Results 41 to 50 of about 690,112 (296)

Error modeling and tolerance design of a parallel manipulator with full-circle rotation

Advances in Mechanical Engineering, 2016
A method for improving the accuracy of a parallel manipulator with full-circle rotation is systematically investigated in this work via kinematic analysis, error modeling, sensitivity analysis, and tolerance allocation. First, a kinematic analysis of the
Yanbing Ni, Cuiyan Shao, Biao Zhang, Wenxia Guo   +3 more
doaj   +1 more source

A Hybrid Tolerance Design Method for the Active Phased-Array Antenna

Applied Sciences, 2020
With the increase of the working frequency of the array antenna, tolerance design has become increasingly important. The state-of-art tolerance design methods mainly deal with the position tolerance of the discrete elements. However, the geometric errors
Guodong Sa, Zhenyu Liu, Chan Qiu, Jianrong Tan   +3 more
doaj   +1 more source

Reliability-based tolerance redesign of mechanical assemblies using Jacobian-Torsor model

Science Progress, 2021
The purpose of this paper is to present a new method to redesign dimensional and geometric tolerances of mechanical assemblies at a lower cost and with higher reliability.
Bingxiang Wang, Xianzhen Huang, Miaoxin Chang   +2 more
doaj   +1 more source

Distinct Microstructural Characteristic Lengths Defining Notch Fatigue Crack Initiation and Propagation, and Defect Tolerance in Advanced Steels

Advanced Engineering Materials, EarlyView.
Schematic representation of modes of microcrack nucleation, growth and temporary arrestment at different boundaries, with the criteria for crack propagation in three scenarios: (1) large notch, (2) defect/small sharp notch, and (3) long crack. This work revisits and integrates results on the fatigue behavior of advanced bainitic steels (in particular ...
Lucia Morales‐Rivas
wiley   +1 more source

Educational tasks for teaching of geometric tolerances

, 2021
The bachelor’s thesis is divided into two main parts. The first one is a theoretical part and it clarifies the basics of geometric tolerancing. The second one is practical and it uses the knowledge gained from the first part to show how geometric ...
Hanáček, Lukáš
core   +1 more source

Optimization of 3D Tolerance Design Based on Cost–Quality–Sensitivity Analysis to the Deviation Domain

Automation, 2023
Under the new geometric product specification (GPS), a two-dimensional chain cannot completely guarantee quality of the product. To optimize the allocation of three-dimensional tolerances in the conceptual design stage, the geometric variations of the ...
Kaili Yang, Yi Gan, Yanlong Cao, Jiangxin Yang, Zijian Wu   +4 more
doaj   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

Geometric Benchmarking of Metal Material Extrusion Technology: A Preliminary Study

Applied Sciences
Metal additive manufacturing technologies such as powder bed fusion (PBF) and direct energy deposition (DED) are experiencing fast development, due to the growing awareness of industries.
Gabriele Locatelli, Mariangela Quarto, Gianluca D’Urso, Claudio Giardini   +3 more
doaj   +1 more source

Thermal Cycle–Microstructure–Property Relationships in Rail Steel Heat‐Affected Zone Simulated by Gleeble

Advanced Engineering Materials, EarlyView.
Microstructural evolution of premium rail steel during flash butt welding (FBW), comparing physically simulated heat‐affected zones with actual weld regions. Thermal cycles induce phase transformations and microstructural heterogeneity that influence weld quality and mechanical performance. These findings provide insights into optimizing FBW parameters
Emmanoelle Cintra da Cunha Araújo, João Marcos da Silva Nunes, Marcelly Cristiny Nunes de Carvalho, Alex Rojas, Cristie Luis Kugelmeier, Cristhian Ricardo Loayza Loayza, João Carlos Ferreira, Maria Veronica Goncalves Rodrigues, Rute Sayuri Kano, Isaac Araújo Furtado, Jacyara Dalylla da Silva Nunes, Jhonatan Peres de Sousa, Marcos Natan da Silva Lima, Eden Santos Silva, Gedeon Silva Reis, Samuel Filgueiras Rodrigues   +15 more
wiley   +1 more source

Unified reference system for geometric characteristics dimensional elements of details. Part II. Geometric characteristics of cylindrical elements of parts

Омский научный вестник
The unified reference system for the geometric characteristics of the part is the Cartesian rectangular coordinate system, which is materialized by sets of design datums that limit the part to six degrees of freedom: three linear and three angular.
V. I. Glukhov, L. G. Varepo
doaj   +1 more source