Layer thickness estimation of 3D printed model for digital multimedia forensics

2019 ◽  
Vol 55 (2) ◽  
pp. 86-88
Author(s):  
J.‐U. Hou ◽  
H.‐K. Lee
Keyword(s):  
Layer Thickness ◽  
Multimedia Forensics ◽  
Thickness Estimation ◽  
Digital Multimedia ◽  
3D Printed

scholarly journals The Soft Layer Thickness Estimation using Microtremor Measurement to Identify Landside Potential in Watukumpul, Central Java, Indonesia.

2021 ◽  
Vol 6 (1) ◽  
pp. 16-23
Author(s):  
Urip Nurwijayanto Prabowo ◽  
Akmal Ferdiyan ◽  
Ayu Fitri Amalia
Keyword(s):  
Layer Thickness ◽  
Spectral Ratio ◽  
Dominant Frequency ◽  
Soil Slope ◽  
Soft Layer ◽  
Thickness Estimation ◽  
Central Java ◽  
Hvsr Method ◽  
Microtremor Measurement ◽  
Potential Area

Watukumpul is an area that is prone to landslides, so determining the soft layer thickness is very important to identify the landslide potential. The soft layer thickness can be estimated using microtremor signal measurements which analyzed using the Horizontal to Vertical Spectral Ratio (HVSR). In this study,we measured microtremor signal of 33location around Watukumpul, Pemalang, Central Java area to determine soft layer thickness. Micretremor signal was analyzed based on theHVSR method using Geopsy software and follow the standard of the Sesame Europan Project. The results of the HVSR method are the HVSR curve that fulfills the reliable curve standard. HVSR curve shows that the dominant frequency of soft layer ranges from 1.36 – 7.62 Hz and the amplification values ranges from 9.00 – 41.45. The soft layer thickness value in the study area ranges from 17.58 - 103.60 meters. The high landslide potential area are located at W7, W8, W18, W30 and W32 where has thin soft layer and high soil slope.

scholarly journals Kinematic Analysis and Dimensional Synthesis of a Meso-Gripper

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Guochao Bai ◽  
Xianwen Kong ◽  
James Millar Ritchie
Keyword(s):  
Size Range ◽  
Dimensional Synthesis ◽  
Mesoscopic Scale ◽  
Robotic Hands ◽  
Modes Of Operation ◽  
Digital Multimedia ◽  
Dual Functional ◽  
Industrial Assembly ◽  
3D Printed ◽  
Constraint Method

Abstract In recent years, applications in industrial assemblies within a size range from 0.5 mm to 100 mm are increasing due to the large demands for new products, especially those associated with digital multimedia. Research on grippers or robotic hands within the mesoscopic scale of this range has not been explored in any great detail. This paper outlines the development of a gripper to bridge the gap between microgrippers and macrogrippers by extending the gripping range to the mesoscopic scale, particularly without the need to switch grippers during industrial assembly. The mesoscopic scale gripper (meso-gripper) researched in this work has two modes of operation: passive adjusting mode and angled gripping mode, adapting its configuration to the shape of object automatically. This form of gripping and the associated mechanism are both novel in their implementation and operation. First, the concept of mesoscopic scale in robotic gripping is presented and contextualized around the background of inefficient hand switching processes and applications for assembly. The passive adjusting and angled gripping modes are then analyzed and a dual functional mechanism design proposed. A geometric constraint method is then demonstrated which facilitates task-based dimensional synthesis after which the kinematics of synthesized mechanism is investigated. The modified synthesized mechanism gripper is then investigated according to stiffness and layout. Finally, a 3D printed prototype is successfully tested, and the two integrated gripping modes for universal gripping verified.

scholarly journals Tensile impact behaviour of 3D printed parts on FFF/FDM printer Zortrax M200

