scholarly journals Simplified Analytical Method for Estimating the Resistance of Lock Gates to Ship Impacts

2012 ◽  
Vol 2012 ◽  
pp. 1-39 ◽  
Author(s):  
Loïc Buldgen ◽  
Hervé Le Sourne ◽  
Philippe Rigo
Keyword(s):  
Analytical Method ◽  
Analytical Approach ◽  
Structural Elements ◽  
Global Mode ◽  
Global Deformation

The present paper is concerned with the design of lock gates submitted to ship impacts. In this paper, a simplified analytical method is presented to evaluate the resistance of such structures under collision. The basic idea is to assume that the resistance is first provided through a local deforming mode, corresponding to a localized crushing of some impacted structural elements. For consecutive larger deformations, the resistance is then mostly provided through a global deforming mode, corresponding to an overall movement of the entire gate. For assessing the resistance in the case of the local deforming mode, the structure is divided into a given number of large structural entities called “superelements.” For each of them, a relation between the resistance of the gate and the penetration of the striking ship is established. However, as some results are already available in the literature, this subject is not treated extensively in this paper. On the contrary, the calculation of the resistance of the gate provided through the global mode is detailed and the strategy to switch from local to global deformation is highlighted. Finally, we propose to validate our developments by making a comparison between results obtained numerically and those predicted by the present analytical approach.

Random Collocation Method (RCM)

2010 ◽  
Author(s):  
Hiroshi Isshiki
Keyword(s):  
Numerical Method ◽  
Collocation Method ◽  
Analytical Method ◽  
Traditional Method ◽  
Analytical Approach ◽  
Numerical Procedure ◽  
Computational Method ◽  
Weak Point ◽  
The Past ◽  
Innovative Idea

Recently, young people’s concern on theory is becoming very poor. If there is a numerical procedure that is friendlier with theory, the distance between theory and calculation would be decreased much, and the interaction between them would become more active. When the geometry of the domain is simple, the traditional analytical method using function expansion is very convenient in many numerical problems. In many problems, it has given very useful solutions for various problems. However, its effectiveness is usually limited to simple geometries of the domain. In the past, a fusion of the analytical approach and computational one has not been pursued sufficiently. If it becomes possible, it may give a different paradigm for obtaining the numerical solution. In the present paper, an innovative idea named Random Collocation Method (RCM) is discussed on how to overcome the weak point of the traditional method by combining it with computational method. It is the purpose of the present paper to develop the simplest numerical method and to make the distance between the theory and numerical method as small as possible.

scholarly journals Analytical Method of Modelling the Geometric System of Communication Route

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Wladyslaw Koc
Keyword(s):  
Differential Equations ◽  
Analytical Method ◽  
Analytical Approach ◽  
Linear Change ◽  
Linear And Nonlinear ◽  
Transition Curves

The paper presents a new analytical approach to modelling the curvature of a communication route by making use of differential equations. The method makes it possible to identify both linear and nonlinear curvature. It enables us to join curves of the same or opposite signs of curvature. Solutions of problems for linear change of curvature and selected variants of nonlinear curvature in polynomial and trigonometric form were analyzed. A comparison of determined horizontal transition curves was made and examples of negotiating these curves into a geometric system were given.

scholarly journals دراسة مقارنة بين تعليمات الحوكمة الصادرة من مصرف قطر المركزي ونظام الحوكمة الصادر من هيئة قطر للأسواق المالية (A Comparison Study Between Governance instructions issued by Qatar Central Bank and Governance System issued by Qatar Financial Markets Authority)

2020 ◽  
Vol 17 (4) ◽  
pp. 78-118
Author(s):  
أسماء القره داغي ◽  
عارف علي عارف ◽  
عزنان حسن ◽  
عبد الله علي الملاهي
Keyword(s):  
Corporate Governance ◽  
Central Bank ◽  
Financial Markets ◽  
Analytical Method ◽  
Analytical Approach ◽  
Central Banks ◽  
Islamic Banks ◽  
Comparison Study ◽  
Governance System

