SLS Class 3D Woven Composite End Ring Structure Design, Development, and Verification Testing

2022 ◽  
Author(s):  
Kenneth N. Segal ◽  
Babak Farrokh ◽  
Andrew Bergan ◽  
Arunkumar Satyanarayana ◽  
David W. Sleight ◽  
...  
Keyword(s):  
Ring Structure ◽  
Structure Design ◽  
Design Development ◽  
Woven Composite

scholarly journals The Investigation of Internal Turret Single Point Mooring Slip Ring Structure Design

2019 ◽  
Vol 252 ◽  
pp. 022060
Author(s):  
Bingbing Wang ◽  
Keming Hong ◽  
Cheng Feng ◽  
Haibo Zhang
Keyword(s):  
Single Point ◽  
Ring Structure ◽  
Structure Design ◽  
Slip Ring

scholarly journals Multiobjective Optimization Design for Structural Parameters of TBM Disc Cutter Rings Based on FAHP and SAMPGA

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Laikuang Lin ◽  
Yimin Xia ◽  
Dun Wu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Structural Parameters ◽  
Rock Breaking ◽  
Ring Structure ◽  
Structure Design ◽  
Disc Cutter ◽  
Load Bearing ◽  
Geological Conditions ◽  
Weight Coefficients

As a key component of tunnel boring machines (TBMs), the disc cutter ring and its structural parameters are closely related to the TBM tunneling quality. Literature review shows that investigations on optimization design methods for cutter ring structure are seriously insufficient. Therefore, in this paper, a multiobjective optimization design model of structural parameters for disc cutter rings is developed based on the complex geological conditions and the corresponding cutter ring structure design requirements. The rock breaking capability, energy consumption, load-bearing capability, wear life, and wear uniformity of disc cutter are selected as the objectives, and the geometric structure of cutter rings, ultimate load-bearing capability, and cutterhead drive performance are determined as constraints. According to the characteristics of this model, a self-adaptive multipopulation genetic algorithm (SAMPGA) is utilized to solve the optimization problem, and the Fuzzy analytical hierarchy process (FAHP) is employed to calculate weight coefficients for multiple objectives. Finally, the applicability of the proposed method is demonstrated through a case study in a TBM project. The results indicated that the rock breaking performance and service life of the disc cutter are improved after optimization by using the proposed method. The utilization of SAMPGA effectively solves the premature local convergence problems during optimization. The geological adaptability should be considered in the cutter ring structure design, which can be realized by using the proposed method based on the suitable weight coefficients.

Effect of Guard Ring Design and Properties of Inter-Layer Dielectric Film on Chip Reliability

2005 ◽  
Author(s):  
Farnaz Parhami ◽  
Stephen Pan
Keyword(s):  
Crack Propagation ◽  
Integrated Circuit ◽  
Semiconductor Industry ◽  
Ring Structure ◽  
Structure Design ◽  
Point Of View ◽  
Guard Ring ◽  
Element Analysis ◽  
Good Reliability ◽  
Interlayer Dielectric

One of the common reliability problems in semiconductor industry is delamination of dielectric films used in the integrated circuit manufacturing process. Although these films have demonstrated good reliability performance in wafer form, once placed in different packages and undergo stress testing (e.g. pressure cooker test) they tend to crack and delaminate and lead to eventual reliability failure of the chip. The die guard ring can impact propagation of cracks that are initiated at the edge of the die into the active circuitry of the die. We designed several guard ring structures and performed finite element analysis to compare the potential of crack propagation for different guard ring designs. It is found that some features of the design do not affect stress intensity factor KI (potential of crack propagation). For long crack (3.75 um), structure A may reduce KI. But, structure B will increase KI. From fracture mechanics point of view, structure A may stop crack propagation toward die center. However, with structure B, the crack may still penetrate into the die. For short crack (1.25 um), effect of guard ring structure design is negligible. We have made experimental wafers using our wafer manufacturing processes to create structure A and B around the dice. Some wafers were made with film AA as interlayer dielectric and some with film BB as interlayer dielectric. SEM inspections validate our FEM models that structure A captures more cracks at the edge of the die and prevents its propagation into the die while structure B is less effective. We have shown that even with incorporation of structure B guard ring, film BB looses adhesion to other layers and delaminates upon exposure to humidity in pressure cooker test while film AA never delaminates.

