Stefan Kock
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View article: Tribological analysis of the plain bearings in an external gear pump
Tribological analysis of the plain bearings in an external gear pump Open
Tribological loads in the plain bearings of external gear pumps are influenced by system-specific parameters (e.g. elasticity of the components, micro-geometry and manufacturing tolerances) and the operating point (rotation speed, operatin…
View article: Design study for a multicomponent transducer for wind turbine test benches
Design study for a multicomponent transducer for wind turbine test benches Open
This paper covers the design study of a multicomponent transducer (MCT) for wind turbine test benches. The MCT will cover the characteristics of wind turbines in the power range of up to 6 MW. The motivation to develop a MCT such as this i…
View article: Parasitic loads in torque standard machines: a characterization, comparison, and evaluation
Parasitic loads in torque standard machines: a characterization, comparison, and evaluation Open
In torque standard machines, different kinds of bearings are used to reduce the influence of parasitic loads under the assumption that such loads are low. In accordance with EURAMET cg-14, the signal of a torque transducer is averaged over…
View article: Influences on torque measurement in nacelle test benches and their effect on the measurement uncertainty and consequences of a torque calibration
Influences on torque measurement in nacelle test benches and their effect on the measurement uncertainty and consequences of a torque calibration Open
Torque measurement in the MN·m range is important in nacelle test benches, as it constitutes the primary value for the efficiency determination of wind turbine drive trains. However, no traceable measurement is possible above 1.1 MN·m. At …
View article: Load analysis of special operation conditions and implementation of derived load states in Bearing Robustness Test (BRT)
Load analysis of special operation conditions and implementation of derived load states in Bearing Robustness Test (BRT) Open
Premature bearing outages at the planetary and high speed shaft stage of gearboxes are responsible for long down time periods of wind turbines [1, 2]. In order to prevent premature bearing outages against certain failure mechanisms, a new …
View article: Determination of Wind Turbine Main Bearing Load Distribution
Determination of Wind Turbine Main Bearing Load Distribution Open
The presented paper introduces simulative method for the determination of load and pressure distribution in the main roller bearings in multi-MW wind turbines. This method has been developed using the example of a generic 6 MW research win…
View article: Calibration of torque measurement under constant rotation in a wind turbine test bench
Calibration of torque measurement under constant rotation in a wind turbine test bench Open
To determine the efficiency of multi-MW wind turbines, the torque measurement in wind turbine test benches has to be performed with an accuracy better than 0.2 %. To this end, the torque measurement has to be traced to national standards i…
View article: 5.1.3 Torque calibration in the MN m range under rotation in a nacelle test bench
5.1.3 Torque calibration in the MN m range under rotation in a nacelle test bench Open
Mechanical torque M is the most important parameter for the power transmission of wind turbines in general and on nacelle test benches.However, torque measurement in nacelle test benches is not yet traceable to national standards, conseque…
View article: 1.2.2 Design study for a multi-component transducer for wind turbine test benches
1.2.2 Design study for a multi-component transducer for wind turbine test benches Open
This paper covers the design study of a multi-component transducer (MCT) for wind turbine test benches.The MCT will cover the characteristics of wind turbines in the performance class up to 6 MW.The motivation to develop such a MCT is to p…
View article: Measurement uncertainty estimation of a novel torque transducer for wind turbine test benches
Measurement uncertainty estimation of a novel torque transducer for wind turbine test benches Open
This paper covers the measurement uncertainty estimation of a novel 5 MN·m torque transducer based on the Force-Lever principle for wind turbine test benches. The motivation of this novel transducer is to provide a satisfying accuracy in t…
View article: Simulation Method for the Characterisation of the Torque Transducers in MN·m range
Simulation Method for the Characterisation of the Torque Transducers in MN·m range Open
MN·m torque measurement in wind turbine test benches and in the field is influenced by specific system-dependent parameters (e.g. rotational speed, multi-axial operation loads or deformation). Each of these parameters have a share in the t…
View article: Friction as a major uncertainty factor on torque measurement in wind turbine test benches
Friction as a major uncertainty factor on torque measurement in wind turbine test benches Open
Most of the existing multi-MW nacelle test benches (NTB) measure the MN·m torque before load application system (LAS) to reduce the cross-talk effect of the multi-component forces and bending moments on torque measurement. This means that …
View article: Robustness Test for Wind Turbine Gearbox Bearings
Robustness Test for Wind Turbine Gearbox Bearings Open
This paper introduces an innovative approach for the creation of the robustness test against specific failures of the planetary and HSS bearings (e.g. classical fatigue, smearing, micro-pitting, and lip fractures) in the wind turbine gearb…
View article: Design of an independent smart service platform for wind turbines
Design of an independent smart service platform for wind turbines Open
The "Internet of Things" has become more and more common. All kinds of facilities are connected to the world wide web and exchange vast amounts of information. The interconnection of wind turbines and their operators is already state of th…
View article: Development of a torque calibration procedure under rotation for nacelle test benches
Development of a torque calibration procedure under rotation for nacelle test benches Open
Precise torque measurement in multi-MW nacelle test benches (NTBs) is crucial for the efficiency determination of wind turbines. However, because the torque transducers of NTBs are not yet traceable to national standards, their accuracy is…
View article: Measurement uncertainty evaluation of torque measurements in nacelle test benches
Measurement uncertainty evaluation of torque measurements in nacelle test benches Open
Torque measurement in the MN∙m range is important in nacelle test benches as it constitutes a main value for the efficiency determination of wind turbine drive trains. However, no traceable measurement is possible above 1.1 MN∙m. At the mo…