Usage of the Lund Rotordynamic Programs in the Analysis of Centrifugal Compressors

2003 ◽  
Author(s):  
Edmund A. Memmott
Keyword(s):  
Rotor Dynamics ◽  
Centrifugal Compressors ◽  
Acceptance Criterion ◽  
Trouble Shooting ◽  
Wide Acceptance ◽  
History Of ◽  
Audit Reports

This paper is intended to be a history of the usage of the Jorgen Lund rotordynamic programs in the analysis of centrifugal compressors from the perspective of the author’s experience in that industry. Application of the Lund tilt pad bearing, rotor response, and stability programs will be described. They will be seen to be the basis for an industry wide acceptance criterion for the rotor dynamics of centrifugal compressors. They are used in the required audit reports for new compressors, and in trouble shooting investigations on the rotordynamics of centrifugal compressors.

Usage of the Lund Rotordynamic Programs in the Analysis of Centrifugal Compressors

2003 ◽  
Vol 125 (4) ◽  
pp. 500-506 ◽  
Author(s):  
Edmund A. Memmott
Keyword(s):  
Rotor Dynamics ◽  
Centrifugal Compressors ◽  
Acceptance Criterion ◽  
Trouble Shooting ◽  
Wide Acceptance ◽  
History Of ◽  
Audit Reports

This paper is intended to be a history of the usage of the Jørgen Lund rotordynamic programs in the analysis of centrifugal compressors from the perspective of the author’s experience in that industry. Application of the Lund tilt pad bearing, rotor response, and stability programs will be described. They will be seen to be the basis for an industry wide acceptance criterion for the rotor dynamics of centrifugal compressors. They are used in the required audit reports for new compressors, and in trouble shooting investigations on the rotordynamics of centrifugal compressors.

New Light on the Career of Nuño Beltrán de Guzmán

1963 ◽  
Vol 19 (4) ◽  
pp. 341-348 ◽  
Author(s):  
Donald E. Chipman
Keyword(s):  
Sixteenth Century ◽  
New Spain ◽  
Early History ◽  
Wide Acceptance ◽  
Before And After ◽  
History Of ◽  
Spanish Archives ◽  
Hernan Cortes

It is a notable fact that Nuño Beltrán de Guzman, whom many regard as second only in importance to Hernán Cortés in the early history of New Spain, should have escaped for so long the detailed attention of historians. Because of this neglect several false notions have gained currency. For instance, it has been customarily assumed that a Nuño de Guzmán, encomendero of Puerto Plata, Española, was the man who became governor of Panuco, president of the First Audiencia of New Spain, and governor of New Galicia; and wide acceptance has been given to the belief that the man who held these important positions in New Spain died a lonely, despised man in the royal prison of Torrejón de Velasco. Recent investigations by the author in the Spanish archives of Sevilla, Madrid, Guadalajara, and Simancas strongly suggest that the Nuño de Guzmán of Puerto Plata was not the same as the more famous Nuño Beltrán de Guzmán of Guadalajara, Spain, who held three important positions in sixteenth-century New Spain. This research has also lent new insights into the life of Nuño de Guzmán of Guadalajara before and after his career in the Indies.

Fan/Foundation Interaction—A Simplified Calculation Procedure

1981 ◽  
Vol 103 (4) ◽  
pp. 805-810
Author(s):  
H. M. Chen ◽  
S. B. Malanoski
Keyword(s):  
Dynamic System ◽  
Equations Of Motion ◽  
Rotor Dynamics ◽  
Analysis Procedure ◽  
Initial Assessment ◽  
Design Decision ◽  
Foundation Soil ◽  
Trouble Shooting ◽  
Modes Of Vibration ◽  
Simplified Calculation

This paper presents a simplified analysis procedure to provide initial assessment and guidance on fan rotor dynamics including the foundation interaction. For purposes of early-design decision-making (or trouble-shooting), the interaction of a rotor-bearing dynamic system and a foundation-soil/piling dynamic system is viewed approximately for the vertical, horizontal, and rocking modes of vibration. The equations of motion are written in matrix form and include the pertinent parameters. A numerical example is presented to guide in the interpretation of the analysis; this example considers the unbalance response of the entire system as measured at the bearings.

