Filter results

Results (220)

Sort by:

Select all Select all

Page 2

VDI Wissensforum GmbH - International Conference on Gears 2023

No access

Select

VDI Wissensforum GmbH (ed.)

International Conference on Gears 2023

Series: VDI-Berichte

Volume 2422 2023

Results in this title

S. Sklenak, D. Mevissen, J. Brimmers, C. Brecher, B. Lenz, A. Mehner Analysis of Load Cycles and Local Wear of Dry and Solid-Lubricated Gears S. 727-740

„… rolling-sliding contact is primarily depend-ent on the type of solid lubricant, the coating process and the …” „… state then changes to a transient and significantly higher frictional force. At the end of the lifetime …” „… transi-ent phase was confirmed, analogous to the literature. The course of the surface temperature on the …”

A. Donmez, A. Kahraman Experimental Investigation of Influence of Indexing Errors on Gear Rattling S. 703-714

„… tooth surfaces followed by impacts, in the process causing excessive noise issues coined as gear rattle …” „… fluctuation ( 0aT ), transient peaks of acceleration at those instants indicate a separation and impact caused …” „… sequence). While 1( )q t signals presented in Fig. 3(a,b) look similar, the transient peaks at 1 / 2 …”

S. Ebrahimi, U. Kissling, C. S. Matkovič Evaluation of the NVH Characteristics of Gear Drives with Plastic Gears by the Forced Response Analysis S. 1403-1418

„… transient gear elastohydrodynamic lubrication model and a torsional dynamic model. A simplified expression …” „… better NVH characteristics of a powertrain system. In this regard, a dynamic calculation process, called …” „… forced response analysis is conducted and at the bearing positions, the transient loads are evaluated. In …”

J. Langhart, S. Ebrahimi, T. Kelichhaus A comparison of time and frequency domain approaches for NVH S. 583-598

„… for each time step and are capable to consider transient effects of vibrations. The advantage of this …” „… approach represents the non-transient vibration only. The methods also differ in the calculation times and …” „… process is very fast. This allows the engineers and designer to quickly evaluate the gears properties with …”

I. Criscuolo, F. Carneiro, G. Guimarães, R. Rego, J. Mascheroni Indirect Selective Laser Sintering: Modeling and analysis of surface densification by shot peening S. 1681-1698

„… the study is an experimental investigation of the densification process by shot peening with parameter …” „… explanation to the densification phenomena were based on a numerical approach of the shot peening process. The …” „… processability. Figure 2 shows the complexity of the iSLS process from material to product design. Fig. 1: iSLS …”

P. E. Schnetzer, J. Pellkofer, K. Stahl Calculation method for wear of steel-bronze rolling-sliding contacts relating to worm gears S. 907-926

„… friction and wear processes exist in the literature. The currently available calculation methods usually …” „… transient and therefore able to predict the evolution of the contact pattern over time. The simulation …” „… derived from the procedure for worm gear drives according to ISO/TS 14521 [1]. In this process, the …”

A. Beinstingel, F. Haringer, W. Sigmund, M. Heider, B. Pinnekamp, S. Marburg Investigation of Sound and Vibration Behavior of Cylindrical Gears S. 599-618

„… transmission process of the mating gear teeth, the transfer path of the structure-borne sound is a complex …” „… gearbox design. It is known that the power transmission process leads to an internal vibration excitation …” „… ., shaft misalignment) as well as profile modifications may influence the power transmission process during …”

H. Jia, D. Qin, G. Hu, X. Xu, W. Bai Electromechanical Coupling Modeling and Torsional Vibration Analysis of Helicopter Electric Propulsion System S. 675-688

„… )where, 𝑖 and 𝑖 are the transient current of d and q axis respectively, and are the stator d and q …” „… freedom, they are expressed as follow:(4)The detailed modeling process can refer to another article by the …” „… increasing process of rotor, from 31.5 rad/s to 37.0 rad/s, at different increasing ratios is studied. As …”

