scholarly journals Evaluation of Lateral and Vertical Dimensions of Micromolds Fabricated by a PolyJet™ Printer

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 302
Author(s):  
Sindhu Vijayan ◽  
Pravien Parthiban ◽  
Michinao Hashimoto
Keyword(s):  
Experimental Data ◽  
Mathematical Models ◽  
Computer Aided Design ◽  
Microfluidic Devices ◽  
Maximum Deviation ◽  
Model Framework ◽  
Computer Aided ◽  
3D Printers ◽  
Experimental Findings ◽  
Aided Design

PolyJet™ 3D printers have been widely used for the fabrication of microfluidic molds to replicate castable resins due to the ease to create microstructures with smooth surfaces. However, the microstructures fabricated by PolyJet printers do not accurately match with those defined by the computer-aided design (CAD) drawing. While the reflow and spreading of the resin before photopolymerization are known to increase the lateral dimension (width) of the printed structures, the influence of resin spreading on the vertical dimension (height) has not been fully investigated. In this work, we characterized the deviations in both lateral and vertical dimensions of the microstructures printed by PolyJet printers. The width of the printed structures was always larger than the designed width due to the spreading of resin. Importantly, the microstructures designed with narrow widths failed to reproduce the intended heights of the structures. Our study revealed that there existed a threshold width (wd′) required to achieve the designed height, and the layer thickness (a parameter set by the printer) influenced the threshold width. The thresholds width to achieve the designed height was found to be 300, 300, and 500 μm for the print layer thicknesses of 16, 28, and 36 μm, respectively. We further developed two general mathematical models for the regions above and below this threshold width. Our models represented the experimental data with an accuracy of more than 96% for the two different regions. We validated our models against the experimental data and the maximum deviation was found to be <4.5%. Our experimental findings and model framework should be useful for the design and fabrication of microstructures using PolyJet printers, which can be replicated to form microfluidic devices.

A Multi-User Computer-Aided Design Competition: Experimental Findings and Analysis of Team-Member Dynamics

2017 ◽  
Vol 17 (3) ◽  
Author(s):  
Brett Stone ◽  
John Salmon ◽  
Keenan Eves ◽  
Matthew Killian ◽  
Landon Wright ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Value Added ◽  
Future Research ◽  
Calendar Time ◽  
Competition Analysis ◽  
Computer Aided ◽  
Design Competition ◽  
Purdue Spatial Visualization Test ◽  
Experimental Findings ◽  
Aided Design

A competition for teams of three students using a prototype multi-user computer-aided design (MUCAD) tool was held to investigate various hypotheses regarding the performance of teams in such a setting. By comparing models from the competition to the same model in a single-user CAD environment, it is seen that use of a MUCAD system can significantly increase the value-added per unit of calendar time for a modeling effort. An investigation was also made into the causes of the performance differences among the various MUCAD teams which participated in the competition. Analysis of the results shows that teams that encouraged effective forms of communication and teams whose members scored similarly on the Purdue Spatial Visualization Test: Visualization of Rotations (PSVT:R) performed better than other teams. Areas of future research in analyzing teams in MUCAD environments are suggested.

Further Investigation of Multifacet Drills (MFD’s)—Mathematical Models, Methods of Grinding, and Computer Plotting

1984 ◽  
Vol 106 (4) ◽  
pp. 313-324 ◽  
Author(s):  
L. H. Chen ◽  
S. M. Wu
Keyword(s):  
Mathematical Models ◽  
Computer Aided Design ◽  
Coordinate Transformations ◽  
Geometric Characteristics ◽  
Computer Aided ◽  
Aided Design ◽  
Geometric Elements ◽  
Future Work

The geometric characteristics of nine representative Multifacet Drills (MFD’s) are summarized. Mathematical models of the various component surfaces are derived and analyzed using coordinate transformations. The mathematical models of the geometric elements are used to deduce appropriate grinding methods. Computer plots of MFD’s are also presented to check the mathematical models and to lay a foundation for future work on computer-aided design (CAD) of MFD’s.

