scholarly journals Discharge coefficient for rectangular notch using a dimensional analysis technique

2018 ◽  
Vol 433 ◽  
pp. 012015
Author(s):  
H H Alwan ◽  
F M Al-Mohammed
Keyword(s):  
Dimensional Analysis ◽  
Discharge Coefficient ◽  
Analysis Technique ◽  
Rectangular Notch

Effect of the lifetime of the intermediate 5Li state in the 6Li(3He, αp)4He reaction

1968 ◽  
Vol 46 (20) ◽  
pp. 2241-2251 ◽  
Author(s):  
M. A. Reimann ◽  
P. W. Martin ◽  
E. W. Vogt
Keyword(s):  
Dimensional Analysis ◽  
Energy Dependence ◽  
Ground State ◽  
Intermediate State ◽  
Two Dimensional ◽  
Short Life ◽  
Semiclassical Model ◽  
Analysis Technique ◽  
The Asymmetry

A cylindrical asymmetry about the direction of motion of 5Li has been seen in the breakup of the ground state of this nucleus observed as an intermediate state in the reaction 6Li(3He, pα)4He. Measurements were made at bombarding energies of 1.00, 1.25, and 1.50 MeV with isotopically enriched LiF targets using a two-dimensional analysis technique. We explain both the rough magnitude of the asymmetry and its qualitative energy dependence in terms of a simple semiclassical model. In this model the origin of the asymmetry is associated with the short life of the 5Li intermediate state and with the memory retained by the proton during this short life of its "localization" at the time of formation of 5Li.

Global Local Finite Element Method (GLFEM) in Gear Tooth Stress Analysis

1993 ◽  
Vol 115 (4) ◽  
pp. 1008-1012 ◽  
Author(s):  
I. Moriwaki ◽  
T. Fukuda ◽  
Y. Watabe ◽  
K. Saito
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Dimensional Analysis ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Critical Section ◽  
Energy Principle ◽  
Analysis Technique ◽  
Element Method

The present study is concerned with an application of the global local finite element method (GLFEM) to a gear tooth stress analysis. The GLFEM is a numerical analysis technique which combines finite element solutions and classical analytical ones on the basis of the energy principle. In this method, the classical analytical solutions give an almost exact stress field to the elements in which the stress varies very rapidly and/or the stress concentration is found. A fine subdivision, therefore, is not required. In the application of the conventional finite element method to the gear tooth stress analysis, the fine subdivision is required especially at the positions near tooth bottom and the load applied point. Hence, only two-dimensional analysis is available for common use. Furthermore, in order to determine an exact location of a critical section on which a fillet stress is maximum, we must use complicated procedures, e.g., an iteration of subdivision for searching the maximum nodal stress. In the present paper, the GLFEM is applied to the gear tooth stress analysis to show that even the rough subdivision enables us to make the precise three-dimensional analysis. It also guarantees an easy determination of the critical section. Thus, we show the effective future of the GLFEM to the gear tooth stress analysis.

Global Local Finite Element Method (GLFEM) in Gear Tooth Stress Analysis

1992 ◽  
Author(s):  
I. Moriwaki ◽  
T. Fukuda ◽  
Y. Watabe ◽  
K. Saito
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Dimensional Analysis ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Critical Section ◽  
Energy Principle ◽  
Analysis Technique ◽  
Element Method

Abstract The present study is concerned with an application of the Global Local Finite Element Method (GLFEM) to a gear tooth stress analysis. The GLFEM is a numerical analysis technique which combines finite element solutions and classical analytical ones on the basis of the energy principle. In this method, the classical analytical solutions give an almost exact stress field to the elements in which the stress varies very rapidly and/or the stress concentration is found. A fine subdivision, therefore, is not required. In the application of the conventional finite element method to the gear tooth stress analysis, the fine subdivision is required especially at the positions near tooth bottom and the load applied point. Hence, only two dimensional analysis is available for common use. Furthermore, in order to determine an exact location of a critical section on which a fillet stress is maximum, we must use complicated procedures, e.g. an iteration of subdivision for searching the maximum nodal stress. In the present paper, the GLFEM is applied to the gear tooth stress analysis to show that even the rough subdivision enables us to make the precise three dimensional analysis. It also guarantees an easy determination of the critical section. Thus, we show the effective future of the GLFEM to the gear tooth stress analysis.

A simple method to design and analyze dynamic vibration absorber using dimensional analysis

2020 ◽  
pp. 107754632092392
Author(s):  
Mahdi Karimi ◽  
Mehrdad Shemshadi ◽  
Naghmeh Firoozfam
Keyword(s):  
Dimensional Analysis ◽  
Numerical Solutions ◽  
Vibration Absorber ◽  
Linear Regression Method ◽  
Vibration Absorbers ◽  
Dynamic Vibration Absorber ◽  
Simple Method ◽  
Dynamic Vibration ◽  
Analysis Technique ◽  
Mass Spring

