scholarly journals Investigation of Singularities in a 3/4 CMG Configuration with Mixed Skew Angles

2020 ◽  
Author(s):  
Jonathan W. Lang
Keyword(s):  
Skew Angles

Unseating of single-span bridges with skew angles out of the limit range for free rotation

Structures ◽  
2021 ◽  
Vol 32 ◽  
pp. 1320-1330
Author(s):  
Suiwen Wu ◽  
Junfei Huang ◽  
Weifeng Li ◽  
Chiyu Jiao ◽  
Jianzhong Li
Keyword(s):  
Free Rotation ◽  
Skew Angles

scholarly journals Nose-Angle Bridge Piers as Alternative Countermeasures for Local Scour Reduction

2018 ◽  
Vol 13 (2) ◽  
pp. 110-120 ◽  
Author(s):  
Ibtesam Abudallah Habib ◽  
Wan Hanna Melini Wan Mohtar ◽  
Atef Elsaiad ◽  
Ahmed El-Shafie
Keyword(s):  
Froude Number ◽  
Local Scour ◽  
Bridge Piers ◽  
Scour Depth ◽  
Skew Angle ◽  
Flow Angle ◽  
Sediment Size ◽  
Low Froude Number ◽  
Skew Angles ◽  
Depth Reduction

This study investigates the performance nose-angle piers as countermeasures for local scour reduction around piers. Four nose angles were studied, i.e., 90°, 70°, 60° and 45° and tested in a laboratory. The sediment size was fixed at 0.39 mm whereas the flow angle of attack (or skew angle) was varied at four angles, i.e., skew angles, i.e., 0°, 10°, 20° and 30°. Scour reduction was clear when decreasing nose angles and reached maximum when the nose angle is 45°. Increasing the flow velocity and skew angle was subsequently increasing the scour profile, both in vertical and transversal directions. However, the efficiency of nose angle piers was only high at low Froude number less than 0.40 where higher Froude number gives minimal changes in the maximum scour depth reduction. At a higher skew angle, although showed promising maximum scour depth reduction, the increasing pier projected width resulted in the increase of transversal lengths.

scholarly journals Influence of Skew Angles on Box Type Bridge

2020 ◽  
Vol 9 (7) ◽  
pp. 64-69
Keyword(s):  
Finite Element ◽  
Earth Pressure ◽  
Live Load ◽  
Skew Angle ◽  
Dead Load ◽  
Shear Forces ◽  
Modeling And Analysis ◽  
Finite Element Software ◽  
Skew Angles ◽  
Bottom Slab

In the present study, modeling and analysis of a three-lane three-span box bridge has been carried out by using finite element software STAAD pro.v8i. The study has been execute to find the effect of skew angle on all bride slabs (top slab, bottom slab, outer walls, inner walls) under various loads (dead load, live load, surfacing load, earth pressure, temperature and live load surcharge) and their combinations using IRC 6:2016. Skew angles taken for study ranges from 00 to 700 with an interval of 100 . Parameters that are mainly examined are longitudinal moments, transverse moments, torsional moments, shear forces and displacements. It has been observed that with the increase of skew angle all the parameters increases with the increase of skew angles in all slabs.

scholarly journals Investigation of local scour around tandem piers for different skew-angles

2018 ◽  
Vol 40 ◽  
pp. 03008 ◽  
Author(s):  
Sargol Memar ◽  
Mohammad Zounemat-Kermani ◽  
Ali-Asghar Beheshti ◽  
Giovanni De Cesare ◽  
Anton J. Schleiss
Keyword(s):  
Flow Direction ◽  
Local Scour ◽  
Scour Depth ◽  
Skew Angle ◽  
Approach Velocity ◽  
Sheltering Effect ◽  
Skew Angles

In the present study the effect of the skew-angle of the alignment of tandem piers on local scour depth around them is investigated. The tandem piers were aligned with different skew-angles of θ=0°,30°,45°,60°,90° with respect to the flow direction. The results indicatethat with the increment of the skew-angle, the influence of sheltering effects is decreased. In other word, since the sheltering effect of the upstream pier is declined (which reduces the approach velocity for the downstream pier) the scour depth around downstream pier increases. The results show that the maximum scour depth occurs at both piers for the skew-angle of θ=45°.Furthermore, the best configuration to aligned tandem piers was achieved at the skew-angle of θ=30°.