A. I. Aydeniz Modelling and Analysis of the Effect of Root Modification on Load Sharing and Stress Values on Spur Gears S. 1039-1062

„… performed by simulating the manufacturing process. In this way, profile coordinates can be calculated point …” „… simulating the gear-generating manufacturing process, the following parameters are computed step by step …” „… motions in time domain and dynamic response of the system for steady-state or transient cases …”

E. Grabovic, A. Artoni, M. Gabiccini, E. Ciulli Exploration of trade-offs between NVH and efficiency in bevel gear design S. 853-880

„… ] provided an accurate estimation of the local friction coefficient of spur gears under transient …” „… identified during the optimization process. VDI-Berichte Nr. 2422, 2023 855Several studies in the literature …” „… utilizing ideal polynomial functions to steer the optimization process, a tailored identification algorithm …”

F. Concli, M. N. Mastrone Latest advancements in the lubrication simulations of geared systems: a technology ready for industrial applications S. 499-518

„… improve the results and describe the transient start-up, the sliding mesh approach (also called rigid mesh …” „… mesh instead of the reference system only. Despite the capability to model transient regimes, also the …” „… meshing process is significantly simplified and completed independently for each subregion. However, the …”

doi.org/10.51202/9783181024225

VDI Wissensforum GmbH - Dritev – Drivetrain For Vehicles 2018

Partial access

Select

VDI Wissensforum GmbH (ed.)

Dritev – Drivetrain For Vehicles 2018

Series: VDI-Berichte

Volume 2328 2018

Results in this title

L. Dedeleit, M. Ayeb, L. Brabetz Short circuit calculation of permanent magnet synchronous machines with comsol multiphysics S. II-197-III-VII

„… stellt verschiedene Berechnungsmethoden für die stationären und transienten Ströme der Maschine im SKS …” „… transient die auftretende Entmagnetisierung auf messbare und spezifizierte Größen wie die EMK oder das …” „… methods for the stationary and transient currents of the machine in the SSC. These are compared with each …”

R. Buchberger, O. Grieshofer, K. Puchner, R. Sereinig System optimization of electric drives in terms of lightweight design, acoustics and efficiency by means of modern transmission simulation methods S. II-31-II-46

„… topology-optimization and fatigue software tools. Regarding acoustics an engineering process for prediction of air- and …” „… areas of conflict need improved simulation tools and methods. With the following process and tools …” „… Process Starting point is a detailed customer requirements analysis. In combination with internal …”

B. Arnold, B. Lecointre Shift simulator for shift feel and quality development of manual transmissions S. I-425-I-440

„… customer satisfaction and driving experience. To be able to frontload the process of shift quality …” „… interface [3]. During the acquisition process the customer is building up an expectation out of a compound …” „… the shift simulator as well as the simulation model and its validation process. It will also give an …”

M. Mileti, H. Pflaum, K. Stahl TorqueLINE cone clutch: Thermo-mechanical stability of cone clutches for ATs S. I-357-I-368

„… to take over the synchronization process, causing no powershift to be to be possible in general [4 …” „… heat dissipated during the sliding process, multiple-disc clutches with up to 12 friction interaces …” „… ] confirm that about 95% of the friction loss is transformed into heat when considering a sliding process …”

D. Bauer, M. Alexander Loss-optimized design of a high performance electrical machine for electric and hybrid cars S. II-183-II-196

„… account. Those factors are typically achieved in the end of the designing process by various loss …” „… models (like the mentioned ones) - Demagnetization valuation - Transient effects like short circuit …” „… ”, Dissertation, University of Stuttgart, currently in printing process, planned publication in 2018 [3] Bauer …”

R. Savelsberg, P. Griefnow, G. Birmes, A. Sehr Advanced powertrain functions of 48 V hybrid vehicles – Efficient powertrains does not exclude driving pleasure S. I-499-I-516

