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 2016-05-14

Evaluation of the tolerance zone using discrete measured points plays a critical role in today’s metrology and industrial applications. The deviation zone is typically evaluated using a fitting method that fits an ideal desired geometry to locate measured points while a function of the Euclidean distances of the measured points to the ideal surface becomes minimum. This paper presents a quick and reliable algorithm called Dynamic Principle Component Alignment (DPCA) for fitting complex surfaces to the coordinate metrology sample points using the information that is dynamically generated by Principal Component Analysis (PCA) of the measurement data and the corresponding fitted geometry.

 2015-12-12

This paper presents a new application framework for aerodynamics-based shape optimization of passenger cars. The rear geometry of a passenger car is the focus of this study due to its significant influence on the aerodynamic characteristics of vehicles.

 2015-12-01

In order to comprehend an entire surface's deviation zone, infinite measured points are required. Using the common measurement techniques through coordinate metrology, a limited number of surface actual points can be acquired. However, the obtained points would not provide sufficient information to examine the geometry thoroughly. A novel approach to predict surface behaviour via Distribution of Geometric Deviations (DGD) is examined in this paper.

 2015-09-29

A novel procedure for the nonlinear vibration analysis of a curved beam is presented. The Non-Uniform Rational B-Spline (NURBS) is combined with the Euler−Bernoulli beam theory to define the curvature of the structure. The governing equation of motion and the general frequency formula, using the NURBS variables, is applicable for any type of curvatures, is developed.

 2015-10-01

This paper aims to propose a global adaptive direct slicing technique of Non-Uniform Rational B-Spline (NURBS)-based sculptured surface for rapid prototyping where the NURBS representation is directly extracted from the computer-aided design (CAD) model.

 2015-09-01

Surface integrity is a crucial issue that needs to be improved in the additive manufactured products. Precise evaluation of surface integrity demands a detailed understanding of the surface behaviour. Optical surface and roughness measurement sensors only provide information on the discrete points measured from the manufactured surface without the details of the surface topography. Throughout this paper, a methodology is developed to approximate the surface behaviour.

 2015-09-01

Additive manufacturing and topological optimization are two key technologies that have good symbiosis. Several issues have been solved in the area of both technologies. Additive manufacturing relaxes the design constraints related to the manufacturability of a part. A diesel engine support is topologically optimized.

 2015-09-01

Most commonly used Additive manufacturing (AM) technologies are developed based on a layered manufacturing process to fabricate 3D models. However, a critical drawback that reduces the surface quality of the AM parts is the staircase effect as a direct result of the layered deposition of the material. The final surface roughness of the products has been a key problem in AM. In this paper, a new approach to model surface roughness in Fused Deposition Modeling (FDM) is proposed.

 2014-10-24

Inspection of surface integrity in additive manufacturing (AM) parts essentially needs a detailed understanding of their actual surface topography. Today's optical surface topography and roughness measurement sensors only provide information on the discrete points measured from the manufactured surface and not a detailed reconstruction of the surface topography. This paper presents a finite difference approach for reconstruction of the surface topography using sample measured data points.

 2014-07-10

A methodology is presented in this work that employs the active inverted wings to enhance the road holding by increasing the downward force on the tyres. In the proposed active system, the angles of attack of the vehicle's wings are adjusted by using a real-time controller to increase the road holding and hence improve the vehicle handling.