scholarly journals Extended sequential limit analysis: Addressing large deflections and shape changes in strain hardening circular membranes with a moving coordinate system

2021 ◽  
Vol 169 ◽  
pp. 108471
Author(s):  
Lijia Fan
Keyword(s):  
Coordinate System ◽  
Strain Hardening ◽  
Limit Analysis ◽  
Large Deflections ◽  
Moving Coordinate ◽  
Shape Changes

Plastic limit analysis with non linear kinematic strain hardening for metalworking processes applications

2011 ◽  
Vol 25 (11) ◽  
pp. 2859-2870 ◽  
Author(s):  
Ali Chaaba ◽  
Lahbib Bousshine ◽  
Mohamed Aboussaleh ◽  
Hassan El Boudaia
Keyword(s):  
Strain Hardening ◽  
Limit Analysis ◽  
Plastic Limit ◽  
Non Linear ◽  
Plastic Limit Analysis

scholarly journals A Note on the Barotropic Forecast Using a Moving Coordinate System

1956 ◽  
Vol 34 (3) ◽  
pp. 164-168 ◽  
Author(s):  
S. Syono ◽  
K. Gambo ◽  
K. Miyakoda ◽  
M. Aihara ◽  
S. Manabe
Keyword(s):  
Coordinate System ◽  
Moving Coordinate

scholarly journals Operating on Tensors within Dynamic Coordinate Frames

2018 ◽  
Author(s):  
Keith C. Afas
Keyword(s):  
Coordinate System ◽  
Continuum Mechanics ◽  
Theoretical Models ◽  
Tensor Calculus ◽  
Dynamic Distortion ◽  
Coordinate Frames ◽  
Moving Coordinate ◽  
Calculus Of Moving Surfaces

This paper puts forward an alteration for Tensor Calculus utliized in a coordinate system which is under a dynamic distortion drawing inspiration from similar fields such as the Calculus of Moving Surfaces (CMS). The paper establishes transformation laws for Tensors within these regions and establishes Operators such as the Tensorial Field Derivative which enforce a Tensorial Transformation on Tensors defined within a Dynamically Moving coordinate system. This variation of Tensor Calculus can be utilized to observe how disciplines such as QFT and Continuum Mechanics would change to accomodate for a distorting coordinate system and can be utliized to develop new theoretical models which account for this temporal distortion particularly within Biological Settings.

The Motion Planning for Spherical Robot with Two Motors

2015 ◽  
Vol 789-790 ◽  
pp. 688-692
Author(s):  
Xin Wang
Keyword(s):  
Particle Swarm Optimization ◽  
Angular Velocity ◽  
Motion Planning ◽  
Coordinate System ◽  
Optimization Problem ◽  
Kinematic Model ◽  
Pso Algorithm ◽  
Spherical Robot ◽  
Swarm Optimization ◽  
Moving Coordinate

In this paper, we proposed a spherical robot with two motors in the horizontal and vertical directions which derive the robot to do omni-directionally roll. Based on the structure of the robot, we derived the kinematic model using inertial and moving coordinate system. In order to minimize the energy of the system, an optimization problem with two optimization variables which are the parameters to control the angular velocity of the motors is given. After that, a particle swarm optimization (PSO) algorithm is used to solve the optimization problem. The simulation shows that the motion planning with the algorithm has high precision.

Oil Shale Retorting in a Bottom-Burning Retort

1981 ◽  
Vol 103 (2) ◽  
pp. 119-127
Author(s):  
K. S. Udell ◽  
H. R. Jacobs
Keyword(s):  
Experimental Study ◽  
Coordinate System ◽  
Combustion Front ◽  
Oil Shale ◽  
Thermal Processes ◽  
High Quality ◽  
Uniform Velocity ◽  
Moving Coordinate

An experimental study of a bottom-burning oil shale retort is described. It is shown that for a constant oxidizer flow the combustion front moves at a uniform velocity through the bed. This leads to the use of a moving coordinate system attached to the combustion front in evaluating the various thermal processes occurring in the retort. It is shown that the high quality of oil produced can be tied to a thermal refluxing not present in other retort processes.

On the Workspace of Closed-Loop Manipulators With Ground-Mounted Rotary-Linear Actuators and Finite Size Platform

1987 ◽  
Author(s):  
Tzu-Chen Weng ◽  
G. N. Sandor ◽  
Yongxian Xu ◽  
D. Kohli
Keyword(s):  
Coordinate System ◽  
Closed Loop ◽  
Finite Size ◽  
Degree Of Freedom ◽  
Moving Coordinate ◽  
Linear Actuators ◽  
Six Degree Of Freedom

Abstract This paper deals with the workspace of a closed-loop manipulator having three rotary-linear (R-L) actuators on ground-mounted cylindric joints, plus three revolute and three spheric pairs [1]. The workspace is defined as the reachable region of the origin of the moving coordinate system embedded in the six-degree-of-freedom platform of the manipulator. The regions in the workspace where the platform can rotate in any direction, cannot rotate or can rotate in only some directions have been defined as complete rotatability workspace (CRW), nonrotatability workspace (NRW) and partial rotatability workspace (PRW). Equations of the workspace of the platform which has a) complete theoretical rotatability and b) nonrotatability (when its center is on the boundary of the workspace) are respectively derived. The reachable region of the center of the platform, where this center remains in a plane with a given platform orientation, is also studied.

Calculation trajectories of stealthy movement of aircraft to a specified point in detection zone of onboard Doppler radar

2021 ◽  
Author(s):  
A.P. Kirsanov
Keyword(s):  
Coordinate System ◽  
Doppler Radar ◽  
Characteristic Parameter ◽  
Parametric Family ◽  
Detection Zone ◽  
Coverage Area ◽  
Moving Coordinate ◽  
Characteristic Features

An onboard radar operating in the impulse–Doppler mode has the characteristic features of the detection zone. The feature lies in the fact that at every point of the detection zone an aircraft has a sector of directions such as the onboard Doppler radar will not detect it as long as it moves in these directions. This sector is called the sector of invisible motion directions of the aircraft. Because of these features, there are such trajectories that aircraft flying along them are not detected by an onboard Doppler radar, such as an AWACS radar. The article proposes a method for planning stealthy trajectories between two given points in the Doppler radar coverage area. Trajectories are selected from a parametric family of elliptical stealthy trajectories, which are ellipses in the AWACS-associated moving coordinate system. An equation is found for the characteristic parameter of the ellipse, the solution of which allows us to uniquely identify the stealthy trajectory between two given points. The conditions for the existence of stealthy trajectories passing through specified points are investigated.

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