Evaluation of Visual Failure versus Aerodynamic Limit for a Snow Contaminated Anti-Iced Wing Section during Simulated Takeoff

2019 ◽  
Author(s):  
Catherine Clark ◽  
Marco Ruggi
Keyword(s):  
Wing Section ◽  
Visual Failure

Application of AFP in Resolving Systematic Issue in Wafer Fabrication

2013 ◽  
Author(s):  
Hui Peng Ng ◽  
Ghim Boon Ang ◽  
Chang Qing Chen ◽  
Alfred Quah ◽  
Angela Teo ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Case Studies ◽  
Failure Mechanisms ◽  
Critical Role ◽  
Electrical Characterization ◽  
Process Technology ◽  
Atomic Force ◽  
Defect Localization ◽  
Non Volatile Memory ◽  
Visual Failure

Abstract With the evolution of advanced process technology, failure analysis is becoming much more challenging and difficult particularly with an increase in more erratic defect types arising from non-visual failure mechanisms. Conventional FA techniques work well in failure analysis on defectively related issue. However, for soft defect localization such as S/D leakage or short due to design related, it may not be simple to identify it. AFP and its applications have been successfully engaged to overcome such shortcoming, In this paper, two case studies on systematic issues due to soft failures were discussed to illustrate the AFP critical role in current failure analysis field on these areas. In other words, these two case studies will demonstrate how Atomic Force Probing combined with Scanning Capacitance Microscopy were used to characterize failing transistors in non-volatile memory, identify possible failure mechanisms and enable device/ process engineers to make adjustment on process based on the electrical characterization result. [1]

In the Wake of Visual Failure

Social Text ◽  
2021 ◽  
Vol 39 (2) ◽  
pp. 1-23
Author(s):  
Wendy Sung
Keyword(s):  
Racial Violence ◽  
Visual Form ◽  
Dominant Discourses ◽  
Visual Failure

Abstract This article examines the role of the visual in instances of recorded anti-Black racial violence and pushes against dominant discourses of the technological rescue narrative—that technology and more visibility will lead to different outcomes of accountability, protection, and safety. Instead, this article argues that the tightly bound association of anti-Black racial violence's recognizability to the visual has created a dynamic that simultaneously moves us closer to and further away from its ontological truths. Examining Twitter as a multisensorial platform and its users’ imaginative engagements with the #IfIDieInPoliceCustody hashtag memorializing Sandra Bland's death, the author identifies that users craft an anticipatory nonspectatorship, a mode of imaginative witnessing arising from the contexts of technological and visual failure and the situated imaginations of Black epistemologies. These users register a deep suspicion of the evidentiary and refuse the spectacular of racial violence's visual form, instead highlighting its ubiquitous and quotidian nature by asserting themselves into their own scenes of visual failure and becoming witnesses to their own imagined deaths. Finally, in identifying the visual failures surrounding Sandra Bland's jail cell, the author illuminates how the ontology of the glitch can demonstrate the mechanics of white supremacy's operations.

Analytical and Experimental Flutter Analysis of a Typical Wing Section Carrying a Flexibly Mounted Unbalanced Engine

2019 ◽  
Vol 19 (02) ◽  
pp. 1950013 ◽  
Author(s):  
A. S. Mirabbashi ◽  
A. Mazidi ◽  
M. M. Jalili
Keyword(s):  
Stability Domain ◽  
Governing Equations ◽  
Lagrange Equations ◽  
Wing Section ◽  
Unbalanced Force ◽  
Engine Thrust ◽  
Finite State Model ◽  
Flutter Analysis ◽  
Finite State ◽  
The Stability

In this paper, both experimental and analytical flutter analyses are conducted for a typical 5-degree of freedon (5DOF) wing section carrying a flexibly mounted unbalanced engine. The wing flexibility is simulated by two torsional and longitudinal springs at the wing elastic axis. One flap is attached to the wing section by a torsion spring. Also, the engine is connected to the wing by two elastic joints. Each joint is simulated by a spring and damper unit to bring the model close to reality. Both the torsional and longitudinal motions of the engine are considered in the aeroelastic governing equations derived from the Lagrange equations. Also, Peter’s finite state model is used to simulate the aerodynamic loads on the wing. Effects of various engine parameters such as position, connection stiffness, mass, thrust and unbalanced force on the flutter of the wing are investigated. The results show that the aeroelastic stability region is limited by increasing the engine mass, pylon length, engine thrust and unbalanced force. Furthermore, increasing the damping and stiffness coefficients of the engine connection enlarges the stability domain.

Sign in / Sign up

Export Citation Format

Share Document