Simulation of Wave-Maritime Structure Interactions by Using a Numerical Wave Flume

2012 ◽  
Vol 588-589 ◽  
pp. 1376-1379
Author(s):  
Qin Jiang ◽  
Chang Kuan Zhang
Keyword(s):  
Experimental Data ◽  
Computer Aided Design ◽  
Design Tool ◽  
Coastal Protection ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Computer Aided ◽  
Numerical Wave ◽  
Aided Design ◽  
Protection Structures

A numerical wave flume (CADMAS-SURF/2D) developed on the basis of NASA-VOF technique is used to simulate interactions between waves and maritime structures in order to verify its feasibility to maritime structure designs. Examinations and comparisons of the calculated results of wave impacts on typical maritime structures, such as caisson-type and composite breakwaters, with experimental data indicate that the numerical wave flume can be an effective computer aided design tool for the designs of coastal protection structures.

scholarly journals Mathematical Modelling and Computer Simulation Assist in Designing Non-traditional Types of Precipitators and Separators

2018 ◽  
Vol 8 (1) ◽  
pp. 441 ◽  
Author(s):  
Milan Bernat ◽  
Jaroslav Džmura ◽  
Renáta Bernátová ◽  
Ľubomr Žáčok ◽  
Jan Pavlovkin
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Computer Simulation ◽  
Computer Aided Design ◽  
Theoretical Calculations ◽  
Electrostatic Separation ◽  
Design Engineers ◽  
Computer Aided ◽  
Aided Design ◽  
Advanced Computer

<p>The article deals with the application of the method for mathematical modeling and simulation at solving some issues in the area of electrostatic technology. It focuses on the processes in electrostatic separation and precipitation. Computer simulation is highly required for equipment design and for their diagnostics in critical operating states using theoretical calculations and experimental data evaluation. The presented computer models may be applied both by project and design engineers using the most advanced computer-aided design of electrostatic technologies.</p>

The Studying of Logix Gear Construction Principle and Parameter Simulation Using Matlab

2011 ◽  
Vol 80-81 ◽  
pp. 1118-1122
Author(s):  
Ai Qin An ◽  
Ming Hua Pang ◽  
Lian Feng Zhang ◽  
Yong Fang Nie
Keyword(s):  
Mathematical Models ◽  
Computer Aided Design ◽  
Gear Tooth ◽  
Tooth Profile ◽  
Profile Curve ◽  
Computer Aided ◽  
Base Circle ◽  
Manufacturing Methods ◽  
Aided Design ◽  
Logix Gear

Logix gear is a new gear based on new tooth profile theory. On the primary, the forming principle of the logix gear tooth profile is analysed. Then the tooth profile curve equations of logix gear are derived, and their center coordinate equations of base circle are given. According these equations, their curves are simulated using Matlab, which are corresponded to practical tests. The study lays a foundation of computer aided design of the logix gears. And the study can be used to perfect mathematical models and to optimize manufacturing methods.

scholarly journals Effect of Fabrication Method on Fracture Strength of Provisional Implant-Supported Fixed Dental Prostheses

Prosthesis ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 325-332
Author(s):  
Kelly M. Suralik ◽  
Jie Sun ◽  
Chia-Yu Chen ◽  
Sang J. Lee
Keyword(s):  
Computer Aided Design ◽  
Fracture Force ◽  
Fixed Dental Prosthesis ◽  
Computer Aided ◽  
Cad Cam ◽  
3D Printers ◽  
Fixed Dental Prostheses ◽  
3D Printed ◽  
Aided Design ◽  
Post Hoc

There has been an increase in utilizing 3D printers in dental restorations. The purpose of the study is to compare mechanical properties of 3D-printed prostheses to those of self-cured and/or computer-aided design-computer-aided manufacturing (CAD-CAM) restorations. A metal master typodont was prepared for the mandibular left sextant with implant analogs embedded at the first premolar and first molar positions with a missing second premolar. Three-unit provisional fixed dental prosthesis (FDP) was designed utilizing the 3Shape tooth library and forty-five uniform specimens were fabricated with different materials: self-cured poly(methyl methacrylate) (PMMA) (N = 15), milled PMMA CAD-CAM blocks (N = 15) and 3D-printed resin (N = 15). All specimens were tested using an Instron machine at a crosshead speed of 0.5 mm/min by an axial load on the occlusal surface of the second premolar pontic site. Statistical analysis was completed with Shapiro-Wilk, ANOVA and Tukey post-hoc tests. Mean fracture force was 300.61 N, 294.64 N and 408.49 N for self-cured PMMA, milled PMMA and 3D-printed resin, respectively. Mean force at FDP fracture of 3D-printed resin was significantly greater than the mean fracture force of either self-cured (p = 0.016, 95% CI [17.86, 197.91]) or milled (p = 0.010, 95% CI [23.83, 203.88]) PMMA.