Addition of mass, spring, and damper as a dynamic vibration absorber to a structure that is vibrating out of the permissible vibration range can be an economic and applicable solution to reduce structure vibrations provided that the absorber is designed and adjusted properly. In practice, real structures are damped, which can make it impossible to design vibration absorbers without using numerical solutions and complicated calculations. Using dimensional analysis technique and data obtained from system simulation by MATLAB Simulink, this study aims to provide simple and reliable correlations for designing and analyzing vibration absorbers. For this purpose, the motion equations of a one-degree-of-freedom system with a vibration absorber and a harmonic force applied is simulated. Use of a set of simulation output data to minimize the maximum motion amplitude of the structure along with multiple linear regression method enables determination of unknown coefficients of the correlations derived from dimensional analysis. Studies show that mass ratio and stiffness ratio are important for designing vibration absorbers for undamped and damped structures, respectively. The correlations are validated using the methods introduced in previous studies. Also, an example of vibration absorbers is calculated for an air compressor. The vibration absorber designed by this methodology results in a reduction in the magnification factor of the compressor by 78%.

scholarly journals SWOT DIMENSIONAL ANALYSIS FOR STRATEGIC PLANNING – THE CASE OF OVERSEAS REAL ESTATE DEVELOPERS IN GUANGZHOU, CHINA / STRATEGINIO PLANAVIMO LYGINAMOJI SSGG ANALIZĖ – UŽSIENIO NEKILNOJAMOJO TURTO PLĖTOTOJŲ GUANGŽOU (KINIJA) ATVEJIS

2011 ◽  
Vol 15 (2) ◽  
pp. 105-122 ◽  
Author(s):  
Barbara Y. P. Leung ◽  
Eddie C. M. Hui ◽  
Jian-hui Tan ◽  
Lin Chen ◽  
Wei-bin Xu
Keyword(s):  
Strategic Planning ◽  
Real Estate ◽  
Dimensional Analysis ◽  
Real Estate Market ◽  
Open Door ◽  
Open Door Policy ◽  
Holistic Model ◽  
Analysis Technique ◽  
Real Estate Developers ◽  
Economic Partnership

China has been attracting overseas real estate developers (OREDs) with its expanding real estate market since the adoption of the Open Door Policy. This attractiveness has been enhanced by China's accession to the World Trade Organization and the Closer Economic Partnership Arrangement and is likely to remain for the foreseeable future. However, OREDs to conduct developments in China which adopts a socialist market-oriented approach is not without difficulties. The study has developed a SWOT dimensional analysis technique which is able to integrate the strengths and weaknesses of OREDs and also the opportunities and threats found in the market for formulating their (s)trategic plans and market positions. Apart from proposing a holistic model for OREDs’ strategic planning, the findings also suggested that OREDs in Guangzhou are in general strong in management and financial capacity but weak in understanding the market conditions. Building up a localized management team which understands the market and has good connection with local officials and business peoplė is of prime concerns. Santrauka Patvirtinus atvirų durų politiką (angl. Open Door Policy), besiplečianti Kinijos nekilnojamojo turto rinka pritraukia vis daugiau užsienio nekilnojamojo turto plėtotojų (angl. OREDs). Toks jos patrauklumas išaugo Kinijai įstojus į PPO ir įgijus glaudesnės ekonominės partnerystės statusą (angl. Closer Economic Partnership Arrangement), be to, numatoma, kad artimiausiu metu jis niekur neišnyks. Tačiau užsienio nekilnojamojo turto plėtotojai, vykdantys plėtrą Kinijoje, kurioje taikomas socialistinis, į rinką orientuotas požiūris, susiduria su sunkumais. Tyrimo metu buvo sukurtas lyginamosios SSGG analizės metodas, leidžiantis integruoti užsienio nekilnojamojo turto plėtros specialistų stiprybes ir silpnybes bei aptiktas rinkoje galimybes ir grėsmes, kurios padės suformuluoti strateginius jų planus ir rinkos pozicijas. Be pasiūlyto holistinio modelio užsienio nekilnojamojo turto plėtotojų strateginiam planavimui, rezultatai rodo, kad užsienio nekilnojamojo turto plėtotojai Guangžou užima stiprią poziciją finansų ir valdymo srityje, tačiau silpnai orientuojasi rinkos sąlygomis. Būtina laikytis esminės koncepcijos – sukurti lokalią valdymo komandą, gerai besiorientuojančią rinkoje ir palaikančią gerus santykius su vietos valdžia ir verslininkais.

Experimental study of one- and two-cycle trapezoidal piano-key side weirs in a curved channel

2019 ◽  
Vol 19 (6) ◽  
pp. 1597-1603 ◽  
Author(s):  
Abolfazl Saghari ◽  
Mojtaba Saneie ◽  
Khosrow Hosseini
Keyword(s):  
Experimental Study ◽  
Dimensional Analysis ◽  
Discharge Capacity ◽  
Discharge Coefficient ◽  
Empirical Equation ◽  
Measured Data ◽  
Total Width ◽  
Curved Channel ◽  
Side Weirs ◽  
Good Agreement

Abstract Piano-key weirs can be used instead of classic rectangular side-weirs (CRSWs) to increase the discharge capacity of side weirs. So far, no research has been done on trapezoidal piano-key side weirs (TPKSWs) in a curved channel. This study examines the effect of using one or two cycles in TPKSWs on discharge capacity, having the same total width and upstream–downstream length. Dimensional analysis has been performed to determine the dimensionless parameters affecting the discharge coefficient related to the developed length (CdL) of TPKSWs in a curved channel. An empirical equation for CdL has been proposed based on the experimental results. There is a good agreement between estimated and measured data. Results showed that the discharge coefficient related to the total width of a TPKSW is 1.7 to 5.6 times higher than that of a CRSW. Also, the CdL of a one-cycle TPKSW is 1.4 to 2 times higher than that of a two-cycle TPKSW.

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