scholarly journals SIMPLIFIED METHOD FOR EVALUATION OF THE SPEED CHANGE ON MIXTURE FORMATION OF DIFFERENT LIQUIDS PUMPED BY BATCHING METHOD

2018 ◽  
pp. 34-40
Author(s):  
М. D. Serediuk
Keyword(s):  
Petroleum Products ◽  
Terminal Point ◽  
Mixture Formation ◽  
Linear Speed ◽  
Mixing Intensity ◽  
Simplified Method ◽  
Non Linear ◽  
Speed Change

A simplified method that allows considering the influence of linear and non-linear speed change on the mixing intensity of different oil or petroleum products in the process of sequential pumping was developed. The calculation formulas for distribution of concentrations of liquids along the length of the mixture zone, for its volume and expansion at the pipeline terminal point were proposed.'

Angular resampling for vibration analysis in wind turbines under non-linear speed fluctuation

2011 ◽  
Vol 25 (6) ◽  
pp. 2157-2168 ◽  
Author(s):  
Luisa F. Villa ◽  
Aníbal Reñones ◽  
Jose R. Perán ◽  
Luis J. de Miguel
Keyword(s):  
Wind Turbines ◽  
Vibration Analysis ◽  
Linear Speed ◽  
Non Linear ◽  
Speed Fluctuation

Adaptive non-linear speed control of induction motors

1993 ◽  
Vol 7 (5) ◽  
pp. 435-455 ◽  
Author(s):  
Thomas Von Raumer ◽  
Jean Michel Dion ◽  
Luc Dugard
Keyword(s):  
Induction Motors ◽  
Speed Control ◽  
Linear Speed ◽  
Non Linear

scholarly journals Evaporation flow assessment from petroleum product storage tanks exposed to fire conditions

2018 ◽  
Vol 73 ◽  
pp. 27 ◽  
Author(s):  
S. Ginestet ◽  
C. Le Bot
Keyword(s):  
Petroleum Product ◽  
Storage Tank ◽  
Numerical Approach ◽  
Petroleum Products ◽  
Storage Device ◽  
Storage Tanks ◽  
Exact Answer ◽  
Simplified Method ◽  
Product Storage

Fire around storage tanks for petroleum products can have disastrous consequences for the environment and the population. These fires, due to accident or arson, are very well managed by security divisions but, nevertheless, involve the release of an amount of vapour from the petroleum present in the storage device. The exposure of a non-refrigerated aboveground liquid petroleum or petroleum product storage tank to fire can also lead to internal overpressure. PV-valves ensure that the normal and emergency venting requirements are satisfied, and determination of such requirements is key for the safety of petroleum tanks and should not be underestimated. This paper presents and discusses some methods that can be used to evaluate the vapour flow. In the aim of finding an exact answer rapidly, a thermal analytical approach is first investigated, which reveals the complexity of the solution. Thus, a numerical approach, based on finite-volume description, is used to set the first steps of the flow assessment. Based on a thermodynamic hypothesis, a simplified method is finally put forward for the evaluation of the amount of vapour released. The algorithm used to determine how temperature, pressure and flow evolve over time, which is very useful information for the safety of these devices, is then detailed and the results discussed.

scholarly journals Lower-Body Power Relationships to Linear Speed, Change-of-Direction Speed, and High-Intensity Running Performance in DI Collegiate Women’s Basketball Players

2019 ◽  
Vol 68 (1) ◽  
pp. 223-232
Author(s):  
Daveena S. Banda ◽  
Maria M. Beitzel ◽  
Joseph D. Kammerer ◽  
Isaac Salazar ◽  
Robert G. Lockie
Keyword(s):  
Body Mass ◽  
High Intensity ◽  
Vertical Jump ◽  
Power Relationships ◽  
Lower Body ◽  
Basketball Players ◽  
Linear Speed ◽  
Change Of Direction ◽  
Speed Change ◽  
Lower Body Power

AbstractBasketball players need to sprint and change direction, and lower-body power (often measured by jump tests) should contribute. How different jumps relate to linear and change-of-direction (COD) speed, and high-intensity running has not been analyzed in Division I (DI) collegiate women’s basketballers. Twelve players completed the vertical jump (VJ), two-step approach jump (AppJ), and standing broad jump (SBJ). Average (AvgP) and peak power (PeakP), and PeakP: body mass (P:BM) were derived from VJ height; relative SBJ was derived from SBJ distance. Players also completed: 10 m and ¾ court sprints (linear speed), the pro-agility shuttle (COD speed), and the Yo-Yo Intermittent Recovery Test Level 1 (YYIRT1; high-intensity running). Pearson’s correlations (p < 0.05) calculated relationships between the jump and running tests. The AppJ correlated to the ¾ court sprint and pro-agility shuttle (r = -.663 to -.805). AvgP and PeakP correlated to the 10 m sprint, ¾ court sprint, and pro-agility shuttle (r = .589-.766). P:BM and relative SBJ correlated with all running tests (linear and COD speed r = -.620 to -.805; YYIRT1 r = .622.803). The AppJ stresses the stretch-shortening capacities of the legs, and this quality is important for faster linear and COD speed. AvgP and PeakP are influenced by body mass; while larger athletes produce greater power, they also may display slower 10 m sprint and pro-agility shuttle times, and lesser YYIRT1 performance. Strength coaches should ensure players can generate high relative power (i.e. P:BM, relative SBJ) for faster linear and COD speed, and high-intensity running.

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