Uncertainties in Compressor and Aircraft Design

Büche, Dirk; Klostermann, Sönke; Rogé, Gilbert; Loyatho, X.

doi:10.1007/978-3-319-77767-2_3

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Following (Büche et al, 2019) the norm relevant to general manufacturing tolerances (ISO 2768(ISO -1, 1989) is used to illustrate the principle. Table 1 shows the permissible tolerances in (mm) for four different tolerance classes from "fine" to "very coarse".…”

Section: Derivation Of Manufacturing Uncertainty From Technical Normsmentioning

confidence: 99%

“…But what are the options for custom built machines, where the sample size will never be sufficiently high for the task of characterization of input uncertainties? A possible path to the characterization of manufacturing input uncertainties is described in (Büche et al, 2019) and adopted here. It is based on deriving input uncertainties from technical norms that determine the general tolerances in manufacturing such as ISO 2768ISO -1 (1989.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of manufacturing uncertainties with applications to uncertainty quantification and robust design optimization

Wünsch¹,

Hirsch

2021

J. Glob. Power Propuls. Soc.

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Methodologies to quantify the impact of manufacturing uncertainties in 3D CFD based design strategies have become increasingly available over the past years as well as optimization under uncertainties, aiming at reducing the systems sensitivity to manufacturing uncertainties. This type of non-deterministic simulation depends however strongly on a correct characterization of the manufacturing variability. Experimental data to characterize this variability is not always available or in many cases cannot be sampled in sufficiently high numbers. Principal Component Analysis (PCA) is applied to the sampled geometries and the influence of tolerances classes, sample size and number of retained deformation modes are discussed. It is shown that the geometrical reconstruction accuracy of the deformation modes and reconstruction accuracy of the CFD predictions are not linearly related, which has important implications on the total geometrical variance that needs to be retained. In a second application the characterization of manufacturing uncertainties to a marine propeller is discussed. It is shown that uncertainty quantification and robust design optimization of the marine propeller can successfully be performed on the basis of the derived uncertainties. This leads to a propeller shape that is less sensitive to the manufacturing variability and therefore to a more robust design.

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Section: Derivation Of Manufacturing Uncertainty From Technical Normsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of manufacturing uncertainties with applications to uncertainty quantification and robust design optimization

Wünsch¹,

Hirsch

2021

J. Glob. Power Propuls. Soc.

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show abstract

The acceptable range of roughness instrument calibration factor

Rahman

Alfiyati

Novyanto

et al. 2021

J. Phys.: Conf. Ser.

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There were no studies that show an acceptable range of calibration factor value on precision surface roughness instruments. It is generally known that the calibration factor plays an essential role in precision surface roughness instruments. This study demonstrates the acceptability range for the calibration factor using the Shewhart control chart method. Calibration factor data were obtained by comparing the calibration certificate of a type A artifact with the measurement results obtained from a surface roughness instrument. During the last five years, the calibration factor data from the Talysurf i120 surface roughness machine were analysed using the Shewhart control chart to determine the lower (LCL) and upper control limits (UCL) the range of acceptability. The results showed that the acceptance range was between 0.849 and 1.041, with a doubt level of 1%. These results are expected to be useful for metrologists, industries, and surface roughness practitioners in general to analyse the reliability of their surface roughness instruments/profilometer.

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High-quality net shape geometries from additively manufactured parts using closed-loop controlled ablation with ultrashort laser pulses

Holder

Leis

Buser

et al. 2020

Advanced Optical Technologies

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Additively manufactured parts typically deviate to some extent from the targeted net shape and exhibit high surface roughness due to the size of the powder grains that determines the minimum thickness of the individual slices and due to partially molten powder grains adhering on the surface. Optical coherence tomography (OCT)-based measurements and closed-loop controlled ablation with ultrashort laser pulses were utilized for the precise positioning of the LPBF-generated aluminum parts and for post-processing by selective laser ablation of the excessive material. As a result, high-quality net shape geometries were achieved with surface roughness, and deviation from the targeted net shape geometry reduced by 67% and 63%, respectively.

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Uncertainties in Compressor and Aircraft Design

Cited by 3 publications

References 6 publications

Characterization of manufacturing uncertainties with applications to uncertainty quantification and robust design optimization

Characterization of manufacturing uncertainties with applications to uncertainty quantification and robust design optimization

The acceptable range of roughness instrument calibration factor

High-quality net shape geometries from additively manufactured parts using closed-loop controlled ablation with ultrashort laser pulses

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