A Multi-technology Approach to Identifying the Reasons for Lateral Drift in Professional and Recreational Darts

2011 ◽  
Author(s):  
Michael Walsh ◽  
John Barton ◽  
Brendan O'Flynn ◽  
Cian O'Mathuna ◽  
Magdalena Tyndyk
Keyword(s):  
Lateral Drift

Behaviour of slender concrete shear walls with high-strength reinforcement under reversed cyclic loading.

2021 ◽  
Author(s):  
Nima Aghniaey ◽  
Murat Saatcioglu ◽  
Hassan Aoude
Keyword(s):  
Large Scale ◽  
Shear Walls ◽  
High Strength ◽  
Shear Wall ◽  
Analytical Investigation ◽  
Seismic Behaviour ◽  
Drift Capacity ◽  
Lateral Drift ◽  
Experimental Findings ◽  
Reversed Cyclic

Research on seismic behaviour of shear walls with high-strength steel is limited. A combined experimental and analytical investigation was conducted to assess seismic behaviour of flexure-dominant shear walls. A large-scale concrete shear wall with Grade 690 MPa (ASTM A1035) reinforcement and 84 MPa concrete was tested under simulated seismic loading. The wall was a ¼ -scale of a 6-storey shear wall, with 4.53 m height and 1.45 m length. It sustained a lateral drift of 1.8% prior to developing failure due to the rupturing of longitudinal reinforcement. This is 35% less than the drift capacity of a companion wall reinforced with 400 MPa reinforcement tested earlier. VecTor2 software was used to conduct an analytical parametric study to expand the experimental findings. The results indicate that the reinforcement grade has a significant impact on strength, ductility and hysteretic behaviour of shear walls.

scholarly journals Development and simulations of Enhanced Lateral Drift Sensors

2019 ◽  
Vol 14 (05) ◽  
pp. C05005-C05005 ◽  
Author(s):  
A. Velyka ◽  
H. Jansen
Keyword(s):  
Lateral Drift

scholarly journals Imaging Lateral Drift Kinetics to Understand Causes of Outdoor Degradation in Silicon Heterojunction Photovoltaic Modules

Solar RRL ◽  
2019 ◽  
Vol 3 (8) ◽  
pp. 1900102 ◽  
Author(s):  
Dana B. Sulas ◽  
Steve Johnston ◽  
Dirk C. Jordan
Keyword(s):  
Photovoltaic Modules ◽  
Lateral Drift

SEISMIC PERFORMANCE EVALUATION OF ASSEMBLED O-STABLE PANEL WALLS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Shiming Chen ◽  
Bingrui Zhuang ◽  
Ping Gu
Keyword(s):  
Thickness Variation ◽  
Structural Wall ◽  
Seismic Performance Evaluation ◽  
Lateral Drift ◽  
Failure State ◽  
Ultimate Failure ◽  
New Type ◽  
Seismic Index ◽  
Panel Thickness ◽  
Vertical Joint

O-Stable Panel is a new type of assembled structural wall. To evaluate the performance properties of the O-Stable Panel system, three integral prefabricated panel specimens with different vertical connections at the bottom and one full cast-in-place panel specimen were designed and tested under the low cycle lateral reciprocating loading. The performance of the prefabricated O-Stable Panel systems with different vertical connection configurations was compared with those of the full cast-in-place panel. The investigation reveals that all prefabricated O-Stable panel specimens developed vertical cracks penetrating through thickness of the panels at the panel joint and at the positions where panel thickness variation occurs at the ultimate failure state. The O-Stable panels possess the likely symmetric and stable hysteretic curves and no pinching appearance in shape of the curves. The panel with grouting sleeve in vertical joint for steel rebar appears sharp degrading in seismic index as the lateral drift of the wall increases beyond yield of the panel. For the assembled panel with preinstalled rebar stretched into the foundation beam for the vertical rebar joints, it has very close values in the hysteretic energy dissipation as that in the full cast-in-place panels.