Analysis of Auxiliary Structure Mounted on 8x8 Military Vehicle Chassis for Off-Road Logistics

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
Vikas Radhakrishna Deulgaonkar
Keyword(s):  
Finite Element ◽  
Tracking System ◽  
Measurement Techniques ◽  
High Mobility ◽  
Structure Design ◽  
Rank Test ◽  
Design Development ◽  
Element Analysis ◽  
Signed Rank Test ◽  
Load Pattern

Present work deals with the design, development of auxiliary structure mounted on high mobility off-road 8x8 wheeled military logistic vehicles or troop trucks. Such auxiliary structures offer a levelled base to the shelters carrying cargo ranging from sophisticated electronic equipment, tracking system, troops, weapons, arms and ammunition which require special environment to function. Design traits as clearance between the shelter and skids, intense load pattern, approach, departure and ramp angles and their effects on auxiliary structure design are presented. Design factors such as load distribution on front and rear axles, shelter height, ground clearance and their effects on the structure design are discussed. Finite element analysis (FEA) technique is utilized to simulate the behaviour of the auxiliary structure. Formulated auxiliary structure configuration possess exceptional resistance against twisting and bending due to introduction of the intense load pattern. Different configurations and variant load response of this structure is figured out using FEA simulation procedure. Application of statistical and experimental strain measurement techniques for design validation of the formulated structure is presented. Wilcoxon signed rank test is employed for evaluation of experimental and finite element outcomes.

Membrane Deflection Analysis of the Intelligent Micro-Sensor/Pump Under the Consideration of Micro-Viscosity and Membrane Pillar

2005 ◽  
Author(s):  
T. C. Yih ◽  
Shalini R. Gillella
Keyword(s):  
Applied Pressure ◽  
External Pressure ◽  
Structure Design ◽  
Design Parameters ◽  
Membrane Thickness ◽  
Design Development ◽  
Viscosity Effect ◽  
Micro Pump ◽  
Micro Sensor ◽  
Membrane Deflection

New emerging technologies such as MEMS “Micro-Electro-Mechanical Systems” provides many promising opportunities for developing innovative methods. This research focuses on the design, development and analysis of functional micro-pumps. Micro-pumps open new frontiers of engineering applications where precise fluid amounts to a targeted location are required. Micro-pumps can be used in environmental monitoring, where localized water quality measurements are needed, chemical/biological detection and analysis, and industrial process control. Conventional MEMS micro-pumps are driven by micro-actuators, which add complication to micro-pump membrane/structure design, control, and fabrication. The proposed MEMS micro-pump will have its membrane (or diaphragm) be sensitive to external pressure change and self-actuated in response to a designated pressure level; thus named IMSP (intelligent micro-sensor/pump). This paper provides a detailed study of membrane deflection which is one of the most important component of micro-pump. The membrane of the conventional design has uniform thickness. The novel smart micro-pump has a membrane pillar in the center. This membrane pillar has advantages of greater stability, larger pumping force and longer life cycle. The deflection of the membrane is analyzed and compared in two cases: 1) Membrane deflection without membrane pillar, and 2) Membrane deflection with membrane pillar. The micro-viscosity effect on a micro-pump will be augmented as the size of the micro-pump becomes smaller, especially in the micron range. Therefore two more cases are analyzed under the consideration of micro-viscosity effect: 1) Membrane deflection with micro-viscosity effect and without membrane pillar, and 2) Membrane deflection with micro-viscosity effect and with membrane pillar. The critical design parameters of the membrane—thickness and diameter—are varied and substituted into the governing equations to calculate the membrane deflection. The curves of membrane deflection versus the applied pressure on the membrane are plotted for further characterization of the micro-pump. This study will lead to the full development of a smart micro-pump and set off a new research direction.

scholarly journals Scandinavian design of the XXI century: traditions and modernity

