scholarly journals Research and design a combined model of pile driving and pressing machine

2020 ◽  
pp. 310-320
Keyword(s):  
General Theory ◽  
Single Machine ◽  
Three Dimensional ◽  
Pile Driving ◽  
Combined Model ◽  
Construction Machine ◽  
Small Models ◽  
One Machine ◽  
Research And Design ◽  
Base Machine

The paper presents general theory about making small models for studying large machines. Here, the author refers to the design of pile driving and pressing machines. To express ideas, the author presents design drawings presented in three-dimensional perspective. Currently, pile drivers and pile presses are two separate machines, in which their base machine is the same, their working parts are slightly different. The author takes advantage of the slight differences to combine them into one machine, so as to ensure that this machine is able to pile or pile. In addition, the structure of pile making and pressing machines is created by the author, which is somewhat simpler than the current construction and driving machine. This successful study will form the basis for manufacturing a pile driving machine and pile machine into a single machine, greatly reducing the costs of procurement and construction machine use.

Theory of Electron Diffraction by Crystals

1967 ◽  
Vol 22 (4) ◽  
pp. 422-431 ◽  
Author(s):  
Kyozaburo Kambe
Keyword(s):  
Integral Equation ◽  
Electron Diffraction ◽  
General Theory ◽  
Green’S Function ◽  
Green's Function ◽  
Scattering Problem ◽  
Three Dimensional ◽  
Two Dimensions ◽  
The Third ◽  
Third Dimension

A general theory of electron diffraction by crystals is developed. The crystals are assumed to be infinitely extended in two dimensions and finite in the third dimension. For the scattering problem by this structure two-dimensionally expanded forms of GREEN’S function and integral equation are at first derived, and combined in single three-dimensional forms. EWALD’S method is applied to sum up the series for GREEN’S function.

Mathematical aspects of molecular replacement. IV. Measure-theoretic decompositions of motion spaces

2017 ◽  
Vol 73 (5) ◽  
pp. 387-402 ◽  
Author(s):  
Gregory S. Chirikjian ◽  
Sajdeh Sajjadi ◽  
Bernard Shiffman ◽  
Steven M. Zucker
Keyword(s):  
General Theory ◽  
Rigid Body ◽  
Three Dimensional ◽  
Molecular Replacement ◽  
Translation Group ◽  
Common Occurrence ◽  
Space Group ◽  
Space Groups ◽  
Relevant Case ◽  
The Subject

In molecular-replacement (MR) searches, spaces of motions are explored for determining the appropriate placement of rigid-body models of macromolecules in crystallographic asymmetric units. The properties of the space of non-redundant motions in an MR search, called a `motion space', are the subject of this series of papers. This paper, the fourth in the series, builds on the others by showing that when the space group of a macromolecular crystal can be decomposed into a product of two space subgroups that share only the lattice translation group, the decomposition of the group provides different decompositions of the corresponding motion spaces. Then an MR search can be implemented by trading off between regions of the translation and rotation subspaces. The results of this paper constrain the allowable shapes and sizes of these subspaces. Special choices result when the space group is decomposed into a product of a normal Bieberbach subgroup and a symmorphic subgroup (which is a common occurrence in the space groups encountered in protein crystallography). Examples of Sohncke space groups are used to illustrate the general theory in the three-dimensional case (which is the relevant case for MR), but the general theory in this paper applies to any dimension.

Numerical Simulation and Experimental Research of a New Butterfly Valve

2012 ◽  
Vol 212-213 ◽  
pp. 1255-1260 ◽  
Author(s):  
Yang Wang ◽  
Ying Zhu ◽  
Xin Rong Shen ◽  
Jian Feng Ma
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Linear Relationship ◽  
Experimental Research ◽  
Three Dimensional ◽  
Flow Coefficient ◽  
Butterfly Valve ◽  
Valve Opening ◽  
Research And Design ◽  
Relative Flow

The paper proposes an idea of projection weighted area in designing a new control butterfly valve. A lot of three-dimensional numerical simulations are carried out on the new valve, and the numerical simulations give a good linear relationship between relative flow coefficient and relative valve opening. An experiment setup was established to verify the results of numerical simulations, and the results show that the CFD technology to research and design the new valve plate is entirely feasible.

