Papers by Keyword: Alignment

Abstract: Predicting the deformation behavior of rolled and extruded light metal alloys is a challenging task. Due to the high cost of experimental analysis, finite element simulations are often required. A variety of material models at different scales are available for practical use. In this work, the viscoplastic self-consistent (VPSC) approach is employed to consider microstructural effects. These can be incorporated by using measured crystal sizes and orientations - called texture - of the alloy under consideration. For each integration point in the FE mesh, a corresponding texture is assigned and individually deformed in LS-Dyna^®, where VPSC is implemented as a user-defined material model - referred to as FE-VPSC. This study focuses on preprocessing of texture data as well as their compression for accurate and faster FE simulations. For verifying the simulations, a comparison with digital image correlation (DIC) of experimental puncture tests was conducted.

Abstract: Additive manufacturing processes offer the ability to manufacture highly complex geometries, but are limited in terms of the achievable surface quality. These limitations are based on physical restrictions, especially the need of support and the powder-bed environment, and economic decisions. In this study, the development of the morphology of surfaces with varying inclination angles was investigated on the example of 316L stainless steel. Surfaces with low inclination angles to the manufacturing plane suffered extensively from the process related staircase effect, whereas perpendicular side faces revealed high dependencies on the interaction with the powder-bed.

Abstract: Recent investigations revealed major fluctuations in the material properties of selective laser melted AlSi10Mg, which corresponded with the varying precipitation-hardening state of the microstructure, caused by the differing dwell times at elevated temperatures. It was indicated that a subsequent heat treatment balances the age-hardening and results in a homogenized material strength. In order to further investigate this statement selective laser melted AlSi10Mg samples were subject to multiple post-heat-treatments. Subsequently, the surface hardness and tensile strength was determined and compared with the as-built results. The post-heat-treatment led to an arbitrary occurrence of rupture, indicating a successful homogenization, coupled with a remarkable improvement in ductility, but to the costs of a lowered tensile strength, which was highly dependent on the chosen heat-treatment procedure.

Abstract: This template explains and describes how to machining some holes with various of axis distance. Use Roundtest RA – 120 was measured and alignment and subsequently calculated the distance of the holes.

Abstract: A quasiclassical trajectory calculation is carried out to investigate the effect of reagent rotational excitation on product rotational polarization in the reactions Li + TF(v=0, j=0-5) → LiF + T. It is found that the reagent rotational excitation slightly effect the product rotational alignment. However, the product rotational orientation becomes stronger and stronger with the increase of the reagent rotational quantum number from j=0 to j=5. The reaction mechanism for the title reactions changes from direct for j=0-1 to indirect for j=2-5.

Abstract: By applying the model in a case, two methods of linear and curved alignment are analyzed and compared. Besides, the main existing problems and the solutions to solve them are studied. The results show that curved alignment method has obvious advantages in highway design, interchange design, and other complex terrain conditions. With a variety of computer-aided design software line appears, curved alignment method will be widely used.

Abstract: The rheology of nanowires (NWs) and nanotubes (NTs) in shear flow has been analyzed by molecular dynamics (MD) simulation and macrofludic simulation. A method based on macrofludic system for aligning NWs and NTs is demonstrated. In this method, vortex is generated near the surface of a plane by using a mushroom like turnplate. Then a uniform velocity gradient was generated on the surface of the plane. Through controlling the rotational speed of the turnplate, the rheology of NWs and NTs in suspension can be easily controlled. So it provides a more effective and economical method for the alignment of NWs and NTs, as well as forming the anisotropy NWs and NTs bulk material.

Abstract: In this article are compared two ways of measuring axial hole distance. The first method was implemented for measuring equipment Roudtest RA 120. The second method was implemented on the device Thome Präcision.

Abstract: Based on the review of related literature about the alignment of new product development (NPD) and supply chain (SC), the related decision variables of NPD and SC are summarized. In order to explore the alignment relationship between NDP and SC, we propose a study framework and the some relationship assumptions. Taking use of questionnaire investigation and Structural Equation Modeling, the relevant assumptions are verified and the mechanism and strategy of the alignment of NPD and SC are explored for Chinese manufacturing enterprises. The research result shows that the modularity and variety of NPD have close relationship with the complexity of supply chain configuration, collaboration and coordination. And the degree of the alignment has an important influence on the supply chain performance of the end product. The relevant conclusions would provide some theoretical reference and practical guidance on the decision of aligning the NPD with SC.

Abstract: This paper proposes a novel nonlinear alignment method for the strapdown inertial navigation system (SINS). The method uses the simplified cubature Kalman filter (CKF) and velocity matching. The system equations are the navigation equation, the Euler angle differential equations and the inertial sensor measurement error models. The system equations are nonlinear, whereas the measurement equations are linear. The CKF is simplified under the condition of the linear measurement equations. The time updating cycle and measurement updating cycle are different. Finally inertial measurement unit experimental data are used to do alignment. The results show that the proposed method can effectively obtain an accurate initial attitude within a short time, thus also be considered a new and simple addition to the kit of solutions for SINS alignment.