CAD based shape optimization for gas turbine component design

Abstract

In order to improve product characteristics, engineering design makes increasing use of Robust Design and Multidisciplinary Design Optimisation. Common to both methodologies is the need to vary the object's shape and to assess the resulting change in performance, both executed within an automatic loop. This shape change can be realised by modifying the parameter values of a suitably parameterised Computer Aided Design (CAD) model. This paper presents the adopted methodology and the achieved results when performing optimisation of a gas turbine disk. Our approach to hierarchical modelling employing design tables is presented, with methods to ensure satisfactory geometry variation by commercial CAD systems. The conducted studies included stochastic and probabilistic design optimisation. To solve the multi-objective optimisation problem, a Pareto optimum criterion was used. The results demonstrate that CAD centric approach enables significant progress towards automating the entire process while achieving a higher quality product with the reduced susceptibility to manufacturing imperfections.

Reliability-based multidisciplinary design and optimization for twin-web disk using adaptive Kriging surrogate model

“…According to the concept of Brujic et al, 26 the developed parameterization method is shown in Figure 3.…”

Uncertainty and global sensitivity analysis of bladed disk statics with material anisotropy and root geometry variations

“…There are articles in the literature that deal with the optimization of the fir tree root joint geometry with the objective of reducing the stresses in the joint. [16][17][18][19][20][21] Random errors in manufacturing process introduce variability in the geometry of the blade root and the disk slots. Due to the variability in blade and disk geometry within the tolerance limits, the contact area at joints could be higher or lower than that of the nominal design geometry.…”

“…Meguid et al studied the effect of variation in certain key geometric features of the fir tree, such as the number of teeth, flank angle, and flank length, on von‐Mises stresses on disk slot. There are articles in the literature that deal with the optimization of the fir tree root joint geometry with the objective of reducing the stresses in the joint …”

Prometheus: A Geometry-Centric Optimization System for Combustor Design

“…While such techniques succeed in automating the design process to some extent, thereby reducing both develop-FIGURE 1. A TRADITIONAL OPTIMIZATION WORKFLOW ment costs and time-to-market, some human interaction in the creation of such optimization workflows is unavoidable [4,5] and can be quite time consuming when developing a workflow to cope with complex topology changes.…”