Research on Coordinate System Transformation in Flexible Rope FEA

2013 ◽  
Vol 753-755 ◽  
pp. 1785-1789
Author(s):  
Yun Peng Zhao ◽  
Nan Li
Keyword(s):  
Coordinate System ◽  
Direction Cosine ◽  
Euler Angle ◽  
Mechanical Analysis ◽  
Inertial System ◽  
System Transformation ◽  
Finite Rotation ◽  
Element Type ◽  
Multi Body ◽  
The Relationship

This paper focuses on the transform relationships between each element and between elements with inertial system under different attitude coordinate system in the finite element multi-body system mechanical analysis of the flexible rope process. It mainly research the attitude coordinate transformation matrix between the of flexible rope Micro-element and inertial system under the four coordinate system which are the direction cosine coordinates, finite rotation four element coordinates, Euler angle coordinate and Cardan angle coordinates, and the relationship between the connecting base on the element type and inertial reference based.

A Study of Belleville Spring and Diaphragm Spring in Engineering

1990 ◽  
Vol 57 (4) ◽  
pp. 1026-1031 ◽  
Author(s):  
Ye Zhiming ◽  
Yeh Kaiyuan
Keyword(s):  
Integral Equation ◽  
Experimental Method ◽  
Conical Shell ◽  
Large Deflection ◽  
Integral Equation Method ◽  
Mechanical Analysis ◽  
Static Response ◽  
Finite Rotation ◽  
Calculating Method ◽  
Distribution Rules

This paper deals with the static response of a Belleville spring and a diaphragm spring by using the finite rotation and large deflection theories of a beam and conical shell, and an experimental method as well. The authors propose new mechanical analysis mathematical models. The exact solution of a variable width cantilever beam is obtained. By using the integral equation method and the iterative method to solve the simplified equations and Reissner’s equations of finite rotation and large deflection of a conical shell, this paper has calculated a great number of numerical results. The properties of loads, strains, stresses and displacements, and the distribution rules of strains and stresses of diaphragm springs are investigated in detail by means of the experimental method. The unreasonableness of several assumptions in traditional theories and calculating method is pointed out.

scholarly journals Sustainable overall social transformation as a way of progress.

2020 ◽  
Vol 16 ◽  
pp. 126-139
Author(s):  
Arkady Martynov
Keyword(s):  
Social System ◽  
Social Transformation ◽  
Climate Changes ◽  
Social Progress ◽  
System Transformation ◽  
Organizational Changes ◽  
Exogenous Factors ◽  
Exhaustive Study ◽  
System Sustainability ◽  
The Relationship

The paper concerns the fundamental issues of the sustainable social progress. As follows from the argumentation, a realistic design of institutional changes in connection with resource and organizational changes needed for sustainable progress is called for to realize in the line of overall social system transformation. This approach presupposes an exhaustive study of interconnected transformations in the main societal fields as system processes considering the influence of relatively exogenous factors (technological, demographic and climate changes). In turn, it is advisable, taking in view current world challenges, to expose an idea of ​​universal sustainability, the property of which is inherent in all social practices, and not just mediating the relationship between society and its environment. The first result of study concludes in revealing the fundamentals of overall social system sustainability. The second result: the transition to sustainable transformation of society supposes the synergetic implementation of structure-forming system and policy-driven shifts.

scholarly journals Sustainable Progress – The Achievable Result of Overall Social System Transformation

2020 ◽  
Vol 1 (2) ◽  
pp. p89
Author(s):  
Arkady Martynov
Keyword(s):  
Social System ◽  
Climate Changes ◽  
Social Practices ◽  
Social Progress ◽  
System Transformation ◽  
Organizational Changes ◽  
Exogenous Factors ◽  
Exhaustive Study ◽  
System Sustainability ◽  
The Relationship

The paper concerns the fundamental issues of the sustainable social progress. As follows from the argumentation, a realistic design of institutional changes in connection with resource and organizational changes needed for sustainable progress is called for to realize in the line of overall social system transformation. This approach presupposes an exhaustive study of interconnected transformations in the main societal fields as system processes considering the influence of relatively exogenous factors (technological, demographic and climate changes). In turn, it is advisable, taking in view current world challenges, to expose an idea of universal sustainability, the property of which is inherent in all social practices, and not just mediating the relationship between society and its environment.The first result of study concludes in revealing the fundamentals of overall social system sustainability. The second result: the transition to sustainable transformation of society supposes the synergetic implementation of structure-forming system and policy-driven shifts.