Finite-element analysis of multi-body contacts for pile driving using a hydraulic pile hammer

2011 ◽  
Vol 225 (5) ◽  
pp. 1153-1161 ◽  
Author(s):  
Y Guo ◽  
J P Hu ◽  
L Y Zhang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Test Point ◽  
Pile Driving ◽  
Penalty Function Method ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Material Choice ◽  
Multi Body ◽  
The Impact

This article treats the pile driving as multi-body dynamic contacts. By using the penalty function method and three-dimensional model of finite-element method, the dynamic process of pile driving is acquired and a method for choosing the cushion material of the hydraulic pile hammer to improve driving efficiency is proposed. The process of pile driving in the real situation of an industrial experiment is simulated. The results of stress on test point are consistent with the test point. By analysing the stress distributed along the direction of pile radius and pile axis, the rule of the stress distribution on the pile is concluded. The rule for cushion material choice is obtained by comparing the influence for the impact stress with different elastic modulus ratio of the hammer cushion to the pile and the pile cushion to the pile.

Modeling of Three-Dimensional Terrain Data for Intelligent Control of Unmanned Construction Machine in Deterministic Surfacing Process

2014 ◽  
Vol 1073-1076 ◽  
pp. 1917-1921
Author(s):  
Xin Min Shen ◽  
Jian Zhao Zhou ◽  
Li Qun Han
Keyword(s):  
Intelligent Control ◽  
Three Dimensional ◽  
Residual Error ◽  
Operation Planning ◽  
Regular Grid ◽  
3D Terrain ◽  
Surface Data ◽  
Digital Elevation ◽  
Construction Machine ◽  
Elevation Model

Deterministic surfacing technique is an effective method for intelligent control of operation planning of the unmanned construction machine, and its foundation is the accurate modeling of the three-dimensional terrain data. According to the digital elevation model based on regular grid, the modeling of 3D terrain surface data is obtained. The evaluation of residual error is further investigated, which is quite important for the iterated operation in deterministic surfacing. Through revealing flow chart of the deterministic surfacing method, the importance of the modeling of terrain data and that of the evaluation of residual error are emphasized. The study on modeling of terrain data will promote application of the deterministic surfacing in intelligent control of unmanned construction machine.

ON TOROIDAL FUNCTIONS

1959 ◽  
Vol 37 (5) ◽  
pp. 619-635 ◽  
Author(s):  
S. C. Loh
Keyword(s):  
General Theory ◽  
Three Dimensional ◽  
Laplace’S Equation ◽  
Laplace's Equation ◽  
General Solutions ◽  
University Of Toronto ◽  
The University

The general solutions of Laplace's equation in toroidal co-ordinates have been derived, both for the three-dimensional and the axial symmetrical cases. Also, the general theory and properties of toroidal functions have been briefly outlined.The numerical tables for the zonal and the tesseral toroidal functions were calculated by the I.B.M. 650 Computer at the University of Toronto, and are included in the present paper.

scholarly journals EXPOENTE DE AVRAMI PELA EQUAÇÃO DE JMAK PARA MÉTODO NÃO-ISOTÉRMICO DE ANÁLISE TÉRMICA

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Salmo Moreira Sidel ◽  
Elio Idalgo ◽  
Keizo Yukimitu ◽  
João Carlos Silos Moraes ◽  
Fabio Alencar Dos Santos
Keyword(s):  
Crystal Growth ◽  
General Theory ◽  
Isothermal Crystallization ◽  
Crystallization Process ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Nucleation Process ◽  
Vitreous System ◽  
Isothermal Measurements ◽  
Dimensional Crystal

