scholarly journals Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

2021 ◽  
Vol 11 (22) ◽  
pp. 10630
Author(s):  
Kai Zhang ◽  
Hemeng Qu ◽  
Haijun Guan ◽  
Jizhen Zhang ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Complex Structure ◽  
Glass Ceramics ◽  
Fused Silica ◽  
Structure Design ◽  
Design Methods ◽  
Powder Materials ◽  
Fabrication Technology ◽  
The Common ◽  
New Generation

In recent years, much progress has been made on the development of metal mirrors based on additive manufacturing (AM). The sandwich mirror is well known for its excellent mechanical properties and challenging machining. Now, AM can be used to fabricate this complex structure and reduce the processing time and cost. In addition, with the aid of some new design methods for additive manufacturing, such as lattice, topology optimization (TO), and Voronoi, the freedom of mirror structure design is enormously improved. The common materials of mirrors include ceramics (SiC), glasses (glass ceramics, fused silica), and metals (aluminum, beryllium). Among them, the AM technology of metals is the most mature and widely used. Researchers have recently extensively developed the new-generation metal mirror to improve performance and lightweight rate. This review focuses on the following topics: (1) AM technologies and powder materials for metal mirrors, (2) recent advances in optomechanical design methods for AM metal mirrors, (3) challenges faced by AM metal mirrors in fabricating, and (4) future trends in AM metal mirrors.

Integration of Topological and Functional Optimization in Design for Additive Manufacturing

2014 ◽  
Author(s):  
Yunlong Tang ◽  
Jean-Yves Hascoet ◽  
Yaoyao Fiona Zhao
Keyword(s):  
Additive Manufacturing ◽  
Design Method ◽  
Complex Structure ◽  
Structure Design ◽  
Design Methods ◽  
Topological Optimization ◽  
Future Research ◽  
Focused Attention ◽  
Traditional Design ◽  
Gradient Density

Additive manufacturing (AM) technologies has brought unprecedented freedom to the fabrication of functional parts with high complex, multi-material and gradient density structure. However, currently only traditional design methods are available for AM design process, which do not take full advantage of AM capabilities. Therefore, a new design method with the consideration of all aspects of AM advantages is urgently in need. A detailed literature review on traditional design methods is presented with focused attention on the potential of using these methods to design functional parts for additive manufacturing processes. Based on thorough understanding and comparison of current structure design methods, a new design approach that integrates topological and functional optimizations for AM products is presented. With this method, an essential link is established between topological optimization result and various functional parameters of complex structure. Parts can be designed in multi levels for multi functions simultaneously. This design method provides an important foundation for future research on designing AM products with improved multiple functions and optimized topology.

Research Progress of Extended-Reach Well Antifriction Technology

2013 ◽  
Vol 868 ◽  
pp. 638-644
Author(s):  
Hui Zeng Zhang ◽  
Zhi Chuan Guan ◽  
Yu Qiang Xu ◽  
Qian Deng Li ◽  
Ling Chao Xuan
Keyword(s):  
Large Deviation ◽  
Complex Structure ◽  
Drill Pipe ◽  
Drill String ◽  
Field Application ◽  
Structure Design ◽  
Research Progress ◽  
Working Principle ◽  
The Common ◽  
Extended Reach Well

There is a remarkable friction between drill string and borehole in extended-reach wells and horizontal wells due to large deviation angle, contact between drill string and borehole, non-rotation of drill string. The large friction and torque will induce blocked bit weight, low ROP, constrained drill string extension. This article summarizes the common used antifriction methods and tools in extended-reach wells, focusing on Non-Rotation Drill Pipe Protector (NRDPP), roller antifriction tools and vibration antifriction tools. The working principle, structure design, performance and field application of which are introduced. With the increasing numbering of complex structure wells which include extended-reach well and horizontal well, antifriction technology has broad prospects for development.

scholarly journals A Proposal of Concrete Structure Design Methods Considering Environmental Performance