New Computer Aided Design, Finite Element Modelling and Three-Dimensional Measuring of Rear Screen Creep Forming

1995 ◽  
Vol 209 (2) ◽  
pp. 137-143 ◽  
Author(s):  
D Lochegnies ◽  
E François ◽  
J Oudin
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Computer Aided Design ◽  
Finite Element Modelling ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Element Modelling ◽  
Computer Aided ◽  
Analysis Strategy ◽  
Aided Design

A new analysis strategy for creep forming by coupling computer aided design (CAD), finite element models (FEM) and three-dimensional measuring (3D M) with two new CAD/FEM and CAD/3D M interfaces. From the design product via Bézier curves, the manufacturer is now able to predict and adjust creep forming database (initial form of the sheet, geometry of the skeleton, temperature map in the sheet at the furnace exit and forming time) through CAD and FE modules. A reference rear screen manufacture is optimized using the previous strategy and validated with the experimental data through CAD and 3D M modules.

scholarly journals 3D Printing beyond Dentistry during COVID 19 Epidemic: A Technical Note for Producing Connectors to Breathing Devices

Prosthesis ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 46-52 ◽  
Author(s):  
Leonardo Cavallo ◽  
Antonia Marcianò ◽  
Marco Cicciù ◽  
Giacomo Oteri
Keyword(s):  
Computer Aided Design ◽  
Technical Note ◽  
Digital Workflow ◽  
Computer Aided ◽  
Cad Cam ◽  
3D Printers ◽  
3D Printed ◽  
Dental Professional ◽  
Respiratory Devices ◽  
Aided Design

(1) Background: To mitigate the shortage of respiratory devices during the Covid-19 epidemic, dental professional volunteers can contribute to create printed plastic valves, adapting the dental digital workflow and converting snorkeling masks in emergency CPAP (continuous positive airways pressure) devices. The objective of this report was to provide the specific settings to optimize printing with the 3D printers of the dental industry. (2) Methods: In order to provide comprehensive technical notes to volunteer dental professionals interested in printing Charlotte and Dave connectors to breathing devices, the entire digital workflow is reported. (3) Results: The present paper introduces an alternative use of the dental Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) machinery, and reports on the fabrication of a 3D printed connection prototypes suitable for connection to face masks, thereby demonstrating the feasibility of this application. (4) Conclusions: This call for action was addressed to dentists and dental laboratories who are willing to making available their experience, facilities and machinery for the benefit of patients, even way beyond dentistry.

scholarly journals DEVELOPMENT OF A SOFTWARE AND HARDWARE COMPLEX FOR THE DESIGN OF CHEMICAL AND TECHNOLOGICAL SYSTEMS

2021 ◽  
Vol 2021 (1) ◽  
pp. 19-23
Author(s):  
Andrey Istomin ◽  
Maksim Krivov ◽  
Alena Andreevna Istomina
Keyword(s):  
Mathematical Models ◽  
Computer Aided Design ◽  
Software Package ◽  
Technological Systems ◽  
Complex Chemical ◽  
Technological Processes ◽  
Hardware Complex ◽  
Computer Aided ◽  
Software And Hardware ◽  
Aided Design

The problems of constructing a software package for computer-aided design of mathematical models of complex chemical and technological processes are considered.

Mathematical models for rotor strength and optimization in computer-aided design

1982 ◽  
Vol 14 (8) ◽  
pp. 1099-1102
Author(s):  
I. V. Dem'yanushko ◽  
V. V. Zhestovskii ◽  
V. Ya. Bratchik
Keyword(s):  
Mathematical Models ◽  
Computer Aided Design ◽  
Computer Aided ◽  
Aided Design
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