3D structure design of magnetic ferrite cores using gelcasting and           pressure-less sintering process

This paper reviews the recent development of 3D printing of biosamples, in terms of the 3D structure design, suitable printing technology, and available materials. Successfully printed 3D biosamples should possess the properties of high cell viability, vascularization and good biocompatibility. These goals are attained by printing the materials of hydrogels, polymers and cells, with a carefully selected 3D printer from the categories of inkjet printing, extrusion printing and laser printing, based on the uniqueness, advantages and disadvantages of these technologies. For recent developments, we introduce the 3D applications of creating scaffolds, printing cells for self-assembly and testing platforms. We foresee more bio-applications of 3D printing will be developed, with the advancements on materials and 3D printing machines.

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Dynamic Simulation Analysis on Flexible Assembling Fixture for Aircraft Panel Component

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.37-38.382 ◽

2010 ◽

Vol 37-38 ◽

pp. 382-385

Author(s):

Li Gang Qu ◽

Ke Qiang Pan ◽

Xin Chen

Keyword(s):

Dynamic Simulation ◽

Simulation Analysis ◽

Dynamic Theory ◽

3D Structure ◽

Structure Design ◽

Assembly Process ◽

Effective Solution ◽

Technical Approach ◽

Engineering Significance ◽

Equipment Performance

Flexible assembling fixture (FAF) is a new-style assembling equipment in assembly process of aircraft panel components, which is developed based on combination of digitization of assembling and automated modular fixture. The multi-actuator is designed to positioning and clamping the panel component. The dynamic behavior of the FAF is analyzed in process of 3D structure design. The motion and displacement of every actuator are analyzed based on kinematic and dynamic theory, by means of building the Knopoff model taking friction between the vice sport into account. ADAMS is employed to carry out the dynamic simulation. This technical approach is the effective solution for developing the new equipment; moreover, its result presents a great engineering significance in improving the equipment performance.

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Design and Simulation of Capacitive MEMS Switch for Ka Band Application

Wireless Communications and Mobile Computing ◽

10.1155/2021/2021513 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Vinay Bhatia ◽

Sukhdeep Kaur ◽

Kuldeep Sharma ◽

Punam Rattan ◽

Vishal Jagota ◽

...

Keyword(s):

Frequency Band ◽

Phase Shifter ◽

Rf Mems ◽

Dielectric Material ◽

Actuation Voltage ◽

3D Structure ◽

Structure Design ◽

High Resistivity ◽

Ka Band ◽

Mems Switch

In this paper, RF MEMS switch with capacitive contact is designed and analyzed for Ka band application. A fixed-fixed beam/meander configuration has been used to design the switch for frequency band 10 GHz to 40 GHz. Electromagnetic and electromechanical analysis of three-dimensional (3D) structure/design has been analyzed in multiple finite element method (FEM) based full-wave simulator (Coventorware and high-frequency structure simulator). A comparative study has also been carried out in this work. The high resistivity silicon substrate ( tan δ = 0.010 , ρ > 8 k Ω − cm , ε r = 11.8 ) with a thickness of 675 ± 25 μ m has been taken for switch realization. The designed structure shows an actuation voltage of around 9.2 V. Impedance matching for the switch structure is well below 20 dB, loss in upstate, i.e., insertion loss >0.5 dB, and isolation of >25 dB throughout the frequency band is observed for the aforesaid structure. Furthermore, to increase the RF parameters, AIN dielectric material has been used instead of SiO2 resulting in capacitance in downstate that increases hence improved the isolation. The proposed switch can be utilized in various potential applications such as any switching/tunable networks phased-array radar, reconfigurable antenna, RF phase shifter, mixer, biomedical, filter, and any transmitter/receiver (T/R) modules.