„… V systems is to improve the combustion process by supporting the internal combustion engines …” „… transient behavior and the raw emissions with a relatively powerful electric motor or, if necessary, with …” „… start process is fully supported by the BSG up to 800 rpm. Another advantage is the direct possibility …”

M. Behzad, V. Saxena, M. Schaefer Thermal-hydrodynamic optimization of grooves in a wet clutch S. I-101-I-118

„… . 1). It is known that during the process of engagement, the gap thickness decreases until it quickly …” „… . [9] R. C. Xin and T. W. K., "Anlytical solution for transient heat conduction in two semiinfinite …”

doi.org/10.51202/9783181023280

VDI Wissensforum GmbH - International Conference on Gears 2022

No access

Select

VDI Wissensforum GmbH (ed.)

International Conference on Gears 2022

Series: VDI-Berichte

Volume 2389 2022

Results in this title

S. Ebrahimi, J. Langhart, D. Marano NVH calculations for drivetrains, a methodology for selection of the best suitable calculation approach for a specific purpose S. 75-90

„… calculation process using KISSdesign and RecurDyn software has been developed. When reading the transient …” „… calculation process for noise emitted from the housing is an established process, where the transient bearing …” „… , whereas the static calculation during the dimensioning and sizing process does ignore the influences of …”

R. Chen, D. Qin, C. Liu Study on electromechanical coupled dynamic characteristics of transmission system of wind turbine S. 763-778

„… system in the process of sudden load increase transient[J]. Mechanical Systems and Signal Processing …” „… influence of transient excitation on dynamic characteristics of wind turbine system under gust is studied …” „… electromechanical energy conversion process of a generator is a process in which the air gap magnetic field is used …”

S. Sklenak, J. Brimmers, C. Brecher Analysis of local wear within the dry lubricated rolling- sliding contact of coated surfaces S. 305-316

„… already developed in a large part of the running surface at the start of a transient phase in the test run …” „… art that the temperature in the fluid-free rolling contact exhibits transient behavior due to …” „… work, the test and counter shafts were each coated with a MoS2 coating system in a PVD process (Coating …”

A. Beinstingel, M. Heider, B. Pinnekamp, S. Marburg Gear mesh excitation and non-uniform rational B-splines S. 91-102

„… generation of gearboxes is mainly referred to the characteristic transmission process of the mating gear …” „… actual power transmission process leads to oscillating forces on the shafts and bearings [1, 2]. These …” „… methodology finding the most suitable geometry parameters supports the development process from the very …”

A. Miltenovic, M. Banic Investigation of the meshing friction heat generation of worm gears and influence of the contact shape S. 803-810

„… and prediction of transient temperature fields. This study permits an in-depth understanding of the …” „… temperature fields, together with the frictional heat generation process. Also, better control of the contact …” „… load capacity. In the paper, the transient thermal behavior among different pinion machine-setting …”

B. Schalley, J. Brimmers, T. Bergs Potential and challenges of profile gear grinding with vitrified bonded cBN S. 1569-1582

„… of vitrified bonded cBN. The grinding-in behavior is understood as a transient process phase …” „… Vitrified Bonded cBN The grinding-in behavior is a transient process phase occurring immediately after …” „… conventional grinding processes [9 to 11, 15 to 18]. In the studies carried out by other authors, the transient …”

Titelei/Inhaltsverzeichnis S. I-XXVIII

„… manufacturing processesIncreasing the safety against scuffing of additive manufactured gear wheels by internal …” „… manufacturing processesDesign of manufacturing cells in the light of improvements in manufacturing technology …” „… Preflight Lx3 am August 24, 2022 | 13:08:34 | 148 mm x 210 mmVDI-Society for Productand Process …”

P. Roth, M. Hein, K. Stahl Scuffing load capacity calculation of worm gears S. 811-824

„… numerical temperature simulation for worm gears that considers transient multidimensional heat transfer and …” „… allows for a practice-oriented application of the method within state-of-the-art design processes of worm …” „… the bodies relative to the contact area)  transient course of the contact line. The bodies and the …”