The “Chiliasm of Despair” Reconsidered: Revivalism and Working-Class Agitation in County Durham

1989 ◽  
Vol 28 (1) ◽  
pp. 23-42 ◽  
Author(s):  
J. A. Jaffe
Keyword(s):  
Nineteenth Century ◽  
Working Class ◽  
Social History ◽  
Early Nineteenth Century ◽  
Wide Acceptance ◽  
The Social ◽  
History Of ◽  
The One ◽  
Political Radicalism

The role of evangelical religion in the social history of the English working class has been an area of both bewildering theories and un-founded generalizations. The problem, of course, was given a degree of notoriety by Elie Halévy who, according to the received interpretation, claimed that the revolutionary fervor characteristic of the Continental working class in the first half of the nineteenth century was drained from its British counterpart because of the latter's acceptance of Evangelicalism, namely, Methodism.It was revived most notably by E. P. Thompson, who accepted the counterrevolutionary effect of Methodism but claimed that the evangelical message was really an agent of capitalist domination acting to subordinate the industrial working class to the dominion of factory time and work discipline. Furthermore, Thompson argued, the English working class only accepted Methodism reluctantly and in the aftermath of actual political defeats that marked their social and economic subordination to capital. This view has gained a wide acceptance among many of the most prominent labor historians, including E. J. Hobsbawm and George Rudé who believe that Evangelicalism was the working-class's “chiliasm of despair” that “offered the one-time labour militant … compensation for temporal defeats.”There could hardly be a starker contrast between the interpretation of these labor historians and the views of those who have examined the social and political history of religion in early industrial Britain. Among the most important of these, W. R. Ward has claimed that Methodism was popular among the laboring classes of the early nineteenth century precisely because it complemented political radicalism.

A Brief History of Rotor Dynamics

1992 ◽  
pp. 1-10 ◽  
Author(s):  
A. D. Dimarogonas
Keyword(s):  
Rotor Dynamics ◽  
History Of

Rotordynamic Instability in Centrifugal Compressors: Are All the Excitations Understood?

1980 ◽  
Author(s):  
J. M. Vance ◽  
F. J. Laudadio
Keyword(s):  
Journal Bearing ◽  
Working Fluid ◽  
Experimental Measurements ◽  
Simple Test ◽  
Test Rig ◽  
Centrifugal Compressors ◽  
Damping Coefficients ◽  
Stiffness Coefficients ◽  
History Of ◽  
Stiffness And Damping

A published history of rotordynamic instability problems with centrifugal compressors is documented from the literature. Established theory for computerized stability anaylysis is reviewed, and the use of cross-coupled stiffness and damping coefficients to represent destabilizing forces is explained. A derivation of cross-coupled stiffness coefficients for torquewhirl is presented. Experimental measurements made on a simple test rig with a radial-vaned impeller are described, which show that a working fluid can exert destabilizing forces on such an impeller. These forces must be considered, in addition to journal bearing and internal hysteresis excitations, if accurate predictions of rotordynamic instability thresholds are to be made. Several classifications of these forces are hypothesized.

scholarly journals A short history of in vitro fertilization (IVF)

2019 ◽  
Vol 63 (3-4-5) ◽  
pp. 83-92 ◽  
Author(s):  
Martin H. Johnson
Keyword(s):  
In Vitro Fertilization ◽  
Short History ◽  
Vitro Fertilization ◽  
Wide Acceptance ◽  
The Usa ◽  
History Of ◽  
Restrictive Legislation

The history of in vitro fertilization (IVF) in humans from the early attempts in the USA through to the first definitive achievement of IVF by Edwards, Steptoe and Purdy (1969-1978), and the brief period of innovative IVF achievements to Melbourne, Australia, cut short by the passage of restrictive legislation (1979-1984) is recorded. A summary of the key achievements since the mid 1980s is then given. The shameful connotations of engaging in IVF of those esrly days is contrasted with its wide acceptance today, in which IVF is setting the norms for modern families.

scholarly journals The Role of Science in the History of Portuguese Anti-Jesuitism

2015 ◽  
Vol 2 (1) ◽  
pp. 77-99 ◽  
Author(s):  
Henrique Leitão ◽  
Francisco Malta Romeiras
Keyword(s):  
Twentieth Century ◽  
Eighteenth Century ◽  
The State ◽  
Society Of Jesus ◽  
Wide Acceptance ◽  
History Of

When dealing with the expulsion of the Jesuits from Portugal and with the building of anti-Jesuitism in the eighteenth century, historians usually focus on their alleged involvement in the attempt to murder king Dom José I and on the complex economical questions related with the foundation of the state trade company in Brazil. However, the Pombaline accusation of obscurantism and scientific illiteracy also played a central role in the history of anti-Jesuitism in Portugal, mainly due to its wide acceptance and longevity. This argument was not only directly relevant for the expulsion of the Jesuits in the eighteenth century but it was also a keystone of the anti-Jesuit propaganda that eventually led to the expulsion of the Society of Jesus from Portugal in the twentieth century.

History of Winder Technology and Recent Trouble Shooting References

2018 ◽  
Vol 72 (9) ◽  
pp. 997-1004
Author(s):  
Yasushi Tachikawa
Keyword(s):  
Trouble Shooting ◽  
History Of
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