Case Study: Regulation of Noise Produced by a Rotary-screw Propulsion Unit in an All-terrain Vehicle

2020 ◽  
Author(s):  
Umar Vahidov ◽  
Alexander Belyaev ◽  
Vladimir Makarov ◽  
Dmitriy Mokerov ◽  
Yuri Molev
Keyword(s):  
Propulsion Unit ◽  
Rotary Screw

Case study of the effects on coal seam gas well production with installation of well head compression (oil-flooded rotary screw type): early outcomes of an Australian trial of four wells in the Bowen Basin

2017 ◽  
Vol 57 (2) ◽  
pp. 629
Author(s):  
Terrance Presley ◽  
Evilia Kurnia ◽  
Basia Wronski
Keyword(s):  
Coal Seam ◽  
Gas Flow ◽  
Lower Surface ◽  
Gas Production ◽  
Coal Seam Gas ◽  
Potential Wells ◽  
Energy Field ◽  
Operational Issues ◽  
Rotary Screw

This paper discusses the early outcomes of a trial of well head compression on coal seam gas (CSG) wells to lower surface pressure at the well head. This is a case study of four Johnson Controls Frick rotary screw compressor packages that were installed on CSG wells in an Origin Energy field in the Bowen basin and the early effects of lower well pressures on increased gas production due to the installation of compression. In mid-2016 Johnson Controls installed four compressor packages on Origin Energy wells with different characteristics (age, flow pressure), with a view of determining uplift of gas flow over the remaining life of the well, as well as operational issues with having well head compression. The expected versus actual uplift is compared for the different wells, with a view of providing some guidance on future potential wells that will benefit from this type of compression. Operational issues, such as effects on water flow, effect of oil and overall design considerations for well head compression, are also discussed.

scholarly journals Sound power spectra modelling of the vehicle in motion equipped with rotary-screw propulsion unit

2019 ◽  
Vol 1177 ◽  
pp. 012034
Author(s):  
Y Molev ◽  
D Mokerov ◽  
S Ivanov ◽  
M Saushkina ◽  
Y Palutin
Keyword(s):  
Power Spectra ◽  
Sound Power ◽  
Propulsion Unit ◽  
Rotary Screw

Design and structural analysis of a thrust chamber for a spinning supersonic rocket – a case study

2005 ◽  
Vol 109 (1094) ◽  
pp. I-VI ◽  
Author(s):  
K. M. Rajan ◽  
K. Narasimhan
Keyword(s):  
Mechanical Properties ◽  
Structural Analysis ◽  
Factor Of Safety ◽  
Flight Vehicle ◽  
Structural Dynamic ◽  
Aerodynamic Loads ◽  
Rocket Propulsion ◽  
Thrust Chamber ◽  
Propulsion Unit

Abstract The design of a thrust chamber for a rocket propulsion system is a challenging task. The thrust chamber has to be designed for minimum structural weight with an adequate factor of safety. This calls for a thorough knowledge of various structural loads, both internal and external, and the behaviour of the structure in flight. This paper presents the design and structural analysis of a pressure vessel used as thrust chamber for a rocket propulsion unit. The effects of kinetic heating, thermal stress, spinning and various aerodynamic loads and their mutual interactions are accounted for in this analysis. Based on a detailed stress analysis of the components and a modal/structural dynamic analysis of the flight vehicle as a whole, in which the thrust chamber is the main load bearing member, the required mechanical properties of the thrust chamber are obtained.

scholarly journals Modelling of vehicles with rotary-screw propulsion unit along water-flooded substructure

2019 ◽  
Vol 1177 ◽  
pp. 012039
Author(s):  
A Strizhak ◽  
U Vakhidov ◽  
A Lipin ◽  
R Dorofeev ◽  
A V Sogin ◽  
...  
Keyword(s):  
Propulsion Unit ◽  
Rotary Screw

Magnitude and Causes of Smolt Mortality in Rotary Screw Traps: An Atlantic Salmon Case Study

2010 ◽  
Vol 30 (3) ◽  
pp. 713-722 ◽  
Author(s):  
Paul A. Music ◽  
James P. Hawkes ◽  
Michael S. Cooperman
Keyword(s):  
Atlantic Salmon ◽  
Rotary Screw

scholarly journals Sound Generation under Rotary-Screw Propulsion Unit Base Cylinder Bending

2019 ◽  
Vol 695 ◽  
pp. 012027
Author(s):  
I. A. Erasov ◽  
I.G. Kuklina ◽  
Y.I. Molev ◽  
D.S. Mokerov ◽  
T.G. Skrebneva
Keyword(s):  
Sound Generation ◽  
Propulsion Unit ◽  
Rotary Screw

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

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