C. A. Celikay, A. Donmez, A. Kahraman An experimental study of parametric resonances of a spur gear pair at speeds above its primary resonance S. 511-522

„… force, contact loss occurs, in the process, exhibiting an array of nonlinear behavior. Mesh stiffness …” „… with orders 1 1 14 3 21 2 , , , ,r and 3, included. Meanwhile, the transient data was collected …” „… half of each figure represents the speed-down portion of the transient tests. Jump discontinuities due …”

A. Eric, D. Olveda, T. Froschmeier, V. Schulze Local pitting fatigue concept with EHL simulation for case hardened gears in electrical drives S. 133-144

„… , this neglects the large impact of the finishing process and the residual stresses should therefore be …” „… mainly based on the work described in [13-14]. In principle, the model consists of a transient mixed EHL …” „… processes. A common approach used in other local fatigue concepts is to take standardized specimens from the …”

K. Daubach, M. Oehler, B. Sauer Wear simulation of worm gears based on an energetic approach S. 329-342

„… at the beginning of the wear process. With an increasing wear height, the wear rate reduces and …” „… energy density increases during the wear process. A reason could be the simultaneously decreasing mean …” „… wear model of FLEISCHER. The iterative wear modelling procedure allows a transient analysis of local …”

N. Tros, J. Brimmers, T. Bergs Approach for multiscale modeling the thermomechanical tool load in gear hobbing S. 1489-1502

„… force and the rake face tem-perature. The hobbing process is then simulated with a geometric penetration …” „… is an established gear manufacturing process and is widely used in the wind power, automotive …” „… models have been developed to predict the resulting force components for the hobbing process [7, 8]. The …”

L. Ryali, D. Talbot Dynamic load distribution of planetary gear sets subject to both internal and external excitations S. 389-408

„… , including voltage transients and load saltations, as well as the internal excitations such as spatial …” „… model. It was found that external conditions such a voltage transients have a significant effect on the …” „… considering the actual control strategies in the simulation process, the effects of turbulent wind and voltage …”

A. Baumann, B. Bertsche Coefficient of friction behavior of gear oils and significance for the meshing process of spur gears S. 745-762

„… Coefficient of friction behavior of gear oils and significance for the meshing process of spur …” „… decisive influence on the meshing process of the gearing. 2. Friction conditions in gear meshing along …” „… synchronization device common in automotive transmissions [19]. The meshing process was measured by recording the …”

W. Kassem, M. Oehler, B. Sauer, S. Schmidt, J. Hausmann Investigation of the time-dependent behavior of plastic gears with local tribological simulation S. 1281-1294

„… simulation, as seen in Figure 1. Fig. 1: Calculation process of the multi-physics simulation 2. Case Study …” „… conditions and kinematics (left), element distribution (right) The entire meshing process of a tooth is …” „… divided into several small meshing processes and examined separately, whereby for each of these partial …”

A. Gebhard, W. Kassem, M. Oehler Cylinder-on-ring model wear tests as an input data source for the simulation of friction and wear of plastic gears S. 1133-1148

„… Mechanical and Process Engineering, Technische Universitat Kaiserslautern, Germany Abstract A Block-on-Ring …” „… manufacturing accuracy, compared to steel. While VDI 2736 [1] tries to make the established design process for …” „… the gear simulation under consideration of varying friction coefficient during the meshing process is …”

J. J. Zhang, Prof. Y. M. Hu, X. X Luan, Z. S. Zhang Research on the effectiveness of roelands formula with constant VPC in EHL of higher pair contact S. 119-132

„… the force of the fluid acting on the structure.VDI-Berichte Nr. 2389, 2022 1253 Calculation process …” „… and correctness verification(1) Calculation processThe calculation process of the EHL point contact is …” „… ., Tong, J., Yang, P.: Transient thermoelastohydrodynamic lubrication analysis of an involute spur gear …”

