High-Speed Contact Study between a Ti-6-Al-4V Tool and an Abradable Coating Using Ballistic Benches and a Dynamic Compensation Approach

2017 ◽  
Vol 38 (6) ◽  
pp. 444-449 ◽  
Author(s):  
Andrea Cappella ◽  
Julien Vincent ◽  
Sylvain Philippon ◽  
Laurent Faure
Keyword(s):  
High Speed ◽  
Dynamic Compensation ◽  
Abradable Coating ◽  
Compensation Approach

scholarly journals Decoupling Control for Dual-Winding Bearingless Switched Reluctance Motor Based on Improved Inverse System Method

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Zhiying Zhu ◽  
Yukun Sun ◽  
Ye Yuan
Keyword(s):  
High Speed ◽  
Switched Reluctance Motor ◽  
Inverse System ◽  
Decoupling Control ◽  
System Stability ◽  
Dynamic Compensation ◽  
Switched Reluctance ◽  
Inverse System Method ◽  
System Method ◽  
Reluctance Motor

Dual-winding bearingless switched reluctance motor (BSRM) is a multivariable high-nonlinear system characterized by strong coupling, and it is not completely reversible. In this paper, a new decoupling control strategy based on improved inverse system method is proposed. Robust servo regulator is adopted for the decoupled plants to guarantee control performances and robustness. A phase dynamic compensation filter is also designed to improve system stability at high-speed. In order to explain the advantages of the proposed method, traditional methods are compared. The tracking and decoupling characteristics as well as disturbance rejection and robustness are deeply analyzed. Simulation and experiments results show that the decoupling control of dual-winding BSRM in both reversible and irreversible domains can be successfully resolved with the improved inverse system method. The stability and robustness problems induced by inverse controller can be effectively solved by introducing robust servo regulator and dynamic compensation filter.

scholarly journals Model-Based Predictive Rotor Field-Oriented Angle Compensation for Induction Machine Drives

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2049
Author(s):  
Yang Liu ◽  
Jin Zhao ◽  
Quan Yin
Keyword(s):  
High Speed ◽  
Low Cost ◽  
Dynamic Performance ◽  
Induction Machine ◽  
Predictive Algorithm ◽  
Model Based ◽  
Induction Machine Drives ◽  
The Stability ◽  
Compensation Approach ◽  
Machine Drives

In this paper, a model-based predictive rotor field-oriented angle compensation approach is proposed for induction machine drives. Indirect rotor field-oriented control is widely used in induction machine drives for its simple implementation and low cost. However, the accuracy of the rotor field-oriented angle is affected by variable parameters such as the rotor resistance and inductance. An inaccurate rotor field-oriented angle leads to a degradation of the torque and dynamic performance, especially in the high-speed flux-weakening region. Therefore, the d-axis and q-axis currents in the rotation reference frame are predicted based on the model and compared with the feedback current to correct the rotor field-oriented angle. To improve the stability and robustness, the proposed predictive algorithm is based on the storage current, voltage, and velocity data. The algorithm can be easily realized in real-time. Finally, the simulated and experimental results verify the algorithm’s effectiveness on a 7.5 kW induction machine setup.

scholarly journals Numerical Simulation of Tool/Abradable Material Interaction Experiments

2012 ◽  
Author(s):  
Alain Batailly ◽  
Marion Cuny ◽  
Mathias Legrand
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Robust Solution ◽  
Abradable Coating ◽  
Rotor Stator Interaction ◽  
Material Interaction ◽  
Numerical Strategy

Applying abradable coating on the casing of turbomachines has been widely recognized as a robust solution advantageously combining the adjustment of operating clearances with the reduction of potential non-repairable damages. Thus, the modeling of this material is a growing field of investigation. Based on the numerical strategy proposed and detailed in previous publication by the same authors, the present study aims at capturing the mechanical behavior of abradable coating in the context of high speed interaction with a rigid tool. The plastic law given is first enriched in order to take into account strain rate dependence. The sensitivity of the model regarding its main numerical parameters is assessed and highlights the role of each of these parameters. The calibration of numerical results with respect to experimental results lead to very satisfying results that confirm that the proposed strategy is well-suited for the modeling of abradable coating. Finally, the newly developped viscoplastic law is applied to a 3D rotor/stator interaction case to determine the criticity of strain rate dependence in the case of blade/casing contact.