Free Vibration of Skew Laminates – A Brief Review and Some Benchmark Results

2019 ◽  
Vol 161 (A4) ◽  
Keyword(s):  
Free Vibration ◽  
Shear Deformation ◽  
Composite Laminates ◽  
Shear Deformation Theory ◽  
Single Layer ◽  
Laminated Composite ◽  
Free Vibration Analysis ◽  
Static And Dynamic Analysis ◽  
Aspect Ratios ◽  
Skew Angles

This study investigates and reviews prior research works on skew composite laminates. The equivalent single layer theories are explored and discussed. An exhaustive review on static and dynamic analysis of composite skew laminates is also presented. Subsequently, a nine node isoparametric plate bending element is used for free vibration analysis of laminated composite skew plate with central skew cut out. The effect of shear deformation is incorporated in the formulation considering first order shear deformation theory. Two types of mass lumping schemes are analysed to study the effect of rotary inertia. Certain numerical examples of plates having different skew angles, skew cut out sizes, boundary conditions, thickness ratios (h/a), aspect ratios (a/b), fiber orientations and number of layers are solved which will be useful for benchmarking of future studies.

Determination of Attack Angle and Tilt Angle of a Cutting Pick

2013 ◽  
Vol 705 ◽  
pp. 415-418 ◽  
Author(s):  
Yong Sun ◽  
Xing Sheng Li
Keyword(s):  
Tilt Angle ◽  
Attack Angle ◽  
Optimal Values ◽  
Skew Angles ◽  
The Relationship

Mechanical excavators play an important role in mining and construction. An excavation machine cuts rocks using its cutterhead which is normally composed of a large number of cutting picks. These picks are installed on a drum with certain attack angles, tilt angles and skew angles. These angles, especially attack and tilt angles, will affect the forces acting on individual picks and the cutterhead. To ensure the reliability and productivity of the excavation machine, these angles have to be kept in their optimal values. However, in manufacturing, these three types of angles cannot be set simultaneously. They have to be respectively set one after another. As a result, the angle which is set previously will be changed by the angles which are determined after it. Understanding the relationship between the values of the final angle and the designed angle is important for optimizing drum and pick design. This paper develops a formula for quantitatively analyzing this relationship, with the research scope limited to attack angle and tilt angle only as the first stage of the study.

Estimation of skew angles for scanned documents based on piecewise covering by parallelograms

2007 ◽  
Vol 40 (2) ◽  
pp. 443-455 ◽  
Author(s):  
Chien-Hsing Chou ◽  
Shih-Yu Chu ◽  
Fu Chang
Keyword(s):  
Skew Angles ◽  
Scanned Documents

scholarly journals Linear and Nonlinear Analyses of Skewed Plates

1967 ◽  
Vol 34 (2) ◽  
pp. 271-277 ◽  
Author(s):  
J. B. Kennedy ◽  
Simon Ng
Keyword(s):  
Aspect Ratio ◽  
Large Deflection ◽  
Successive Approximations ◽  
Rectangular Plates ◽  
Aspect Ratios ◽  
Linear And Nonlinear ◽  
Center Deflection ◽  
Skewed Plates ◽  
Skew Angles ◽  
Resultant Stress

The perturbation method is used to analyze small and large-deflection problems of clamped skewed plates under uniform pressure. The results are improved by successive approximations to the three displacement components of a point on the middle plane of the plate. Numerical and graphical results are presented. Comparisons are made with existing results for skewed plates with small deflections as well as with results for rectangular plates with small and large-deflection behavior; good agreement is shown. The effects of skew and aspect ratio on plates with large deflections are investigated. The ratios of maximum center deflection to thickness of plate at which linear and nonlinear theories start deviating significantly from each other are obtained for different aspect ratios and skew angles. It is shown that the center deflection decreases with increase in skew and aspect ratio, and that the maximum resultant stress occurs along the longer edges of the plates and is displaced toward the obtuse corners.

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