A5083917862- Hydraulic and Pneumatic Systems
- Brake Systems and Friction Analysis
- Electric and Hybrid Vehicle Technologies
- Tribology and Lubrication Engineering
- Fuel Cells and Related Materials
- Gear and Bearing Dynamics Analysis
- Engineering Applied Research
- Tribology and Wear Analysis
- Energy Efficiency and Management
- Aerodynamics and Fluid Dynamics Research
- Advanced machining processes and optimization
- Lubricants and Their Additives
- Heat transfer and supercritical fluids
- Industrial Vision Systems and Defect Detection
- Image and Object Detection Techniques
- Non-Destructive Testing Techniques
- Iterative Learning Control Systems
- Powder Metallurgy Techniques and Materials
- Advanced Combustion Engine Technologies
- Mechanical Engineering and Vibrations Research
- Magnetic Bearings and Levitation Dynamics
- Electric Motor Design and Analysis
Technical University of Munich
2022-2025
Wet brakes and clutches are crucial drivetrain components widely used in many sectors. However, their drag losses can account for a considerable share of the overall losses. Therefore, investigation loss behavior wet has been subject research since 1970s. This paper aims to provide comprehensive overview existing knowledge identify future directions. To this end, scoping review was conducted according PRISMA guideline. It found that mainly, but not only, focused on gaining fundamental...
Fundamental knowledge of the oil flow in a disengaged wet clutch is essential for optimizing cooling performance and drag losses. However, no fundamental information on torque generation available dip-lubricated clutches. Therefore, sub-millimeter gap was experimentally investigated three practically relevant levels. To enable optical access to gap, transparent components were used. Further, high-speed camera used capture grooving. Independent set level, oil-filled at low differential...
Abstract Increasing the speed of electric motor can significantly improve power density powertrain EVs (Electric Vehicles), resulting in a smaller size and thus weight cost advantages. Achieving acceptable NVH behavior becomes more difficult at higher speeds, partly because excitation frequencies gears cover wider frequency range therefore natural also be directly excited. In Speed4E joint research project, high-speed electromechanical was developed, manufactured, tested to investigate main...
The drag loss behavior of a disengaged wet clutch is influenced, among other things, by the movement plates. Therefore, knowledge about plate essential for investigating and optimizing behavior. This paper presents methodology image-based measurement in clutches. A torque test rig equipped with camera to create image series. oil displacement from measuring zone crucial obtain permanent optical access pack. rough positions are determined segmentation using thresholding template matching....
Abstract Fundamental knowledge of wet clutches’ drag loss behavior is essential for designing low-loss clutch systems. In contrast to the widely investigated injection lubrication, more comprehensive needed on dip-lubricated clutches. development phase, data-driven models allow predictions with low computational effort and, at same time, sufficient accuracy. Therefore, this study aimed deepen and expand clutches based experimental investigations. Moreover, investigations were designed...
Drag loss calculation models support designing low-loss wet clutch systems and determining drivetrain efficiency. Available numerical require high computational effort, whereas analytical provide only limited accuracy. In contrast, data-driven unite the advantages of fast effective drag prediction and, thus, enable practice-oriented development. Therefore, this study aimed to build a model clutches' losses, enabling predictions with low effort at same time, sufficient accuracy while taking...
Abstract In wet clutches, load-independent drag losses occur in the disengaged state and under differential speed due to fluid shearing. The torque of a clutch can be determined accurately reliably by means costly time-consuming measurements. As an alternative, already precisely calculated early development phase using computing-intensive CFD models. contrast, simple analytical calculation models allow rough but non-time-consuming estimation. Therefore, aim this study was develop methodology...
A fundamental understanding of wet clutches’ drag loss behavior is essential for designing efficient clutch systems. It has been widely recognized that the separation immediately after disengaging and resulting clearance distribution influence behavior. However, these influencing factors have yet to be systematically investigated. Therefore, this study aimed experimentally investigate effects plate on under different operating conditions modes. For purpose, image series an system were...
For wet disk clutches, the energy input is strongly influenced by its friction behavior. However, behavior cannot be simulated and therefore mostly derived from experimental data for specific clutch systems. This paper presents a new approach identification validation of linear models using analysis variance (ANOVA) stepwise regression. Therefore, we use three different systems with paper- carbon-based lining. The designed experiments support an efficient parameter-based obtained can used as...
The driving comfort and safety of the automotive powertrain are significantly related to performance, lifetime, functionality lubricant. presented study focuses on investigating performance loss lubricant due water contamination resulting from environmental influences iron particles originating wear different machine elements. main purpose is determine critical factors that contribute degradation lubricant, increase tendency NVH behavior, leading adverse losses respective user. Therefore,...
High-speed electric drive units promise improved power density and, theoretically, driving range of battery vehicles. An essential step the development process is extensive testing unit on a test rig. In particular, at high rotational speed level, experimental can be challenging. This paper describes rig for investigating overall function high-speed and transmission’s efficiency dynamics. The developed in Speed4E research project was reference unit. based concept electrical circulation....