أصبحت الحوكمة إحدى الركائز الأساسية التي يجب على جميع الوحدات الاقتصادية أن تطبق مبادئها ومعاييرها وذلك للحد من تعرض الشركات والبنوك للفشل المالي. تهدف هذه الدراسة لتوضح الاختلافات الأساسية بين تعليمات الحوكمة الصادرة من مصرف قطر المركزي وتعليمات الحوكمة الصادرة من هيئة قطر للأسواق المالية، وذلك من خلال بيان مفهوم الحوكمة وإطارها التشريعي والتاريخي، وأبرز السلطات الرقابية والإشرافية العالمية والإسلامية التي اهتمت وأصدرت معايير للحوكمة، ثم ناقشت المعايير الصادرة من أبرز سلطتين رقابيتين في قطر وهما مصرف قطر المركزي وهيئة قطر للأسواق المالية، والفرق بينهما وأيهما أولى بالتطبيق من قبل المصارف القطرية سواء الإسلامية أو التقليدية، واتبع الباحثون المنهج الوصفي من خلال دراسة الإطار النظري للدراسة، وتوضيح الاختلافات الأساسية من خلال المقارنة النظرية بين مبادئ الحوكمة للسلطات الرقابية والإشرافية القطرية، ونتج عن الدراسة أن هناك وجود فروق أساسية فيما يخص المصارف وأن تعليمات مصرف قطر أولى بالتطبيق بالنسبة للمصارف. الكلمات المفتاحيّة: الحوكمة، مصرف قطر المركزي، تعليمات الحوكمة، هيئة قطر للأسواق المالية، نظام الحوكمة. Abstract This study aims to clarify the Fundamental differences between Governance instructions issued by Qatar Central Bank and Governance System issued by Qatar Financial Markets Authority. Moreover, concept of corporate governance, legislative and historical framework, most important supervisory authorities whether global, Islamic or in Qatar are discuss. Then, it discusses the main differences between standards which issued by Qatar Central Bank and Qatar Financial Markets Authority, and whichever is Islamic Banks in Qatar should apply their Standards. The researcher used the descriptive analytical method to address the main principals. The analytical approach was also used by analyze the Governance instructions issued by Qatar Central Bank and Governance System issued by Qatar Financial Markets Authority. The result of the study, there are basic differences with regard to banks, and that Qatar Bank’s instructions are first to be applied with regard to banks. Keywords: Corporate Governance, Qatar Central Banks, Governance Instructions, Qatar Financial Markets Authority, Governance System.

scholarly journals « Le tableau vivant » ou sur l’intermédialité au théâtre

Symbolon ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 217-226
Author(s):  
Sorin Crișan
Keyword(s):  
Analytical Approach ◽  
Structural Elements ◽  
Multiple Meanings ◽  
Tableau Vivant

Intermediality, as an act which is necessarily an extension of what we might call inter-arts, makes theatre reconfigure not only its status, but also its structural elements. Thus, the presence becomes a theme which is impossible to be avoided in the analytical approach of theatre. It is the presence that is led in the direction of integrating the multiple meanings of those media that are on same level with the dedicated theater art. Our study will try to point out some elements that make intermediality transform the theatrical into a “composition” with paradoxical meanings and significances.

An Exact Analytical Approach for Free Vibration Analysis of Built-Up Space Frames

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
C. Mei ◽  
H. Sha
Keyword(s):  
Free Vibration ◽  
Analytical Approach ◽  
Free Vibration Analysis ◽  
Structural Elements ◽  
Space Frames ◽  
Out Of Plane ◽  
Vibration Responses ◽  
Numerical Tools ◽  
Classical Vibration ◽  
Exact Analytical Method

Coupled in- and out-of-plane bending, axial, and torsional vibrations exist in a built-up space frame, which greatly challenges the conventional modal approach. A wave-based exact analytical method is applied to study vibrations in built-up multistory space frames. From the wave vibration standpoint, vibrations are described as waves propagating along uniform structural elements and being reflected and transmitted at structural discontinuities. Free vibration responses are studied based on classical vibration theories. Numerical examples are given with comparison to results available in the literature. Good agreements have been reached. This study not only provides an exact analytical approach to complex vibration problems in built-up multistory space frames that have mostly been studied numerically but also provides a benchmark to existing numerical tools.

A Hybrid Finite Element-Analytical Approach for Dynamic Analysis of a Micro-Resonator Driven by Electrostatic Combs

2012 ◽  
Vol 226-228 ◽  
pp. 708-713
Author(s):  
Mi Tao Song ◽  
Deng Qing Cao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Differential Equations ◽  
Nonlinear Dynamic ◽  
Analytical Approach ◽  
Dynamic Responses ◽  
The Finite Element Method ◽  
Global Mode ◽  
Hybrid Finite Element ◽  
Micro Resonator

Combining the finite element method and the analytical method, a hybrid finite element-analytical approach is established to calculate the nonlinear dynamic responses of a micro-resonator driven by electrostatic combs accurately for the purpose of programmed dynamical simulations and great shortening of workloads. The spatially discretized equations obtained by using the analytical undamped global mode functions to the nonlinear integro-partial differential equations and the ordinary differential equations of the micro-resonator, in which the coefficients are estimated by the discrete global mode shapes from the finite element method, are used to calculate the nonlinear dynamic responses of the micro-resonator. The results are compared with those merely based on the analytical mode functions of the micro-resonator, which shows that they can reach high accuracy when the elements in the micro-resonator are sufficiently small.