Application of the Nes Model for Static Recovery of the Dislocation Density in Cold Rolled AA6XXX

2014 ◽  
Vol 794-796 ◽  
pp. 605-610 ◽  
Author(s):  
Alex Penlington ◽  
Bradley Diak ◽  
Hai Ou Jin
Keyword(s):  
Dislocation Density ◽  
Profile Analysis ◽  
Model Fit ◽  
Line Profile Analysis ◽  
Static Recovery ◽  
Lateral Drift ◽  
Series Aluminum Alloy ◽  
Cold Rolled ◽  
6Xxx Series ◽  
Kinetics Of

An experimental 6XXX series aluminum alloy, Al-0.4Mg-1.2Si-0.49Cu-0.14Mn-0.2Fe(wt.%), was cold rolled 73% and the kinetics of its static recovery studied isochronally between 80 to 350°C, and isothermally at 175 and 205°C. Typical recovery is described by an extrinsic property such as yield stress, however, this study utilized the intrinsic dislocation density extracted from x-ray line profile analysis using a modified Williamson-Hall analysis. The static recovery of dislocation density was fit to the models of Nes [Acta Metall. Mater. 43 (1995) 2189–2207], suggesting that recovery is controlled by the migration of jogged screw dislocations assuming no lateral drift during annealing. The model fit of isothermal annealing at 175°C and 205°C yields activation energies of 0.99 and 1.7 eV/at., respectively. The change in energies can be correlated to an observed change in lattice strain with recovery.

scholarly journals Effect of Roof and Diaphragm Connectivity on Dynamic Behaviour of the PP-band Retrofitted Adobe Masonry Structures

2018 ◽  
Author(s):  
Navaratnarajah Sathiparan
Keyword(s):  
Shaking Table Test ◽  
Masonry Wall ◽  
Shaking Table ◽  
Experimental Program ◽  
Masonry Structures ◽  
Test Results ◽  
Structural Components ◽  
Masonry Unit ◽  
Seismic Safety ◽  
Lateral Drift

This paper discusses the shaking table test results of three PP-band (Polypropylene band) retrofitted quarter scale one-story masonry house models with different roof conditions. Better connections between masonry wall and roof connection are one factor to improve the seismic safety of the masonry houses. Past studies show that PP-band retrofitting improves the integrity of structural components and prevent the collapse of masonry structures during an earthquake. Although the effect of masonry unit type, surface plastering, the pitch of the PP-band mesh, PP-band connectivity in mesh and tightness of the mesh attachment to walls were studied by experiment program, the effect of the roof and its diaphragm connectivity on PP-band retrofitted masonry structure is nonexistent. Therefore, an experimental program was designed and executed for an understanding the effect of the roof and its connection on the dynamic behavior of the PP-band retrofitted box-shaped masonry house models. Results reveal that the PP-band retrofitted models with proper roof diaphragm improves the seismic behavior with respect to lateral drift, shear resistance and ductility.

Towards an Optical Aircraft Navigation System

2014 ◽  
Vol 629 ◽  
pp. 321-326
Author(s):  
Javaan Chahl ◽  
Aakash Dawadee
Keyword(s):  
Optical Flow ◽  
Navigation System ◽  
High Performance ◽  
Vision System ◽  
Optical Navigation ◽  
Machine Vision System ◽  
Lateral Drift ◽  
Aircraft Navigation ◽  
Polarization Compass ◽  
Flow Detection

Navigation by means that are fully self contained, without the weight and cost of high performance inertial navigation units is highly desirable in many applications both military and civilian. In this paper we introduce a suite of sensors and behaviors that include: the means to reduce lateral drift due to wind using optical flow, detection of a constellation of landmarks using a machine vision system, and a polarization compass that is reliable at extreme latitudes based on polarization. In a series of flight trials and detailed simulations we have demonstrated that a combination of these functions achieves purely optical navigation with simplicity and robustness.

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