Measurement of radial expansion and tumbling motion of a high-speed rotor using an optical sensor system

Günther, Philipp; Dreier, Florian; Pfister, Thorsten; Czarske, J.; Haupt, T.; Hufenbach, W.

doi:10.1016/j.ymssp.2010.08.005

Cited by 30 publications

(16 citation statements)

References 16 publications

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“…M. Tancrez et al [9] present a new representation of the turbine performance maps oriented for turbocharger characterisation and it is said when using some representations of turbine maps in numerical simulations the uncertainties of the measurements can propagate very amplified to the final results, so it is very important to quantify them. In the work presented by P. Günther et al [10] the deformation and the movement of a high speed rotor is measured and the uncertainties involved are quantified. The authors suggest to calculate the propagation of uncertainties in order to understand how the results can be affected by the propagation effect.…”

Section: Introductionmentioning

confidence: 99%

Uncertainties in power computations in a turbocharger test bench

et al. 2015

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A specific study of the uncertainties of turbine power output measured in turbocharger test benches is presented using the law of uncertainty propagation and the influence of the different terms that contribute to it is shown. Then, non-linear mixed integer mathematical programming algorithms used with the turbine power uncertainty expression become an essential tool to overcome the problem of selection new sensors to improve an existing test rig or to contribute to a new one. A method of optimisation is presented for two different scenarios: first, where the maximum cost is a constraint; second where the maximum uncertainty is a constraint and the total cost is minimised. When using a large transducers database, computational efforts may be reduced by solving the relaxed non-integer problem by means of sequential quadratic programming and then probing the ceilings and floors of the parameters to get an optimum approximation with low costs. A comparison between the linear uncertainty propagation model and Monte Carlo simulations is also presented, only showing benefits of the later method when computing high order statistical moments of the turbine power output probability distribution.

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Section: Introductionmentioning

confidence: 99%

Uncertainties in power computations in a turbocharger test bench

et al. 2015

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“…If ℎ 1 ≥ , then point 2 should be identified as an outlier and removed. Then Step 2 is executed again with points 1 , 3 , and 4 . If ℎ 1 < , then go to Step 3.…”

Section: Elimination Of Outliersmentioning

confidence: 99%

“…An intersection curve between rotor helical surface and a given vertical plane of rotor axis is called rotor profile [1], which is an important standard to judge the quality of rotor and influences the performance of screw compressor directly. Because adjacent teeth of rotor with complicated structure overlap in space, an accurate and efficient measurement for rotor profile has been a practical puzzle in the industry and a hotspot in the academia [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A RE-Based Double Measurement Method for Unknown Rotor Profile of Screw Compressor

Yang

Xue

et al. 2014

Advances in Mechanical Engineering

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An accurate and efficient measurement for unknown rotor profile of screw compressor has been a nodus in the field of coordinate measuring machine (CMM) measurement because of its complexity of 3D helical surface, whose normal vectors vary with different measured points, while conventional 2D measuring methods have the inevitable radius compensation. If measured points and corresponding normal vectors are known, a 3D radius compensation then could be applied without a theoretical error. In this paper, a double-measurement method based on Reverse Engineering (RE) is proposed to solve this problem. The first measurement focused on constructing a 3D CAD model as accurate as possible. So, according to the structure characteristics of the unknown rotor, a reasonable WCS is established firstly. Then a DRCH method is presented to eliminate the outliers of measured points. Finally, an indirect method is presented to measure the screw pitch with projection and transformation of measured point sets. In second section, a 3D measurement is planned by DIMS language with setting measured points and corresponding normal vectors, which are calculated according to 3D CAD model constructed in first section. Final experimental analysis indicates that measuring accuracy with this double-measurement method is improved greatly.

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“…This shaft motion allows to know deeper the overall working conditions of the turbocharger and for this reason several techniques have been considered [9] [10] [11]. However, having to perform critical tests can result in the total destruction of the turbocharger and the sensors.…”

Section: Introductionmentioning

confidence: 99%

Behavior of an IC Engine Turbocharger in Critical Conditions of Lubrication

Galindo

Serrano

Dolz

et al. 2013

SAE Int. J. Engines

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Problems in the turbocharger lubrication system can cause serious deterioration in their overall performance and even their complete destruction. The paper describes several tests with different critical lubrication conditions, in order to determine the thresholds at which the operation may be appropriate. In an IC engine, these problems can be produced mainly by several factors: the decreasing in the supply pressure of the oil, a delay in the lubrication oil pressure and an intermittent lubrication interruption. A turbocharger test bench and an IC engine test bench has been used to test the turbocharger, in order to reproduce the conditions and cycles similar to the operation of the turbocharger in an IC engine (pressures, temperatures, mass flows, accelerations, etc..). Thermodynamic variables and mechanic variables measured in the tests help to identify some of the operating limits of lubrication in critical conditions. In addition, optical techniques have been combined with accelerometer measurements, in order to detect modifications in the movement of the turbocharger shaft. The main conclusions obtained from these tests are that accelerations from low rotational speed to 100krpm, without lubrication oil in the bearing system, don't cause significant problems in the turbocharger, for 20 sec. However, the accelerations to 150krpm can cause critical problems depending on the lubrication delay and the bearing configuration. Finally, higher acceleration rates to 200krpm, without lubrication, cause the turbocharger destruction in a few seconds. By other hand, a low oil inlet pressure given by an oil column, of about 1m in height, allows to the turbo survive during accelerations from low rotational speed to 150 krpm.

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Measurement of radial expansion and tumbling motion of a high-speed rotor using an optical sensor system

Cited by 30 publications

References 16 publications

Uncertainties in power computations in a turbocharger test bench

Uncertainties in power computations in a turbocharger test bench

A RE-Based Double Measurement Method for Unknown Rotor Profile of Screw Compressor

Behavior of an IC Engine Turbocharger in Critical Conditions of Lubrication

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