Determination of excitation parameter limits for generator dynamic stability

1989 ◽  
Vol 72 (5) ◽  
pp. 357-362 ◽  
Author(s):  
C. D. Vournas ◽  
A. V. Machias ◽  
J. L. Souflis
Keyword(s):  
Dynamic Stability ◽  
Excitation Parameter

The Tightening Accuracy of Workpieces in the Multiple Clamping Devices

2014 ◽  
Vol 657 ◽  
pp. 524-528 ◽  
Author(s):  
Neculai Eugen Seghedin ◽  
Dragoş Florin Chitariu
Keyword(s):  
Dynamic Stability ◽  
Machine Tools ◽  
Machining Time ◽  
Number Of Components ◽  
The Subject

Fixtures are used for orientation-positioning-tightening of workpieces during machining on machine tools. Multiple clamping fixtures are intended to clamp several workpieces for simultaneous or successive machining. Multiple clamping is characterized by a series of economical advantages, due to the reduction of total machining time. These advantages are more important once the number of workpieces is higher or if the machining is made with compound tools. Due to the complexity, overall size and the high number of components, the multiple clamping fixtures have diminished accuracy than simple fixture due to elastic and contact deformations of fixtures housing, of supports etc. Also, multiple clamping fixtures present diminished rigidity and dynamic stability. From the analysis of the specialized literature results that there are a few paper on the subject of multiple clamping. In the paper there are presented the causes that can lead to the diminish of the accuracy of multiple fixture. The modalities for the determination of fixtures precision are presented, also, for the parallel and serial multiple clamping fixtures.

Determination of dynamic stability derivatives using forced oscillation technique

2002 ◽  
Author(s):  
N. Alemdaroglu ◽  
I. Iyigun ◽  
M. Altun ◽  
H. Uysal ◽  
F. Quagliotti ◽  
...  
Keyword(s):  
Dynamic Stability ◽  
Forced Oscillation ◽  
Forced Oscillation Technique ◽  
Stability Derivatives

Design Guidelines for Dynamic Stability of Tainter Gates

2017 ◽  
Author(s):  
Keiko Anami ◽  
Noriaki Ishii ◽  
Charles W. Knisely ◽  
Tatsuya Oku
Keyword(s):  
Dynamic Stability ◽  
Fem Analysis ◽  
Design Guidelines ◽  
Design Stage ◽  
Actual Structure ◽  
Analysis And Design ◽  
Coupled Mode ◽  
Excited Vibration ◽  
Vibration Tests

To ensure the long-term safe operation of newly constructed Tainter gates, methods of analysis and design criteria are needed in the design stage to assure the dynamic stability of any new Tainter gate. For this purpose, the present study provides a detailed procedure for the dynamic design of Tainter gates that can be applied to preliminary designs by gate engineers to assure the dynamic stability of their gate designs. The dynamic stability of the gate can be determined using the natural vibration characteristics ascertained by finite element method (FEM) analysis, reasonable values of actual structure damping actually measured by the field vibration tests, and theoretical analysis of the coupled-mode self-excited vibration that has been previously established by authors. The procedure and the important points of each step are detailed in an example determination of the dynamic stability of a practical Tainter gate.

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