A methodology for measuring and evaluating geometric errors of aero-engine blades based on genetic algorithm

Zhu, Zheng-Qing; Zhang, Yun; Chen, Zhitong; Jiang, Zepeng

doi:10.1177/0954405419840461

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…In addition, GA has the function of automatically searching the space and direction without additional constraints. 37 These properties of GA make it widely used in fixture layout optimization. 38,39 The detailed process of GA is as follows:…”

Section: Genetic Algorithmmentioning

confidence: 99%

Fixture layout optimization for car dashboard based on N-X locating principle

Liu

Sun

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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A fixture is a crucial component in the car dashboard manufacturing system and is used to position and restrain the car dashboard under external forces. However, the conventional fixture is only suitable for a specific type of car dashboard, which has poor adaptability. To this end, a new flexible fixture based on the N- X locating principle is proposed in this paper to adapt to different types of car dashboards. In the presented fixture, N clamping elements clamp the dashboard edge, while X movable supporting elements support the area close to the tool along the machining path. Furthermore, the fixture layout is optimized by combining a genetic algorithm (GA) and finite element analysis (FEA). In the optimization program, a multi-objective optimization function is established to suppress the deformation of the car dashboard. FEA is applied to calculate the machining deformation. The optimal locations of the fixture elements are determined by GA. A case is implemented to validate the proposed method and the results show that the maximum deformation and average deformation are reduced by 53.8% and 40%, respectively, compared with the empirical method.

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Section: Genetic Algorithmmentioning

confidence: 99%

Fixture layout optimization for car dashboard based on N-X locating principle

Liu

Sun

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…In surface oriented methods, a mesh can be reconstructed from point cloud directly, three points of the point cloud are firstly selected to create a facet, and a new point is continuously selected and inserted into the facet by using Delaunay Triangulation algorithm until the reconstruction is completed (Dong et al, 1996). To compensate probe radius errors for the measurement of aero-engine blades, an error separation-based compensation approach was proposed by using genic algorithm (Zhengqing et al, 2020). The existing construction algorithms can be used to reconstruct arbitrary geometries from the measurement data but most of them are low in reliability and robust.…”

Section: Introductionmentioning

confidence: 99%

Geometry error compensation using multiply laser sensors: a case study

Zhang,

2023

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PurposeA multi-laser sensors-based measurement instrument is proposed for the measurement of geometry errors of a differential body and quality evaluation. This paper aims to discuss the aforementioned idea.Design/methodology/approachFirst, the differential body is set on a rotation platform before measuring. Then one laser sensor called as “primary sensor”, is installed on the intern of the differential body. The spherical surface and four holes on the differential body are sampled by the primary sensor when the rotation platform rotates one revolution. Another sensor called as “secondary sensor”, is installed above to sample the external cylinder surface and the planar surface on the top of the differential body, and the external cylinder surface and the planar surface are high in manufacturing precision, which are used as datum surfaces to compute the errors caused by the motion of the rotation platform. Finally, the sampled points from the primary sensor are compensated to improve the measurement accuracy.FindingsA multi-laser sensors-based measurement instrument is proposed for the measurement of geometry errors of a differential body. Based on the characteristics of the measurement data, a gradient image-based method is proposed to distinguish different objects from laser measurement data. A case study is presented to validate the measurement principle and data processing approach.Research limitations/implicationsThe study investigates the possibility of correction of sensor data by the measurement results of multiple sensors to improving measurement accuracy. The proposed technique enables the error analysis and compensation by the geometric correlation relationship of various features on the measurand.Originality/valueThe proposed error compensation principle by using multiple sensors proved to be useful for the design of new measurement device for special part inspection. The proposed approach to describe the measuring data by image also is proved to be useful to simplify the measurement data processing.

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“…Geometric deviations of blades caused by manufacturing or assembly errors are typically minor compared to blade sizes. However, they have identifiable performance impacts, as shown by many authors [21][22][23][24][25][26][27]. Salehi et al [28] pointed out that it is generally difficult to characterise geometrical uncertainties in terms of probabilistic distribution functions, and in many engineering calculations, the geometrical uncertainty inputs are usually modelled using a normal distribution.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Geometric Errors of Throat Sizes of Last Stage Blades in a Mid-Size Steam Turbine

Eret¹,

Hoznedl²

2022

Journal of Machine Engineering

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Steam turbine technology with enhanced flexibility will continue to participate in electric power supply mixes. Last stage blades secure the reliability of a steam turbine and require high precision manufacturing and assembly. This case study presents a statistical analysis of geometric errors of the throat sizes of the last stage blades in a mid-size steam turbine. A 3D optical scanner is employed to capture detailed geometries of rotor blades and a half of assembled nozzle diaphragm. Unrolled cylinder cross-sections are used to evaluate 2D geometrical features such as blade throats and areas at three different diameters, and the results are compared to intended designs. In addition, linear correlations between the throat size and blade pitch, area and trailing edge thickness are established, and blade throat position shifts are quantified. Such a comprehensive study is presented for the first time, and some useful conclusions can be retrieved from this case study.

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A methodology for measuring and evaluating geometric errors of aero-engine blades based on genetic algorithm

Cited by 13 publications

References 19 publications

Fixture layout optimization for car dashboard based on N-X locating principle

Fixture layout optimization for car dashboard based on N-X locating principle

Geometry error compensation using multiply laser sensors: a case study

Analysis of Geometric Errors of Throat Sizes of Last Stage Blades in a Mid-Size Steam Turbine

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