Modeling and Mechanical Analysis of Snake Robots on Cylinders

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Chaoquan Tang ◽  
Peng Li ◽  
Gongbo Zhou ◽  
Deyuan Meng ◽  
Xin Shu ◽  
...  
Keyword(s):  
Mechanical Analysis ◽  
Point Of View ◽  
The Body ◽  
Optimal Method ◽  
Tree Structures ◽  
Snake Robot ◽  
Mechanical Models ◽  
And Performance ◽  
The Relationship ◽  
Snake Robots

The narrow and redundant body of the snake robot makes it suitable for the inspection of complex bar structures, such as truss or tree structures. One of the key issues affecting the efficient motion of snake robots in complex bar structures is the development of mechanical models of snake robots on cylinders. In other words, the relationship between the payload and structural and performance parameters of the snake robot is still difficult to clarify. In this paper, the problem is approached with the Newton–Euler equations and the convex optimal method. Firstly, from the kinematic point of view, the optimal attitude of the snake robot wrapped around the cylinder is found. Next, the snake robot is modeled on the cylinder and transformed into a convex optimization problem. Then, the relationship between the payload of the snake robot on the cylinder and the geometric and attitude parameters of the body of snake robots is analyzed. Finally, the discussion for the optimal winding attitude and some advices for the design of the snake robot are proposed. This study is helpful toward the optimal design of snake robots, including geometry parameters and motor determination.

scholarly journals Rigid-flexible coupled dynamics analysis of 3-revolute-prismatic-spherical parallel robot based on multi-software platform

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401982645 ◽  
Author(s):  
Haitao Luo ◽  
Jia Fu ◽  
Lichuang Jiao ◽  
Ning Chen ◽  
Tingke Wu
Keyword(s):  
Computer Technology ◽  
Maximum Stress ◽  
Maximum Error ◽  
Parallel Robot ◽  
Mechanical Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Software Platform ◽  
Design And Optimization ◽  
Multi Body

Kinematics and dynamics are the most important and basic tool for robot research. With the help of computer technology and the respective advantages of three kinds of software, a new method of co-simulation of parallel robot based on multi-platform is proposed, and the mechanical model of multi-body system of 3-revolute-prismatic-spherical parallel robot is established. According to the mechanical analysis of the parallel robot, the rigid-flexible coupling analysis method is adopted. The displacement error shows a periodic change with a period of 4.2 s and the maximum error is [Formula: see text]. The dangerous part of the structure is the root of the lower link, and its maximum stress is 202.64 MPa less than the yield strength of the material. The multi-software platform co-simulation improves the accuracy of the dynamic response analysis of the part under dynamic load, and provides an important theoretical basis for the design and optimization of the parallel robot.

scholarly journals Modelling change and cultural safety: A case study in northern British Columbia health system transformation

2018 ◽  
Vol 32 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Margo Greenwood
Keyword(s):  
Health System ◽  
Indigenous Peoples ◽  
Cultural Safety ◽  
System Transformation ◽  
Health System Change ◽  
Health Authorities ◽  
The Relationship ◽  
Canadian Healthcare System ◽  
Canadian Healthcare

The relationship that Indigenous Peoples have to the Canadian healthcare system makes the system’s weaknesses and complexities obvious. The long-standing lack of consideration to the historical and contemporary realities of Indigenous Peoples has resulted in miscommunication, misunderstanding, mistrust and racism. Health leaders, including health authorities, across the province are thus challenged to ensure that culturally safe environments are available and culturally safe practices are being used. This article begins with an overview of contemporary social political contexts in which Indigenous individual and collective realities are situated. Following is a conceptual discussion focused on health system change and the experiences of Indigenous Peoples. Change at structural, systemic and individual levels is the focus of the change model presented in this article. Throughout this exploration, examples of concrete actions currently underway in a health authority are offered. The article concludes with visions for future change.