2021 ◽  
pp. 22-27
Author(s):  
Elena Leonidovna Elkina ◽  
Ekaterina Yur'evna Ivanova
Keyword(s):  
Industrial Revolution ◽  
Conceptual Art ◽  
Structure Design ◽  
Design Development ◽  
Environmental Friendliness ◽  
Current Trends ◽  
Scientific Disciplines ◽  
Responsible Consumption ◽  
History Of ◽  
Scandinavian Design

This article presents the analysis of Northern design of the XXI century, its achievements, and significance. Design is viewed as a phenomenon that has evolved since the era of industrial revolution. The current trends in environmental design are explored. The author comprehends the years-long trend for environmental friendliness and responsible consumption in design as a whole, as well as the vectors of development of object design in particular. The key approach is the analytical approach, within the framework of which the design development trends are assessed as a part of popular culture. At the same time, their designated purpose to increase the competitiveness of goods on the markets. The design is based on the principles of functionality and feasibility. The goal design is to impose certain qualities upon things, such as aesthetic appeal, convenience, commensurability. Working on the design project implies certain stages: functional analysis, layout, construction, creation of a spatial and graphical structure. Design employs the data from multiple scientific disciplines: semiotics, ergonomics, sociology, aesthetics, philosophy, and culturology. The fundamentals of design originate in the history of art, architecture, modern trends and styles in art,  conceptual art, crafts in terms of industrial production, synthesizing with innovative technologies and materials. Use of the stylistics of Northern design is substantiated by demand for the things of high quality, but inexpensive design.

Small Angle Electron Scattering From Vacuum Condensed Metallic Films

1968 ◽  
Vol 26 ◽  
pp. 380-381
Author(s):  
J. Silcox ◽  
R. H. Wade
Keyword(s):  
Electron Scattering ◽  
Small Angle ◽  
Ring Structure ◽  
Two Dimensional ◽  
Metallic Films ◽  
Micro Structure ◽  
Angle Scattering ◽  
The Fourier Transform ◽  
Source Of Information ◽  
Kinematical Theory

Recent work has drawn attention to the possibilities that small angle electron scattering offers as a source of information about the micro-structure of vacuum condensed films. In particular, this serves as a good detector of discontinuities within the films. A review of a kinematical theory describing the small angle scattering from a thin film composed of discrete particles packed close together will be presented. Such a model could be represented by a set of cylinders packed side by side in a two dimensional fluid-like array, the axis of the cylinders being normal to the film and the length of the cylinders becoming the thickness of the film. The Fourier transform of such an array can be regarded as a ring structure around the central beam in the plane of the film with the usual thickness transform in a direction normal to the film. The intensity profile across the ring structure is related to the radial distribution function of the spacing between cylinders.

Immunoelectron microscope detection of C-type natriuretic peptide in normal human atrial tissue

1993 ◽  
Vol 51 ◽  
pp. 388-389
Author(s):  
Chi-Ming Wei ◽  
Margaret Hukee ◽  
Christopher G.A. McGregor ◽  
John C. Burnett
Keyword(s):  
Amino Acid ◽  
Natriuretic Peptide ◽  
Vascular Tone ◽  
Cardiac Tissue ◽  
Ring Structure ◽  
Terminal Amino Acid ◽  
Amino Acid Peptide ◽  
Normal Human ◽  
Terminal Amino ◽  
The Brain

C-type natriuretic peptide (CNP) is a newly identified peptide that is structurally related to atrial (ANP) and brain natriuretic peptide (BNP). CNP exists as a 22-amino acid peptide and like ANP and BNP has a 17-amino acid ring formed by a disulfide bond. Unlike these two previously identified cardiac peptides, CNP lacks the COOH-terminal amino acid extension from the ring structure. ANP, BNP and CNP decrease cardiac preload, but unlike ANP and BNP, CNP is not natriuretic. While ANP and BNP have been localized to the heart, recent investigations have failed to detect CNP mRNA in the myocardium although small concentrations of CNP are detectable in the porcine myocardium. While originally localized to the brain, recent investigations have localized CNP to endothelial cells consistent with a paracrine role for CNP in the control of vascular tone. While CNP has been detected in cardiac tissue by radioimmunoassay, no studies have demonstrated CNP localization in normal human heart by immunoelectron microscopy.

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