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Performance Enhancement of Flexible Piezoelectric Nanogenerator via Doping and Rational 3D Structure Design For Self‐Powered Mechanosensational System

Advanced Functional Materials ◽

10.1002/adfm.201904259 ◽

2019 ◽

Vol 29 (42) ◽

pp. 1904259 ◽

Cited By ~ 23

Author(s):

Yuanzheng Zhang ◽

Mengjun Wu ◽

Quanyong Zhu ◽

Feiyu Wang ◽

Huanxin Su ◽

...

Keyword(s):

Performance Enhancement ◽

3D Structure ◽

Structure Design ◽

Self Powered

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3D structure design and simulation for efficient particles capture: The influence of nanofiber diameter and distribution

Materials Today Communications ◽

10.1016/j.mtcomm.2020.100897 ◽

2020 ◽

Vol 23 ◽

pp. 100897 ◽

Cited By ~ 2

Author(s):

Jiajun Wu ◽

Obed Akampumuza ◽

Penghong Liu ◽

Zhenzhen Quan ◽

Hongnan Zhang ◽

...

Keyword(s):

3D Structure ◽

Structure Design ◽

Nanofiber Diameter

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Origami-Based Self-Folding Structure Design and Fabrication Using Projection Based Stereolithography

Journal of Mechanical Design ◽

10.1115/1.4029066 ◽

2015 ◽

Vol 137 (2) ◽

Cited By ~ 34

Author(s):

Dongping Deng ◽

Yong Chen

Keyword(s):

3D Structure ◽

Three Dimensional ◽

Experimental Tests ◽

Middle Layer ◽

Structure Design ◽

The Self ◽

Two Dimensional ◽

Polystyrene Film ◽

Folding Structure ◽

Unique Capability

Self-folding structures have unique capability such as reconfiguration during their usage. Such capability can be beneficial for a wide variety of applications including biomedical and electronics products. In this paper, a novel fabrication approach based on a three-dimensional (3D) printing process is presented for fabricating self-folding structures that can be actuated in a heating environment. The thermo-actuating structures that are designed and fabricated by our method are two-dimensional (2D) origami sheets, which have multiple printed layers. The middle layer of an origami sheet is a prestrained polystyrene film with large shrinkage ratios when heated. Both its top and bottom surfaces are covered with cured resin that is printed in designed shapes. A foldable hinge is achieved by constraining the shrinkage of the film on one side while allowing the shrinkage of the film on another side when the origami sheet is exposed to a heating environment. Heuristic models of hinge's folding angles are developed based on the related folding mechanism. A 2D origami sheet design and fabrication method is presented for a given 3D structure. Various experimental tests are performed to verify the self-folding performance of the designed and fabricated origami sheets. Techniques on improving folding angle control are also discussed with possible applications.

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An Origami Inspired Additive Manufacturing Process for Building Thin-Shell Structures

Volume 2A: Advanced Manufacturing ◽

10.1115/imece2013-65720 ◽

2013 ◽

Cited By ~ 2

Author(s):

Dongping Deng ◽

Yong Chen

Keyword(s):

Additive Manufacturing ◽

3D Structure ◽

Three Dimensional ◽

Experimental Tests ◽

3D Models ◽

Structure Design ◽

Fabrication Process ◽

Building Process ◽

2D Structure ◽

Input Model

Additive manufacturing (AM) process is widely used in fabricating three-dimensional (3D) models with complex internal features due to its flexibility and fast building speed. Inspired by the recent development of origami structures, we investigate a super-fast AM process for fabricating prototype models of hollow shapes. By combining the origami design and the additive manufacturing technology, a new fabrication process named Assembled Additive Manufacturing (AAM) is developed. A folding technique is used either during or after the layer-based fabrication process. By turning a 3D structure into a foldable two-dimensional (2D) structure, the fabrication speed is dramatically increased due to the decreased number of layers that is required in the building process. Detailed procedures of the AAM process such as unfolding algorithms of an input model, foldable structure design and folding mechanism are introduced in the paper. Experimental tests are also presented to illustrate the effective and efficiency of the AAM process.

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