2005 ◽  
Vol 3 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Kenji Kawai ◽  
Takafumi Sugimaya ◽  
Koichi Kobayashi ◽  
Susumu Sano
Keyword(s):  
Environmental Performance ◽  
Concrete Structure ◽  
Structure Design ◽  
Design Methods

Computer Aided Design of Transmission Components of Liquid Stirred Tank

2011 ◽  
Vol 109 ◽  
pp. 711-714
Author(s):  
Ying Jiang ◽  
Jie Liu
Keyword(s):  
Computer Aided Design ◽  
Automatic Generation ◽  
Structure Design ◽  
Stirred Tank ◽  
Design System ◽  
Design Requirement ◽  
Design Efficiency ◽  
The Common ◽  
Aided Design ◽  
Develop System

Secondary develop system can realize design automation of the common parts, so that software system can automatically inquire the chart and get data, then this could really release design personnel and improve the design efficiency. By secondary develop system of stirred tank users can respectively carry on the design according to their own needs. So secondary develop system has the function of automatic generation graphics, and can generate CAD drawings complying with the design requirement, so it reflected the intelligent performance of the design system. Secondary develop system is able to complete the automatic design of common parts, and can greatly improve the quality and efficiency of design, so it has very important use value. This design realizes the function of automatic graphics generation of transmission of stirred tank, and can generate structure design of common belt wheel.

Structure Design and Analysis for the Spacecraft On-Orbit Replacement Unit (ORU)

2013 ◽  
Vol 437 ◽  
pp. 449-453 ◽  
Author(s):  
Xi Zhai ◽  
Xin Hong Li ◽  
Si Yin Zhou
Keyword(s):  
Complex Structure ◽  
Structure Design ◽  
Module Structure ◽  
Assembly Technology ◽  
Universal Structure ◽  
Module Structures

By using on-orbit replacement and assembly technology, some fresh ideas and methods for the design, produce and application of spacecraft were put forward. Universal structure is one of the most basic requirements of On-Orbit replacement, assembly. Module structure must obey the rules of the Operationally Responsive Space (ORS). According to the degree of spacecraft module division, two module structures were proposed, and the complex structure was analyzed to verify the correctness of it.

scholarly journals Advances in 3D Printing for Tissue Engineering

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3149
Author(s):  
Angelika Zaszczyńska ◽  
Maryla Moczulska-Heljak ◽  
Arkadiusz Gradys ◽  
Paweł Sajkiewicz
Keyword(s):  
Tissue Engineering ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Complex Structure ◽  
Three Dimensional ◽  
Computer Assisted ◽  
Scaffold Fabrication ◽  
Manufacturing Techniques ◽  
Printing Techniques ◽  
State Of Art

Tissue engineering (TE) scaffolds have enormous significance for the possibility of regeneration of complex tissue structures or even whole organs. Three-dimensional (3D) printing techniques allow fabricating TE scaffolds, having an extremely complex structure, in a repeatable and precise manner. Moreover, they enable the easy application of computer-assisted methods to TE scaffold design. The latest additive manufacturing techniques open up opportunities not otherwise available. This study aimed to summarize the state-of-art field of 3D printing techniques in applications for tissue engineering with a focus on the latest advancements. The following topics are discussed: systematics of the available 3D printing techniques applied for TE scaffold fabrication; overview of 3D printable biomaterials and advancements in 3D-printing-assisted tissue engineering.