P. Rodel, R. Spieler, M. Indenbirken, T. Nuisl Holistic friction optimization of transmissions – a significant contribution for sustainability S. 731-744

„… development process. These models can be used for design studies. Thus, the product performance of many …” „… iterative approach to avoid time consuming transient simulations. As a result, the flash temperature is …” „… the integral friction torque. Figure 4 shows the principal process for the computation of friction …”

L. Hildebrand, F. Dangl, M. Sedlmair, T. Lohner, K. Stahl CFD analysis on the oil flow of a gear stage with guide plate S. 677-694

„… derived at an early stage of the development process, enabling an optimized gearbox design at reduced …” „… potential to derive essential information at an early stage of a gearbox development process (Morhard et al …” „… and previous studies with FVM by Liu et al. [24], [25], [26]. The modeling of the transient gear mesh …”

K. Kumagai, H. Liu, S. Kurokawa Improving pitting durability by introducing the non-linear wear propagation property of helical gears S. 317-328

„… 17.5°Helix angle 31.5°Center distance 96 mmGear finishing process(Pinion / Driven gear) Gear profile …” „… Parallel-Axis Gear Pairs, Journal of Tribology. 126.3(2004): 597-605. [5] Y.J. Chen, N. Huber, Transient Wear …”

B. Legrady, M. Taesch, G. Tschirschnitz, C. F. Mieth Prediction of churning losses in an industrial gear box with spiral bevel gears using the smoothed particle hydrodynamic method S. 651-664

„… phase interface between air and oil requires a sufficiently fine mesh and the transient deformation of …” „… share is squeezed towards the front tip of the pinion during the engagement process. Both effects lead …”

doi.org/10.51202/9783181023891

Matthias Patrick Alexander Mrosek - Model-Based Control of a Turbocharged Diesel Engine with High- and Low-Pressure Exhaust Gas

Partial access

Select

Matthias Patrick Alexander Mrosek

Model-Based Control of a Turbocharged Diesel Engine with High- and Low-Pressure Exhaust Gas

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 803 2017

Results in this title

Optimisation of the Reference Values for the Air Path Control S. 86-101

„… calibration process. Further, the HP-EGR-rate control yields lower dynamical NOx emissions during transient …” „… be considered as process inputs for the combustion process and aim to give a desired engine …” „… about the dynamical emission formation at engine transients. Investigations with three different control …”

Conclusions S. 168-171

„… for engine control development and calibration considering the exemplary process of a turbocharged …” „… Diesel engine with HP- and LP-EGR. The Diesel engine is a complex process and many facts are not known …” „… a batch process, whose output is determined by the cylinder filling at intake valve closing and the …”

Bibliography S. 190-204

„… 190 Bibliography Alberer, D. and del Re, L. (2009). Optimization of the transient Diesel engine …” „… Process Control, 13:769–786. Isermann, R. (1991). Digital Control Systems Volume 2: Stochastic Control …” „… Mechatronics, Atlanta, USA. Morari, M. and Zafiriou, E. (1989). Robust Process Control. Prentice Hall. Moulin …”

Emission and Combustion Models S. 61-85

„… emission formation. Emission and combustion models are widely used in the engine development process and …” „… combustion process by computational fluid dynamics, multi-zone or single-zone models. These models utilise …” „… modified. Therefore, black-box models are generally utilised quite late in the engine development process …”

System Properties of the Air Path with HP- and LP-EGR S. 34-60

„… recirculation process it usually takes a longer time until all transients are settled and an equilibrium is …” „… between HP- and LP-EGR can be seen in the gas propagation times. Then the gained insights into the process …” „… relationships from the process states. Note, that the fast pressure dynamics of p2i and p3 4.1 Air Path System …”

Air Path Control Design and Dynamical Reference Value Generation S. 102-167

„… linearised process model with fixed time constant and operation point dependent process gain. Furthermore …” „… transients in a map based control structure yet (Isermann, 2010; von Pfeil, 2011). Further advantages in the …” „… the feedforward model and the engine process. LP-EGR Control Various control concepts are applied for …”