This work reports a discussion about of the general theory for phase transformations of Melh-Johnson-Avrami-Kolmogorov in process involving non-isothermal crystallization. This model allows determine as occurs the mechanism of the nucleus formation and of growth of crystalline phases during the crystallization process. To demonstrate the validity this theory, the Avrami exponent (n) of the LiO2-TeO2-WO3 vitreous system was determined from DSC non-isothermal measurements. The obtained results indicate that the nucleation process is volumetric with two-dimensional or three-dimensional crystal growth. DOI: http://dx.doi.org/10.30609/JETI.2018-2.5566

An Inquiry into Relational Concepts of Colour, Based on Incremental Principles of Colour Coding for Minimal Relational Stimuli

Perception ◽  
1993 ◽  
Vol 22 (4) ◽  
pp. 427-462 ◽  
Author(s):  
Rainer Mausfeld ◽  
Reinhard Niederée
Keyword(s):  
General Theory ◽  
Conceptual Framework ◽  
Three Dimensional ◽  
Relational Model ◽  
Colour Constancy ◽  
Colour Perception ◽  
The Core ◽  
Relational Perspective ◽  
Relational Concepts ◽  
Colour Coding

Centre – surround stimuli evoke colour appearances (resembling surface colours) which cannot be produced by a single homogeneous spot of light alone (eg brown or grey). Although this seems of great impact to a general theory of colour (including ‘colour constancy’), the psychophysics of these ‘minimal relational stimuli’ is still less well understood than often assumed. On the basis of empirical as well as theoretical observations concerning centre– surround-type stimuli we introduce a relational model of colour coding. At the core of this model is the concept of a three-dimensional linear incremental colour code which behaves differently for increments and decrements. This model takes into account results on ‘discounting the background’ mechanisms and it is closely related to ratio-based relational concepts and to certain opponent-colour theories. In addition, it provides an analogue to the classical distinction between light and object colours, and covers colour appearances related to object colours as well. Within the conceptual framework offered, problems of complex colour perception (eg ‘colour constancy’) and judgmental modes are discussed. Conclusions regarding general limitations of three-dimensional modelling in colour perception are derived and corresponding refinements of the relational perspective are briefly outlined.

Implementación del Método SIME (Single Machine Equivalent) en DIgSILENT PowerFactory para calcular Márgenes de Estabilidad Transitoria

2016 ◽  
Vol 12 (1) ◽  
Author(s):  
D. Echeverría ◽  
P. Salazar ◽  
J. Cepeda ◽  
H. Arcos
Keyword(s):  
New England ◽  
Programming Language ◽  
Single Machine ◽  
El Sistema ◽  
One Machine

Este trabajo presenta una herramienta computacional, basada en el Método SIME (Single Machine Equivalent), la cual permite evaluar problemas de estabilidad transitoria en sistemas eléctricos de potencia. Mediante esta herramienta se obtienen márgenes de estabilidad que orientan la definición de acciones de control preventivo para mejorar la seguridad dinámica del sistema de potencia. El software es desarrollado utilizando lenguaje de programación DIgSILENT Programming Language (DPL) y enfoca su análisis en la determinación de índices de seguridad dinámica que permiten evaluar en el comportamiento del sistema de potencia en su configuración post-falla en términos del equivalente OMIB (One Machine Infinite Bus). La evolución de las magnitudes eléctricas (ángulo y velocidad del rotor, potencia mecánica y eléctrica) del OMIB es calculada a partir de la evolución en el tiempo de las magnitudes eléctricas de las máquinas del sistema de potencia y a partir del criterio de igualdad de áreas EAC, se calculan los márgenes de estabilidad transitoria del sistema de potencia. Los resultados obtenidos de la aplicación de la metodología en el sistema de prueba IEEE New England, permiten verificar las bondades del método para calcular márgenes de estabilidad transitoria.

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