A new analytical approach to predicting cycle-slipping in charge pump PLLs

2013 ◽  
Vol 33 (1/2) ◽  
pp. 527-539
Author(s):  
Vahideh Sadat Sadeghi ◽  
Hossein Miar Naimi
Keyword(s):  
Analytical Method ◽  
Analytical Approach ◽  
Good Accuracy ◽  
Charge Pump ◽  
Phase Locked Loops ◽  
Full Time ◽  
Input Frequency ◽  
Content Type ◽  
The Time Domain

Purpose – The linear analysis presented for the charge pump phase locked loops (CPPLLs) becomes inaccurate or incorrect where cycle slipping occurs. In this paper, an analytical approach is proposed, which explains the conditions in which cycle slipping happens. Using the analytical results, one can simply design or redesign a CPPLL to prevent or decrease cycle slipping and hence decreasing the locking time. The paper aims to discuss these issues. Design/methodology/approach – To obtain cycle slipping conditions, CPPLL's signals in the time domain are tracked and cycle slipping condition is investigated. Based on the proposed analysis, by comparing a simple function of system's parameters with a threshold, cycle slipping is predicted. Findings – The cycle slipping conditions are expressed in terms of system's parameters and the size of the input frequency step. The method is also generalized for a fast CPPLL with an aid-lock BBFC circuit. The good accuracy of the analytical predictions is verified using simulations in Matlab/Simulink. Originality/value – A new analytical method for cycle slipping prediction in CPPLLs is presented. A closed form equation in terms of system's parameters and input frequency step has been presented, which can predict the cycle slipping possibility in the system without a need to perform the full time-consuming simulations. This analytical method that uses the LambertW function's properties proposes a threshold to predict cycle slipping in the system. This method not only can be used by designers to predict cycle slipping but can also be used to design the CPPLL in order to remove or decrease cycle slipping. The method is also generalized for fast locking charge pump PLLs and as a case study, cycle slipping prediction in the BBFC-CPPLL is performed.

An Analytical Approach to the Extrusion Pressure of Bimetallic Tube

2010 ◽  
Vol 443 ◽  
pp. 87-92
Author(s):  
Guo Liang Xie ◽  
Jing Liu ◽  
Jing Tao Han ◽  
Pei Jie Yan
Keyword(s):  
Mechanical Properties ◽  
Energy Conservation ◽  
Analytical Method ◽  
Analytical Approach ◽  
Metal Flow ◽  
Extrusion Process ◽  
Extrusion Pressure ◽  
Bimetallic Tube ◽  
Good Agreement

In this paper, the extrusion process of bimetallic tubes is discussed, and the extrusion pressure is calculated based on the method of energy conservation, according to the three categories of metal flow that may occur during the process. A number of parameters, geometry of bimetallic tube, mechanical properties of material components and friction conditions, are highlighted in this analytical method. Compared with the data of TP304l/20G bimetallic tubes which were extruded at 1100-1200 °C, the calculated results show a good agreement with the industrial results, with the error less than 10 %. It also proves that the friction between the two layers play an important role in the process.

scholarly journals Analytical Approach for Orbital Evasion with Space Geometry Considered

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Dateng Yu ◽  
Hua Wang ◽  
Shuai Guo ◽  
Hongyu Wang
Keyword(s):  
Analytical Solution ◽  
Analytical Method ◽  
Optimization Model ◽  
Analytical Approach ◽  
Measuring Time ◽  
Angle Measurements ◽  
Space Geometry ◽  
Evasion Problem ◽  
Reference Measurements ◽  
Definition Of

This paper researches an optimal problem of orbital evasion with considering space geometry by using an analytical approach. Firstly, an angles-only relative navigation model is built and the definition of completely nonobservable maneuver is proposed. After algebraic analysis of relative space geometry, it is proved that the completely nonobservable maneuver is nonexistent. Based on this, the angle measurements of orbit without evasion are set as reference measurements and an analytical solution is derived to find the minimum difference between measurements and the reference measurements in a constant measuring time. Then, an object function using vector multiplication is designed and an optimization model is established so as to prove the optimality of analytical solution. At last, several numerical simulations are performed with different maneuver directions, which verify the effectiveness of the analytical method of this paper for orbital evasion problem. This method offers a new viewpoint for orbital evasion problem.

Semi-analytical approach to transport gaps in polycrystalline graphene

Nanoscale ◽  
2021 ◽  
Author(s):  
Delwin Perera ◽  
Jochen Rohrer
Keyword(s):  
Analytical Method ◽  
Analytical Approach ◽  
Transport Gaps

We present a semi-analytical method to calculate strain-induced transport gap modulations in graphene polycrystals. Our method uses a physically intuitive picture of grain-to-grain transport via Dirac cones avoiding explicit transport calculations.

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