApplied Thermal Engineering. 2019-02-05. DOI : 10.1016/j.applthermaleng.2018.11.037.
Analytical and Numerical Investigation of a Small-scale Radial-Inflow Steam Turbine2019-01-31
Pressure Profile Measurements Within The Gas Film Of Journal Foil Bearings Using An Instrumented Rotor With Telemetry2019. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, AZ, Jun 17-21, 2019. DOI : 10.1115/GT2019-90984.
Flexible support and enhanced groove geometries for gas lubricated bearingsLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9774.
Predicting the dynamic behavior of Francis turbine generating unitsLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-7131.
Mitigation of tip leakage induced phenomena in a low Reynolds number centrifugal compressor via blade loading distributionLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9720.
Cylindrical Dielectric Elastomer Actuator for Cardiac Assist DeviceLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9397.
Integrated Design, Optimization, and Experimental Realization of a Steam-Driven Micro Recirculation Fan for Solid Oxide Fuel Cell SystemsLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9337.
An Experimental Study of Gas Lubricated Foil Journal Bearings Using an Instrumented Rotor with Wireless TelemetryLausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9163.
Data-Driven Predesign Tool for Small-Scale Centrifugal Compressor in RefrigerationJournal of Engineering for Gas Turbines and Power. 2018-10-24. DOI : 10.1115/1.4040845.
Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal BearingsTribology Transactions. 2018-10-04. DOI : 10.1080/10402004.2018.1480078.
Impacts of Constraints and Constraint Handling Strategies for Multi-Objective Mechanical Design Problems2018-07-15. GECCO '18, Kyoto, Japan, July 15–19, 2018. p. 1341–1347. DOI : 10.1145/3205455.3205526.
High Temperature Heat Pumps: Market Overview, Stateof the Art, Research Status, Refrigerants, and Application Potentials2018-07-09. 17th International Refrigeration and Air Conditioning Conference, Purdue, USA, July 9-12, 2018. p. 2200, Page 1-10.
Small, High-Speed, Oil-Free Radial Turbo-compressors for Cooling Applications: Refrigerant Selection2018-07-09. 24 th International Compressor Engineering Conference, Purdue, USA, July 9-12, 2018. p. 2386, pages 1-10.
High temperature heat pump using HFO and HCFO refrigerants – System design, simulation, and first experimental results2018-07-09. 17 th International Refrigeration and Air Conditioning Conference at Purdue, Purdue, USA, July 9-12, 2018.
Multi-objective optimization of turbo-ORC systems for waste heat recovery on passenger car enginesEnergy. 2018-06-27. DOI : 10.1016/j.energy.2018.06.193.
Effects of humid air on aerodynamic journal bearingsTribology International. 2018-06-15. DOI : 10.1016/j.triboint.2018.06.002.
Data-Driven Pre-Design Tool for Small Scale Centrifugal Compressors in Refrigeration2018-06-11. ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, June 11-15, 2018. p. V008T26A012. DOI : 10.1115/GT2018-76349.
Dimensionless correlations and performance maps of scroll expanders for micro-scale Organic Rankine CyclesEnergy. 2018-05-06. DOI : 10.1016/j.energy.2018.05.001.
Real-gas effects on aerodynamic bearingsTribology International. 2018-01-08. DOI : 10.1016/j.triboint.2018.01.008.
A co-rotational scroll machineCN111630277 ; US11306717 ; US2021062807 ; EP3740679 ; CN111630277 ; WO2018134739 . 2018.
Pumps running as turbines for energy recovery in water supply systemsLausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-9036.
Potential and Challenges of ORC driven Heat Pumps Based on Gas Bearing Supported TurbomachineryLausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8567.
High temperature heat pumps: Market overview, state of the art, research status, refrigerants, and application potentialsEnergy. 2018. DOI : 10.1016/j.energy.2018.03.166.
Experimental characterisation of the thermohydraulic performance of a micro-pin fin evaporator: Heat transfer, flow visualization and modellingLausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8423.
MEMS Generator Study for an Embedded Energy Harvesting SystemLausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8380.
Dynamic pressure probe response tests for robust measurements in periodic flows close to probe resonating frequencyMeasurement Science and Technology. 2018. DOI : 10.1088/1361-6501/aa9cf4.
Small scale radial inflow turbine performance and pre-design maps for Organic Rankine CyclesEnergy. 2018. DOI : 10.1016/j.energy.2017.11.002.
Non-linear transfer function identification of pressure probes using Siren DisksExperimental Thermal and Fluid Science. 2018. DOI : 10.1016/j.expthermflusci.2017.11.001.
Blade Tio Loss in a Small-Scale Fan2017-06-09
Comparative Evaluation of Foil Bearings with Different Compliant Structures for Improved Manufacturability2017. ASME Turbo Expo, Charlotte, North Carolina, USA, June 26-30, 2017. p. V07AT34A014. DOI : 10.1115/GT2017-63615.
Thermo-economic optimization of an ORC driven heat pump based on small scale turbomachinery and comparison with absorption heat pumpsInternational Journal of Refrigeration. 2017. DOI : 10.1016/j.ijrefrig.2017.05.021.
Modeling and Designing of a Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell SystemsJournal of Electrochemical Energy Conversion and Storage. 2017. DOI : 10.1115/1.4036401.
Heat Pump driven by a Small-Scale Oil-Free Turbocompressor – System Design and Simulation2017. 12th IEA Heat Pump Conference 2017, Rotterdam, Netherlands, May 14-18, 2017.
ORC Driven Heat Pump Running on Gas Bearings for Domestic Applications: Proof of Concept and Thermo-Economic Improvement Potential2017. 12th IEA heat Pump Conference 2017, Rotterdam, Netherlands, May 14-18, 2017.
Enseignement & Phd