THE ESSENCE OF MODERN TERRORISM AND THE DEVELOPMENT OF COMPREHENSION OF THE NATURE OF TERRORISM

2021 ◽  
Vol 17 (1) ◽  
pp. 155-161
Author(s):  
Petar MARINOV
Keyword(s):  
Complex Structure ◽  
Economic Situation ◽  
The Political ◽  
Dynamic Phenomenon ◽  
Individual Country ◽  
Common Features ◽  
Left And Right ◽  
The Common ◽  
Specialized Institution

Abstract: Terrorism as a phenomenon has a complex structure in which ideological, social, religious, ethnic, psychological and other elements are intertwined. Modern terrorism is a complex and dynamic phenomenon that successfully adapts to the political and economic situation. Effective counteraction is beyond the power of any independent specialized institution or individual country. Understanding of the concept of terrorism is linked to the analysis of the common features of modern terrorism. Based on the content of ideology and motivation, as well as the specifics of the methods of action, there are differences between terrorism based on left and right ideologies, on nationalism and separatism, and with different religious motivations.  

Automation of seismic design of high-rise structure with braced steel frame

2021 ◽  
Author(s):  
Xin Zhao ◽  
Gang Wang ◽  
Jinlun Cai ◽  
Junchen Guo
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Structural Design ◽  
Structure Design ◽  
Steel Frame ◽  
Design Methods ◽  
Automatic Design ◽  
Component Level ◽  
Design Algorithm ◽  
High Rise

<p>With the continuous development and progress of society, the structure of high-rise buildings has been paid more and more attention by the engineering community. However, the existing high- rise structure design methods often have a lot of redundancy and have a lot of room for optimization. Most of the existing seismic design methods of high-rise structures are based on engineering experience and manual iterative methods, so that the efficiency of design can not meet the needs of the society. if the method of design automation is adopted, the workload of designers can be greatly reduced and the efficiency of structural design can be improved. Based on the digital modeling theory, this paper proposes a MAD automatic design algorithm, in which the designer provides the initial design of the structure, and the algorithm carries out the modeling, analysis, optimization and design of each stage of the structure, and finally obtains the optimal structure. The structural design module of this algorithm starts from the component level, when the component constraint design meets the limit requirements of the specification, it enters and completes the component constraint design and the global constraint design of the structure in turn. In this paper, taking a ten-story braced steel frame high-rise structure as an example, the optimal design is carried out, and its seismic performance is analyzed. the results show that the MAD automatic design algorithm can distribute the materials to each part reasonably, which can significantly improve the seismic performance of the structure and realize the effective seismic design.</p>

Innovative Design, Structural Optimization and Additive Manufacturing of New-Generation Turbine Blades

2021 ◽  
pp. 1-31
Author(s):  
Lorenzo Pinelli ◽  
Andrea Amedei ◽  
Enrico Meli ◽  
Federico Vanti ◽  
Benedetta Romani ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Structural Optimization ◽  
Turbine Blade ◽  
Turbine Blades ◽  
Topological Optimization ◽  
Mode Shapes ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
New Generation

Abstract The need for high performances is pushing the complexity of mechanical design at very high levels, especially for turbomachinery components. Structural topology optimization methods together with additive manufacturing techniques for high resistant alloys are considered very promising tools, but their potentialities have not been deeply investigated yet for critical rotating components like new-generation turbine blades. This research work proposes a methodology for the design, the optimization and the additive manufacturing of extremely stressed turbomachinery components like turbine blade-rows. The presented procedure pays particular attention to important aspects of the problems as fluid-structure interactions and fatigue of materials, going beyond the standard structural optimization approaches found in the literature. The numerical procedure shows robustness and efficiency, making the proposed methodology a good tool for rapid design and prototyping, and for reducing the design costs and the time-to-market typical of these mechanical elements. The procedure has been applied to a low-pressure turbine rotor to improve the aeromechanical behavior while keeping the aerodynamic performance. From the original geometry, mode-shapes, forcing functions and aerodynamic damping have been numerically evaluated and are used as input data for the following topological optimization. Finally, the optimized geometry has been verified in order to confirm the improved aeromechanical design. After the structural topology optimization, the final geometries provided by the procedure have been then properly rendered to make them suitable for additive manufacturing. Some prototypes of the new optimized turbine blade have been manufactured to be tested in terms of fatigue.

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