2018 ◽  
Vol 210 ◽  
pp. 04049 ◽  
Author(s):  
Ales Mizera ◽  
Martin Bednarik ◽  
Martin Mizera ◽  
Katarina Tomanova ◽  
Martin Mohorko
Keyword(s):  
Layer Thickness ◽  
Material Properties ◽  
Impact Test ◽  
Polymeric Materials ◽  
Material Testing ◽  
3D Printer ◽  
Fracture Surface Morphology ◽  
Tensile Impact ◽  
3D Printed ◽  
Manufacturing Technologies

To obtain the deeper knowledge about the mechanical behaviour of 3D printed polymeric materials it is necessary to study the material properties from the beginning to the end. The commonly processed polymeric materials (via injection moulding etc.) are already deeply studied and evaluated, but 3D printed specimens in the various orientation build are not yet. In this study the tensile impact test specimens were fabricated via a desktop material extrusion 3D printer Zortrax M200 processing ABS and HIPS in build orientation XY. The 3D printed tensile impact test specimens were examined to compare the effect of layer thickness. Impact pendulum Zwick HIT50P was used for tensile impact tests according to ISO 8256 standard. Optical microscopy was utilized to perform fractography on impact test specimens to explore the effect of the layer thickness on the fracture surface morphology of the failed specimens. This study demonstrates the need for material testing for specific processing as additive manufacturing technologies.

scholarly journals Dead layer thickness estimation at the ferroelectric film-metal interface in PZT

2019 ◽  
Vol 114 (13) ◽  
pp. 132902 ◽  
Author(s):  
Yu. V. Podgorny ◽  
K. A. Vorotilov ◽  
A. S. Sigov ◽  
J. F. Scott
Keyword(s):  
Layer Thickness ◽  
Ferroelectric Film ◽  
Dead Layer ◽  
Metal Interface ◽  
Thickness Estimation ◽  
Dead Layer Thickness

Study the precision of fixed partial dentures of Co-Cr alloys cast over 3D printed prototypes

2018 ◽  
Vol 1 (90) ◽  
pp. 25-32 ◽  
Author(s):  
Ts. Dikova ◽  
Dzh. Dzhendov ◽  
Iv. Katreva ◽  
Ts. Tonchev
Keyword(s):  
Surface Roughness ◽  
Layer Thickness ◽  
Dimensional Accuracy ◽  
Average Roughness ◽  
Dental Clinics ◽  
Primary Model ◽  
3D Printers ◽  
3D Printed ◽  
The Right ◽  
Printed Patterns

Purpose: of this paper is to investigate the accuracy of Co-Cr dental bridges, manufactured using 3D printed cast patterns. Design/methodology/approach: Four-unit dental bridges are fabricated from the alloys i-Alloy and Biosil-f by lost-wax process. The polymeric cast patterns are 3D printed with different layer’s thickness (13 μm, 35 μm and 50 μm). Two 3D printers are used: stereolithographic “Rapidshape D30” and ink-jet “Solidscape 66+”. The geometrical and fitting accuracy as well as the surface roughness are investigated. Findings: It is established that Co-Cr bridges, casted from 3D printed patterns with 50 μm layer thickness, characterize with the largest dimensions – 3.30%-9.14% larger than those of the base model. Decreasing the layer thickness leads to dimensional reduction. The dimensions of the bridges, casted on patterns with 13 μm layer thickness, are 0.17%-2.86% smaller compared to the primary model. The average roughness deviation Ra of the surface of Co-Cr bridges, manufactured using 3D printed patterns, is 3-4 times higher in comparison to the bridge-base model. The greater the layer thickness of the patterns, the higher Ra of the bridges. The silicone replica test shows 0.1-0.2 mm irregular gap between the bridge retainers and abutments of the cast patterns and Co-Cr bridges. Research limitations/implications: Highly precise prosthetic constructions, casted from 3D printed patterns, can be produced only if the specific features of the 3D printed objects are taken in consideration. Practical implications: Present research has shown that the lower the thickness of the printed layer of cast patterns, the higher the dimensional accuracy and the lower the surface roughness. Originality/value: The findings in this study will help specialist in dental clinics and laboratories to choose the right equipment and optimal technological regimes for production of cast patterns with high accuracy and low surface roughness for casting of precise dental constructions.

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