scholarly journals Cone Algorithm of Spinning Vehicles under Dynamic Coning Environment

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Shuang-biao Zhang ◽  
Xing-cheng Li ◽  
Zhong Su
Keyword(s):  
Pitch Angle ◽  
Euler Angle ◽  
Roll Angle ◽  
Angle Error ◽  
Attitude Error ◽  
Spinning Process ◽  
Cone Algorithm ◽  
Definition Of ◽  
Yaw Angle ◽  
The Relationship

Due to the fact that attitude error of vehicles has an intense trend of divergence when vehicles undergo worsening coning environment, in this paper, the model of dynamic coning environment is derived firstly. Then, through investigation of the effect on Euler attitude algorithm for the equivalency of traditional attitude algorithm, it is found that attitude error is actually the roll angle error including drifting error and oscillating error, which is induced directly by dynamic coning environment and further affects the pitch angle and yaw angle through transferring. Based on definition of the cone frame and cone attitude, a cone algorithm is proposed by rotation relationship to calculate cone attitude, and the relationship between cone attitude and Euler attitude of spinning vehicle is established. Through numerical simulations with different conditions of dynamic coning environment, it is shown that the induced error of Euler attitude fluctuates by the variation of precession and nutation, especially by that of nutation, and the oscillating frequency of roll angle error is twice that of pitch angle error and yaw angle error. In addition, the rotation angle is more competent to describe the spinning process of vehicles under coning environment than Euler angle gamma, and the real pitch angle and yaw angle are calculated finally.

scholarly journals Electromagnetic Radiation from the Geometrical Point of View

2018 ◽  
Vol 186 ◽  
pp. 01002
Author(s):  
Divakov Dmitriy ◽  
Malykh Mikhail ◽  
Tiutiunnik Anastasiia
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Radiation ◽  
Coordinate System ◽  
Maxwell's Equations ◽  
Plane Waves ◽  
Geometrical Optics ◽  
Point Of View ◽  
Curvilinear Coordinates ◽  
Point To Point ◽  
The Relationship

The article describes the relationship between the solutions of Maxwell's equations which can be considered at least locally as plane waves and the curvilinear coordinates of geometrical optics. We introduce phase-ray coordinate system for any electromagnetic field if vectors E and H are orthogonal to each other and their directions do not change with time t, but may vary from point to point in the domain G.

scholarly journals Research on target location of unmanned aerial vehicles in parallel path

2020 ◽  
Vol 309 ◽  
pp. 04002
Author(s):  
Huadong Luo ◽  
Jun Yan ◽  
Haifeng Ling ◽  
Guangna Zhang ◽  
Qing Wang ◽  
...  
Keyword(s):  
Coordinate System ◽  
Target Location ◽  
Vision System ◽  
Direction Cosine ◽  
Weighted Average ◽  
Target Position ◽  
Detection Algorithm ◽  
Target Point ◽  
Parallel Path ◽  
Direction Information

This paper mainly studies how to use the stereo vision system that combines the monocular vision with parallel path search to locate the target. When the unmanned aerial vehicle (UAV) searches in the mission area according to the parallel path, the SSD image detection algorithm based on deep learning is adopted to detect and identify the target in the area. The image coordinate information is inversely calculated by using the pixel coordinate information fed back by machine vision. The auxiliary coordinate system is established according to the relationship of angle position between the track line and the basic coordinate system in the parallel path. Combining the position relation and the attitude direction information of UAV, the target position conversion relation between the imaging coordinate system and the auxiliary coordinate system is solved by using the direction cosine matrix. Combined with the coordinate information of UAV, the coordinate position of the target point in the basic coordinate system is finally solved through three coordinate conversion operations. In order to avoid the single calculating error of the target coordinates, the weighted average operation is carried out. On the basis of not changing the search trip of the parallel path, the target location function is preliminarily realized through the reverse solution and the weighted average operation of the target coordinates.

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