Titelei/Inhaltsverzeichnis S. I-XX

„… Isermann, head of the Research Group Control Systems and Process Automation. First of all, I would like to …” „… Actuator System Responses . . . . . . . . . . . . . . . . 42 4.1.4 Time Constants and Process Gains of the …” „… constant Td dead time u process input, input variable x x-regressors y process output, output variable w …”

Appendix S. 172-189

„… real-world engine process. All combustion engines are mounted on roll carts and are equipped with quick …” „… process is influenced by the cylinder charge and the rather complex combustion characteristics. For the …” „… some information about the course of the combustion process. The exhaust temperature model (3.31 …”

doi.org/10.51202/9783186803122

VDI Wissensforum GmbH - Dritev – Drivetrain For Vehicles 2019

Partial access

Select

VDI Wissensforum GmbH (ed.)

Dritev – Drivetrain For Vehicles 2019

Series: VDI-Berichte

Volume 2354 2019

Results in this title

R. Gat, M. Ehlen Virtual lubrication analysis – Simulation of oil flow in gearboxes using a novel lagrangian approach S. I-133-I-136

„… , while major design changes may already lead to a delay in the development process. Further, these …” „… reasons a reliable and stable way to simulate these processes will help to prove a developed concept …” „… management problems, which can be applied to calculate all kind of transient free surface flows in a very …”

C. Dassler, M. Kurch, M. Nichols NVH-challenges and solution approaches in electric drive development from the supplier‘s view S. I-349-I-366

„… demands. One increasingly crucial task in the product development process is fulfilling the NVH …” „… overview of the most important aspects of this process is given in Fig. 4. Fig. 4: Overview of …” „… electric motor NVH layout process Cross-correlations between current displacement and rotor eccentricity …”

J. Grabowski, A. Colognese 48V to 12V Converters for xEV Applications – Managing the headaches of dual voltage automotive architectures S. II-45-II-54

„… withstanding high transient voltages (up to 60V in some cases). In order to address the problem, three …” „… higher transient voltages) • Input Offset Voltage (small the better, indicated higher accuracy …” „… decades, with the development of advanced fab processes and IC design architectures, dedicated current …”

U. Stockinger, H. Pflaum, K. Stahl Single vs. multi-cone synchronizers with carbon friction lining – A comparison of load limits and deterioration behavior S. I-455-I-470

„… synchronization process, a cone clutch with up to three friction surfaces is used to accelerate or decelerate …” „… transferred by a positive dog clutch. The synchronization process is described in detail by [1, 2 …” „… process of new brass triple cone synchronizers and associated problems during testing and their …”

S. Kluemper Benefits of the new Allison 9-speed fully automatic – Medium duty commercial transmission S. III-61-III-74

„… interrupt shift The other point to consider is the undeniable transient operation of a power interrupt …” „… the engine and the benefits are easy to understand. Figure 7: The transient engine operation of …” „… . Production readiness activities are in process and production timing is being finalized. Allison …”

S. Stöhr, R. Koesling, V. Marx New all-wheel drive systems in Mercedes-Benz SUVs S. I-483-I-500

„… improved utilization of the transient behavior of all the new engines through a reduction of the backlash …” „… . compliance with the requirements of the assembly process. The Mercedes-Benz SUV- All-Wheel Drivetrain In …”

D. Schweigert, M. Mileti, B. Morhard, M. Sedlmair, M. Fromberger, M. Otto, T. Lohner, K. Stahl Innovative transmission concept for hyper-high-speed electromechanical powertrains S. I-541-I-554

„… losses occurring in gear boxes which allows to predict the steady-state temperature, transient …” „… modification design process. As the STE is an indicator for the vibration behaviour of a gearing at low speeds …”

doi.org/10.51202/9783181023549

1

2

3 ... 44