scholarly journals Dynamic Compensation based on High-speed Vision and its Application to Industrial Robots

2017 ◽  
Vol 35 (8) ◽  
pp. 591-595 ◽  
Author(s):  
Shouren Huang ◽  
Yuji Yamakawa ◽  
Taku Senoo ◽  
Niklas Bergström
Keyword(s):  
High Speed ◽  
Industrial Robots ◽  
Dynamic Compensation

High speed wear testing of an abradable coating

Wear ◽  
2012 ◽  
Vol 294-295 ◽  
pp. 257-263 ◽  
Author(s):  
J. Stringer ◽  
M.B. Marshall
Keyword(s):  
High Speed ◽  
Wear Testing ◽  
Abradable Coating

scholarly journals Optimized Merging of Search Coil and Fluxgate Data for MMS

2016 ◽  
Author(s):  
David Fischer ◽  
Werner Magnes ◽  
Christian Hagen ◽  
Ivan Dors ◽  
Mark W. Chutter ◽  
...  
Keyword(s):  
High Speed ◽  
Signal To Noise Ratio ◽  
Model Development ◽  
Frequency Bands ◽  
Search Coil ◽  
Precise Knowledge ◽  
Combining Data ◽  
Unity Gain ◽  
Magnetospheric Multiscale Mission ◽  
Compensation Approach

Abstract. The Magnetospheric Multiscale mission (MMS) targets the characterization of fine scale current structures in the Earth's tail and magnetopause. The high speed of these structures, when traversing one of the MMS spacecraft, creates magnetic field signatures that cross the sensitive frequency bands of both search coil and fluxgate magnetometers. Higher data quality for analysis of these events can be achieved by combining data from both instrument types and using the frequency bands with best sensitivity and signal to noise ratio from both sensors. This can be achieved by a model based frequency 20 compensation approach which requires the precise knowledge of instrument gain and phase properties. We discuss relevant aspects of the instrument design, the ground calibration activities, describe the model development and explain the application on in-flight data. Finally, we show the precision of this method by comparison of inflight data. It confirms unity gain and a time difference of less than 100 μs between the different magnetometer instruments.

scholarly journals Wavelet Analysis of Experimental Blade Vibrations During Interaction With an Abradable Coating

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Romain Mandard ◽  
Jean-François Witz ◽  
Yannick Desplanques ◽  
Jacky Fabis ◽  
Jean Meriaux
Keyword(s):  
Wavelet Transform ◽  
Continuous Wavelet Transform ◽  
High Speed ◽  
Continuous Wavelet ◽  
High Speed Imaging ◽  
Blade Vibration ◽  
Time Frequency ◽  
Abradable Coating ◽  
Blade Vibrations ◽  
Blade Tip

Minimizing the clearance between turbofan blades and the surrounding casing is a key factor to achieving compressor efficiency. The deposition of an abradable coating on casings is one of the technologies used to reduce this blade-casing clearance and ensure blade integrity in the event of blade-casing contact. Aircraft in-service conditions may lead to interactions between the blade tip and the coated casing, during which wear of the abradable coating, blade dynamics, and interacting force are critical yet little-understood issues. In order to study blade/abradable-coating interactions of a few tens of milliseconds, experiments were conducted on a dedicated test rig. The experimental data were analyzed with the aim of determining the friction-induced vibrational modes of the blade. This involved a time-frequency analysis of the experimental blade strain using continuous wavelet transform (CWT) combined with a modal analysis of the blade. The latter was carried out with two kinds of kinematic boundary conditions at the blade tip: free and modified, by imposing contact with the abradable coating. The interaction data show that the blade vibration modes identified during interactions correspond to the free boundary condition due to the transitional nature of the phenomena and the very short duration of contacts. The properties of the continuous wavelet transform were then used to identify the occurrence of blade-coating contact. Two kinds of blade/abradable-coating interactions were identified: bouncing of the blade over short time periods associated with loss of abradable material and isolated contacts capable of amplifying the blade vibrations without causing significant wear of the abradable coating. The results obtained were corroborated by high-speed imaging of the interactions.

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